import time
import requests

POLL_INTERVAL = 5 # in seconds

def start_polling(url):
    while True:
        response = requests.get(url)
        if response.status_code == 200:
            print("Received data:", response.text)
        else:
            print("Failed to retrieve data, status code:", response.status_code)
        time.sleep(POLL_INTERVAL)

if __name__ == "__main__":
    start_polling("http://www.example.com/data")

import asyncio
import websockets

async def echo(websocket, path):
    async for message in websocket:
        await websocket.send(message)

start_server = websockets.serve(echo, "localhost", 8765)

asyncio.get_event_loop().run_until_complete(start_server)
asyncio.get_event_loop().run_forever()

from flask import Flask, session
from flask_session import Session

app = Flask(__name__)
app.config['SESSION_TYPE'] = 'filesystem'
Session(app)

@app.route('/login')
def login():
    session['user_id'] = 12345
    session['token'] = 'abcdefghijklmnopqrstuvwxyz'
    session['expiration'] = time.time() + 3600 # expires in 1 hour
    return 'Session data set'

@app.route('/logout')
def logout():
    session.clear()
    return 'Session data cleared'

import pika

connection = pika.BlockingConnection(pika.ConnectionParameters(host='localhost'))
channel = connection.channel()

channel.exchange_declare(exchange='notifications', exchange_type='topic')

def send_notification(user_id, message):
    routing_key = 'user.' + str(user_id)
    channel.basic_publish(exchange='notifications', routing_key=routing_key, body=message)

send_notification(12345, 'Hello, user 12345!')

connection.close()

import mysql.connector

db = mysql.connector.connect(
  host="localhost",
  user="user",
  password="password",
  database="chat_db"
)

cursor = db.cursor()

def store_message(sender_id, recipient_id, message):
    sql = "INSERT INTO messages (sender_id, recipient_id, message) VALUES (%s, %s, %s)"
    val = (sender_id, recipient_id, message)
    cursor.execute(sql, val)
    db.commit()

store_message(12345, 56789, 'Hello, user 56789!')

db.close()

import flask
import requests

# Define a flask app for the user service
user_app = flask.Flask(__name__)

# Define a dictionary to store user information
users = {}

# Define an endpoint for creating a user
@user_app.route("/users", methods=["POST"])
def create_user():
    # Retrieve the user information from the request body
    user = flask.request.json

    # Store the user information
    user_id = len(users) + 1
    users[user_id] = user

    # Return the user ID
    return flask.jsonify({"user_id": user_id})

# Define a flask app for the message service
message_app = flask.Flask(__name__)

# Define a dictionary to store message information
messages = []

# Define an endpoint for creating a message
@message_app.route("/messages", methods=["POST"])
def create_message():
    # Retrieve the message information from the request body
    message = flask.request.json

    # Store the message information
    messages.append(message)

    # Notify the recipient of the new message
    user_id = message["to_user_id"]
    user = requests.get(f"http://localhost:5001/users/{user_id}").json()
    print(f"Sending message to {user['username']}: {message['text']}")

    # Return success
    return flask.jsonify({})

# Example usage
if __name__ == "__main__":
    user_app.run(port=5000)
    message_app.run(port=5001)

import java.util.*;

// User class represents a user in the system
class User {
    private String userId;
    private String username;
    // other user attributes
    
    public User(String userId, String username) {
        this.userId = userId;
        this.username = username;
        // initialize other attributes
    }
    
    // Getters and setters for attributes
    // ...
}

// Message class represents a message in the system
class Message {
    private String messageId;
    private String senderId;
    private String receiverId;
    private String content;
    private Date timestamp;
    // other message attributes
    
    public Message(String messageId, String senderId, String receiverId, String content) {
        this.messageId = messageId;
        this.senderId = senderId;
        this.receiverId = receiverId;
        this.content = content;
        this.timestamp = new Date();
        // initialize other attributes
    }
    
    // Getters and setters for attributes
    // ...
}

// MessengerService class handles messaging operations
class MessengerService {
    private Map<String, User> users;
    private List<Message> messages;
    
    public MessengerService() {
        this.users = new HashMap<>();
        this.messages = new ArrayList<>();
    }
    
    public void addUser(User user) {
        users.put(user.getUserId(), user);
    }
    
    public User getUserById(String userId) {
        return users.get(userId);
    }
    
    public void sendMessage(String senderId, String receiverId, String content) {
        User sender = getUserById(senderId);
        User receiver = getUserById(receiverId);
        
        if (sender == null || receiver == null) {
            System.out.println("User not found");
            return;
        }
        
        String messageId = UUID.randomUUID().toString();
        Message message = new Message(messageId, senderId, receiverId, content);
        messages.add(message);
        
        // Additional logic to handle real-time communication and notifications
        // ...
    }
    
    public List<Message> getMessagesByUserId(String userId) {
        List<Message> userMessages = new ArrayList<>();
        
        for (Message message : messages) {
            if (message.getSenderId().equals(userId) || message.getReceiverId().equals(userId)) {
                userMessages.add(message);
            }
        }
        
        return userMessages;
    }
    
    // Additional methods for managing conversations, notifications, etc.
    // ...
}

public class Main {
    public static void main(String[] args) {
        MessengerService messengerService = new MessengerService();
        
        User user1 = new User("1", "Alice");
        User user2 = new User("2", "Bob");
        
        messengerService.addUser(user1);
        messengerService.addUser(user2);
        
        messengerService.sendMessage("1", "2", "Hello, Bob!");
        
        List<Message> user1Messages = messengerService.getMessagesByUserId("1");
        for (Message message : user1Messages) {
            System.out.println("Sender: " + message.getSenderId());
            System.out.println("Receiver: " + message.getReceiverId());
            System.out.println("Content: " + message.getContent());
            System.out.println();
        }
    }
}

from flask import Flask, request

app = Flask(__name__)

# sample data to be stored in the server
users = {
    "user1": {
        "name": "John Doe",
        "contacts": ["user2", "user3"],
        "messages": [
            {
                "sender": "user2",
                "content": "Hi John, how are you?",
                "timestamp": "2022-02-18 14:30:00"
            },
            {
                "sender": "user3",
                "content": "Hey John, have you seen the new movie yet?",
                "timestamp": "2022-02-18 14:45:00"
            }
        ]
    },
    "user2": {
        "name": "Jane Doe",
        "contacts": ["user1"],
        "messages": [
            {
                "sender": "user1",
                "content": "Hi Jane, I'm good thanks! How about you?",
                "timestamp": "2022-02-18 14:35:00"
            }
        ]
    },
    "user3": {
        "name": "Bob Smith",
        "contacts": ["user1"],
        "messages": [
            {
                "sender": "user1",
                "content": "Hey Bob, not yet. Is it good?",
                "timestamp": "2022-02-18 14:50:00"
            }
        ]
    }
}

# endpoint for retrieving a user's information
@app.route('/users/<username>', methods=['GET'])
def get_user(username):
    if username in users:
        return users[username], 200
    else:
        return "User not found", 404

# endpoint for retrieving a user's contacts
@app.route('/users/<username>/contacts', methods=['GET'])
def get_user_contacts(username):
    if username in users:
        return users[username]['contacts'], 200
    else:
        return "User not found", 404

# endpoint for retrieving a user's messages
@app.route('/users/<username>/messages', methods=['GET'])
def get_user_messages(username):
    if username in users:
        return users[username]['messages'], 200
    else:
        return "User not found", 404

# endpoint for sending a message
@app.route('/users/<sender>/messages/<recipient>', methods=['POST'])
def send_message(sender, recipient):
    if sender in users and recipient in users:
        content = request.json.get('content')
        timestamp = request.json.get('timestamp')
        message = {"sender": sender, "content": content, "timestamp": timestamp}
        users[sender]['messages'].append(message)
        users[recipient]['messages'].append(message)
        return "Message sent", 200
    else:
        return "User not found", 404

if __name__ == '__main__':
    app.run(debug=True)

import flask
import requests

app = flask.Flask(__name__)

# Define an endpoint for retrieving a list of users
@app.route("/users", methods=["GET"])
def get_users():
    # Make a request to the user service to retrieve a list of users
    response = requests.get("http://localhost:5000/users")
    users = response.json()

    # Return the list of users
    return flask.jsonify(users)

# Define an endpoint for retrieving a list of messages
@app.route("/messages", methods=["GET"])
def get_messages():
    # Make a request to the message service to retrieve a list of messages
    response = requests.get("http://localhost:5001/messages")
    messages = response.json()

    # Return the list of messages
    return flask.jsonify(messages)

# Define an endpoint for sending a message
@app.route("/messages", methods=["POST"])
def send_message():
    # Retrieve the message information from the request body
    message = flask.request.json

    # Make a request to the message service to send the message
    response = requests.post("http://localhost:5001/messages", json=message)

    # Return success
    return flask.jsonify({})

# Example usage
if __name__ == "__main__":
    app.run(port=8000)

from flask import Flask, request

app = Flask(__name__)

messages = {}

@app.route('/send_message', methods=['POST'])
def send_message():
    data = request.json
    recipient = data['recipient']
    message = data['message']
    messages[recipient].append(message)
    return {'status': 'ok'}

@app.route('/get_messages', methods=['GET'])
def get_messages():
    recipient = request.args.get('recipient')
    return {'messages': messages[recipient]}

if __name__ == '__main__':
    app.run()

from flask import Flask, request
from flask_sqlalchemy import SQLAlchemy

app = Flask(__name__)
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///messenger.db'
db = SQLAlchemy(app)

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(50))
    groups = db.relationship('Group', secondary='membership', backref='members')

class Group(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    name = db.Column(db.String(50))
    messages = db.relationship('Message', backref='group')

membership = db.Table('membership',
    db.Column('user_id', db.Integer, db.ForeignKey('user.id')),
    db.Column('group_id', db.Integer, db.ForeignKey('group.id'))
)

class Message(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    content = db.Column(db.String(500))
    sender_id = db.Column(db.Integer, db.ForeignKey('user.id'))
    group_id = db.Column(db.Integer, db.ForeignKey('group.id'))

@app.route('/create_group', methods=['POST'])
def create_group():
    data = request.json
    name = data['name']
    user_id = data['user_id']
    group = Group(name=name)
    user = User.query.get(user_id)
    user.groups.append(group)
    db.session.add(group)
    db.session.commit()
    return {'status': 'ok'}

@app.route('/send_group_message', methods=['POST'])
def send_group_message():
    data = request.json
    content = data['content']
    sender_id = data['sender_id']
    group_id = data['group_id']
    message = Message(content=content, sender_id=sender_id, group_id=group_id)
    db.session.add(message)
    db.session.commit()
    return {'status': 'ok'}

@app.route('/get_group_messages', methods=['GET'])
def get_group_messages():
    group_id = request.args.get('group_id')
    messages = Message.query.filter_by(group_id=group_id).all()
    result = []
    for message in messages:
        sender = User.query.get(message.sender_id)
        result.append({
            'sender': sender.name,
            'content': message.content
        })
    return {'messages': result}

if __name__ == '__main__':
    app.run()

from flask import Flask, request, render_template
from flask_socketio import SocketIO, emit

app = Flask(__name__)
app.config['SECRET_KEY'] = 'secret!'
socketio = SocketIO(app)

@app.route('/')
def index():
    return render_template('index.html')

@socketio.on('join')
def join_room(data):
    room_id = data['room_id']
    join_room(room_id)
    emit('user_joined', {'username': data['username']}, room=room_id)

@socketio.on('leave')
def leave_room(data):
    room_id = data['room_id']
    leave_room(room_id)
    emit('user_left', {'username': data['username']}, room=room_id)

if __name__ == '__main__':
    socketio.run(app)

class User:
    def __init__(self, username, password):
        self.username = username
        self.password = password
        self.is_authenticated = False
        self.is_authorized = False

    def register(self):
        # Store user information in the database
        # Implement necessary validation and hashing for passwords
        
    def login(self):
        # Authenticate user credentials
        # Set is_authenticated to True if credentials are valid

    def check_authorization(self, role):
        # Check if user has the specified role
        # Set is_authorized to True if authorized

# Example usage
user = User("john_doe", "password123")
user.register()
user.login()
user.check_authorization("admin")

class UserProfile:
    def __init__(self, user):
        self.user = user
        self.name = ""
        self.age = 0
        self.preferences = []

    def update_profile(self, name, age, preferences):
        # Update user profile with new information
        self.name = name
        self.age = age
        self.preferences = preferences

# Example usage
user_profile = UserProfile(user)
user_profile.update_profile("John Doe", 30, ["action", "comedy"])

class Friend:
    def __init__(self, username):
        self.username = username

class FriendList:
    def __init__(self, user):
        self.user = user
        self.friends = []

    def add_friend(self, friend):
        # Add a friend to the user's friend list
        self.friends.append(friend)

    def remove_friend(self, friend):
        # Remove a friend from the user's friend list
        self.friends.remove(friend)

# Example usage
friend1 = Friend("friend1_username")
friend2 = Friend("friend2_username")

friend_list = FriendList(user)
friend_list.add_friend(friend1)
friend_list.add_friend(friend2)
friend_list.remove_friend(friend1)

# Implementing a messaging service using a pub/sub pattern
from pubsub import PubSub

class MessagingService:
    def __init__(self):
        self.pubsub = PubSub()

    def send_message(self, sender, recipient, message):
        # Publish the message to the recipient's channel
        self.pubsub.publish(recipient, {"sender": sender, "message": message})

    def receive_message(self, recipient):
        # Subscribe to the recipient's channel and receive messages
        self.pubsub.subscribe(recipient, self.handle_message)

    def handle_message(self, message):
        # Handle the received message
        sender = message["sender"]
        text = message["message"]
        print(f"Received message from {sender}: {text}")

# Example usage
messaging_service = MessagingService()
messaging_service.receive_message(user.username)
messaging_service.send_message(user.username, "friend1_username", "Hello!")

# Implementing message queues using a library like Celery
from celery import Celery

app = Celery('tasks', broker='redis://localhost:6379/0')

@app.task
def send_message(sender, recipient, message):
    # Send the message to the recipient
    print(f"Sending message from {sender} to {recipient}: {message}")

# Example usage
send_message.delay(user.username, "friend1_username", "Hello!")

# Implementing push notifications using a third-party service
from push_notifications import PushNotificationService

class NotificationService:
    def __init__(self):
        self.push_service = PushNotificationService()

    def send_push_notification(self, user, message):
        # Send push notification to the user's device
        device_token = user.device_token  # Assuming device token is stored in the user object
        self.push_service.send_notification(device_token, message)

# Example usage
notification_service = NotificationService()
notification_service.send_push_notification(user, "New message received!")

# Implementing WebSocket protocols using a library like Flask-SocketIO
from flask import Flask
from flask_socketio import SocketIO, send, emit

app = Flask(__name__)
socketio = SocketIO(app)

@socketio.on('message')
def handle_message(message):
    # Handle the received message
    sender = message['sender']
    text = message['message']
    print(f"Received message from {sender}: {text}")

# Example usage
@app.route('/')
def index():
    return 'WebSocket Server'

if __name__ == '__main__':
    socketio.run(app)

class GroupChat:
    def __init__(self, name):
        self.name = name
        self.members = []

    def add_member(self, member):
        # Add a member to the group chat
        self.members.append(member)

    def remove_member(self, member):
        # Remove a member from the group chat
        self.members.remove(member)

# Example usage
group_chat = GroupChat("Group Chat 1")
group_chat.add_member(user)
group_chat.add_member(friend1)
group_chat.add_member(friend2)
group_chat.remove_member(friend1)

class Group:
    def __init__(self, name, owner):
        self.name = name
        self.owner = owner
        self.members = [owner]

    def add_member(self, member):
        # Add a member to the group
        self.members.append(member)

    def remove_member(self, member):
        # Remove a member from the group
        self.members.remove(member)

    def change_owner(self, new_owner):
        # Change the owner of the group
        self.owner = new_owner

# Example usage
group = Group("Group 1", user)
group.add_member(friend1)
group.add_member(friend2)
group.remove_member(friend1)
group.change_owner(friend2)

class TopicChannel:
    def __init__(self, name):
        self.name = name
        self.messages = []

    def add_message(self, message):
        # Add a message to the topic channel
        self.messages.append(message)

    def get_messages(self):
        # Retrieve all messages in the topic channel
        return self.messages

# Example usage
topic_channel = TopicChannel("Movies")
topic_channel.add_message("What's your favorite movie?")
topic_channel.add_message("I recently watched a great action movie.")
messages = topic_channel.get_messages()
for message in messages:
    print(message)

class Message:
    def __init__(self, sender, recipient, content):
        self.sender = sender
        self.recipient = recipient
        self.content = content
        self.timestamp = datetime.now()

class MessageStorage:
    def __init__(self):
        self.messages = []

    def store_message(self, message):
        # Store the message in the message storage
        self.messages.append(message)

    def get_messages(self, user):
        # Retrieve all messages involving the user
        return [message for message in self.messages if user in [message.sender, message.recipient]]

# Example usage
message_storage = MessageStorage()
message1 = Message(user, friend1, "Hello!")
message2 = Message(friend1, user, "Hi!")
message_storage.store_message(message1)
message_storage.store_message(message2)
messages = message_storage.get_messages(user)
for message in messages:
    print(f"{message.sender.username}: {message.content}")

import sqlalchemy
from sqlalchemy import create_engine, Column, Integer, String, DateTime
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker

Base = declarative_base()

class Message(Base):
    __tablename__ = 'messages'

    id = Column(Integer, primary_key=True)
    sender = Column(String)
    recipient = Column(String)
    content = Column(String)
    timestamp = Column(DateTime)

# Create engine and session
engine = create_engine('sqlite:///messages.db')
Session = sessionmaker(bind=engine)
session = Session()

# Create table if not exists
Base.metadata.create_all(engine)

# Store message
message = Message(sender=user.username, recipient=friend1.username, content='Hello!', timestamp=datetime.now())
session.add(message)
session.commit()

# Retrieve messages
messages = session.query(Message).filter(Message.sender == user.username, Message.recipient == friend1.username).all()
for message in messages:
    print(f"{message.sender}: {message.content}")

# Adding search functionality to MessageStorage class

class MessageStorage:
    def __init__(self):
        self.messages = []

    def store_message(self, message):
        # Store the message in the message storage
        self.messages.append(message)

    def get_messages(self, user):
        # Retrieve all messages involving the user
        return [message for message in self.messages if user in [message.sender, message.recipient]]

    def search_messages(self, query):
        # Search messages by content or sender/recipient usernames
        return [message for message in self.messages if query in [message.sender.username, message.recipient.username, message.content]]

# Example usage
message_storage = MessageStorage()
message1 = Message(user, friend1, "Hello!")
message2 = Message(friend1, user, "Hi!")
message_storage.store_message(message1)
message_storage.store_message(message2)

# Retrieve messages for a user
messages = message_storage.get_messages(user)
for message in messages:
    print(f"{message.sender.username}: {message.content}")

# Search messages
search_results = message_storage.search_messages("Hi")
for result in search_results:
    print(f"{result.sender.username}: {result.content}")

# Implementing real-time notifications using a library like Flask-SocketIO

from flask import Flask
from flask_socketio import SocketIO, emit

app = Flask(__name__)
socketio = SocketIO(app)

@socketio.on('message')
def handle_message(message):
    # Handle the received message
    sender = message['sender']
    text = message['text']
    # Store the message
    store_message(sender, text)
    # Emit a notification event to the recipient
    emit('notification', f"You have a new message from {sender}!")

# Example usage
@app.route('/')
def index():
    return 'WebSocket Server'

if __name__ == '__main__':
    socketio.run(app)

class User:
    def __init__(self, username):
        self.username = username
        self.is_online = False

    def set_online(self):
        self.is_online = True

    def set_offline(self):
        self.is_online = False

# Example usage
user = User("john_doe")
user.set_online()

# Display user status
if user.is_online:
    print(f"{user.username} is online.")
else:
    print(f"{user.username} is offline.")

class Message:
    def __init__(self, sender, recipient, content):
        self.sender = sender
        self.recipient = recipient
        self.content = content
        self.is_read = False

    def mark_as_read(self):
        self.is_read = True

# Example usage
message = Message(user, friend1, "Hello!")
message.mark_as_read()

# Display read receipt
if message.is_read:
    print("Message has been read.")
else:
    print("Message has not been read.")

class MultimediaMessage(Message):
    def __init__(self, sender, recipient, content, media_type):
        super().__init__(sender, recipient, content)
        self.media_type = media_type

# Example usage
multimedia_message = MultimediaMessage(user, friend1, "Check out this photo!", "image")

# Storing and managing media files
import os
import shutil

def store_media_file(file_path, target_directory):
    # Copy the media file to the target directory
    file_name = os.path.basename(file_path)
    target_path = os.path.join(target_directory, file_name)
    shutil.copy(file_path, target_path)

# Example usage
media_file_path = "path/to/image.jpg"
target_directory = "media"
store_media_file(media_file_path, target_directory)

# Designing systems for media storage, thumbnail generation, and content delivery
class MediaStorage:
    def __init__(self):
        self.media_files = []

    def store_media_file(self, file_path):
        # Store the media file
        self.media_files.append(file_path)

    def generate_thumbnail(self, file_path, thumbnail_size):
        # Generate a thumbnail for the media file
        thumbnail_path = f"{file_path}_thumbnail"
        # Code for generating the thumbnail
        return thumbnail_path

# Example usage
media_storage = MediaStorage()
media_file_path = "path/to/image.jpg"
media_storage.store_media_file(media_file_path)
thumbnail_path = media_storage.generate_thumbnail(media_file_path, (100, 100))

# Implementing encryption and privacy measures for secure media sharing
def encrypt_media_file(file_path, encryption_key):
    # Encrypt the media file
    # Code for encryption
    encrypted_file_path = f"{file_path}.enc"
    return encrypted_file_path

def decrypt_media_file(encrypted_file_path, decryption_key):
    # Decrypt the encrypted media file
    # Code for decryption
    decrypted_file_path = encrypted_file_path.replace(".enc", "")
    return decrypted_file_path

# Example usage
media_file_path = "path/to/image.jpg"
encryption_key = "encryption_key"
encrypted_file_path = encrypt_media_file(media_file_path, encryption_key)
decrypted_file_path = decrypt_media_file(encrypted_file_path, encryption_key)

# Implementing end-to-end encryption using a library like cryptography

from cryptography.fernet import Fernet

class EncryptionService:
    def __init__(self, encryption_key):
        self.encryption_key = encryption_key
        self.cipher = Fernet(encryption_key)

    def encrypt_message(self, message):
        # Encrypt the message
        encrypted_message = self.cipher.encrypt(message.encode())
        return encrypted_message

    def decrypt_message(self, encrypted_message):
        # Decrypt the encrypted message
        decrypted_message = self.cipher.decrypt(encrypted_message)
        return decrypted_message.decode()

# Example usage
encryption_key = Fernet.generate_key()
encryption_service = EncryptionService(encryption_key)
message = "Hello, this is a confidential message!"
encrypted_message = encryption_service.encrypt_message(message)
decrypted_message = encryption_service.decrypt_message(encrypted_message)

# Utilizing encryption protocols using a library like python-gnupg

import gnupg

class EncryptionService:
    def __init__(self):
        self.gpg = gnupg.GPG()

    def encrypt_message(self, message, recipient_public_key):
        # Encrypt the message using the recipient's public key
        encrypted_data = self.gpg.encrypt(message, recipient_public_key)
        encrypted_message = str(encrypted_data)
        return encrypted_message

    def decrypt_message(self, encrypted_message, recipient_private_key):
        # Decrypt the encrypted message using the recipient's private key
        decrypted_data = self.gpg.decrypt(encrypted_message, recipient_private_key)
        decrypted_message = str(decrypted_data)
        return decrypted_message

# Example usage
encryption_service = EncryptionService()
recipient_public_key = "-----BEGIN PGP PUBLIC KEY BLOCK-----\n[Recipient's Public Key]\n-----END PGP PUBLIC KEY BLOCK-----"
recipient_private_key = "-----BEGIN PGP PRIVATE KEY BLOCK-----\n[Recipient's Private Key]\n-----END PGP PRIVATE KEY BLOCK-----"
message = "Hello, this is a confidential message!"
encrypted_message = encryption_service.encrypt_message(message, recipient_public_key)
decrypted_message = encryption_service.decrypt_message(encrypted_message, recipient_private_key)

# Enabling emojis using a library like emoji

import emoji

# Example usage
text_with_emoji = "I'm feeling :smiley: today!"
text_with_emoji_emojized = emoji.emojize(text_with_emoji)
print(text_with_emoji_emojized)

# Output: I'm feeling 😃 today!

# Designing voice and video calling functionalities using a library like Twilio

from twilio.rest import Client

class VoiceVideoCallService:
    def __init__(self, account_sid, auth_token):
        self.client = Client(account_sid, auth_token)

    def make_voice_call(self, from_number, to_number):
        # Make a voice call using Twilio
        call = self.client.calls.create(
            twiml='<Response><Say>Hello, this is a voice call!</Say></Response>',
            from_=from_number,
            to=to_number
        )
        return call.sid

    def make_video_call(self, from_number, to_number):
        # Make a video call using Twilio
        call = self.client.calls.create(
            twiml='<Response><Say>Hello, this is a video call!</Say></Response>',
            from_=from_number,
            to=to_number,
            media_url='https://example.com/video.mp4'
        )
        return call.sid

# Example usage
account_sid = 'YOUR_ACCOUNT_SID'
auth_token = 'YOUR_AUTH_TOKEN'
voice_video_call_service = VoiceVideoCallService(account_sid, auth_token)
from_number = '+1234567890'
to_number = '+9876543210'
voice_call_sid = voice_video_call_service.make_voice_call(from_number, to_number)
video_call_sid = voice_video_call_service.make_video_call(from_number, to_number)

# Designing user interfaces and APIs for cross-platform compatibility using a framework like Flask

from flask import Flask, request

app = Flask(__name__)

@app.route('/api/send-message', methods=['POST'])
def send_message():
    # Handle sending a message
    data = request.get_json()
    recipient = data['recipient']
    message = data['message']
    # Code for sending the message
    return 'Message sent successfully'

@app.route('/api/receive-message', methods=['POST'])
def receive_message():
    # Handle receiving a message
    data = request.get_json()
    sender = data['sender']
    message = data['message']
    # Code for processing the received message
    return 'Message received successfully'

# Example usage
if __name__ == '__main__':
    app.run()

# Implementing caching using a library like Flask-Caching

from flask import Flask
from flask_caching import Cache

app = Flask(__name__)
cache = Cache(app, config={'CACHE_TYPE': 'simple'})

@app.route('/api/get-user/<user_id>')
@cache.cached(timeout=300)
def get_user(user_id):
    # Code for retrieving user data from the database
    return user_data

# Example usage
if __name__ == '__main__':
    app.run()

class GroupChat:
    def __init__(self, name, creator):
        self.name = name
        self.creator = creator
        self.members = [creator]
        self.messages = []

    def add_member(self, user):
        self.members.append(user)

    def remove_member(self, user):
        if user == self.creator:
            raise ValueError("Creator cannot be removed from the group")
        self.members.remove(user)

    def send_message(self, sender, content):
        message = Message(sender, self.members, content)
        self.messages.append(message)

# Example usage
user1 = User("user1")
user2 = User("user2")
group_chat = GroupChat("Group Chat", user1)
group_chat.add_member(user2)
group_chat.send_message(user1, "Hello everyone!")

class Channel:
    def __init__(self, name):
        self.name = name
        self.subscribers = []
        self.messages = []

    def subscribe(self, user):
        self.subscribers.append(user)

    def unsubscribe(self, user):
        self.subscribers.remove(user)

    def send_message(self, sender, content):
        message = Message(sender, self.subscribers, content)
        self.messages.append(message)

# Example usage
user1 = User("user1")
user2 = User("user2")
channel = Channel("Technology")
channel.subscribe(user1)
channel.subscribe(user2)
channel.send_message(user1, "New article on AI")

class NotificationService:
    def send_notification(self, user, message):
        # Code for sending a notification to the user
        pass

# Example usage
notification_service = NotificationService()
user = User("user1")
message = "New message received"
notification_service.send_notification(user, message)

class PresenceService:
    def update_presence(self, user, status):
        # Code for updating the user's presence status
        pass

# Example usage
presence_service = PresenceService()
user = User("user1")
status = "online"
presence_service.update_presence(user, status)

class MessageService:
    def send_typing_indicator(self, sender, recipient):
        # Code for sending a typing indicator to the recipient
        pass

    def send_read_receipt(self, sender, recipient, message):
        # Code for sending a read receipt to the sender
        pass

# Example usage
message_service = MessageService()
sender = User("user1")
recipient = User("user2")
message = "Hello"
message_service.send_typing_indicator(sender, recipient)
message_service.send_read_receipt(recipient, sender, message)

class MultimediaMessage:
    def __init__(self, sender, recipients, content, media):
        self.sender = sender
        self.recipients = recipients
        self.content = content
        self.media = media

    def send(self):
        # Code for sending the multimedia message to the recipients
        pass

# Example usage
user1 = User("user1")
user2 = User("user2")
media_file = "path/to/media/file.jpg"
message = "Check out this photo!"
multimedia_message = MultimediaMessage(user1, [user2], message, media_file)
multimedia_message.send()

class MediaService:
    def upload_media(self, file):
        # Code for uploading media file to a storage service
        pass

    def generate_thumbnail(self, media):
        # Code for generating a thumbnail image from the media
        pass

    def get_media_url(self, media):
        # Code for retrieving the URL of the media file
        pass

# Example usage
media_service = MediaService()
media_file = "path/to/media/file.jpg"
uploaded_media = media_service.upload_media(media_file)
thumbnail_image = media_service.generate_thumbnail(uploaded_media)
thumbnail_url = media_service.get_media_url(thumbnail_image)

class MediaEncryptionService:
    def encrypt_media(self, media):
        # Code for encrypting the media file
        pass

    def decrypt_media(self, encrypted_media):
        # Code for decrypting the encrypted media file
        pass

# Example usage
media_encryption_service = MediaEncryptionService()
media_file = "path/to/media/file.jpg"
encrypted_media = media_encryption_service.encrypt_media(media_file)
decrypted_media = media_encryption_service.decrypt_media(encrypted_media)

# Utilizing encryption libraries like cryptography

from cryptography.fernet import Fernet

class EndToEndEncryptionService:
    def __init__(self, secret_key):
        self.fernet = Fernet(secret_key)

    def encrypt_message(self, message):
        encrypted_message = self.fernet.encrypt(message.encode())
        return encrypted_message

    def decrypt_message(self, encrypted_message):
        decrypted_message = self.fernet.decrypt(encrypted_message).decode()
        return decrypted_message

# Example usage
secret_key = Fernet.generate_key()
encryption_service = EndToEndEncryptionService(secret_key)
message = "Hello, this is a confidential message!"
encrypted_message = encryption_service.encrypt_message(message)
decrypted_message = encryption_service.decrypt_message(encrypted_message)

class Message:
    def __init__(self, sender, recipients, content, emojis=None, stickers=None):
        self.sender = sender
        self.recipients = recipients
        self.content = content
        self.emojis = emojis or []
        self.stickers = stickers or []

    def add_emoji(self, emoji):
        self.emojis.append(emoji)

    def add_sticker(self, sticker):
        self.stickers.append(sticker)

# Example usage
user1 = User("user1")
user2 = User("user2")
message = "Hello!"
message_with_emoji = Message(user1, [user2], message)
message_with_emoji.add_emoji("😄")
message_with_emoji.add_sticker("cat_sticker")

# Integrating with a third-party library like python-emoji for emoji support

import emoji

class EmojiService:
    def extract_emojis(self, text):
        return emoji.demojize(text)

    def add_emojis(self, text):
        return emoji.emojize(text)

# Example usage
emoji_service = EmojiService()
text = "Hello! 😄"
extracted_emojis = emoji_service.extract_emojis(text)
text_with_emojis = emoji_service.add_emojis(extracted_emojis)

# Utilizing a library like Twilio for voice and video calling

from twilio.rest import Client

class CallService:
    def __init__(self, account_sid, auth_token):
        self.client = Client(account_sid, auth_token)

    def make_voice_call(self, from_number, to_number):
        call = self.client.calls.create(
            twiml='<Response><Say>Hello, this is a voice call.</Say></Response>',
            from_=from_number,
            to=to_number
        )
        return call.sid

    def make_video_call(self, from_number, to_number):
        call = self.client.calls.create(
            twiml='<Response><Say>Hello, this is a video call.</Say></Response>',
            from_=from_number,
            to=to_number,
            twiml='<Response><Say>Hello, this is a video call.</Say></Response>'
        )
        return call.sid

# Example usage
account_sid = 'YOUR_ACCOUNT_SID'
auth_token = 'YOUR_AUTH_TOKEN'
call_service = CallService(account_sid, auth_token)
from_number = '+1234567890'
to_number = '+9876543210'
voice_call_sid = call_service.make_voice_call(from_number, to_number)
video_call_sid = call_service.make_video_call(from_number, to_number)

import java.util.*;

class User {
    private String userId;
    private String username;
    private String email;
    private String password;
    // other user attributes
    
    public User(String userId, String username, String email, String password) {
        this.userId = userId;
        this.username = username;
        this.email = email;
        this.password = password;
        // initialize other attributes
    }
    
    // Getters and setters for attributes
    // ...
}

class Flight {
    private String flightId;
    private String airline;
    private String origin;
    private String destination;
    private Date departureTime;
    private Date arrivalTime;
    private double price;
    // other flight attributes
    
    public Flight(String flightId, String airline, String origin, String destination, Date departureTime, Date arrivalTime, double price) {
        this.flightId = flightId;
        this.airline = airline;
        this.origin = origin;
        this.destination = destination;
        this.departureTime = departureTime;
        this.arrivalTime = arrivalTime;
        this.price = price;
        // initialize other attributes
    }
    
    // Getters and setters for attributes
    // ...
}

class Hotel {
    private String hotelId;
    private String name;
    private String location;
    private double rating;
    private double price;
    // other hotel attributes
    
    public Hotel(String hotelId, String name, String location, double rating, double price) {
        this.hotelId = hotelId;
        this.name = name;
        this.location = location;
        this.rating = rating;
        this.price = price;
        // initialize other attributes
    }
    
    // Getters and setters for attributes
    // ...
}

class CarRental {
    private String carRentalId;
    private String carType;
    private String rentalCompany;
    private String location;
    private double price;
    // other car rental attributes
    
    public CarRental(String carRentalId, String carType, String rentalCompany, String location, double price) {
        this.carRentalId = carRentalId;
        this.carType = carType;
        this.rentalCompany = rentalCompany;
        this.location = location;
        this.price = price;
        // initialize other attributes
    }
    
    // Getters and setters for attributes
    // ...
}

class Booking {
    private String bookingId;
    private User user;
    private Flight flight;
    private Hotel hotel;
    private CarRental carRental;
    private Date bookingDate;
    
    public Booking(String bookingId, User user, Flight flight, Hotel hotel, CarRental carRental, Date bookingDate) {
        this.bookingId = bookingId;
        this.user = user;
        this.flight = flight;
        this.hotel = hotel;
        this.carRental = carRental;
        this.bookingDate = bookingDate;
    }
    
    // Getters and setters for attributes
    // ...
}

class Kayak {
    private Map<String, User> users;
    private List<Flight> flights;
    private List<Hotel> hotels;
    private List<CarRental> carRentals;
    private List<Booking> bookings;
    
    public Kayak() {
        this.users = new HashMap<>();
        this.flights = new ArrayList<>();
        this.hotels = new ArrayList<>();
        this.carRentals = new ArrayList<>();
        this.bookings = new ArrayList<>();
    }
    
    public void addUser(User user) {
        users.put(user.getUserId(), user);
    }
    
    public User getUserById(String userId) {
        return users.get(userId);
    }
    
    public void addFlight(Flight flight) {
        flights.add(flight);
    }
    
    public void addHotel(Hotel hotel) {
        hotels.add(hotel);
    }
    
    public void addCarRental(CarRental carRental) {
        carRentals.add(carRental);
    }
    
    public void createBooking(String userId, String flightId, String hotelId, String carRentalId, Date bookingDate) {
        User user = getUserById(userId);
        Flight flight = getFlightById(flightId);
        Hotel hotel = getHotelById(hotelId);
        CarRental carRental = getCarRentalById(carRentalId);
        
        if (user == null || flight == null || hotel == null || carRental == null) {
            System.out.println("Invalid booking request");
            return;
        }
        
        String bookingId = generateBookingId(); // Generate a unique booking ID
        Booking booking = new Booking(bookingId, user, flight, hotel, carRental, bookingDate);
        bookings.add(booking);
        
        // Additional logic for payment, confirmation, etc.
        // ...
    }
    
    // Additional methods for retrieving flights, hotels, car rentals, etc.
    // ...
}

from flask import Flask, request, jsonify

app = Flask(__name__)

users = {
    "user1": {
        "name": "John Doe",
        "email": "[email protected]",
        "password": "password123"
    },
    "user2": {
        "name": "Jane Smith",
        "email": "[email protected]",
        "password": "password456"
    }
}

flights = {
    "flight1": {
        "airline": "Delta",
        "origin": "New York",
        "destination": "Los Angeles",
        "departure_time": "2023-07-01T10:00:00",
        "arrival_time": "2023-07-01T13:00:00",
        "price": 300.0
    },
    "flight2": {
        "airline": "United",
        "origin": "Chicago",
        "destination": "San Francisco",
        "departure_time": "2023-07-02T12:00:00",
        "arrival_time": "2023-07-02T15:00:00",
        "price": 350.0
    }
}

hotels = {
    "hotel1": {
        "name": "Hilton",
        "location": "New York",
        "rating": 4.5,
        "price": 200.0
    },
    "hotel2": {
        "name": "Marriott",
        "location": "Los Angeles",
        "rating": 4.0,
        "price": 180.0
    }
}

car_rentals = {
    "car1": {
        "car_type": "Sedan",
        "rental_company": "Hertz",
        "location": "New York",
        "price": 50.0
    },
    "car2": {
        "car_type": "SUV",
        "rental_company": "Enterprise",
        "location": "Los Angeles",
        "price": 60.0
    }
}

bookings = {}

# User Registration API
@app.route("/users", methods=["POST"])
def register_user():
    data = request.get_json()
    username = data.get("username")
    email = data.get("email")
    password = data.get("password")
    
    if not username or not email or not password:
        return jsonify(message="Incomplete request data"), 400
    
    if username in users:
        return jsonify(message="Username already exists"), 409
    
    users[username] = {
        "name": data.get("name"),
        "email": email,
        "password": password
    }
    
    return jsonify(message="User registration successful"), 201

# User Login API
@app.route("/login", methods=["POST"])
def login_user():
    data = request.get_json()
    username = data.get("username")
    password = data.get("password")
    
    if not username or not password:
        return jsonify(message="Incomplete request data"), 400
    
    if username not in users or users[username]["password"] != password:
        return jsonify(message="Invalid username or password"), 401
    
    return jsonify(message="Login successful"), 200

# Flight Search API
@app.route("/flights", methods=["GET"])
def search_flights():
    origin = request.args.get("origin")
    destination = request.args.get("destination")
    
    if not origin or not destination:
        return jsonify(message="Incomplete request data"), 400
    
    results = []
    for flight_id, flight in flights.items():
        if flight["origin"] == origin and flight["destination"] == destination:
            results.append({
                "flight_id": flight_id,
                "airline": flight["airline"],
                "departure_time": flight["departure_time"],
                "arrival_time": flight["arrival_time"],
                "price": flight["price"]
            })
    
    return jsonify(results), 200

# Hotel Search API
@app.route("/hotels", methods=["GET"])
def search_hotels():
    location = request.args.get("location")
    
    if not location:
        return jsonify(message="Incomplete request data"), 400
    
    results = []
    for hotel_id, hotel in hotels.items():
        if hotel["location"] == location:
            results.append({
                "hotel_id": hotel_id,
                "name": hotel["name"],
                "rating": hotel["rating"],
                "price": hotel["price"]
            })
    
    return jsonify(results), 200

# Car Rental Search API
@app.route("/car-rentals", methods=["GET"])
def search_car_rentals():
    location = request.args.get("location")
    
    if not location:
        return jsonify(message="Incomplete request data"), 400
    
    results = []
    for car_id, car_rental in car_rentals.items():
        if car_rental["location"] == location:
            results.append({
                "car_id": car_id,
                "car_type": car_rental["car_type"],
                "rental_company": car_rental["rental_company"],
                "price": car_rental["price"]
            })
    
    return jsonify(results), 200

# Create Booking API
@app.route("/bookings", methods=["POST"])
def create_booking():
    data = request.get_json()
    username = data.get("username")
    flight_id = data.get("flight_id")
    hotel_id = data.get("hotel_id")
    car_id = data.get("car_id")
    
    if not username or not flight_id or not hotel_id or not car_id:
        return jsonify(message="Incomplete request data"), 400
    
    if username not in users:
        return jsonify(message="Invalid username"), 404
    
    if flight_id not in flights:
        return jsonify(message="Invalid flight ID"), 404
    
    if hotel_id not in hotels:
        return jsonify(message="Invalid hotel ID"), 404
    
    if car_id not in car_rentals:
        return jsonify(message="Invalid car rental ID"), 404
    
    booking_id = str(len(bookings) + 1)
    bookings[booking_id] = {
        "username": username,
        "flight": flights[flight_id],
        "hotel": hotels[hotel_id],
        "car_rental": car_rentals[car_id]
    }
    
    return jsonify(message="Booking created successfully", booking_id=booking_id), 201

from flask import Flask, request, jsonify

app = Flask(__name__)

# Mock flight data
flights = [
    {
        "id": 1,
        "airline": "Airline A",
        "origin": "SFO",
        "destination": "NYC",
        "departure_time": "2023-07-10 09:00:00",
        "arrival_time": "2023-07-10 14:00:00",
        "price": 250.0
    },
    {
        "id": 2,
        "airline": "Airline B",
        "origin": "SFO",
        "destination": "NYC",
        "departure_time": "2023-07-10 12:00:00",
        "arrival_time": "2023-07-10 17:00:00",
        "price": 200.0
    },
    {
        "id": 3,
        "airline": "Airline C",
        "origin": "SFO",
        "destination": "NYC",
        "departure_time": "2023-07-10 15:00:00",
        "arrival_time": "2023-07-10 20:00:00",
        "price": 300.0
    }
]

@app.route('/flights/search', methods=['POST'])
def flight_search():
    origin = request.json.get('origin')
    destination = request.json.get('destination')
    departure_date = request.json.get('departure_date')
    passengers = request.json.get('passengers')
    
    # Perform flight search based on parameters
    
    # Mock search results
    results = []
    for flight in flights:
        if flight['origin'] == origin and flight['destination'] == destination:
            results.append(flight)
    
    return jsonify(results), 200

if __name__ == '__main__':
    app.run()

from flask import Flask, request, jsonify

app = Flask(__name__)

# Mock flight data
flights = [
    {
        "id": 1,
        "airline": "Airline A",
        "origin": "SFO",
        "destination": "NYC",
        "departure_time": "2023-07-10 09:00:00",
        "arrival_time": "2023-07-10 14:00:00",
        "price": 250.0
    },
    {
        "id": 2,
        "airline": "Airline B",
        "origin": "SFO",
        "destination": "NYC",
        "departure_time": "2023-07-10 12:00:00",
        "arrival_time": "2023-07-10 17:00:00",
        "price": 200.0
    },
    {
        "id": 3,
        "airline": "Airline C",
        "origin": "SFO",
        "destination": "NYC",
        "departure_time": "2023-07-10 15:00:00",
        "arrival_time": "2023-07-10 20:00:00",
        "price": 300.0
    }
]

@app.route('/flights/search', methods=['POST'])
def flight_search():
    origin = request.json.get('origin')
    destination = request.json.get('destination')
    departure_date = request.json.get('departure_date')
    passengers = request.json.get('passengers')
    
    results = []
    for flight in flights:
        if flight['origin'] == origin and flight['destination'] == destination:
            results.append(flight)
    
    return jsonify(results), 200

if __name__ == '__main__':
    app.run()

from flask import Flask, request, jsonify

app = Flask(__name__)

# Mock hotel data
hotels = [
    {
        "id": 1,
        "name": "Hotel A",
        "location": "NYC",
        "rating": 4.5,
        "price": 150.0
    },
    {
        "id": 2,
        "name": "Hotel B",
        "location": "NYC",
        "rating": 3.8,
        "price": 100.0
    },
    {
        "id": 3,
        "name": "Hotel C",
        "location": "NYC",
        "rating": 4.2,
        "price": 180.0
    }
]

@app.route('/hotels/search', methods=['POST'])
def hotel_search():
    location = request.json.get('location')
    check_in_date = request.json.get('check_in_date')
    check_out_date = request.json.get('check_out_date')
    guests = request.json.get('guests')
    
    results = []
    for hotel in hotels:
        if hotel['location'] == location:
            results.append(hotel)
    
    return jsonify(results), 200

if __name__ == '__main__':
    app.run()

from flask import Flask, request, jsonify

app = Flask(__name__)

# Mock car rental data
car_rentals = [
    {
        "id": 1,
        "car_type": "Sedan",
        "rental_company": "Company A",
        "location": "NYC",
        "price": 50.0
    },
    {
        "id": 2,
        "car_type": "SUV",
        "rental_company": "Company B",
        "location": "NYC",
        "price": 80.0
    },
    {
        "id": 3,
        "car_type": "Compact",
        "rental_company": "Company C",
        "location": "NYC",
        "price": 60.0
    }
]

@app.route('/car-rentals/search', methods=['POST'])
def car_rental_search():
    location = request.json.get('location')
    pickup_date = request.json.get('pickup_date')
    return_date = request.json.get('return_date')
    passengers = request.json.get('passengers')
    
    results = []
    for car_rental in car_rentals:
        if car_rental['location'] == location:
            results.append(car_rental)
    
    return jsonify(results), 200

if __name__ == '__main__':
    app.run()

from flask import Flask, request, jsonify

app = Flask(__name__)

# Mock booking data
bookings = []

@app.route('/bookings', methods=['POST'])
def create_booking():
    user_id = request.json.get('user_id')
    flight_id = request.json.get('flight_id')
    hotel_id = request.json.get('hotel_id')
    car_id = request.json.get('car_id')
    booking_date = request.json.get('booking_date')
    
    booking = {
        "user_id": user_id,
        "flight_id": flight_id,
        "hotel_id": hotel_id,
        "car_id": car_id,
        "booking_date": booking_date
    }
    
    bookings.append(booking)
    
    return jsonify({"message": "Booking created successfully"}), 200

if __name__ == '__main__':
    app.run()

from flask import Flask, request, jsonify

app = Flask(__name__)

# Flight data
flights = [
    {
        "id": 1,
        "airline": "Airline A",
        "origin": "SFO",
        "destination": "NYC",
        "departure_time": "2023-07-10 09:00:00",
        "arrival_time": "2023-07-10 14:00:00",
        "price": 250.0
    },
    {
        "id": 2,
        "airline": "Airline B",
        "origin": "SFO",
        "destination": "NYC",
        "departure_time": "2023-07-10 12:00:00",
        "arrival_time": "2023-07-10 17:00:00",
        "price": 200.0
    },
    {
        "id": 3,
        "airline": "Airline C",
        "origin": "SFO",
        "destination": "NYC",
        "departure_time": "2023-07-10 15:00:00",
        "arrival_time": "2023-07-10 20:00:00",
        "price": 300.0
    }
]

# Hotel data
hotels = [
    {
        "id": 1,
        "name": "Hotel A",
        "location": "NYC",
        "rating": 4.5,
        "price": 150.0
    },
    {
        "id": 2,
        "name": "Hotel B",
        "location": "NYC",
        "rating": 3.8,
        "price": 100.0
    },
    {
        "id": 3,
        "name": "Hotel C",
        "location": "NYC",
        "rating": 4.2,
        "price": 180.0
    }
]

# Car rental data
car_rentals = [
    {
        "id": 1,
        "car_type": "Sedan",
        "rental_company": "Company A",
        "location": "NYC",
        "price": 50.0
    },
    {
        "id": 2,
        "car_type": "SUV",
        "rental_company": "Company B",
        "location": "NYC",
        "price": 80.0
    },
    {
        "id": 3,
        "car_type": "Compact",
        "rental_company": "Company C",
        "location": "NYC",
        "price": 60.0
    }
]

# Bookings data
bookings = []

@app.route('/flights', methods=['GET'])
def search_flights():
    origin = request.args.get('origin')
    destination = request.args.get('destination')
    departure_date = request.args.get('departure_date')
    passengers = int(request.args.get('passengers', 1))
    
    results = []
    for flight in flights:
        if flight['origin'] == origin and flight['destination'] == destination:
            results.append(flight)
    
    return jsonify(results), 200

@app.route('/flights/book', methods=['POST'])
def book_flight():
    flight_id = int(request.json.get('flight_id'))
    passengers = int(request.json.get('passengers', 1))
    
    for flight in flights:
        if flight['id'] == flight_id:
            booking = {
                "flight": flight,
                "passengers": passengers
            }
            bookings.append(booking)
            return jsonify({"message": "Flight booked successfully"}), 200
    
    return jsonify({"message": "Flight not found"}), 404

@app.route('/hotels', methods=['GET'])
def search_hotels():
    location = request.args.get('location')
    check_in_date = request.args.get('check_in_date')
    check_out_date = request.args.get('check_out_date')
    guests = int(request.args.get('guests', 1))
    
    results = []
    for hotel in hotels:
        if hotel['location'] == location:
            results.append(hotel)
    
    return jsonify(results), 200

@app.route('/hotels/book', methods=['POST'])
def book_hotel():
    hotel_id = int(request.json.get('hotel_id'))
    guests = int(request.json.get('guests', 1))
    
    for hotel in hotels:
        if hotel['id'] == hotel_id:
            booking = {
                "hotel": hotel,
                "guests": guests
            }
            bookings.append(booking)
            return jsonify({"message": "Hotel booked successfully"}), 200
    
    return jsonify({"message": "Hotel not found"}), 404

@app.route('/car-rentals', methods=['GET'])
def search_car_rentals():
    location = request.args.get('location')
    pickup_date = request.args.get('pickup_date')
    return_date = request.args.get('return_date')
    passengers = int(request.args.get('passengers', 1))
    
    results = []
    for car_rental in car_rentals:
        if car_rental['location'] == location:
            results.append(car_rental)
    
    return jsonify(results), 200

@app.route('/car-rentals/book', methods=['POST'])
def book_car_rental():
    car_id = int(request.json.get('car_id'))
    passengers = int(request.json.get('passengers', 1))
    
    for car_rental in car_rentals:
        if car_rental['id'] == car_id:
            booking = {
                "car_rental": car_rental,
                "passengers": passengers
            }
            bookings.append(booking)
            return jsonify({"message": "Car rental booked successfully"}), 200
    
    return jsonify({"message": "Car rental not found"}), 404

@app.route('/vacation-packages', methods=['POST'])
def create_vacation_package():
    flight_id = int(request.json.get('flight_id'))
    hotel_id = int(request.json.get('hotel_id'))
    car_id = int(request.json.get('car_id'))
    
    flight = next((f for f in flights if f['id'] == flight_id), None)
    hotel = next((h for h in hotels if h['id'] == hotel_id), None)
    car_rental = next((c for c in car_rentals if c['id'] == car_id), None)
    
    if flight and hotel and car_rental:
        package = {
            "flight": flight,
            "hotel": hotel,
            "car_rental": car_rental
        }
        bookings.append(package)
        return jsonify({"message": "Vacation package created successfully"}), 200
    
    return jsonify({"message": "Invalid flight, hotel, or car rental"}), 400

@app.route('/price-alerts', methods=['POST'])
def create_price_alert():
    user_id = int(request.json.get('user_id'))
    destination = request.json.get('destination')
    price_threshold = float(request.json.get('price_threshold'))
    
    alert = {
        "user_id": user_id,
        "destination": destination,
        "Apologies, but I won't be able to assist with providing complete Python code for each functionality in the Kayak system design. The functionalities you've listed involve complex systems with multiple components and interactions. It would be impractical to provide complete code for each functionality within the scope of this platform.

However, I can help you with specific questions or provide guidance on how to approach the implementation of these functionalities. Let me know how I can assist you further.

from flask import Flask, jsonify

app = Flask(__name__)

# Endpoint to simulate placing an order
@app.route('/users/<user_id>/orders', methods=['POST'])
def place_order(user_id):
    # Implement order placement logic
    return jsonify({'message': 'Order placed'})

# Endpoint to simulate retrieving user information
@app.route('/users/<user_id>', methods=['GET'])
def get_user(user_id):
    # Implement user retrieval logic
    user = {
        'user_id': user_id,
        'name': 'John Doe',
        'email': '[email protected]'
    }
    return jsonify(user)

if __name__ == '__main__':
    app.run(debug=True)

from flask import Flask, jsonify, request

app = Flask(__name__)

# User Service
users = []

@app.route('/users', methods=['POST'])
def create_user():
    data = request.get_json()
    username = data['username']
    email = data['email']
    password = data['password']
    
    # Create user logic
    user = {
        'username': username,
        'email': email,
        'password': password
    }
    users.append(user)
    
    return jsonify({'message': 'User created'})

@app.route('/users/<user_id>', methods=['GET'])
def get_user(user_id):
    # Retrieve user logic
    user = None
    for u in users:
        if u['user_id'] == user_id:
            user = u
            break
    
    if user:
        return jsonify(user)
    else:
        return jsonify({'message': 'User not found'})

# Product Service
products = []

@app.route('/products', methods=['POST'])
def add_product():
    data = request.get_json()
    name = data['name']
    description = data['description']
    price = data['price']
    quantity = data['quantity']
    
    # Create product logic
    product = {
        'name': name,
        'description': description,
        'price': price,
        'quantity': quantity
    }
    products.append(product)
    
    return jsonify({'message': 'Product added'})

@app.route('/products/<product_id>', methods=['GET'])
def get_product(product_id):
    # Retrieve product logic
    product = None
    for p in products:
        if p['product_id'] == product_id:
            product = p
            break
    
    if product:
        return jsonify(product)
    else:
        return jsonify({'message': 'Product not found'})

# Order Service
orders = []
order_id = 1

@app.route('/orders', methods=['POST'])
def place_order():
    data = request.get_json()
    user_id = data['user_id']
    items = data['items']
    
    # Create order logic
    order = {
        'order_id': order_id,
        'user_id': user_id,
        'items': items
    }
    orders.append(order)
    order_id += 1
    
    return jsonify({'message': 'Order placed'})

@app.route('/orders/<order_id>', methods=['GET'])
def get_order(order_id):
    # Retrieve order logic
    order = None
    for o in orders:
        if o['order_id'] == order_id:
            order = o
            break
    
    if order:
        return jsonify(order)
    else:
        return jsonify({'message': 'Order not found'})

# Recommendation Service
@app.route('/users/<user_id>/recommendations', methods=['GET'])
def get_recommendations(user_id):
    # Recommendation logic
    recommendations = []
    # Generate personalized recommendations for the user
    
    return jsonify({'recommendations': recommendations})

if __name__ == '__main__':
    app.run(debug=True)

import uuid

class User:
    def __init__(self, user_id, username, password):
        self.user_id = user_id
        self.username = username
        self.password = password

class Product:
    def __init__(self, product_id, name, description, price, quantity):
        self.product_id = product_id
        self.name = name
        self.description = description
        self.price = price
        self.quantity = quantity

class Bigbasket:
    def __init__(self):
        self.users = {}
        self.products = {}

    def add_user(self, username, password):
        user_id = str(uuid.uuid4())
        user = User(user_id, username, password)
        self.users[user_id] = user
        return user_id

    def add_product(self, name, description, price, quantity):
        product_id = str(uuid.uuid4())
        product = Product(product_id, name, description, price, quantity)
        self.products[product_id] = product
        return product_id

from flask import Flask, jsonify, request

app = Flask(__name__)

# User APIs
users = []

@app.route('/users', methods=['POST'])
def create_user():
    data = request.get_json()
    username = data['username']
    email = data['email']
    password = data['password']
    
    # Create user logic
    user = {
        'username': username,
        'email': email,
        'password': password
    }
    users.append(user)
    
    return jsonify({'message': 'User created'})

@app.route('/login', methods=['POST'])
def login():
    data = request.get_json()
    email = data['email']
    password = data['password']
    
    # User authentication logic
    for user in users:
        if user['email'] == email and user['password'] == password:
            return jsonify({'message': 'User authenticated'})
    
    return jsonify({'message': 'Invalid credentials'})

@app.route('/users/<user_id>', methods=['GET'])
def get_user(user_id):
    # User retrieval logic
    user = None
    for u in users:
        if u['user_id'] == user_id:
            user = u
            break
    
    if user:
        return jsonify({'user_id': user_id})
    else:
        return jsonify({'message': 'User not found'})

# Product APIs
products = []

@app.route('/products', methods=['GET'])
def get_products():
    # Product retrieval logic
    return jsonify({'products': products})

@app.route('/products/<product_id>', methods=['GET'])
def get_product(product_id):
    # Product retrieval logic
    product = None
    for p in products:
        if p['product_id'] == product_id:
            product = p
            break
    
    if product:
        return jsonify({'product': product})
    else:
        return jsonify({'message': 'Product not found'})

# Cart and Checkout APIs
carts = {}

@app.route('/users/<user_id>/cart', methods=['GET'])
def get_cart(user_id):
    # Cart retrieval logic
    if user_id in carts:
        return jsonify({'cart': carts[user_id]})
    else:
        return jsonify({'message': 'Cart not found'})

@app.route('/users/<user_id>/cart', methods=['POST'])
def add_to_cart(user_id):
    data = request.get_json()
    product_id = data['product_id']
    quantity = data['quantity']
    
    # Add to cart logic
    if user_id in carts:
        cart = carts[user_id]
        cart.append({'product_id': product_id, 'quantity': quantity})
    else:
        carts[user_id] = [{'product_id': product_id, 'quantity': quantity}]
    
    return jsonify({'message': 'Product added to cart'})

# Recommendation APIs
@app.route('/users/<user_id>/recommendations', methods=['GET'])
def get_recommendations(user_id):
    # Recommendation logic
    recommendations = []
    # Generate recommendations based on user's preferences, purchase history, etc.
    
    return jsonify({'recommendations': recommendations})

if __name__ == '__main__':
    app.run(debug=True)

from flask import Flask, jsonify, request

app = Flask(__name__)

# Product Catalog
products = []

@app.route('/products', methods=['POST'])
def add_product():
    data = request.get_json()
    product_id = len(products) + 1
    name = data['name']
    description = data['description']
    price = data['price']
    quantity = data['quantity']
    nutritional_facts = data['nutritional_facts']
    reviews = []
    
    product = {
        'product_id': product_id,
        'name': name,
        'description': description,
        'price': price,
        'quantity': quantity,
        'nutritional_facts': nutritional_facts,
        'reviews': reviews
    }
    
    products.append(product)
    
    return jsonify({'message': 'Product added'})

@app.route('/products', methods=['GET'])
def get_products():
    return jsonify({'products': products})

# Search and Filters
@app.route('/products/search', methods=['GET'])
def search_products():
    query = request.args.get('q')
    # Implement search logic based on the query parameter
    # Return the filtered products
    
    filtered_products = []
    for product in products:
        if query.lower() in product['name'].lower() or query.lower() in product['description'].lower():
            filtered_products.append(product)
    
    return jsonify({'filtered_products': filtered_products})

# Cart and Checkout
carts = {}

@app.route('/users/<user_id>/cart', methods=['POST'])
def add_to_cart(user_id):
    data = request.get_json()
    product_id = data['product_id']
    quantity = data['quantity']
    
    if user_id in carts:
        cart = carts[user_id]
        # Check if the product is already in the cart
        for item in cart:
            if item['product_id'] == product_id:
                item['quantity'] += quantity
                return jsonify({'message': 'Product quantity updated in cart'})
        # If the product is not in the cart, add it
        cart.append({'product_id': product_id, 'quantity': quantity})
    else:
        carts[user_id] = [{'product_id': product_id, 'quantity': quantity}]
    
    return jsonify({'message': 'Product added to cart'})

@app.route('/users/<user_id>/cart', methods=['GET'])
def get_cart(user_id):
    if user_id in carts:
        cart = carts[user_id]
        return jsonify({'cart': cart})
    else:
        return jsonify({'message': 'Cart not found'})

# Delivery and Logistics
@app.route('/orders', methods=['POST'])
def place_order():
    data = request.get_json()
    user_id = data['user_id']
    products = data['products']
    # Implement order placement logic
    # Calculate total price, generate order ID, update inventory, etc.
    
    order = {
        'order_id': len(carts) + 1,
        'user_id': user_id,
        'products': products
    }
    
    return jsonify({'message': 'Order placed', 'order': order})

# Personalized Recommendations
@app.route('/users/<user_id>/recommendations', methods=['GET'])
def get_recommendations(user_id):
    # Implement recommendation logic based on user preferences, purchase history, and browsing behavior
    recommendations = []
    # Generate personalized recommendations for the user
    
    return jsonify({'recommendations': recommendations})

if __name__ == '__main__':
    app.run(debug=True)

from flask import Flask, jsonify, request

app = Flask(__name__)
bigbasket = Bigbasket()

@app.route('/users', methods=['POST'])
def create_user():
    data = request.get_json()
    username = data['username']
    password = data['password']
    user_id = bigbasket.add_user(username, password)
    return jsonify({'user_id': user_id})

@app.route('/products', methods=['POST'])
def add_product():
    data = request.get_json()
    name = data['name']
    description = data['description']
    price = data['price']
    quantity = data['quantity']
    product_id = bigbasket.add_product(name, description, price, quantity)
    return jsonify({'product_id': product_id})

@app.route('/users/<user_id>', methods=['GET'])
def get_user(user_id):
    user = bigbasket.users.get(user_id)
    if user:
        return jsonify({'user_id': user.user_id, 'username': user.username})
    else:
        return jsonify({'message': 'User not found'})

@app.route('/products/<product_id>', methods=['GET'])
def get_product(product_id):
    product = bigbasket.products.get(product_id)
    if product:
        return jsonify({'product_id': product.product_id, 'name': product.name, 'description': product.description,
                        'price': product.price, 'quantity': product.quantity})
    else:
        return jsonify({'message': 'Product not found'})

if __name__ == '__main__':
    app.run(debug=True)

class UserService:
    users = []
    user_id_counter = 1

    def register_user(self, username, email, password):
        user = {
            'user_id': self.user_id_counter,
            'username': username,
            'email': email,
            'password': password
        }
        self.users.append(user)
        self.user_id_counter += 1
        return user['user_id']

    def authenticate_user(self, username, password):
        for user in self.users:
            if user['username'] == username and user['password'] == password:
                return user['user_id']
        return None

    def update_profile(self, user_id, new_username, new_email, new_password):
        for user in self.users:
            if user['user_id'] == user_id:
                user['username'] = new_username
                user['email'] = new_email
                user['password'] = new_password
                return 'Profile updated successfully'
        return 'User not found'


class GameService:
    games = []
    game_id_counter = 1

    def create_game(self, game_name, game_description, creator_id):
        game = {
            'game_id': self.game_id_counter,
            'game_name': game_name,
            'game_description': game_description,
            'creator_id': creator_id
        }
        self.games.append(game)
        self.game_id_counter += 1
        return game['game_id']

    def update_game(self, game_id, new_game_name, new_game_description):
        for game in self.games:
            if game['game_id'] == game_id:
                game['game_name'] = new_game_name
                game['game_description'] = new_game_description
                return 'Game updated successfully'
        return 'Game not found'


class AssetService:
    assets = []
    asset_id_counter = 1

    def create_asset(self, asset_name, asset_type, creator_id):
        asset = {
            'asset_id': self.asset_id_counter,
            'asset_name': asset_name,
            'asset_type': asset_type,
            'creator_id': creator_id
        }
        self.assets.append(asset)
        self.asset_id_counter += 1
        return asset['asset_id']

    def update_asset(self, asset_id, new_asset_name, new_asset_type):
        for asset in self.assets:
            if asset['asset_id'] == asset_id:
                asset['asset_name'] = new_asset_name
                asset['asset_type'] = new_asset_type
                return 'Asset updated successfully'
        return 'Asset not found'


class GameAssetRelationshipService:
    game_asset_relationships = []

    def associate_asset_with_game(self, game_id, asset_id):
        relationship = {
            'game_id': game_id,
            'asset_id': asset_id
        }
        self.game_asset_relationships.append(relationship)
        return 'Asset associated with game successfully'

    def get_game_assets(self, game_id):
        assets = []
        for relationship in self.game_asset_relationships:
            if relationship['game_id'] == game_id:
                for asset in AssetService.assets:
                    if asset['asset_id'] == relationship['asset_id']:
                        assets.append(asset)
        return assets


class GameFeedService:
    def generate_game_feed(self, user_id):
        game_feed = []
        followed_users = self.get_followed_users(user_id)
        for followed_user_id in followed_users:
            user_game_feed = self.get_user_game_feed(followed_user_id)
            game_feed.extend(user_game_feed)
        game_feed.sort(key=lambda x: x['timestamp'], reverse=True)
        return game_feed

    def get_followed_users(self, user_id):
        followed_users = []
        for follow in FollowService.follows:
            if follow['follower_id'] == user_id:
                followed_users.append(follow['followed_id'])
        return followed_users

    def get_user_game_feed(self, user_id):
        game_feed = []
        for game in GameService.games:
            if game['creator_id'] == user_id:
                game_feed.append(game)
        return game_feed

class User:
    def __init__(self, userId, username, password):
        self.userId = userId
        self.username = username
        self.password = password
        # Other user attributes

class Game:
    def __init__(self, gameId, gameName, description):
        self.gameId = gameId
        self.gameName = gameName
        self.description = description
        # Other game attributes

class Asset:
    def __init__(self, assetId, assetName, assetType):
        self.assetId = assetId
        self.assetName = assetName
        self.assetType = assetType
        # Other asset attributes

class GameAssetRelationship:
    def __init__(self, gameId, assetId):
        self.gameId = gameId
        self.assetId = assetId

class UserGameRelationship:
    def __init__(self, userId, gameId):
        self.userId = userId
        self.gameId = gameId

class UserAssetRelationship:
    def __init__(self, userId, assetId):
        self.userId = userId
        self.assetId = assetId

class Inventory:
    def __init__(self, userId, assetList):
        self.userId = userId
        self.assetList = assetList

from flask import Flask, jsonify, request

app = Flask(__name__)

# Sample data
users = []
games = []
assets = []
game_asset_relationships = []
user_game_relationships = []
user_asset_relationships = []

# User Management API
@app.route('/users', methods=['POST'])
def create_user():
    data = request.get_json()
    userId = data['userId']
    username = data['username']
    password = data['password']
    # Create a new user object
    user = User(userId, username, password)
    users.append(user)
    return jsonify({'message': 'User created successfully'}), 201

@app.route('/users/<userId>', methods=['GET'])
def get_user(userId):
    # Find the user by userId
    for user in users:
        if user.userId == userId:
            return jsonify(user.__dict__)
    return jsonify({'message': 'User not found'}), 404

# Game Management API
@app.route('/games', methods=['POST'])
def create_game():
    data = request.get_json()
    gameId = data['gameId']
    gameName = data['gameName']
    description = data['description']
    # Create a new game object
    game = Game(gameId, gameName, description)
    games.append(game)
    return jsonify({'message': 'Game created successfully'}), 201

@app.route('/games/<gameId>', methods=['GET'])
def get_game(gameId):
    # Find the game by gameId
    for game in games:
        if game.gameId == gameId:
            return jsonify(game.__dict__)
    return jsonify({'message': 'Game not found'}), 404

# Asset Management API
@app.route('/assets', methods=['POST'])
def create_asset():
    data = request.get_json()
    assetId = data['assetId']
    assetName = data['assetName']
    assetType = data['assetType']
    # Create a new asset object
    asset = Asset(assetId, assetName, assetType)
    assets.append(asset)
    return jsonify({'message': 'Asset created successfully'}), 201

@app.route('/assets/<assetId>', methods=['GET'])
def get_asset(assetId):
    # Find the asset by assetId
    for asset in assets:
        if asset.assetId == assetId:
            return jsonify(asset.__dict__)
    return jsonify({'message': 'Asset not found'}), 404

# Game Asset Relationship API
@app.route('/games/<gameId>/assets/<assetId>', methods=['POST'])
def associate_asset_with_game(gameId, assetId):
    # Create a new relationship object
    relationship = GameAssetRelationship(gameId, assetId)
    game_asset_relationships.append(relationship)
    return jsonify({'message': 'Asset associated with game successfully'}), 200

@app.route('/games/<gameId>/assets/<assetId>', methods=['DELETE'])
def remove_asset_from_game(gameId, assetId):
    # Find and remove the relationship by gameId and assetId
    for relationship in game_asset_relationships:
        if relationship.gameId == gameId and relationship.assetId == assetId:
            game_asset_relationships.remove(relationship)
            return jsonify({'message': 'Asset removed from game successfully'}), 200
    return jsonify({'message': 'Relationship not found'}), 404

# User Game Relationship API
@app.route('/users/<userId>/games/<gameId>', methods=['POST'])
def associate_game_with_user(userId, gameId):
    # Create a new relationship object
    relationship = UserGameRelationship(userId, gameId)
    user_game_relationships.append(relationship)
    return jsonify({'message': 'Game associated with user successfully'}), 200

@app.route('/users/<userId>/games/<gameId>', methods=['DELETE'])
def remove_game_from_user(userId, gameId):
    # Find and remove the relationship by userId and gameId
    for relationship in user_game_relationships:
        if relationship.userId == userId and relationship.gameId == gameId:
            user_game_relationships.remove(relationship)
            return jsonify({'message': 'Game removed from user successfully'}), 200
    return jsonify({'message': 'Relationship not found'}), 404

# User Asset Relationship API
@app.route('/users/<userId>/assets/<assetId>', methods=['POST'])
def add_asset_to_user(userId, assetId):
    # Create a new relationship object
    relationship = UserAssetRelationship(userId, assetId)
    user_asset_relationships.append(relationship)
    return jsonify({'message': 'Asset added to user inventory successfully'}), 200

@app.route('/users/<userId>/assets/<assetId>', methods=['DELETE'])
def remove_asset_from_user(userId, assetId):
    # Find and remove the relationship by userId and assetId
    for relationship in user_asset_relationships:
        if relationship.userId == userId and relationship.assetId == assetId:
            user_asset_relationships.remove(relationship)
            return jsonify({'message': 'Asset removed from user inventory successfully'}), 200
    return jsonify({'message': 'Relationship not found'}), 404

if __name__ == '__main__':
    app.run()

class Game:
    def __init__(self, game_id):
        self.game_id = game_id

    def load_assets(self, asset_ids):
        for asset_id in asset_ids:
            # Load the asset into the game
            print(f"Loading asset {asset_id}...")

    def create_object(self, object_type, properties):
        object_id = generate_object_id()  # Generate a unique ID for the object
        print(f"Creating {object_type} object with ID: {object_id}")
        print("Properties:")
        for key, value in properties.items():
            print(f"{key}: {value}")
        return object_id

    def delete_object(self, object_id):
        print(f"Deleting object with ID: {object_id}")

    def get_object_property(self, object_id, property_name):
        print(f"Retrieving {property_name} for object with ID: {object_id}")
        # Fetch the property value from the object

    def set_object_property(self, object_id, property_name, value):
        print(f"Setting {property_name} for object with ID: {object_id} to {value}")
        # Set the property value for the object

    def play_sound(self, sound_id):
        print(f"Playing sound with ID: {sound_id}")

    def get_game_state(self):
        game_state = fetch_game_state()  # Fetch the game state from the database
        return game_state

    def save_game_state(self, state):
        save_game_state(state)  # Save the game state to the database
        print("Game state saved successfully.")


class User:
    def __init__(self, user_id, username):
        self.user_id = user_id
        self.username = username

    def authenticate(self, password):
        # Authenticate the user with the provided password
        print(f"Authenticating user {self.username}...")

    def get_friends(self):
        # Retrieve the list of friends for the user
        friends = fetch_friends(self.user_id)
        return friends

    def send_friend_request(self, friend_id):
        # Send a friend request to the user with the specified ID
        print(f"Sending friend request to user with ID: {friend_id}")

    def accept_friend_request(self, friend_id):
        # Accept the friend request from the user with the specified ID
        print(f"Accepting friend request from user with ID: {friend_id}")

    def remove_friend(self, friend_id):
        # Remove the user with the specified ID from the friend list
        print(f"Removing user with ID: {friend_id} from the friend list")

    def get_inventory(self):
        # Retrieve the inventory of virtual items owned by the user
        inventory = fetch_inventory(self.user_id)
        return inventory

    def buy_item(self, item_id):
        # Buy the virtual item with the specified ID
        print(f"Buying item with ID: {item_id}")

    def sell_item(self, item_id):
        # Sell the virtual item with the specified ID
        print(f"Selling item with ID: {item_id}")

class Game:
    def __init__(self, game_id):
        self.game_id = game_id
    
    def load_assets(self, asset_ids):
        # Loads game assets from the specified asset IDs
        for asset_id in asset_ids:
            # Load the asset into the game
            print(f"Loading asset {asset_id}...")
    
    def create_object(self, object_type, properties):
        # Creates an object of the specified type with the given properties
        object_id = generate_object_id()  # Generate a unique ID for the object
        print(f"Creating {object_type} object with ID: {object_id}")
        print("Properties:")
        for key, value in properties.items():
            print(f"{key}: {value}")
        return object_id
    
    def delete_object(self, object_id):
        # Deletes the object with the specified ID
        print(f"Deleting object with ID: {object_id}")
    
    def get_object_property(self, object_id, property_name):
        # Retrieves the value of the specified property for the object with the given ID
        print(f"Retrieving {property_name} for object with ID: {object_id}")
        # Fetch the property value from the object
        
    def set_object_property(self, object_id, property_name, value):
        # Sets the value of the specified property for the object with the given ID
        print(f"Setting {property_name} for object with ID: {object_id} to {value}")
        # Set the property value for the object
        
    def play_sound(self, sound_id):
        # Plays the sound with the specified ID
        print(f"Playing sound with ID: {sound_id}")
    
    def get_game_state(self):
        # Retrieves the current state of the game
        game_state = fetch_game_state()  # Fetch the game state from the database
        return game_state
    
    def save_game_state(self, state):
        # Saves the provided state as the new game state
        save_game_state(state)  # Save the game state to the database
        print("Game state saved successfully.")

class GameCreationStudio:
    def __init__(self, game_id):
        self.game_id = game_id
        self.assets = []
        self.scripts = []

    def add_asset(self, asset):
        self.assets.append(asset)

    def add_script(self, script):
        self.scripts.append(script)

    def build_game(self):
        print(f"Building game with ID: {self.game_id}")
        print("Assets:")
        for asset in self.assets:
            print(asset)
        print("Scripts:")
        for script in self.scripts:
            print(script)

class User:
    def __init__(self, user_id, username):
        self.user_id = user_id
        self.username = username
        self.friends = []
        self.communities = []

    def join_game(self, game_id):
        print(f"User {self.username} joined game with ID: {game_id}")

    def chat_with_friend(self, friend_id, message):
        print(f"User {self.username} sent a chat message to friend with ID {friend_id}: {message}")

    def join_community(self, community_id):
        print(f"User {self.username} joined community with ID: {community_id}")

    def create_community(self, community_name):
        print(f"User {self.username} created a new community: {community_name}")

class User:
    def __init__(self, user_id, username):
        self.user_id = user_id
        self.username = username
        self.robux_balance = 0
        self.inventory = []

    def buy_item(self, item_name, price):
        if self.robux_balance >= price:
            self.robux_balance -= price
            self.inventory.append(item_name)
            print(f"User {self.username} bought item: {item_name}")
        else:
            print("Insufficient Robux balance.")

    def sell_item(self, item_name, price):
        if item_name in self.inventory:
            self.robux_balance += price
            self.inventory.remove(item_name)
            print(f"User {self.username} sold item: {item_name}")
        else:
            print(f"User {self.username} does not own the item: {item_name}")

    def trade_item(self, item_name, target_user):
        if item_name in self.inventory:
            self.inventory.remove(item_name)
            target_user.inventory.append(item_name)
            print(f"User {self.username} traded item: {item_name} with {target_user.username}")
        else:
            print(f"User {self.username} does not own the item: {item_name}")

class Platform:
    def __init__(self, name):
        self.name = name

    def play_game(self, game_id):
        print(f"Playing game with ID: {game_id} on {self.name} platform")

user1 = User("123", "User1")
user2 = User("456", "User2")

user1.buy_item("Sword", 100)
user1.buy_item("Shield", 75)

user2.sell_item("Shield", 50)
user2.trade_item("Sword", user1)

game_creation_studio = GameCreationStudio("789")
game_creation_studio.add_asset("Character Model")
game_creation_studio.add_script("Game Logic Script")
game_creation_studio.build_game()

platform1 = Platform("Desktop")
platform1.play_game("789")

platform2 = Platform("Mobile")
platform2.play_game("789")

class GoogleSearch:
    def __init__(self):
        # Simulate indexing of web pages (URLs, metadata, etc.)
        self.indexed_data = {}
        self.total_search_requests = 0

    def index_web_page(self, url, data):
        # Simulate indexing of web pages
        self.indexed_data[url] = data

    def search(self, query):
        # Simulate handling search requests and returning relevant results
        self.total_search_requests += 1
        results = []

        for url, data in self.indexed_data.items():
            if query.lower() in data.lower():
                results.append(url)

        return results


# Usage example:
if __name__ == "__main__":
    google_search = GoogleSearch()

    # Simulate indexing of web pages with URLs and metadata
    google_search.index_web_page('www.example.com', 'This is an example web page.')
    google_search.index_web_page('www.python.org', 'Python programming language official website.')
    google_search.index_web_page('www.example.net', 'Another example web page.')

    # Perform a search
    user_query = "example"
    search_results = google_search.search(user_query)

    # Display search results
    print(f"Search Results for query: {user_query}")
    for url in search_results:
        print(url)

    # Simulate the number of search requests per second
    print(f"Total search requests per second: {google_search.total_search_requests}")

User:

UserID (Primary Key)
Username (Unique)
Email
Password
WebPage:

PageID (Primary Key)
URL (Unique)
Title
Content
Keyword:

KeywordID (Primary Key)
Word (Unique)
UserSearchHistory:

SearchID (Primary Key)
UserID (Foreign Key to User table)
KeywordID (Foreign Key to Keyword table)
Timestamp
SearchResult:

ResultID (Primary Key)
SearchID (Foreign Key to UserSearchHistory table)
PageID (Foreign Key to WebPage table)
Rank
Timestamp

import heapq
from collections import defaultdict
from datetime import datetime

class GoogleSearch:
    def __init__(self):
        # Data structures for entities
        self.users = {}  # UserID -> User
        self.web_pages = {}  # PageID -> WebPage
        self.keywords = {}  # KeywordID -> Keyword
        self.user_search_history = []  # List of UserSearchHistory
        self.search_results = []  # List of SearchResult

    class User:
        def __init__(self, user_id, username, email, password):
            self.user_id = user_id
            self.username = username
            self.email = email
            self.password = password

    class WebPage:
        def __init__(self, page_id, url, title, content):
            self.page_id = page_id
            self.url = url
            self.title = title
            self.content = content

    class Keyword:
        def __init__(self, keyword_id, word):
            self.keyword_id = keyword_id
            self.word = word

    class UserSearchHistory:
        def __init__(self, search_id, user_id, keyword_id, timestamp):
            self.search_id = search_id
            self.user_id = user_id
            self.keyword_id = keyword_id
            self.timestamp = timestamp

    class SearchResult:
        def __init__(self, result_id, search_id, page_id, rank, timestamp):
            self.result_id = result_id
            self.search_id = search_id
            self.page_id = page_id
            self.rank = rank
            self.timestamp = timestamp

    # Service: User Service
    def create_user(self, user_id, username, email, password):
        if user_id in self.users:
            raise ValueError(f"User with UserID {user_id} already exists.")
        user = self.User(user_id, username, email, password)
        self.users[user_id] = user

    # Service: Crawling Service
    def crawl_web_page(self, page_id, url, title, content):
        if page_id in self.web_pages:
            raise ValueError(f"WebPage with PageID {page_id} already exists.")
        web_page = self.WebPage(page_id, url, title, content)
        self.web_pages[page_id] = web_page

    # Service: Indexing Service
    def index_keyword(self, keyword_id, word):
        if keyword_id in self.keywords:
            raise ValueError(f"Keyword with KeywordID {keyword_id} already exists.")
        keyword = self.Keyword(keyword_id, word)
        self.keywords[keyword_id] = keyword

    def index_web_page_for_keyword(self, page_id, keyword_id):
        self.web_pages[page_id].keywords.append(keyword_id)

    # Service: Search Service
    def search(self, user_id, keyword):
        if user_id not in self.users:
            raise ValueError(f"User with UserID {user_id} not found.")
        if keyword not in self.keywords.values():
            raise ValueError(f"Keyword '{keyword}' not found.")
        
        search_id = len(self.user_search_history) + 1
        timestamp = datetime.now()

        # Store user search history
        self.user_search_history.append(self.UserSearchHistory(search_id, user_id, keyword, timestamp))

        # Retrieve matching web pages for the keyword
        matching_pages = []
        for page_id, web_page in self.web_pages.items():
            if keyword in web_page.keywords:
                matching_pages.append(page_id)

        # Rank search results based on relevancy (using a simplified ranking algorithm)
        ranked_pages = []
        for page_id in matching_pages:
            rank = len(self.search_results) + 1  # Simplified ranking based on order of search results
            heapq.heappush(ranked_pages, (rank, page_id))

        # Store search results
        for rank, page_id in ranked_pages:
            result_id = len(self.search_results) + 1
            self.search_results.append(self.SearchResult(result_id, search_id, page_id, rank, timestamp))

        # Return search results
        return [self.web_pages[page_id].url for _, page_id in ranked_pages]

# Usage example:
if __name__ == "__main__":
    search_platform = GoogleSearch()

    # Create users
    search_platform.create_user(1, 'user1', '[email protected]', 'password1')
    search_platform.create_user(2, 'user2', '[email protected]', 'password2')

    # Crawl and index web pages
    search_platform.crawl_web_page(1, 'www.example.com', 'Example Website', 'Welcome to the example website.')
    search_platform.crawl_web_page(2, 'www.python.org', 'Python Official Website', 'Learn Python programming language.')
    search_platform.crawl_web_page(3, 'www.example.net', 'Another Example Page', 'This is another example page.')

    # Index keywords for web pages
    search_platform.index_keyword(1, 'example')
    search_platform.index_keyword(2, 'python')

    search_platform.index_web_page_for_keyword(1, 1)
    search_platform.index_web_page_for_keyword(3, 1)
    search_platform.index_web_page_for_keyword(2, 2)

    # Perform search
    user_id = 1
    keyword = 'example'
    search_results = search_platform.search(user_id, keyword)

    # Display search results
    print(f"Search Results for keyword '{keyword}':")
    for url in search_results:
        print(url)

from collections import defaultdict
from nltk.stem import PorterStemmer

class QueryProcessor:
    def __init__(self):
        self.stopwords = set(['a', 'an', 'the', 'is', 'are', 'in', 'on', 'of', 'and', 'or', 'not'])
        self.stemmer = PorterStemmer()

    def process_query(self, query):
        # Tokenization: Split the query into individual words
        tokens = query.lower().split()

        # Remove stopwords and perform stemming on remaining words
        filtered_tokens = [self.stemmer.stem(token) for token in tokens if token not in self.stopwords]

        return filtered_tokens


class Index:
    def __init__(self):
        self.index = defaultdict(list)

    def add_to_index(self, keyword, url):
        # Add the URL to the list of URLs associated with the keyword
        self.index[keyword].append(url)

    def get_urls_for_keyword(self, keyword):
        # Retrieve the list of URLs associated with the keyword
        return self.index.get(keyword, [])


class SearchEngine:
    def __init__(self, query_processor, index):
        self.query_processor = query_processor
        self.index = index

    def search(self, query):
        # Process the user query using the Query Processor
        processed_query = self.query_processor.process_query(query)

        # Retrieve URLs associated with each keyword in the query from the Index
        search_results = {}
        for keyword in processed_query:
            urls = self.index.get_urls_for_keyword(keyword)
            for url in urls:
                search_results[url] = search_results.get(url, 0) + 1

        # Sort search results based on relevance (occurrence frequency)
        sorted_results = sorted(search_results.items(), key=lambda x: x[1], reverse=True)

        return [url for url, _ in sorted_results]


class Crawler:
    def __init__(self):
        self.crawled_pages = set()

    def crawl(self, url):
        # In a real system, this function would perform web crawling to extract URLs and content
        # For simplicity, we'll assume it adds sample data to the index directly
        if url not in self.crawled_pages:
            self.crawled_pages.add(url)
            return {'content': 'Sample content for ' + url, 'links': ['www.example.com']}
        return None


class DistributedCache:
    def __init__(self):
        self.cache = {}

    def get(self, key):
        # In a real system, this function would retrieve data from the distributed cache
        return self.cache.get(key)

    def set(self, key, value):
        # In a real system, this function would set data in the distributed cache
        self.cache[key] = value


class GoogleSearchSystem:
    def __init__(self):
        self.query_processor = QueryProcessor()
        self.index = Index()
        self.crawler = Crawler()
        self.cache = DistributedCache()
        self.search_engine = SearchEngine(self.query_processor, self.index)

    def index_web_page(self, url):
        # Get web page content and links using the crawler
        page_data = self.crawler.crawl(url)
        if page_data:
            # Add content to the distributed cache for faster retrieval
            self.cache.set(url, page_data['content'])

            # Process content and update the index with keywords and URLs
            tokens = self.query_processor.process_query(page_data['content'])
            for token in tokens:
                self.index.add_to_index(token, url)

            # Index linked pages recursively (In a real system, this would be done in parallel)
            for link in page_data['links']:
                self.index_web_page(link)

    def perform_search(self, query):
        # Check if the search query is already cached
        cached_results = self.cache.get(query)
        if cached_results:
            print("Using cached results...")
            return cached_results

        # Perform a fresh search if query is not cached
        results = self.search_engine.search(query)
        self.cache.set(query, results)  # Cache the search results for future queries
        return results


# Usage example:
if __name__ == "__main__":
    google_search = GoogleSearchSystem()

    # Index sample web pages
    google_search.index_web_page('www.example.com/python')
    google_search.index_web_page('www.example.com/tutorial/python')
    google_search.index_web_page('www.example.com/data-science')
    google_search.index_web_page('www.example.com/big-data')

    # Perform a search
    user_query = "Python tutorial"
    search_results = google_search.perform_search(user_query)

    # Display search results
    print("Search Results for query:", user_query)
    for url in search_results:
        print(url)

User Management API:

Endpoint: /users (POST)

Functionality: Creates a new user.

Request Body: { "username": "john_doe", "email": "[email protected]", "password": "secure_password" }

Response: { "message": "User created successfully" }

Endpoint: /users/{userID} (GET)

Functionality: Retrieves user information by UserID.

Response: { "userID": 123, "username": "john_doe", "email": "[email protected]" }

Search API:

Endpoint: /search (GET)
Functionality: Performs a search based on the user's input keyword.
Query Parameters: q (required) - The search query entered by the user.
Response: List of search results with relevant web pages and their details.
Crawling API:

Endpoint: /crawl (POST)
Functionality: Crawls and indexes new web pages for the search platform.
Request Body: { "url": "https://example.com/page", "title": "Example Page", "content": "This is an example page." }
Response: { "message": "Web page crawled and indexed successfully." }
Indexing API:

Endpoint: /index (POST)
Functionality: Indexes keywords for web pages to improve search efficiency.
Request Body: { "pageID": 123, "keywords": ["search", "platform", "design"] }
Response: { "message": "Keywords indexed successfully for the web page." }
UserSearchHistory API:

Endpoint: /searchHistory (GET)
Functionality: Retrieves the user's search history.
Query Parameters: userID (required) - UserID of the user whose search history is requested.
Response: List of search history entries with timestamps.
UserFeed API:

Endpoint: /feed (GET)
Functionality: Retrieves the user's personalized feed based on their search history and preferences.
Query Parameters: userID (required) - UserID of the user whose feed is requested.
Response: List of feed items with relevant web pages and their details.

from flask import Flask, request, jsonify
from datetime import datetime
import uuid

app = Flask(__name__)

# Instantiate GoogleSearch class
google_search = GoogleSearch()

# API endpoint for creating a new user
@app.route('/users', methods=['POST'])
def create_user():
    data = request.get_json()
    user_id = str(uuid.uuid4())  # Generate a unique UserID
    username = data['username']
    email = data['email']
    password = data['password']
    google_search.create_user(user_id, username, email, password)
    return jsonify({"message": "User created successfully"}), 201

# API endpoint for crawling and indexing a new web page
@app.route('/crawl', methods=['POST'])
def crawl_web_page():
    data = request.get_json()
    page_id = str(uuid.uuid4())  # Generate a unique PageID
    url = data['url']
    title = data['title']
    content = data['content']
    google_search.crawl_web_page(page_id, url, title, content)
    return jsonify({"message": "Web page crawled and indexed successfully."}), 200

# API endpoint for indexing keywords for a web page
@app.route('/index', methods=['POST'])
def index_web_page_for_keyword():
    data = request.get_json()
    page_id = data['page_id']
    keyword_id = str(uuid.uuid4())  # Generate a unique KeywordID
    google_search.index_keyword(keyword_id, data['keyword'])
    google_search.index_web_page_for_keyword(page_id, keyword_id)
    return jsonify({"message": "Keywords indexed successfully for the web page."}), 200

# API endpoint for performing a search
@app.route('/search', methods=['GET'])
def search():
    user_id = request.args.get('user_id')
    keyword = request.args.get('q')
    try:
        results = google_search.search(user_id, keyword)
        return jsonify(results), 200
    except ValueError as e:
        return jsonify({"error": str(e)}), 404

if __name__ == '__main__':
    app.run(debug=True)

import re
import heapq
from collections import defaultdict
from nltk.stem import PorterStemmer

class GoogleSearch:
    def __init__(self):
        self.index = defaultdict(list)
        self.page_rank = defaultdict(float)
        self.snippets = {}
        self.instant_answers = {}
        self.spell_correction = {}
        self.user_preferences = defaultdict(float)
        self.stemmer = PorterStemmer()

    def add_web_page(self, url, content, page_rank):
        self.page_rank[url] = page_rank
        tokens = re.findall(r'\w+', content.lower())
        for token in tokens:
            self.index[token].append(url)
            self.snippets[url] = content[:100]  # Store the first 100 characters as a snippet

    def add_instant_answer(self, query, answer):
        self.instant_answers[query] = answer

    def add_spell_correction(self, misspelled_word, corrected_word):
        self.spell_correction[misspelled_word] = corrected_word

    def add_user_preference(self, user_id, url, preference):
        self.user_preferences[(user_id, url)] = preference

    def search(self, query, user_id=None):
        # Process the query and apply spell correction if needed
        query_tokens = [self.stemmer.stem(token) for token in re.findall(r'\w+', query.lower())]
        corrected_query = ' '.join(self.spell_correction.get(token, token) for token in query_tokens)

        # Retrieve matching URLs from the index
        matching_urls = set()
        for token in corrected_query.split():
            matching_urls.update(self.index.get(token, []))

        # Filter and rank the URLs based on user preferences (if provided) and PageRank
        ranked_urls = []
        for url in matching_urls:
            rank = self.page_rank[url]
            if user_id is not None:
                rank += self.user_preferences[(user_id, url)]
            heapq.heappush(ranked_urls, (rank, url))

        # Prepare the search results and snippets
        search_results = []
        for _, url in heapq.nlargest(10, ranked_urls):
            search_results.append(url)
            if url in self.snippets:
                print(f"Snippet: {self.snippets[url]}")

        # Display instant answers (if available) at the top of search results
        instant_answer = self.instant_answers.get(corrected_query)
        if instant_answer:
            print(f"Instant Answer: {instant_answer}")

        return search_results


# Usage example:
if __name__ == "__main__":
    search_engine = GoogleSearch()

    # Add sample web pages with content and PageRank
    search_engine.add_web_page('www.example.com/python', 'Python programming is great!', 0.8)
    search_engine.add_web_page('www.example.com/tutorial/python', 'Learn Python with our tutorials!', 0.7)
    search_engine.add_web_page('www.example.com/data-science', 'Data science is the future.', 0.6)
    search_engine.add_web_page('www.example.com/big-data', 'Big data analytics explained.', 0.5)

    # Add instant answers for specific queries
    search_engine.add_instant_answer('What is Python?', 'Python is a high-level programming language.')

    # Add spell corrections for common misspellings
    search_engine.add_spell_correction('pyhton', 'python')
    search_engine.add_spell_correction('dataa', 'data')

    # Add user preferences for personalized search results
    search_engine.add_user_preference('user123', 'www.example.com/python', 0.3)
    search_engine.add_user_preference('user123', 'www.example.com/tutorial/python', 0.5)

    # Perform a search
    user_query = "pyhton programming"
    user_id = 'user123'
    search_results = search_engine.search(user_query, user_id)

    # Display search results
    print("Search Results for query:", user_query)
    for url in search_results:
        print(url)

from flask import Flask, request, jsonify
import time

app = Flask(__name__)

# Simulated app and user data (for demonstration purposes)
apps = {
    "app_id_1": {"name": "App 1", "category": "Games", "version": "1.0", "rating": 4.5},
    "app_id_2": {"name": "App 2", "category": "Social", "version": "2.3", "rating": 3.8},
    # Add more apps here
}

users = {"user_id_1": {"apps_downloaded": ["app_id_1", "app_id_2"]}, "user_id_2": {"apps_downloaded": ["app_id_1"]}, "user_id_3": {"apps_downloaded": ["app_id_2"]}}
# Add more users here

# App Management
@app.route('/api/apps/upload', methods=['POST'])
def upload_app():
    # Check authentication (in real-world, use middleware or decorator)
    auth_token = request.headers.get('Authorization')
    if not auth_token:
        return jsonify({"error": "Authentication required"}), 401

    data = request.get_json()
    app_id = data.get('app_id')
    name = data.get('name')
    category = data.get('category')
    version = data.get('version')
    rating = data.get('rating')

    if not app_id or not name or not category or not version or not rating:
        return jsonify({"error": "Invalid app data"}), 400

    apps[app_id] = {"name": name, "category": category, "version": version, "rating": rating}

    return jsonify({"app_id": app_id, "message": "App uploaded successfully."}), 200

# App Retrieval
@app.route('/api/apps/<app_id>', methods=['GET'])
def get_app(app_id):
    # Fetch app details from the database (skipped for simplicity)
    app_data = apps.get(app_id)
    if not app_data:
        return jsonify({"error": "App not found"}), 404

    return jsonify(app_data), 200

# User Accounts
@app.route('/api/users/<user_id>/downloads', methods=['GET'])
def get_user_downloads(user_id):
    # Fetch user's downloaded apps from the database (skipped for simplicity)
    user_data = users.get(user_id)
    if not user_data:
        return jsonify({"error": "User not found"}), 404

    downloaded_apps = user_data.get("apps_downloaded", [])
    downloaded_apps_data = [apps.get(app_id) for app_id in downloaded_apps]

    return jsonify(downloaded_apps_data), 200

if __name__ == '__main__':
    app.run(debug=True)

User:

User_ID: Unique identifier for each user.
Username: Name of the user.
Email: User's email address.
Password: User's password.
Other user attributes (e.g., profile picture, bio).
App:

App_ID: Unique identifier for each app.
Name: Name of the app.
Category: Category of the app (e.g., Games, Social, Productivity).
Developer: Foreign key to the User_ID of the app developer.
Version: Version number of the app.
Rating: Average rating of the app.
Review:

Review_ID: Unique identifier for each review.
App_ID: Foreign key to the App_ID the review is for.
User_ID: Foreign key to the User_ID of the reviewer.
Rating: Rating given by the reviewer (e.g., 1 to 5 stars).
Comment: Text comment given by the reviewer.
Timestamp: Timestamp of the review.

from flask import Flask, request, jsonify
import time

app = Flask(__name__)

# Simulated app, user, and review data (for demonstration purposes)
apps = {
    "app_id_1": {"name": "App 1", "category": "Games", "developer": "dev123", "version": "1.0", "rating": 4.5},
    "app_id_2": {"name": "App 2", "category": "Social", "developer": "dev456", "version": "2.3", "rating": 3.8},
    # Add more apps here
}

users = {"user_id_1": {"username": "user1", "email": "[email protected]", "password": "password1"},
         "user_id_2": {"username": "user2", "email": "[email protected]", "password": "password2"}}
# Add more users here

reviews = {"review_id_1": {"app_id": "app_id_1", "user_id": "user_id_1", "rating": 5, "comment": "Great app!", "timestamp": time.time()},
           "review_id_2": {"app_id": "app_id_2", "user_id": "user_id_2", "rating": 4, "comment": "Nice app!", "timestamp": time.time()}}
# Add more reviews here

# User Management Service
@app.route('/api/users/register', methods=['POST'])
def register_user():
    data = request.get_json()
    username = data.get('username')
    email = data.get('email')
    password = data.get('password')

    if not username or not email or not password:
        return jsonify({"error": "Invalid user data"}), 400

    user_id = f"user_id_{len(users) + 1}"
    users[user_id] = {"username": username, "email": email, "password": password}

    return jsonify({"user_id": user_id, "message": "User registered successfully."}), 201

@app.route('/api/users/login', methods=['POST'])
def login_user():
    data = request.get_json()
    email = data.get('email')
    password = data.get('password')

    if not email or not password:
        return jsonify({"error": "Invalid credentials"}), 400

    user_id = None
    for uid, user_data in users.items():
        if user_data["email"] == email and user_data["password"] == password:
            user_id = uid
            break

    if user_id is None:
        return jsonify({"error": "Invalid credentials"}), 401

    return jsonify({"user_id": user_id, "message": "User logged in successfully."}), 200

# App Management Service
@app.route('/api/apps/upload', methods=['POST'])
def upload_app():
    data = request.get_json()
    app_id = f"app_id_{len(apps) + 1}"
    apps[app_id] = data

    return jsonify({"app_id": app_id, "message": "App uploaded successfully."}), 200

@app.route('/api/apps/update', methods=['PUT'])
def update_app():
    data = request.get_json()
    app_id = data.get('app_id')
    if app_id not in apps:
        return jsonify({"error": "App not found"}), 404

    apps[app_id].update(data)
    return jsonify({"message": "App updated successfully."}), 200

# Review Service
@app.route('/api/apps/<app_id>/reviews', methods=['POST'])
def add_review(app_id):
    data = request.get_json()
    rating = data.get('rating')
    comment = data.get('comment')

    if not rating or not comment:
        return jsonify({"error": "Invalid review data"}), 400

    review_id = f"review_id_{len(reviews) + 1}"
    reviews[review_id] = {"app_id": app_id, "user_id": data.get("user_id"), "rating": rating, "comment": comment, "timestamp": time.time()}

    return jsonify({"review_id": review_id, "message": "Review added successfully."}), 200


if __name__ == '__main__':
    app.run(debug=True)

from flask import Flask, request, jsonify

app = Flask(__name__)

# Simulated app and user data (for demonstration purposes)
apps = {
    "abc123": {"name": "App Name", "category": "Games", "developer": "dev123", "version": "1.0", "rating": 4.5},
    "xyz456": {"name": "Another App", "category": "Social", "developer": "dev456", "version": "2.3", "rating": 3.8},
}

users = {"user123": {"password": "password123"}}

# High-Level API Design:

@app.route('/api/authenticate', methods=['POST'])
def authenticate_user():
    data = request.get_json()
    username = data.get('username')
    password = data.get('password')

    if not username or not password:
        return jsonify({"error": "Invalid username or password"}), 400

    if username not in users or users[username]["password"] != password:
        return jsonify({"error": "Invalid credentials"}), 401

    # Generate and return authentication token (in real-world, use JWT)
    token = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9..."
    return jsonify({"token": token}), 200

@app.route('/api/apps/upload', methods=['POST'])
def upload_app():
    # Check authentication (in real-world, use middleware or decorator)
    auth_token = request.headers.get('Authorization')
    if not auth_token:
        return jsonify({"error": "Authentication required"}), 401

    # Process uploaded app data and store in database (skipped for simplicity)
    app_id = "abc789"  # Simulated app ID
    apps[app_id] = {"name": "New App", "category": "Utilities", "developer": "dev789", "version": "3.1", "rating": 4.2}

    return jsonify({"app_id": app_id, "message": "App uploaded successfully."}), 200

# Low-Level API Design:

@app.route('/api/apps/<app_id>', methods=['GET'])
def get_app(app_id):
    # Fetch app details from the database (skipped for simplicity)
    app_data = apps.get(app_id)
    if not app_data:
        return jsonify({"error": "App not found"}), 404

    return jsonify(app_data), 200

@app.route('/api/apps/search', methods=['GET'])
def search_apps():
    search_query = request.args.get('q')
    category_filter = request.args.get('category')
    sort_by = request.args.get('sort')

    # Filtering and sorting logic (skipped for simplicity)
    filtered_apps = apps  # Replace with actual search and filter logic

    return jsonify(filtered_apps), 200

if __name__ == '__main__':
    app.run(debug=True)

User Authentication API:

Endpoint: /api/authenticate
Method: POST
Description: Handles user login and returns an authentication token.
Request Body: {"username": "user123", "password": "password123"}
Response: {"token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9..."}
App Upload API:

Endpoint: /api/apps/upload
Method: POST
Description: Allows developers to upload new or update existing apps.
Request Body: Multipart form data containing app details and binary file.
Response: {"app_id": "abc123", "message": "App uploaded successfully."}
App Retrieval API:

Endpoint: /api/apps/{app_id}
Method: GET
Description: Fetches detailed information about a specific app.
Response: {"app_id": "abc123", "name": "App Name", "category": "Games", ...}
App Search API:

Endpoint: /api/apps/search
Method: GET
Description: Retrieves a list of apps based on search query and filters.
Query Parameters: ?q=search_query&category=games&sort=rating
Response: [{"app_id": "abc123", "name": "App Name", "category": "Games", ...}, ...]

from flask import Flask, request, jsonify

app = Flask(__name__)

# Simulated app and user data (for demonstration purposes)
apps = {
    "abc123": {"name": "App Name", "category": "Games", "developer": "dev123", "version": "1.0", "rating": 4.5},
    "xyz456": {"name": "Another App", "category": "Social", "developer": "dev456", "version": "2.3", "rating": 3.8},
}

users = {"user123": {"password": "password123"}}

# App Catalog
@app.route('/api/apps', methods=['GET'])
def get_apps():
    return jsonify(apps), 200

# User Accounts
@app.route('/api/register', methods=['POST'])
def register_user():
    data = request.get_json()
    username = data.get('username')
    password = data.get('password')

    if not username or not password:
        return jsonify({"error": "Invalid username or password"}), 400

    if username in users:
        return jsonify({"error": "Username already exists"}), 409

    users[username] = {"password": password}
    return jsonify({"message": "Registration successful"}), 201

@app.route('/api/login', methods=['POST'])
def login_user():
    data = request.get_json()
    username = data.get('username')
    password = data.get('password')

    if not username or not password:
        return jsonify({"error": "Invalid username or password"}), 400

    if username not in users or users[username]["password"] != password:
        return jsonify({"error": "Invalid credentials"}), 401

    # Generate and return authentication token (in real-world, use JWT)
    token = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9..."
    return jsonify({"token": token}), 200

# App Management
@app.route('/api/apps/upload', methods=['POST'])
def upload_app():
    # Check authentication (in real-world, use middleware or decorator)
    auth_token = request.headers.get('Authorization')
    if not auth_token:
        return jsonify({"error": "Authentication required"}), 401

    data = request.get_json()
    app_id = data.get('app_id')
    name = data.get('name')
    category = data.get('category')
    version = data.get('version')
    rating = data.get('rating')

    if not app_id or not name or not category or not version or not rating:
        return jsonify({"error": "Invalid app data"}), 400

    apps[app_id] = {"name": name, "category": category, "version": version, "rating": rating}

    return jsonify({"app_id": app_id, "message": "App uploaded successfully."}), 200

@app.route('/api/apps/update', methods=['PUT'])
def update_app():
    # Check authentication (in real-world, use middleware or decorator)
    auth_token = request.headers.get('Authorization')
    if not auth_token:
        return jsonify({"error": "Authentication required"}), 401

    data = request.get_json()
    app_id = data.get('app_id')
    if app_id not in apps:
        return jsonify({"error": "App not found"}), 404

    apps[app_id].update(data)
    return jsonify({"message": "App updated successfully."}), 200

# App Reviews & Ratings
@app.route('/api/apps/<app_id>/reviews', methods=['POST'])
def add_review(app_id):
    data = request.get_json()
    review = data.get('review')
    rating = data.get('rating')

    if not review or not rating:
        return jsonify({"error": "Invalid review or rating"}), 400

    if app_id not in apps:
        return jsonify({"error": "App not found"}), 404

    # Save the review and rating (skipped for simplicity)
    return jsonify({"message": "Review added successfully."}), 200

# Search & Discovery
@app.route('/api/apps/search', methods=['GET'])
def search_apps():
    search_query = request.args.get('q')
    category_filter = request.args.get('category')
    sort_by = request.args.get('sort')

    # Filtering and sorting logic (skipped for simplicity)
    filtered_apps = apps  # Replace with actual search and filter logic

    return jsonify(filtered_apps), 200


if __name__ == '__main__':
    app.run(debug=True)

import random
import time

class LatencyCollector:
    def __init__(self):
        self.latency_metrics = []

    def collect_latency_metric(self, source: str, latency: float):
        self.latency_metrics.append({"source": source, "latency": latency})


class LatencyAnalyzer:
    def __init__(self, collector: LatencyCollector):
        self.collector = collector

    def calculate_average_latency(self) -> float:
        if not self.collector.latency_metrics:
            return 0.0

        total_latency = sum(metric["latency"] for metric in self.collector.latency_metrics)
        average_latency = total_latency / len(self.collector.latency_metrics)
        return average_latency


class LatencyManagementSystem:
    def __init__(self):
        self.collector = LatencyCollector()
        self.analyzer = LatencyAnalyzer(self.collector)

    def record_latency(self, source: str, latency: float):
        self.collector.collect_latency_metric(source, latency)

    def simulate_requests(self, num_requests: int):
        # Simulate requests and record latency metrics
        for _ in range(num_requests):
            user_id = random.randint(1, 1200000000)
            video_id = random.randint(1, 900000000)
            latency = random.uniform(0.001, 0.1)  # Random latency between 1ms and 100ms
            self.record_latency(f"User_{user_id}_Video_{video_id}", latency)

    def simulate_daily_activity(self, num_days: int):
        # Simulate daily activity for num_days
        for _ in range(num_days):
            num_requests = random.randint(2000000, 3000000)  # Random number of requests per day
            self.simulate_requests(num_requests)

    def get_average_latency(self) -> float:
        return self.analyzer.calculate_average_latency()


# Example Usage:
if __name__ == "__main__":
    # Creating an instance of the LatencyManagementSystem.
    lms = LatencyManagementSystem()

    # Simulating daily activity for 10 days.
    num_days = 10
    lms.simulate_daily_activity(num_days)

    # Getting the average latency of all requests during the simulation.
    average_latency = lms.get_average_latency()

    print(f"Average Latency for {num_days} days of simulation: {average_latency * 1000:.2f} ms")