import queue

class RequestQueue:
    def __init__(self):
        self.queue = queue.Queue()

    def add_request(self, request):
        self.queue.put(request)

    def get_request(self):
        return self.queue.get()

class ResponseQueue:
    def __init__(self):
        self.queue = queue.Queue()

    def add_response(self, response):
        self.queue.put(response)

    def get_response(self):
        return self.queue.get()

class SyncService:
    def __init__(self):
        self.files = {}

    def add_file(self, filename, content):
        self.files[filename] = content

    def get_file(self, filename):
        return self.files.get(filename)

    def update_file(self, filename, content):
        if filename in self.files:
            self.files[filename] = content
            return True
        return False

class NotificationService:
    def __init__(self):
        self.subscribers = {}

    def subscribe(self, user_id):
        if user_id not in self.subscribers:
            self.subscribers[user_id] = []

    def unsubscribe(self, user_id):
        if user_id in self.subscribers:
            self.subscribers.pop(user_id)

    def notify_subscribers(self, user_id, message):
        if user_id in self.subscribers:
            for subscriber in self.subscribers[user_id]:
                subscriber.notify(message)

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

    def notify(self, message):
        print(f"Received notification: {message}")

request_queue = RequestQueue()
response_queue = ResponseQueue()
sync_service = SyncService()
notification_service = NotificationService()

# Add a file to the sync service
sync_service.add_file("file1.txt", "Hello, world!")

# Subscribe a user to the notification service
user = User("user1")
notification_service.subscribe(user.user_id)

# Add a request to the request queue
request_queue.add_request({
    "type": "get_file",
    "filename": "file1.txt"
})

# Process requests and send responses
while True:
    request = request_queue.get_request()

    if request["type"] == "get_file":
        filename = request["filename"]
        content = sync_service.get_file(filename)

        response_queue.add_response({
            "type": "file_content",
            "filename": filename,
            "content": content
        })

    # Notify subscribers of any file updates
    for filename, content in sync_service.files.items():
        notification_service.notify_subscribers(user.user_id, f"File '{filename}' has been updated.")

# Upload a file to OneDrive
POST /api/onedrive/upload
Parameters:
- access_token (string, required): Access token for authentication
- file (file, required): File to upload

Response:
- Status code 200 OK on successful upload
- Status code 401 Unauthorized if access_token is invalid or expired
- Status code 500 Internal Server Error if upload fails for any reason


# Download a file from OneDrive
GET /api/onedrive/download
Parameters:
- access_token (string, required): Access token for authentication
- file_id (string, required): ID of file to download

Response:
- File stream on successful download
- Status code 401 Unauthorized if access_token is invalid or expired
- Status code 404 Not Found if file_id is invalid
- Status code 500 Internal Server Error if download fails for any reason


# Get file history information from OneDrive
GET /api/onedrive/file_history
Parameters:
- access_token (string, required): Access token for authentication
- file_id (string, required): ID of file to retrieve history for

Response:
- List of file versions with metadata (timestamp, user, etc.)
- Status code 401 Unauthorized if access_token is invalid or expired
- Status code 404 Not Found if file_id is invalid
- Status code 500 Internal Server Error if history retrieval fails for any reason

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

class User {
    private String username;
    private String password;
    private Map<String, File> files;

    public User(String username, String password) {
        this.username = username;
        this.password = password;
        this.files = new HashMap<>();
    }

    public String getUsername() {
        return username;
    }

    public String getPassword() {
        return password;
    }

    public Map<String, File> getFiles() {
        return files;
    }

    public void uploadFile(String fileName, String content) {
        File file = new File(fileName, content);
        files.put(fileName, file);
        System.out.println("File uploaded successfully: " + fileName);
    }

    public void deleteFile(String fileName) {
        if (files.containsKey(fileName)) {
            files.remove(fileName);
            System.out.println("File deleted successfully: " + fileName);
        } else {
            System.out.println("File not found: " + fileName);
        }
    }

    public void downloadFile(String fileName) {
        if (files.containsKey(fileName)) {
            File file = files.get(fileName);
            System.out.println("File downloaded successfully: " + fileName);
            System.out.println("Content: " + file.getContent());
        } else {
            System.out.println("File not found: " + fileName);
        }
    }
}

class File {
    private String name;
    private String content;

    public File(String name, String content) {
        this.name = name;
        this.content = content;
    }

    public String getName() {
        return name;
    }

    public String getContent() {
        return content;
    }
}

class OneDriveSystem {
    private Map<String, User> users;

    public OneDriveSystem() {
        this.users = new HashMap<>();
    }

    public void registerUser(String username, String password) {
        if (users.containsKey(username)) {
            System.out.println("Username already exists: " + username);
        } else {
            User user = new User(username, password);
            users.put(username, user);
            System.out.println("User registered successfully: " + username);
        }
    }

    public User loginUser(String username, String password) {
        if (users.containsKey(username)) {
            User user = users.get(username);
            if (user.getPassword().equals(password)) {
                System.out.println("User logged in successfully: " + username);
                return user;
            } else {
                System.out.println("Incorrect password for user: " + username);
            }
        }
        System.out.println("User not found: " + username);
        return null;
    }
}

public class OneDriveApp {
    public static void main(String[] args) {
        OneDriveSystem oneDrive = new OneDriveSystem();

        // Register users
        oneDrive.registerUser("user1", "password1");
        oneDrive.registerUser("user2", "password2");

        // Login with a user
        User user = oneDrive.loginUser("user1", "password1");
        if (user != null) {
            // Upload a file
            user.uploadFile("file1.txt", "This is the content of file 1");

            // Download a file
            user.downloadFile("file1.txt");

            // Delete a file
            user.deleteFile("file1.txt");
        }
    }
}

class WebullSimulation:
    def __init__(self, total_users, daily_active_users, trades_per_user, read_write_ratio):
        self.total_users = total_users
        self.daily_active_users = daily_active_users
        self.trades_per_user = trades_per_user
        self.read_write_ratio = read_write_ratio

    def simulate_storage(self):
        trade_data_size_kb = 1  # Average size of each trade's data in KB
        total_trades_per_day = self.daily_active_users * self.trades_per_user
        total_storage_per_day = total_trades_per_day * trade_data_size_kb
        total_storage_3_years = total_storage_per_day * 365 * 3

        print(f"Total Storage per day: {total_storage_per_day} KB")
        print(f"Total Storage for 3 years: {total_storage_3_years} KB")

    def simulate_requests_per_second(self):
        total_trades_per_day = self.daily_active_users * self.trades_per_user
        requests_per_second = total_trades_per_day / 24 / 3600

        print(f"Requests per second: {requests_per_second} trades/second")


# Simulate Webull scalability requirements
webull_sim = WebullSimulation(total_users=10000000, daily_active_users=2000000,
                             trades_per_user=5, read_write_ratio=100)

# Simulate storage requirements
webull_sim.simulate_storage()

# Simulate requests per second
webull_sim.simulate_requests_per_second()

import uuid

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

class Stock:
    def __init__(self, stock_id, name, symbol):
        self.stock_id = stock_id
        self.name = name
        self.symbol = symbol
        # Other stock attributes

class Webull:
    def __init__(self):
        self.users = {}  # Map of user_id to User object
        self.stocks = {}  # Map of stock_id to Stock object

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

    def get_user(self, user_id):
        return self.users.get(user_id)

    def create_stock(self, name, symbol):
        stock_id = str(uuid.uuid4())
        stock = Stock(stock_id, name, symbol)
        self.stocks[stock_id] = stock
        return stock_id

    def get_stock(self, stock_id):
        return self.stocks.get(stock_id)

    # Additional methods for handling user actions, stock data, etc.
    # ...

from flask import Flask, request, jsonify

app = Flask(__name__)

# In-memory data placeholders (for illustration purposes)
users = {
    "1": {
        "id": "1",
        "username": "[email protected]",
        "name": "John Doe",
        "email": "[email protected]"
    }
}

portfolio = {
    "1": {
        "user_id": "1",
        "portfolio_value": 10000.0,
        "positions": [
            {
                "symbol": "AAPL",
                "quantity": 10,
                "average_price": 150.0,
                "current_price": 160.0,
                "total_value": 1600.0
            },
            {
                "symbol": "GOOGL",
                "quantity": 5,
                "average_price": 2200.0,
                "current_price": 2300.0,
                "total_value": 11500.0
            }
        ]
    }
}

orders = {
    "1": {
        "order_id": "1",
        "symbol": "AAPL",
        "side": "buy",
        "quantity": 5,
        "price": 160.0,
        "order_type": "limit",
        "status": "pending"
    }
}

market_data = {
    "AAPL": {
        "symbol": "AAPL",
        "last_price": 160.0,
        "volume": 100000,
        "change": 2.0
    }
}

# Endpoint: /auth/login
@app.route('/auth/login', methods=['POST'])
def login():
    # Perform authentication logic
    username = request.json['username']
    password = request.json['password']
    
    # Generate and return an access token (dummy implementation)
    access_token = generate_access_token(username)
    
    return jsonify({'access_token': access_token})


# Endpoint: /users/{user_id}
@app.route('/users/<user_id>', methods=['GET'])
def get_user_profile(user_id):
    # Fetch user profile information from the database
    user = fetch_user(user_id)
    
    return jsonify(user)


# Endpoint: /users/{user_id}/portfolio
@app.route('/users/<user_id>/portfolio', methods=['GET'])
def get_user_portfolio(user_id):
    # Fetch user's portfolio information from the database
    user_portfolio = fetch_portfolio(user_id)
    
    return jsonify(user_portfolio)


# Endpoint: /users/{user_id}/orders
@app.route('/users/<user_id>/orders', methods=['POST'])
def place_order(user_id):
    # Validate the order details from the request body
    symbol = request.json['symbol']
    side = request.json['side']
    quantity = request.json['quantity']
    price = request.json['price']
    order_type = request.json['order_type']
    
    # Perform order placement logic
    order_id = place_order_logic(user_id, symbol, side, quantity, price, order_type)
    
    # Return the order details
    order = fetch_order(order_id)
    
    return jsonify(order)


# Endpoint: /market/quotes/{symbol}
@app.route('/market/quotes/<symbol>', methods=['GET'])
def get_market_quote(symbol):
    # Fetch real-time market data for the given symbol
    quote = fetch_market_quote(symbol)
    
    return jsonify(quote)


# Helper functions
def generate_access_token(username):
    # Token generation logic (dummy implementation)
    return "dummy-access-token"


def fetch_user(user_id):
    # Fetch user from the database or data placeholder
    return users.get(user_id)


def fetch_portfolio(user_id):
    # Fetch user's portfolio from the database or data placeholder
    return portfolio.get(user_id)


def place_order_logic(user_id, symbol, side, quantity, price, order_type):
    # Perform order placement logic (dummy implementation)
    order_id = str(len(orders) + 1)
    order = {
        "order_id": order_id,
        "symbol": symbol,
        "side": side,
        "quantity": quantity,
        "price": price,
        "order_type": order_type,
        "status": "pending"
    }
    orders[order_id] = order
    return order_id


def fetch_order(order_id):
    # Fetch order details from the database or data placeholder
    return orders.get(order_id)


def fetch_market_quote(symbol):
    # Fetch market data from a data provider or data placeholder
    return market_data.get(symbol)


# Run the Flask application
if __name__ == '__main__':
    app.run()

from flask import Flask, jsonify, request

app = Flask(__name__)
webull = Webull()

# User Management API
@app.route('/users', methods=['POST'])
def create_user():
    data = request.json
    username = data.get('username')
    password = data.get('password')
    user_id = webull.create_user(username, password)
    return jsonify({'user_id': user_id}), 201

@app.route('/users/<user_id>', methods=['GET'])
def get_user(user_id):
    user = webull.get_user(user_id)
    if user:
        return jsonify(user.__dict__), 200
    else:
        return jsonify({'message': 'User not found'}), 404

# Stock Management API
@app.route('/stocks', methods=['POST'])
def create_stock():
    data = request.json
    name = data.get('name')
    symbol = data.get('symbol')
    stock_id = webull.create_stock(name, symbol)
    return jsonify({'stock_id': stock_id}), 201

@app.route('/stocks/<stock_id>', methods=['GET'])
def get_stock(stock_id):
    stock = webull.get_stock(stock_id)
    if stock:
        return jsonify(stock.__dict__), 200
    else:
        return jsonify({'message': 'Stock not found'}), 404

# User Actions API
@app.route('/users/<user_id>/follow/<stock_id>', methods=['POST'])
def follow_stock(user_id, stock_id):
    user = webull.get_user(user_id)
    stock = webull.get_stock(stock_id)
    if user and stock:
        # Logic to make user follow the stock
        return jsonify({'message': 'User followed the stock'}), 200
    else:
        return jsonify({'message': 'User or stock not found'}), 404

@app.route('/users/<user_id>/unfollow/<stock_id>', methods=['POST'])
def unfollow_stock(user_id, stock_id):
    user = webull.get_user(user_id)
    stock = webull.get_stock(stock_id)
    if user and stock:
        # Logic to make user unfollow the stock
        return jsonify({'message': 'User unfollowed the stock'}), 200
    else:
        return jsonify({'message': 'User or stock not found'}), 404

@app.route('/users/<user_id>/stocks', methods=['GET'])
def get_user_stocks(user_id):
    user = webull.get_user(user_id)
    if user:
        # Logic to retrieve stocks followed by the user
        return jsonify({'stocks': []}), 200
    else:
        return jsonify({'message': 'User not found'}), 404

# Stock Data API
@app.route('/stocks/<stock_id>/price', methods=['GET'])
def get_stock_price(stock_id):
    stock = webull.get_stock(stock_id)
    if stock:
        # Logic to retrieve the current price of the stock
        return jsonify({'price': 100.0}), 200
    else:
        return jsonify({'message': 'Stock not found'}), 404

@app.route('/stocks/<stock_id>/historical', methods=['GET'])
def get_stock_historical_data(stock_id):
    stock = webull.get_stock(stock_id)
    if stock:
        # Logic to retrieve historical price data of the stock
        return jsonify({'historical_data': []}), 200
    else:
        return jsonify({'message': 'Stock not found'}), 404

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

import random

class HotstarSimulation:
    def __init__(self, total_users, daily_active_users, videos_watched_per_user):
        self.total_users = total_users
        self.daily_active_users = daily_active_users
        self.videos_watched_per_user = videos_watched_per_user

    def simulate(self):
        # Simulate requests for each active user
        for _ in range(self.daily_active_users):
            user_id = random.randint(1, self.total_users)
            self.process_user_requests(user_id)

    def process_user_requests(self, user_id):
        # Simulate requests for videos watched by a user
        for _ in range(self.videos_watched_per_user):
            video_id = self.generate_video_id()
            self.process_video_request(user_id, video_id)

    def process_video_request(self, user_id, video_id):
        # Simulate processing of video request
        print(f"User {user_id} is watching Video {video_id}")

    def generate_video_id(self):
        # Simulate generation of video ID
        return random.randint(1, 100000)

# Example usage:
simulation = HotstarSimulation(total_users=1200000000, daily_active_users=300000000, videos_watched_per_user=3)
simulation.simulate()

class User:
    def __init__(self, user_id, username, email, password, subscription_type):
        self.user_id = user_id
        self.username = username
        self.email = email
        self.password = password
        self.subscription_type = subscription_type
        self.last_login = None
        # other user attributes

class Video:
    def __init__(self, video_id, title, description, duration, genre, language):
        self.video_id = video_id
        self.title = title
        self.description = description
        self.duration = duration
        self.genre = genre
        self.language = language
        # other video attributes

class UserVideoInteraction:
    def __init__(self, interaction_id, user_id, video_id, interaction_type, timestamp):
        self.interaction_id = interaction_id
        self.user_id = user_id
        self.video_id = video_id
        self.interaction_type = interaction_type
        self.timestamp = timestamp

class Subscription:
    def __init__(self, subscription_id, user_id, subscription_type, start_date, end_date):
        self.subscription_id = subscription_id
        self.user_id = user_id
        self.subscription_type = subscription_type
        self.start_date = start_date
        self.end_date = end_date

class Hotstar:
    def __init__(self):
        self.users = {}
        self.videos = []
        self.interactions = []
        self.subscriptions = []

    def add_user(self, user):
        self.users[user.user_id] = user

    def get_user_by_id(self, user_id):
        return self.users.get(user_id)

    def add_video(self, video):
        self.videos.append(video)

    def get_video_by_id(self, video_id):
        for video in self.videos:
            if video.video_id == video_id:
                return video
        return None

    def create_interaction(self, user_id, video_id, interaction_type):
        interaction_id = len(self.interactions) + 1
        timestamp = datetime.now()
        interaction = UserVideoInteraction(interaction_id, user_id, video_id, interaction_type, timestamp)
        self.interactions.append(interaction)

    def get_interactions_for_video(self, video_id):
        return [interaction for interaction in self.interactions if interaction.video_id == video_id]

    def create_subscription(self, user_id, subscription_type):
        subscription_id = len(self.subscriptions) + 1
        start_date = datetime.now()
        end_date = start_date + timedelta(days=30)  # Assuming a 30-day subscription period
        subscription = Subscription(subscription_id, user_id, subscription_type, start_date, end_date)
        self.subscriptions.append(subscription)

    def get_subscription_for_user(self, user_id):
        for subscription in self.subscriptions:
            if subscription.user_id == user_id:
                return subscription
        return None

# Usage example:
hotstar = Hotstar()

user1 = User("1", "Alice", "[email protected]", "password123", "Premium")
user2 = User("2", "Bob", "[email protected]", "password456", "Free")

hotstar.add_user(user1)
hotstar.add_user(user2)

video1 = Video("v1", "Video 1", "Description 1", 120, "Drama", "English")
video2 = Video("v2", "Video 2", "Description 2", 90, "Comedy", "Hindi")

hotstar.add_video(video1)
hotstar.add_video(video2)

hotstar.create_interaction("1", "v1", "like")
hotstar.create_interaction("1", "v2", "view")

video1_interactions = hotstar.get_interactions_for_video("v1")

hotstar.create_subscription("1", "Premium")

user1_subscription = hotstar.get_subscription_for_user("1")

from flask import Flask, request, Response

app = Flask(__name__)

@app.route('/stream/<content_id>', methods=['GET'])
def stream_content(content_id):
    # Logic to retrieve video file and stream it
    video_file_path = get_video_file_path(content_id)
    return Response(stream_video(video_file_path),
                    mimetype='video/mp4')

def get_video_file_path(content_id):
    # Logic to fetch the video file path based on the content_id
    return f'/path/to/video/{content_id}.mp4'

def stream_video(video_file_path):
    with open(video_file_path, 'rb') as video_file:
        while True:
            video_chunk = video_file.read(1024)
            if not video_chunk:
                break
            yield video_chunk

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

class Content:
    def __init__(self, content_id, title, description, genre, language):
        self.content_id = content_id
        self.title = title
        self.description = description
        self.genre = genre
        self.language = language

class ContentCatalog:
    def __init__(self):
        self.contents = []

    def add_content(self, content):
        self.contents.append(content)

    def get_content_by_genre(self, genre):
        return [content for content in self.contents if content.genre == genre]

    def get_content_by_language(self, language):
        return [content for content in self.contents if content.language == language]

# Usage example:
catalog = ContentCatalog()
content1 = Content(1, "Movie 1", "Description 1", "Action", "English")
content2 = Content(2, "Movie 2", "Description 2", "Comedy", "Hindi")
content3 = Content(3, "Movie 3", "Description 3", "Drama", "English")

catalog.add_content(content1)
catalog.add_content(content2)
catalog.add_content(content3)

action_movies = catalog.get_content_by_genre("Action")
english_movies = catalog.get_content_by_language("English")

class LiveEvent:
    def __init__(self, event_id, title, description):
        self.event_id = event_id
        self.title = title
        self.description = description

class LiveStreamingService:
    def __init__(self):
        self.live_events = []

    def add_live_event(self, event):
        self.live_events.append(event)

    def get_live_events(self):
        return self.live_events

# Usage example:
streaming_service = LiveStreamingService()
event1 = LiveEvent(1, "Sports Event 1", "Description 1")
event2 = LiveEvent(2, "News Event 1", "Description 2")
event3 = LiveEvent(3, "Sports Event 2", "Description 3")

streaming_service.add_live_event(event1)
streaming_service.add_live_event(event2)
streaming_service.add_live_event(event3)

live_events = streaming_service.get_live_events()

class User:
    def __init__(self, user_id, name, preferences, viewing_history, demographics):
        self.user_id = user_id
        self.name = name
        self.preferences = preferences
        self.viewing_history = viewing_history
        self.demographics = demographics

class RecommendationEngine:
    def __init__(self):
        # Initialize recommendation engine

    def get_personalized_recommendations(self, user):
        # Generate personalized recommendations based on user preferences, viewing history, and demographics
        return recommendations

# Usage example:
engine = RecommendationEngine()
user1 = User(1, "John", ["Action", "Comedy"], ["Movie 1", "Movie 2"], "Male, 25-34")
recommendations = engine.get_personalized_recommendations(user1)

class UserDevice:
    def __init__(self, device_id, device_type):
        self.device_id = device_id
        self.device_type = device_type

class UserDevicesManager:
    def __init__(self):
        self.user_devices = {}

    def add_user_device(self, user_id, device):
        if user_id not in self.user_devices:
            self.user_devices[user_id] = []
        self.user_devices[user_id].append(device)

    def get_user_devices(self, user_id):
        return self.user_devices.get(user_id, [])

# Usage example:
devices_manager = UserDevicesManager()
device1 = UserDevice("device1", "Smartphone")
device2 = UserDevice("device2", "Smart TV")

devices_manager.add_user_device(1, device1)
devices_manager.add_user_device(1, device2)

user1_devices = devices_manager.get_user_devices(1)

class DownloadManager:
    def __init__(self):
        self.downloads = {}

    def download_content(self, user_id, content_id):
        if user_id not in self.downloads:
            self.downloads[user_id] = []
        self.downloads[user_id].append(content_id)

    def get_user_downloads(self, user_id):
        return self.downloads.get(user_id, [])

# Usage example:
download_manager = DownloadManager()
download_manager.download_content(1, 1)
download_manager.download_content(1, 2)
download_manager.download_content(2, 3)

user1_downloads = download_manager.get_user_downloads(1)

class User:
    def __init__(self, username, email, password):
        self.username = username
        self.email = email
        self.password = password
        self.followers = []
        self.following = []

    def follow_user(self, user):
        user.followers.append(self)
        self.following.append(user)

# Example usage:
user1 = User("john_doe", "john@example.com", "password123")
user2 = User("jane_smith", "jane@example.com", "password456")
user1.follow_user(user2)

class Track:
    def __init__(self, title, artist, duration, genre):
        self.title = title
        self.artist = artist
        self.duration = duration
        self.genre = genre

    def upload(self):
        # Upload track to storage
        # ...

    def stream(self):
        # Stream audio to listeners
        # ...

# Example usage:
track1 = Track("Song 1", "Artist 1", 180, "Pop")
track1.upload()
track1.stream()

class Comment:
    def __init__(self, track, user, content):
        self.track = track
        self.user = user
        self.content = content
        self.timestamp = datetime.now()

# Example usage:
user1 = User("john_doe", "[email protected]", "password123")
track1 = Track("Song 1", "Artist 1", 180, "Pop")
comment1 = Comment(track1, user1, "Great track!")

class Like:
    def __init__(self, track, user):
        self.track = track
        self.user = user
        self.timestamp = datetime.now()

# Example usage:
user1 = User("john_doe", "[email protected]", "password123")
track1 = Track("Song 1", "Artist 1", 180, "Pop")
like1 = Like(track1, user1)

class Playlist:
    def __init__(self, name):
        self.name = name
        self.tracks = []

    def add_track(self, track):
        self.tracks.append(track)

    def remove_track(self, track):
        self.tracks.remove(track)

# Example usage:
playlist1 = Playlist("My Favorites")
playlist1.add_track(track1)
playlist1.remove_track(track1)

class RecommendationService:
    def __init__(self, tracks, user_preferences):
        self.tracks = tracks
        self.user_preferences = user_preferences

    def generate_recommendations(self):
        # Generate recommendations based on user preferences and track data
        recommendations = []
        # ...
        return recommendations

# Example usage:
track1 = Track("Song 1", "Artist 1", 180, "Pop")
track2 = Track("Song 2", "Artist 2", 240, "Rock")
tracks = [track1, track2]
user_preferences = ["Pop"]
recommendation_service = RecommendationService(tracks, user_preferences)
recommendations = recommendation_service.generate_recommendations()

from flask import Flask, jsonify, request

app = Flask(__name__)

# Sample data for users, tracks, and playlists
users = {}
tracks = {}
playlists = {}

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

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

# Track Management API
@app.route('/tracks', methods=['POST'])
def create_track():
    # Create a new track based on request data
    track_data = request.get_json()
    track_id = track_data['trackId']
    tracks[track_id] = track_data
    return jsonify({'message': 'Track created successfully'})

@app.route('/tracks/<trackId>', methods=['GET'])
def get_track(trackId):
    # Retrieve track information by trackId
    if trackId in tracks:
        return jsonify(tracks[trackId])
    else:
        return jsonify({'message': 'Track not found'}), 404

# Playlist Management API
@app.route('/playlists', methods=['POST'])
def create_playlist():
    # Create a new playlist based on request data
    playlist_data = request.get_json()
    playlist_id = playlist_data['playlistId']
    playlists[playlist_id] = playlist_data
    return jsonify({'message': 'Playlist created successfully'})

@app.route('/playlists/<playlistId>', methods=['GET'])
def get_playlist(playlistId):
    # Retrieve playlist information by playlistId
    if playlistId in playlists:
        return jsonify(playlists[playlistId])
    else:
        return jsonify({'message': 'Playlist not found'}), 404

# Additional endpoints and logic for managing comments, likes, follow/unfollow, recommendations, etc.

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

from flask import Flask, request, jsonify

app = Flask(__name__)

@app.route('/api/auth/login', methods=['POST'])
def login():
    # Get login credentials from the request body
    username = request.json.get('username')
    password = request.json.get('password')
    
    # Authenticate user
    # ...
    
    # Generate and return an authentication token
    auth_token = generate_auth_token(username)
    return jsonify({'token': auth_token}), 200

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

from flask import Flask, request, jsonify

app = Flask(__name__)

@app.route('/api/tracks', methods=['POST'])
def upload_track():
    # Get track details from the request body
    title = request.json.get('title')
    artist = request.json.get('artist')
    audio_file = request.files['audio']
    
    # Save the audio file and extract its metadata
    file_path = save_audio_file(audio_file)
    duration = extract_audio_duration(file_path)
    
    # Create a new track in the database
    track_id = create_track(title, artist, file_path, duration)
    
    return jsonify({'track_id': track_id}), 201

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

from flask import Flask, request, jsonify

app = Flask(__name__)

@app.route('/api/tracks/<track_id>', methods=['GET'])
def get_track_details(track_id):
    # Fetch track details from the database
    track = fetch_track(track_id)
    
    # Prepare the response
    response = {
        'title': track.title,
        'artist': track.artist,
        'duration': track.duration,
        'url': generate_track_url(track_id),
        # additional track details
    }
    
    return jsonify(response), 200

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

from flask import Flask, request, jsonify

app = Flask(__name__)

@app.route('/api/tracks/<track_id>/like', methods=['POST'])
def like_track(track_id):
    # Get user authentication token from request headers
    auth_token = request.headers.get('Authorization')
    
    # Verify and extract user details from the authentication token
    user = verify_auth_token(auth_token)
    
    # Check if the user has already liked the track
    if has_liked_track(user, track_id):
        return jsonify({'message': 'Track already liked'}), 400
    
    # Like the track
    like_track(user, track_id)
    
    return jsonify({'message': 'Track liked successfully'}), 200

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

class User:
    def __init__(self, username, email, password):
        self.username = username
        self.email = email
        self.password = password
        self.following = []

    def personalize_profile(self, profile_info):
        # Update user profile with personalized information
        self.profile_info = profile_info

    def follow_user(self, user):
        # Add user to the following list
        self.following.append(user)

# Example usage:
user1 = User("john_doe", "[email protected]", "password123")
user1.personalize_profile("Music enthusiast")
user2 = User("jane_smith", "[email protected]", "password456")
user1.follow_user(user2)

class AudioTrack:
    def __init__(self, title, artist, audio_file):
        self.title = title
        self.artist = artist
        self.audio_file = audio_file

    def upload(self):
        # Upload audio file to SoundCloud storage
        uploaded_file = upload_to_soundcloud_storage(self.audio_file)
        self.audio_file = uploaded_file

    def stream(self):
        # Stream audio to listeners in real-time
        stream_audio(self.audio_file)

# Example usage:
track1 = AudioTrack("Song 1", "Artist 1", "song1.mp3")
track1.upload()
track1.stream()

class AudioTrack:
    def __init__(self, title, artist, audio_file):
        self.title = title
        self.artist = artist
        self.audio_file = audio_file
        self.likes = []
        self.comments = []

    def like(self, user):
        # Add user to the list of users who liked the track
        self.likes.append(user)

    def comment(self, user, comment):
        # Add user's comment to the track's comments section
        self.comments.append((user, comment))

    def share(self, user, recipient):
        # Share the track with another user
        send_track_share_notification(user, recipient, self)

# Example usage:
user1 = User("john_doe", "[email protected]", "password123")
user2 = User("jane_smith", "[email protected]", "password456")
track1 = AudioTrack("Song 1", "Artist 1", "song1.mp3")
track1.like(user1)
track1.comment(user2, "Great track!")
track1.share(user1, user2)

class Playlist:
    def __init__(self, name):
        self.name = name
        self.tracks = []

    def add_track(self, track):
        # Add track to the playlist
        self.tracks.append(track)

    def repost_track(self, track, user):
        # Repost track on user's profile
        user.reposted_tracks.append(track)

# Example usage:
user1 = User("john_doe", "[email protected]", "password123")
track1 = AudioTrack("Song 1", "Artist 1", "song1.mp3")
playlist1 = Playlist("My Favorites")
playlist1.add_track(track1)
playlist1.repost_track(track1, user1)

class SoundCloud:
    def __init__(self):
        self.tracks = []

    def recommend_tracks(self, user):
        # Use recommendation algorithms to suggest tracks based on user preferences
        recommended_tracks = recommendation_algorithm(user)
        return recommended_tracks

# Example usage:
soundcloud = SoundCloud()
user1 = User("john_doe", "[email protected]", "password123")
user1.personalize_profile("Music enthusiast")
track1 = AudioTrack("Song 1", "Artist 1", "song1.mp3")
soundcloud.tracks.append(track1)
recommended_tracks = soundcloud.recommend_tracks(user1)

from flask import Flask, jsonify

app = Flask(__name__)

@app.route('/api/tracks', methods=['GET'])
def get_tracks():
    # Retrieve tracks from the database
    tracks = retrieve_tracks_from_database()
    
    # Prepare tracks for JSON response
    response = []
    for track in tracks:
        response.append({
            'title': track.title,
            'artist': track.artist,
            # additional track details
        })
    
    # Return tracks as JSON response
    return jsonify(response)

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

from flask import Flask, jsonify, request

app = Flask(__name__)

# Mock data for demonstration purposes
users = []
restaurants = []
orders = []
menu_items = []

# User Service
@app.route("/users", methods=["POST"])
def register_user():
    data = request.get_json()
    username = data.get("username")
    email = data.get("email")
    password = data.get("password")
    
    user = {"username": username, "email": email, "password": password}
    users.append(user)
    return jsonify({"message": "User registered successfully."}), 201

@app.route("/users/<int:user_id>", methods=["GET"])
def get_user(user_id):
    for user in users:
        if user["id"] == user_id:
            return jsonify(user)
    return jsonify({"message": "User not found."}), 404

# Restaurant Service
@app.route("/restaurants", methods=["POST"])
def add_restaurant():
    data = request.get_json()
    name = data.get("name")
    location = data.get("location")
    
    restaurant = {"name": name, "location": location}
    restaurants.append(restaurant)
    return jsonify({"message": "Restaurant added successfully."}), 201

@app.route("/restaurants/<int:restaurant_id>", methods=["PUT"])
def update_restaurant(restaurant_id):
    data = request.get_json()
    name = data.get("name")
    location = data.get("location")
    
    for restaurant in restaurants:
        if restaurant["id"] == restaurant_id:
            restaurant["name"] = name
            restaurant["location"] = location
            return jsonify({"message": "Restaurant updated successfully."}), 200
    return jsonify({"message": "Restaurant not found."}), 404

# Menu Service
@app.route("/restaurants/<int:restaurant_id>/menu", methods=["POST"])
def add_menu_item(restaurant_id):
    data = request.get_json()
    item_name = data.get("name")
    price = data.get("price")
    
    for restaurant in restaurants:
        if restaurant["id"] == restaurant_id:
            item = {"name": item_name, "price": price}
            menu_items.append(item)
            return jsonify({"message": "Menu item added successfully."}), 201
    return jsonify({"message": "Restaurant not found."}), 404

@app.route("/restaurants/<int:restaurant_id>/menu/<int:item_id>", methods=["PUT"])
def update_menu_item(restaurant_id, item_id):
    data = request.get_json()
    item_name = data.get("name")
    price = data.get("price")
    
    for item in menu_items:
        if item["id"] == item_id:
            item["name"] = item_name
            item["price"] = price
            return jsonify({"message": "Menu item updated successfully."}), 200
    return jsonify({"message": "Menu item not found."}), 404

# Order Service
@app.route("/users/<int:user_id>/orders", methods=["POST"])
def place_order(user_id):
    data = request.get_json()
    restaurant_id = data.get("restaurant_id")
    items = data.get("items")
    
    for user in users:
        if user["id"] == user_id:
            order = {"user_id": user_id, "restaurant_id": restaurant_id, "items": items, "status": "Placed"}
            orders.append(order)
            return jsonify({"message": "Order placed successfully."}), 201
    return jsonify({"message": "User not found."}), 404

@app.route("/users/<int:user_id>/orders", methods=["GET"])
def get_user_orders(user_id):
    user_orders = []
    for order in orders:
        if order["user_id"] == user_id:
            user_orders.append(order)
    return jsonify(user_orders)

@app.route("/orders/<int:order_id>", methods=["GET"])
def get_order(order_id):
    for order in orders:
        if order["id"] == order_id:
            return jsonify(order)
    return jsonify({"message": "Order not found."}), 404

# Payment Service
@app.route("/payments", methods=["POST"])
def make_payment():
    data = request.get_json()
    order_id = data.get("order_id")
    payment_details = data.get("payment_details")
    
    for order in orders:
        if order["id"] == order_id:
            order["payment_details"] = payment_details
            return jsonify({"message": "Payment successful."}), 200
    return jsonify({"message": "Order not found."}), 404

# Notification Service
@app.route("/users/<int:user_id>/notifications", methods=["POST"])
def send_notification(user_id):
    data = request.get_json()
    message = data.get("message")
    
    for user in users:
        if user["id"] == user_id:
            # Send notification to user using appropriate mechanism (e.g., email, push notification)
            return jsonify({"message": "Notification sent successfully."}), 200
    return jsonify({"message": "User not found."}), 404

# Search Service
@app.route("/restaurants", methods=["GET"])
def search_restaurants():
    location = request.args.get("location")
    cuisine = request.args.get("cuisine")
    
    filtered_restaurants = []
    for restaurant in restaurants:
        if location and location.lower() not in restaurant["location"].lower():
            continue
        if cuisine and cuisine.lower() not in restaurant["cuisine"].lower():
            continue
        filtered_restaurants.append(restaurant)
    return jsonify(filtered_restaurants)

# Recommendation Service
@app.route("/users/<int:user_id>/recommendations", methods=["GET"])
def get_recommendations(user_id):
    # Generate personalized recommendations based on user's preferences and order history
    recommendations = []
    # Add relevant recommendations to the list
    return jsonify(recommendations)

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

from flask import Flask, jsonify, request

app = Flask(__name__)

# Mock data for demonstration purposes
users = []
restaurants = []
orders = []
menu_items = []

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

# Restaurant class
class Restaurant:
    def __init__(self, restaurant_id, name, location):
        self.restaurant_id = restaurant_id
        self.name = name
        self.location = location
        # Other restaurant attributes

# Menu class
class MenuItem:
    def __init__(self, menu_id, restaurant_id, item_name, price):
        self.menu_id = menu_id
        self.restaurant_id = restaurant_id
        self.item_name = item_name
        self.price = price
        # Other item attributes

# Order class
class Order:
    def __init__(self, order_id, user_id, restaurant_id, status, total_amount):
        self.order_id = order_id
        self.user_id = user_id
        self.restaurant_id = restaurant_id
        self.status = status
        self.total_amount = total_amount
        # Other order attributes

# API endpoints

# User Management API
@app.route("/users", methods=["POST"])
def create_user():
    data = request.get_json()
    user_id = generate_user_id()  # Function to generate a unique user ID
    username = data.get("username")
    email = data.get("email")
    password = data.get("password")
    
    user = User(user_id, username, email, password)
    users.append(user)
    return jsonify({"message": "User created successfully"}), 201

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

# Restaurant Management API
@app.route("/restaurants", methods=["POST"])
def add_restaurant():
    data = request.get_json()
    restaurant_id = generate_restaurant_id()  # Function to generate a unique restaurant ID
    name = data.get("name")
    location = data.get("location")
    
    restaurant = Restaurant(restaurant_id, name, location)
    restaurants.append(restaurant)
    return jsonify({"message": "Restaurant added successfully"}), 201

@app.route("/restaurants/<restaurant_id>", methods=["PUT"])
def update_restaurant(restaurant_id):
    data = request.get_json()
    name = data.get("name")
    location = data.get("location")
    
    for restaurant in restaurants:
        if restaurant.restaurant_id == restaurant_id:
            restaurant.name = name
            restaurant.location = location
            return jsonify({"message": "Restaurant updated successfully"}), 200
    return jsonify({"message": "Restaurant not found"}), 404

# Menu Management API
@app.route("/restaurants/<restaurant_id>/menu", methods=["POST"])
def add_menu_item(restaurant_id):
    data = request.get_json()
    menu_id = generate_menu_id()  # Function to generate a unique menu ID
    item_name = data.get("name")
    price = data.get("price")
    
    for restaurant in restaurants:
        if restaurant.restaurant_id == restaurant_id:
            menu_item = MenuItem(menu_id, restaurant_id, item_name, price)
            menu_items.append(menu_item)
            return jsonify({"message": "Menu item added successfully"}), 201
    return jsonify({"message": "Restaurant not found"}), 404

@app.route("/restaurants/<restaurant_id>/menu/<menu_id>", methods=["PUT"])
def update_menu_item(restaurant_id, menu_id):
    data = request.get_json()
    item_name = data.get("name")
    price = data.get("price")
    
    for menu_item in menu_items:
        if menu_item.restaurant_id == restaurant_id and menu_item.menu_id == menu_id:
            menu_item.item_name = item_name
            menu_item.price = price
            return jsonify({"message": "Menu item updated successfully"}), 200
    return jsonify({"message": "Menu item not found"}), 404

# Order Management API
@app.route("/users/<user_id>/orders", methods=["POST"])
def place_order(user_id):
    data = request.get_json()
    order_id = generate_order_id()  # Function to generate a unique order ID
    restaurant_id = data.get("restaurant_id")
    status = "Placed"
    total_amount = calculate_total_amount(data.get("items"))  # Function to calculate the total order amount
    
    for user in users:
        if user.user_id == user_id:
            order = Order(order_id, user_id, restaurant_id, status, total_amount)
            orders.append(order)
            return jsonify({"message": "Order placed successfully"}), 201
    return jsonify({"message": "User not found"}), 404

@app.route("/users/<user_id>/orders", methods=["GET"])
def get_user_orders(user_id):
    user_orders = []
    for order in orders:
        if order.user_id == user_id:
            user_orders.append(order.__dict__)
    return jsonify(user_orders)

@app.route("/orders/<order_id>", methods=["GET"])
def get_order(order_id):
    for order in orders:
        if order.order_id == order_id:
            return jsonify(order.__dict__)
    return jsonify({"message": "Order not found"}), 404

# Other API endpoints for payment, notification, search, recommendation, etc.
# ...

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

from flask import Flask, jsonify

app = Flask(__name__)

# Mock data for demonstration purposes
orders = [
    {"id": 1, "status": "Pending"},
    {"id": 2, "status": "Delivered"},
    {"id": 3, "status": "In Progress"}
]

@app.route("/orders", methods=["GET"])
def get_orders():
    return jsonify(orders)

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

from flask import Flask, jsonify

app = Flask(__name__)

# Mock data for demonstration purposes
restaurants = [
    {"id": 1, "name": "Restaurant A", "location": "City X"},
    {"id": 2, "name": "Restaurant B", "location": "City Y"},
    {"id": 3, "name": "Restaurant C", "location": "City Z"}
]

@app.route("/restaurants/<int:restaurant_id>", methods=["GET"])
def get_restaurant(restaurant_id):
    for restaurant in restaurants:
        if restaurant["id"] == restaurant_id:
            return jsonify(restaurant)
    return jsonify({"message": "Restaurant not found."}), 404

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

from flask import Flask, request, jsonify

app = Flask(__name__)

# Mock data for demonstration purposes
restaurants = [
    {"id": 1, "name": "Restaurant A", "location": "City X"},
    {"id": 2, "name": "Restaurant B", "location": "City Y"},
    {"id": 3, "name": "Restaurant C", "location": "City Z"}
]

@app.route("/restaurants/<int:restaurant_id>", methods=["PATCH"])
def update_restaurant(restaurant_id):
    data = request.get_json()
    name = data.get("name")
    location = data.get("location")
    
    for restaurant in restaurants:
        if restaurant["id"] == restaurant_id:
            if name:
                restaurant["name"] = name
            if location:
                restaurant["location"] = location
            return jsonify({"message": "Restaurant updated successfully."}), 200
    
    return jsonify({"message": "Restaurant not found."}), 404

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

from flask import Flask, request, jsonify

app = Flask(__name__)

# Mock data for demonstration purposes
deliveries = []

@app.route("/deliveries", methods=["POST"])
def assign_delivery():
    data = request.get_json()
    order_id = data.get("order_id")
    delivery_executive_id = data.get("delivery_executive_id")
    
    if order_id and delivery_executive_id:
        delivery = {"order_id": order_id, "delivery_executive_id": delivery_executive_id}
        deliveries.append(delivery)
        return jsonify({"message": "Delivery assigned successfully."}), 201
    else:
        return jsonify({"message": "Invalid data provided."}), 400

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

from flask import Flask, jsonify, request

app = Flask(__name__)

# Mock data for demonstration purposes
restaurants = [
    {"id": 1, "name": "Restaurant A", "location": "City X", "menu": []},
    {"id": 2, "name": "Restaurant B", "location": "City Y", "menu": []},
    {"id": 3, "name": "Restaurant C", "location": "City Z", "menu": []}
]

orders = []
deliveries = []

# Restaurant and Menu Management
@app.route("/restaurants/<int:restaurant_id>/menu", methods=["GET"])
def get_menu(restaurant_id):
    for restaurant in restaurants:
        if restaurant["id"] == restaurant_id:
            return jsonify(restaurant["menu"])
    return jsonify({"message": "Restaurant not found."}), 404

@app.route("/restaurants/<int:restaurant_id>/menu", methods=["POST"])
def add_item_to_menu(restaurant_id):
    data = request.get_json()
    item_name = data.get("name")
    price = data.get("price")
    
    for restaurant in restaurants:
        if restaurant["id"] == restaurant_id:
            item = {"name": item_name, "price": price}
            restaurant["menu"].append(item)
            return jsonify({"message": "Item added to the menu successfully."}), 201
    return jsonify({"message": "Restaurant not found."}), 404

@app.route("/restaurants/<int:restaurant_id>/menu/<int:item_id>", methods=["PATCH"])
def update_item_price(restaurant_id, item_id):
    data = request.get_json()
    new_price = data.get("price")
    
    for restaurant in restaurants:
        if restaurant["id"] == restaurant_id:
            menu = restaurant["menu"]
            for item in menu:
                if item["id"] == item_id:
                    item["price"] = new_price
                    return jsonify({"message": "Item price updated successfully."}), 200
            return jsonify({"message": "Item not found in the menu."}), 404
    return jsonify({"message": "Restaurant not found."}), 404

# User-friendly Ordering
@app.route("/orders", methods=["POST"])
def place_order():
    data = request.get_json()
    restaurant_id = data.get("restaurant_id")
    items = data.get("items")
    
    for restaurant in restaurants:
        if restaurant["id"] == restaurant_id:
            order = {"restaurant": restaurant, "items": items, "status": "Pending"}
            orders.append(order)
            return jsonify({"message": "Order placed successfully."}), 201
    return jsonify({"message": "Restaurant not found."}), 404

@app.route("/orders/<int:order_id>", methods=["GET"])
def get_order(order_id):
    for order in orders:
        if order["id"] == order_id:
            return jsonify(order)
    return jsonify({"message": "Order not found."}), 404

@app.route("/orders/<int:order_id>", methods=["PATCH"])
def update_order_status(order_id):
    data = request.get_json()
    new_status = data.get("status")
    
    for order in orders:
        if order["id"] == order_id:
            order["status"] = new_status
            return jsonify({"message": "Order status updated successfully."}), 200
    return jsonify({"message": "Order not found."}), 404

# Real-time Tracking
@app.route("/orders/<int:order_id>/track", methods=["GET"])
def track_order(order_id):
    for order in orders:
        if order["id"] == order_id:
            return jsonify({"status": order["status"], "location": "Current location of the delivery executive"})
    return jsonify({"message": "Order not found."}), 404

# Secure Payment Integration
@app.route("/payments", methods=["POST"])
def make_payment():
    data = request.get_json()
    order_id = data.get("order_id")
    payment_details = data.get("payment_details")
    
    for order in orders:
        if order["id"] == order_id:
            order["payment_details"] = payment_details
            return jsonify({"message": "Payment successful."}), 200
    return jsonify({"message": "Order not found."}), 404

# Rating and Review System
@app.route("/restaurants/<int:restaurant_id>/reviews", methods=["POST"])
def add_review(restaurant_id):
    data = request.get_json()
    rating = data.get("rating")
    comment = data.get("comment")
    
    for restaurant in restaurants:
        if restaurant["id"] == restaurant_id:
            review = {"rating": rating, "comment": comment}
            if "reviews" not in restaurant:
                restaurant["reviews"] = [review]
            else:
                restaurant["reviews"].append(review)
            return jsonify({"message": "Review added successfully."}), 201
    return jsonify({"message": "Restaurant not found."}), 404

@app.route("/restaurants/<int:restaurant_id>/reviews", methods=["GET"])
def get_reviews(restaurant_id):
    for restaurant in restaurants:
        if restaurant["id"] == restaurant_id:
            if "reviews" in restaurant:
                return jsonify(restaurant["reviews"])
            else:
                return jsonify([])
    return jsonify({"message": "Restaurant not found."}), 404

# Delivery Optimization
@app.route("/deliveries", methods=["GET"])
def get_deliveries():
    return jsonify(deliveries)

@app.route("/deliveries/<int:delivery_id>", methods=["GET"])
def get_delivery(delivery_id):
    for delivery in deliveries:
        if delivery["id"] == delivery_id:
            return jsonify(delivery)
    return jsonify({"message": "Delivery not found."}), 404

@app.route("/deliveries", methods=["POST"])
def assign_delivery():
    data = request.get_json()
    order_id = data.get("order_id")
    delivery_executive_id = data.get("delivery_executive_id")
    
    for order in orders:
        if order["id"] == order_id:
            delivery = {"order_id": order_id, "delivery_executive_id": delivery_executive_id, "status": "Assigned"}
            deliveries.append(delivery)
            return jsonify({"message": "Delivery assigned successfully."}), 201
    return jsonify({"message": "Order not found."}), 404

@app.route("/deliveries/<int:delivery_id>", methods=["PATCH"])
def update_delivery_status(delivery_id):
    data = request.get_json()
    new_status = data.get("status")
    
    for delivery in deliveries:
        if delivery["id"] == delivery_id:
            delivery["status"] = new_status
            return jsonify({"message": "Delivery status updated successfully."}), 200
    return jsonify({"message": "Delivery not found."}), 404

@app.route("/deliveries/<int:delivery_id>", methods=["DELETE"])
def cancel_delivery(delivery_id):
    for delivery in deliveries:
        if delivery["id"] == delivery_id:
            deliveries.remove(delivery)
            return jsonify({"message": "Delivery canceled successfully."}), 200
    return jsonify({"message": "Delivery not found."}), 404

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

from flask import Flask, jsonify

app = Flask(__name__)

# Mock data for demonstration purposes
orders = [
    {"id": 1, "status": "Pending"},
    {"id": 2, "status": "Delivered"},
    {"id": 3, "status": "In Progress"}
]

restaurants = [
    {"id": 1, "name": "Restaurant A", "location": "City X"},
    {"id": 2, "name": "Restaurant B", "location": "City Y"},
    {"id": 3, "name": "Restaurant C", "location": "City Z"}
]

deliveries = []

# Order API
@app.route("/orders", methods=["GET"])
def get_orders():
    return jsonify(orders)

@app.route("/orders/<int:order_id>", methods=["GET"])
def get_order(order_id):
    for order in orders:
        if order["id"] == order_id:
            return jsonify(order)
    return jsonify({"message": "Order not found."}), 404

@app.route("/orders/<int:order_id>", methods=["PATCH"])
def update_order_status(order_id):
    data = request.get_json()
    new_status = data.get("status")
    
    for order in orders:
        if order["id"] == order_id:
            order["status"] = new_status
            return jsonify({"message": "Order status updated successfully."}), 200
    
    return jsonify({"message": "Order not found."}), 404

@app.route("/orders/<int:order_id>", methods=["DELETE"])
def cancel_order(order_id):
    for order in orders:
        if order["id"] == order_id:
            orders.remove(order)
            return jsonify({"message": "Order canceled successfully."}), 200
    return jsonify({"message": "Order not found."}), 404

# Restaurant API
@app.route("/restaurants", methods=["GET"])
def get_restaurants():
    return jsonify(restaurants)

@app.route("/restaurants/<int:restaurant_id>", methods=["GET"])
def get_restaurant(restaurant_id):
    for restaurant in restaurants:
        if restaurant["id"] == restaurant_id:
            return jsonify(restaurant)
    return jsonify({"message": "Restaurant not found."}), 404

@app.route("/restaurants", methods=["POST"])
def add_restaurant():
    data = request.get_json()
    name = data.get("name")
    location = data.get("location")
    
    if name and location:
        new_restaurant = {"id": len(restaurants) + 1, "name": name, "location": location}
        restaurants.append(new_restaurant)
        return jsonify({"message": "Restaurant added successfully."}), 201
    else:
        return jsonify({"message": "Invalid data provided."}), 400

@app.route("/restaurants/<int:restaurant_id>", methods=["PATCH"])
def update_restaurant(restaurant_id):
    data = request.get_json()
    name = data.get("name")
    location = data.get("location")
    
    for restaurant in restaurants:
        if restaurant["id"] == restaurant_id:
            if name:
                restaurant["name"] = name
            if location:
                restaurant["location"] = location
            return jsonify({"message": "Restaurant updated successfully."}), 200
    
    return jsonify({"message": "Restaurant not found."}), 404

@app.route("/restaurants/<int:restaurant_id>", methods=["DELETE"])
def remove_restaurant(restaurant_id):
    for restaurant in restaurants:
        if restaurant["id"] == restaurant_id:
            restaurants.remove(restaurant)
            return jsonify({"message": "Restaurant removed successfully."}), 200
    
    return jsonify({"message": "Restaurant not found."}), 404

# Delivery API
@app.route("/deliveries", methods=["POST"])
def assign_delivery():
    data = request.get_json()
    order_id = data.get("order_id")
    delivery_executive_id = data.get("delivery_executive_id")
    
    if order_id and delivery_executive_id:
        delivery = {"order_id": order_id, "delivery_executive_id": delivery_executive_id}
        deliveries.append(delivery)
        return jsonify({"message": "Delivery assigned successfully."}), 201
    else:
        return jsonify({"message": "Invalid data provided."}), 400

@app.route("/deliveries/<int:delivery_id>", methods=["GET"])
def get_delivery(delivery_id):
    for delivery in deliveries:
        if delivery["id"] == delivery_id:
            return jsonify(delivery)
    return jsonify({"message": "Delivery not found."}), 404

@app.route("/deliveries/<int:delivery_id>", methods=["PATCH"])
def update_delivery_status(delivery_id):
    data = request.get_json()
    new_status = data.get("status")
    
    for delivery in deliveries:
        if delivery["id"] == delivery_id:
            delivery["status"] = new_status
            return jsonify({"message": "Delivery status updated successfully."}), 200
    
    return jsonify({"message": "Delivery not found."}), 404

@app.route("/deliveries/<int:delivery_id>", methods=["DELETE"])
def cancel_delivery(delivery_id):
    for delivery in deliveries:
        if delivery["id"] == delivery_id:
            deliveries.remove(delivery)
            return jsonify({"message": "Delivery canceled successfully."}), 200
    return jsonify({"message": "Delivery not found."}), 404

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

from flask import Flask, jsonify, request

app = Flask(__name__)

# Sample data structures to simulate database storage
users = []
products = []
orders = []

# User Service
@app.route('/users', methods=['POST'])
def register_user():
    data = request.get_json()
    new_user = {
        'user_id': len(users) + 1,
        'username': data['username'],
        'password': data['password'],
        'email': data['email']
    }
    users.append(new_user)
    return jsonify(new_user), 201

# Product Service
@app.route('/products', methods=['POST'])
def create_product():
    data = request.get_json()
    new_product = {
        'product_id': len(products) + 1,
        'name': data['name'],
        'description': data['description'],
        'price': data['price'],
        'inventory': data['inventory']
    }
    products.append(new_product)
    return jsonify(new_product), 201

# Order Service
@app.route('/orders', methods=['POST'])
def place_order():
    data = request.get_json()
    user_id = data['user_id']
    product_id = data['product_id']
    quantity = data['quantity']

    # Check if the user and product exist
    user = next((user for user in users if user['user_id'] == user_id), None)
    product = next((product for product in products if product['product_id'] == product_id), None)

    if user and product and product['inventory'] >= quantity:
        new_order = {
            'order_id': len(orders) + 1,
            'user_id': user_id,
            'product_id': product_id,
            'quantity': quantity
        }
        orders.append(new_order)

        # Reduce product inventory
        product['inventory'] -= quantity

        return jsonify(new_order), 201
    else:
        return jsonify({'message': 'Order placement failed. Invalid user, product, or insufficient inventory.'}), 404

# Feed Generation Service
@app.route('/feed/<int:user_id>', methods=['GET'])
def generate_feed(user_id):
    # Retrieve user's preferences, followed sellers, and browsing history
    # Perform feed aggregation and ranking algorithm
    # Return personalized feed for the user
    return jsonify({'message': f'Feed generated for user {user_id}'}), 200

# Review Service
@app.route('/products/<int:product_id>/reviews', methods=['POST'])
def leave_review(product_id):
    data = request.get_json()
    user_id = data['user_id']
    rating = data['rating']
    comment = data['comment']

    # Check if the product exists
    product = next((product for product in products if product['product_id'] == product_id), None)

    if product:
        new_review = {
            'user_id': user_id,
            'product_id': product_id,
            'rating': rating,
            'comment': comment
        }
        # Save the review to the database or data storage

        return jsonify(new_review), 201
    else:
        return jsonify({'message': 'Product not found'}), 404

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

class User:
    def __init__(self, user_id, username, password):
        self.user_id = user_id
        self.username = username
        self.password = password
        # Other user attributes
        
class Product:
    def __init__(self, product_id, name, description, price, inventory):
        self.product_id = product_id
        self.name = name
        self.description = description
        self.price = price
        self.inventory = inventory
        # Other product attributes
        
class Order:
    def __init__(self, order_id, user, product, quantity):
        self.order_id = order_id
        self.user = user
        self.product = product
        self.quantity = quantity
        # Other order attributes
        
class Lazada:
    def __init__(self):
        self.users = {}
        self.products = {}
        self.orders = []
        
    def add_user(self, user):
        self.users[user.user_id] = user
        
    def get_user_by_id(self, user_id):
        return self.users.get(user_id)
        
    def add_product(self, product):
        self.products[product.product_id] = product
        
    def create_order(self, user_id, product_id, quantity):
        user = self.get_user_by_id(user_id)
        product = self.products.get(product_id)
        
        if user is None or product is None:
            print("User or product not found")
            return
        
        order_id = len(self.orders) + 1
        order = Order(order_id, user, product, quantity)
        self.orders.append(order)

from flask import Flask, jsonify, request

app = Flask(__name__)

lazada = Lazada()

@app.route('/users', methods=['POST'])
def create_user():
    data = request.get_json()
    user_id = data['user_id']
    username = data['username']
    password = data['password']
    
    user = User(user_id, username, password)
    lazada.add_user(user)
    
    return jsonify({'message': 'User created successfully'}), 201

@app.route('/users/<int:user_id>', methods=['GET'])
def get_user(user_id):
    user = lazada.get_user_by_id(user_id)
    
    if user is None:
        return jsonify({'message': 'User not found'}), 404
    
    return jsonify({'user_id': user.user_id, 'username': user.username}), 200

@app.route('/products', methods=['POST'])
def create_product():
    data = request.get_json()
    product_id = data['product_id']
    name = data['name']
    description = data['description']
    price = data['price']
    inventory = data['inventory']
    
    product = Product(product_id, name, description, price, inventory)
    lazada.add_product(product)
    
    return jsonify({'message': 'Product created successfully'}), 201

@app.route('/orders', methods=['POST'])
def create_order():
    data = request.get_json()
    user_id = data['user_id']
    product_id = data['product_id']
    quantity = data['quantity']
    
    lazada.create_order(user_id, product_id, quantity)
    
    return jsonify({'message': 'Order created successfully'}), 201

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

User API:

Endpoint: /users
Functionality:
GET /users/{user_id}: Get user details by user ID.
POST /users: Create a new user.
PUT /users/{user_id}: Update user details by user ID.
DELETE /users/{user_id}: Delete a user by user ID.
Product API:

Endpoint: /products
Functionality:
GET /products/{product_id}: Get product details by product ID.
POST /products: Create a new product.
PUT /products/{product_id}: Update product details by product ID.
DELETE /products/{product_id}: Delete a product by product ID.
Order API:

Endpoint: /orders
Functionality:
GET /orders/{order_id}: Get order details by order ID.
POST /orders: Create a new order.
PUT /orders/{order_id}: Update order details by order ID.
DELETE /orders/{order_id}: Delete an order by order ID.
Review API:

Endpoint: /reviews
Functionality:
GET /reviews/{review_id}: Get review details by review ID.
POST /reviews: Create a new review.
PUT /reviews/{review_id}: Update review details by review ID.
DELETE /reviews/{review_id}: Delete a review by review ID.

from flask import Flask, jsonify, request

app = Flask(__name__)

# Sample User Model
class User:
    def __init__(self, user_id, name, email, address):
        self.user_id = user_id
        self.name = name
        self.email = email
        self.address = address

    @classmethod
    def get_by_id(cls, user_id):
        # Logic to fetch user details from the database by user ID
        # Sample implementation:
        users = [
            User(1, 'John Doe', '[email protected]', '123 Main St'),
            User(2, 'Jane Smith', '[email protected]', '456 Elm St')
        ]
        for user in users:
            if user.user_id == user_id:
                return user
        return None

    def save(self):
        # Logic to save/update user details in the database
        # Sample implementation: In this example, we don't persist the data, just return the user object as is.
        return self

    def delete(self):
        # Logic to delete the user from the database
        # Sample implementation: In this example, we don't persist the data, just return None.
        return None

    def to_dict(self):
        # Convert User object to a dictionary
        return {
            'user_id': self.user_id,
            'name': self.name,
            'email': self.email,
            'address': self.address
        }

# User API
@app.route('/users/<int:user_id>', methods=['GET'])
def get_user(user_id):
    user = User.get_by_id(user_id)
    if user:
        return jsonify(user.to_dict()), 200
    else:
        return jsonify({'message': 'User not found'}), 404

@app.route('/users', methods=['POST'])
def create_user():
    data = request.get_json()
    new_user = User(None, data['name'], data['email'], data['address'])
    saved_user = new_user.save()
    return jsonify(saved_user.to_dict()), 201

@app.route('/users/<int:user_id>', methods=['PUT'])
def update_user(user_id):
    user = User.get_by_id(user_id)
    if user:
        data = request.get_json()
        user.name = data['name']
        user.email = data['email']
        user.address = data['address']
        updated_user = user.save()
        return jsonify(updated_user.to_dict()), 200
    else:
        return jsonify({'message': 'User not found'}), 404

@app.route('/users/<int:user_id>', methods=['DELETE'])
def delete_user(user_id):
    user = User.get_by_id(user_id)
    if user:
        deleted_user = user.delete()
        return jsonify({'message': 'User deleted successfully'}), 200
    else:
        return jsonify({'message': 'User not found'}), 404

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

from flask import Flask, jsonify, request

app = Flask(__name__)

# Sample data structures to simulate database storage
users = []
products = []
cart = []

# User Registration and Authentication
@app.route('/users', methods=['POST'])
def register_user():
    data = request.get_json()
    new_user = {
        'user_id': len(users) + 1,
        'username': data['username'],
        'password': data['password'],
        'email': data['email']
    }
    users.append(new_user)
    return jsonify(new_user), 201

# Product Catalog
@app.route('/products', methods=['GET'])
def get_products():
    return jsonify(products), 200

# Product Listing and Management
@app.route('/products', methods=['POST'])
def list_product():
    data = request.get_json()
    new_product = {
        'product_id': len(products) + 1,
        'name': data['name'],
        'price': data['price'],
        'description': data['description'],
        'inventory': data['inventory']
    }
    products.append(new_product)
    return jsonify(new_product), 201

@app.route('/products/<int:product_id>', methods=['PUT'])
def update_product(product_id):
    product = next((product for product in products if product['product_id'] == product_id), None)
    if product:
        data = request.get_json()
        product['name'] = data['name']
        product['price'] = data['price']
        product['description'] = data['description']
        product['inventory'] = data['inventory']
        return jsonify(product), 200
    else:
        return jsonify({'message': 'Product not found'}), 404

# Shopping Cart and Checkout
@app.route('/cart', methods=['GET'])
def view_cart():
    return jsonify(cart), 200

@app.route('/cart', methods=['POST'])
def add_to_cart():
    data = request.get_json()
    product_id = data['product_id']
    quantity = data['quantity']
    product = next((product for product in products if product['product_id'] == product_id), None)
    if product and product['inventory'] >= quantity:
        cart.append({
            'product_id': product['product_id'],
            'name': product['name'],
            'price': product['price'],
            'quantity': quantity
        })
        return jsonify({'message': 'Product added to cart successfully'}), 200
    else:
        return jsonify({'message': 'Product not found or insufficient inventory'}), 404

@app.route('/checkout', methods=['POST'])
def checkout():
    # Perform payment and order confirmation logic
    # ...

# Reviews and Ratings
@app.route('/products/<int:product_id>/reviews', methods=['POST'])
def leave_review(product_id):
    data = request.get_json()
    review = {
        'product_id': product_id,
        'rating': data['rating'],
        'comment': data['comment']
    }
    # Save the review to the database or data storage
    # ...

# Order Management
@app.route('/orders', methods=['GET'])
def get_orders():
    # Retrieve and return the list of orders from the database or data storage
    # ...

# Payment Gateway Integration
@app.route('/payment', methods=['POST'])
def make_payment():
    data = request.get_json()
    # Process payment using the payment gateway API
    # ...

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

from flask import Flask, jsonify, request

app = Flask(__name__)

# Sample data structures to simulate a database
users = []
products = []
orders = []
reviews = []

# User API
@app.route('/users/<int:user_id>', methods=['GET'])
def get_user(user_id):
    user = next((user for user in users if user['user_id'] == user_id), None)
    if user:
        return jsonify(user), 200
    else:
        return jsonify({'message': 'User not found'}), 404

@app.route('/users', methods=['POST'])
def create_user():
    data = request.get_json()
    new_user = {
        'user_id': len(users) + 1,
        'name': data['name'],
        'email': data['email'],
        'address': data['address']
    }
    users.append(new_user)
    return jsonify(new_user), 201

@app.route('/users/<int:user_id>', methods=['PUT'])
def update_user(user_id):
    user = next((user for user in users if user['user_id'] == user_id), None)
    if user:
        data = request.get_json()
        user['name'] = data['name']
        user['email'] = data['email']
        user['address'] = data['address']
        return jsonify(user), 200
    else:
        return jsonify({'message': 'User not found'}), 404

@app.route('/users/<int:user_id>', methods=['DELETE'])
def delete_user(user_id):
    user = next((user for user in users if user['user_id'] == user_id), None)
    if user:
        users.remove(user)
        return jsonify({'message': 'User deleted successfully'}), 200
    else:
        return jsonify({'message': 'User not found'}), 404

# Product API
@app.route('/products/<int:product_id>', methods=['GET'])
def get_product(product_id):
    product = next((product for product in products if product['product_id'] == product_id), None)
    if product:
        return jsonify(product), 200
    else:
        return jsonify({'message': 'Product not found'}), 404

@app.route('/products', methods=['POST'])
def create_product():
    data = request.get_json()
    new_product = {
        'product_id': len(products) + 1,
        'name': data['name'],
        'price': data['price'],
        'description': data['description']
    }
    products.append(new_product)
    return jsonify(new_product), 201

@app.route('/products/<int:product_id>', methods=['PUT'])
def update_product(product_id):
    product = next((product for product in products if product['product_id'] == product_id), None)
    if product:
        data = request.get_json()
        product['name'] = data['name']
        product['price'] = data['price']
        product['description'] = data['description']
        return jsonify(product), 200
    else:
        return jsonify({'message': 'Product not found'}), 404

@app.route('/products/<int:product_id>', methods=['DELETE'])
def delete_product(product_id):
    product = next((product for product in products if product['product_id'] == product_id), None)
    if product:
        products.remove(product)
        return jsonify({'message': 'Product deleted successfully'}), 200
    else:
        return jsonify({'message': 'Product not found'}), 404

# Order API
@app.route('/orders/<int:order_id>', methods=['GET'])
def get_order(order_id):
    order = next((order for order in orders if order['order_id'] == order_id), None)
    if order:
        return jsonify(order), 200
    else:
        return jsonify({'message': 'Order not found'}), 404

@app.route('/orders', methods=['POST'])
def create_order():
    data = request.get_json()
    new_order = {
        'order_id': len(orders) + 1,
        'user_id': data['user_id'],
        'product_id': data['product_id'],
        'quantity': data['quantity']
    }
    orders.append(new_order)
    return jsonify(new_order), 201

@app.route('/orders/<int:order_id>', methods=['PUT'])
def update_order(order_id):
    order = next((order for order in orders if order['order_id'] == order_id), None)
    if order:
        data = request.get_json()
        order['user_id'] = data['user_id']
        order['product_id'] = data['product_id']
        order['quantity'] = data['quantity']
        return jsonify(order), 200
    else:
        return jsonify({'message': 'Order not found'}), 404

@app.route('/orders/<int:order_id>', methods=['DELETE'])
def delete_order(order_id):
    order = next((order for order in orders if order['order_id'] == order_id), None)
    if order:
        orders.remove(order)
        return jsonify({'message': 'Order deleted successfully'}), 200
    else:
        return jsonify({'message': 'Order not found'}), 404

# Review API
@app.route('/reviews/<int:review_id>', methods=['GET'])
def get_review(review_id):
    review = next((review for review in reviews if review['review_id'] == review_id), None)
    if review:
        return jsonify(review), 200
    else:
        return jsonify({'message': 'Review not found'}), 404

@app.route('/reviews', methods=['POST'])
def create_review():
    data = request.get_json()
    new_review = {
        'review_id': len(reviews) + 1,
        'user_id': data['user_id'],
        'product_id': data['product_id'],
        'rating': data['rating'],
        'comment': data['comment']
    }
    reviews.append(new_review)
    return jsonify(new_review), 201

@app.route('/reviews/<int:review_id>', methods=['PUT'])
def update_review(review_id):
    review = next((review for review in reviews if review['review_id'] == review_id), None)
    if review:
        data = request.get_json()
        review['user_id'] = data['user_id']
        review['product_id'] = data['product_id']
        review['rating'] = data['rating']
        review['comment'] = data['comment']
        return jsonify(review), 200
    else:
        return jsonify({'message': 'Review not found'}), 404

@app.route('/reviews/<int:review_id>', methods=['DELETE'])
def delete_review(review_id):
    review = next((review for review in reviews if review['review_id'] == review_id), None)
    if review:
        reviews.remove(review)
        return jsonify({'message': 'Review deleted successfully'}), 200
    else:
        return jsonify({'message': 'Review not found'}), 404

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

class UserService:
    def register_user(self, username, email, password):
        # Logic to register a new user
        user_id = generate_user_id()  # Generate a unique user ID
        # Save user details in the database or data store
        user = {"user_id": user_id, "username": username, "email": email, "password": password}
        save_user(user)
        return user_id

    def login_user(self, email, password):
        # Logic to authenticate and login a user
        user = get_user_by_email(email)
        if user and user["password"] == password:
            return user["user_id"]
        return None

    def get_user_profile(self, user_id):
        # Logic to retrieve user profile details
        return get_user_by_id(user_id)


class RestaurantService:
    def add_restaurant(self, name, cuisine, rating):
        # Logic to add a new restaurant
        restaurant_id = generate_restaurant_id()  # Generate a unique restaurant ID
        # Save restaurant details in the database or data store
        restaurant = {"restaurant_id": restaurant_id, "name": name, "cuisine": cuisine, "rating": rating}
        save_restaurant(restaurant)
        return restaurant_id

    def get_restaurant_menu(self, restaurant_id):
        # Logic to retrieve the menu of a restaurant
        return get_menu_items_by_restaurant_id(restaurant_id)

    def update_menu_item_availability(self, menu_item_id, availability):
        # Logic to update the availability of a menu item
        update_menu_item_availability_in_db(menu_item_id, availability)


class OrderService:
    def place_order(self, user_id, restaurant_id, item_id, quantity):
        # Logic to place an order
        order_id = generate_order_id()  # Generate a unique order ID
        timestamp = generate_timestamp()  # Generate the current timestamp
        # Save order details in the database or data store
        order = {"order_id": order_id, "user_id": user_id, "restaurant_id": restaurant_id, "item_id": item_id,
                 "quantity": quantity, "timestamp": timestamp}
        save_order(order)
        return order_id

    def track_order(self, order_id):
        # Logic to track an order
        return get_order_by_id(order_id)

    def get_user_orders(self, user_id):
        # Logic to retrieve all orders for a user
        return get_orders_by_user_id(user_id)


class PaymentService:
    def process_payment(self, user_id, order_id, amount):
        # Logic to process payment for an order
        transaction_id = generate_transaction_id()  # Generate a unique transaction ID
        # Save payment details in the database or data store
        payment = {"transaction_id": transaction_id, "user_id": user_id, "order_id": order_id, "amount": amount}
        save_payment(payment)
        return transaction_id


class FeedGenerationService:
    def generate_feed(self, user_id):
        # Logic to generate the personalized feed for a user
        followed_restaurants = get_followed_restaurants(user_id)
        feed = []
        for restaurant_id in followed_restaurants:
            menu_items = get_menu_items_by_restaurant_id(restaurant_id)
            feed.extend(menu_items)
        return feed


class RatingAndReviewService:
    def add_review(self, user_id, restaurant_id, rating, comment):
        # Logic to add a review for a restaurant
        review_id = generate_review_id()  # Generate a unique review ID
        timestamp = generate_timestamp()  # Generate the current timestamp
        # Save review details in the database or data store
        review = {"review_id": review_id, "user_id": user_id, "restaurant_id": restaurant_id, "rating": rating,
                  "comment": comment, "timestamp": timestamp}
        save_review(review)
        return review_id

    def add_reply(self, review_id, user_id, reply):
        # Logic to add a reply to a review
        reply_id = generate_reply_id()  # Generate a unique reply ID
        timestamp = generate_timestamp()  # Generate the current timestamp
        # Save reply details in the database or data store
        reply = {"reply_id": reply_id, "review_id": review_id, "user_id": user_id, "reply": reply,
                 "timestamp": timestamp}
        save_reply(reply)
        return reply_id

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

class Restaurant:
    def __init__(self, restaurant_id, name, cuisine):
        self.restaurant_id = restaurant_id
        self.name = name
        self.cuisine = cuisine
        # Other restaurant attributes

class MenuItem:
    def __init__(self, item_id, restaurant_id, name, price):
        self.item_id = item_id
        self.restaurant_id = restaurant_id
        self.name = name
        self.price = price
        # Other menu item attributes

class Order:
    def __init__(self, order_id, user_id, restaurant_id, item_id, quantity):
        self.order_id = order_id
        self.user_id = user_id
        self.restaurant_id = restaurant_id
        self.item_id = item_id
        self.quantity = quantity
        # Other order attributes

class Payment:
    def __init__(self, payment_id, user_id, order_id, amount):
        self.payment_id = payment_id
        self.user_id = user_id
        self.order_id = order_id
        self.amount = amount
        # Other payment attributes

# Additional classes for Feed, Rating, etc.

from flask import Flask, jsonify, request

app = Flask(__name__)

# Sample data for demonstration purposes
users = [
    {"id": "12345", "name": "John Doe", "email": "[email protected]", "password": "secretpassword"}
]

restaurants = [
    {"id": "54321", "name": "Example Restaurant", "cuisine": "Italian", "rating": 4.5},
    {"id": "67890", "name": "Another Restaurant", "cuisine": "Mexican", "rating": 4.2}
]

menu_items = [
    {"id": "111", "name": "Margherita Pizza", "price": 10.99},
    {"id": "222", "name": "Chicken Tikka Masala", "price": 12.99}
]

orders = []

# User Registration API
@app.route('/api/users', methods=['POST'])
def register_user():
    new_user = {
        "id": str(len(users) + 1),
        "name": request.json["name"],
        "email": request.json["email"],
        "password": request.json["password"]
    }
    users.append(new_user)
    return jsonify({"message": "User registered successfully", "user_id": new_user["id"]}), 201

# Restaurant Search API
@app.route('/api/restaurants', methods=['GET'])
def search_restaurants():
    location = request.args.get('location')
    cuisine = request.args.get('cuisine')
    
    filtered_restaurants = []
    for restaurant in restaurants:
        if (not cuisine or cuisine.lower() == restaurant["cuisine"].lower()) and (not location or location.lower() in restaurant["name"].lower()):
            filtered_restaurants.append(restaurant)
    
    return jsonify({"restaurants": filtered_restaurants}), 200

# Order Placement API
@app.route('/api/orders', methods=['POST'])
def place_order():
    user_id = request.json["user_id"]
    restaurant_id = request.json["restaurant_id"]
    items = request.json["items"]
    
    # Check if user and restaurant exist
    user = next((user for user in users if user["id"] == user_id), None)
    restaurant = next((restaurant for restaurant in restaurants if restaurant["id"] == restaurant_id), None)
    
    if not user or not restaurant:
        return jsonify({"error": "User or restaurant not found"}), 404
    
    # Validate menu items
    valid_items = []
    total_price = 0
    for item in items:
        menu_item = next((menu_item for menu_item in menu_items if menu_item["id"] == item["menu_item_id"]), None)
        if menu_item:
            valid_items.append({
                "menu_item_id": item["menu_item_id"],
                "quantity": item["quantity"]
            })
            total_price += menu_item["price"] * item["quantity"]
    
    # Create new order
    new_order = {
        "order_id": str(len(orders) + 1),
        "user_id": user_id,
        "restaurant_id": restaurant_id,
        "items": valid_items,
        "total_price": total_price
    }
    orders.append(new_order)
    
    return jsonify({"message": "Order placed successfully", "order_id": new_order["order_id"]}), 201

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

class Restaurant:
    def __init__(self, name, cuisine, rating, reviews):
        self.name = name
        self.cuisine = cuisine
        self.rating = rating
        self.reviews = reviews

class Grubhub:
    def __init__(self):
        self.restaurants = []

    def add_restaurant(self, restaurant):
        self.restaurants.append(restaurant)

    def search_restaurants(self, location, cuisine=None):
        results = []
        for restaurant in self.restaurants:
            if (not cuisine or cuisine.lower() == restaurant.cuisine.lower()) and (location.lower() in restaurant.name.lower()):
                results.append(restaurant)
        return results

class MenuItem:
    def __init__(self, name, availability, customizations=None):
        self.name = name
        self.availability = availability
        self.customizations = customizations or []

class Restaurant:
    def __init__(self, name, cuisine, rating, reviews):
        self.name = name
        self.cuisine = cuisine
        self.rating = rating
        self.reviews = reviews
        self.menu = []

    def add_menu_item(self, menu_item):
        self.menu.append(menu_item)

    def update_menu_item_availability(self, menu_item_name, availability):
        for menu_item in self.menu:
            if menu_item.name == menu_item_name:
                menu_item.availability = availability
                break

    def add_customization_to_menu_item(self, menu_item_name, customization):
        for menu_item in self.menu:
            if menu_item.name == menu_item_name:
                menu_item.customizations.append(customization)
                break

class Order:
    def __init__(self, user_id, restaurant_id, items):
        self.user_id = user_id
        self.restaurant_id = restaurant_id
        self.items = items
        self.status = "Placed"

    def update_status(self, status):
        self.status = status

class Grubhub:
    def __init__(self):
        self.orders = []

    def place_order(self, user_id, restaurant_id, items):
        new_order = Order(user_id, restaurant_id, items)
        self.orders.append(new_order)
        return new_order

    def track_order(self, order_id):
        for order in self.orders:
            if order.id == order_id:
                return order
        return None

class PaymentProcessor:
    def __init__(self):
        # Initialize payment processor

    def process_payment(self, user_id, amount, payment_method):
        # Process payment using the specified payment method and return transaction details
        transaction_id = "123456789"
        return transaction_id

class Restaurant:
    def __init__(self, name, cuisine, rating, reviews):
        self.name = name
        self.cuisine = cuisine
        self.rating = rating
        self.reviews = reviews

    def add_review(self, review):
        self.reviews.append(review)

class Review:
    def __init__(self, user_id, rating, comment):
        self.user_id = user_id
        self.rating = rating
        self.comment = comment

from flask import Flask, request, jsonify

app = Flask(__name__)

# Sample data to be stored in the server
users = {
    "user1": {
        "name": "John Doe",
        "email": "[email protected]",
        "password": "password123"
    },
    "user2": {
        "name": "Jane Smith",
        "email": "[email protected]",
        "password": "password456"
    }
}

restaurants = {
    "restaurant1": {
        "name": "Restaurant A",
        "cuisine": "Italian"
    },
    "restaurant2": {
        "name": "Restaurant B",
        "cuisine": "Mexican"
    }
}

menu_items = {
    "menu_item1": {
        "name": "Pizza",
        "price": 9.99
    },
    "menu_item2": {
        "name": "Taco",
        "price": 5.99
    }
}

orders = {
    "order1": {
        "user_id": "user1",
        "restaurant_id": "restaurant1",
        "item_id": "menu_item1",
        "quantity": 2
    }
}

@app.route("/users", methods=["POST"])
def create_user():
    user_id = request.json.get("user_id")
    name = request.json.get("name")
    email = request.json.get("email")
    password = request.json.get("password")

    users[user_id] = {
        "name": name,
        "email": email,
        "password": password
    }

    return jsonify({"message": "User created successfully"}), 201

@app.route("/users/<user_id>", methods=["GET"])
def get_user(user_id):
    if user_id in users:
        return jsonify(users[user_id]), 200
    else:
        return jsonify({"message": "User not found"}), 404

@app.route("/restaurants", methods=["POST"])
def add_restaurant():
    restaurant_id = request.json.get("restaurant_id")
    name = request.json.get("name")
    cuisine = request.json.get("cuisine")

    restaurants[restaurant_id] = {
        "name": name,
        "cuisine": cuisine
    }

    return jsonify({"message": "Restaurant added successfully"}), 201

@app.route("/restaurants/<restaurant_id>", methods=["GET"])
def get_restaurant(restaurant_id):
    if restaurant_id in restaurants:
        return jsonify(restaurants[restaurant_id]), 200
    else:
        return jsonify({"message": "Restaurant not found"}), 404

@app.route("/restaurants/<restaurant_id>/menu", methods=["POST"])
def add_menu_item(restaurant_id):
    item_id = request.json.get("item_id")
    name = request.json.get("name")
    price = request.json.get("price")

    menu_items[item_id] = {
        "name": name,
        "price": price
    }

    return jsonify({"message": "Menu item added successfully"}), 201

@app.route("/restaurants/<restaurant_id>/menu/<item_id>", methods=["GET"])
def get_menu_item(restaurant_id, item_id):
    if item_id in menu_items:
        return jsonify(menu_items[item_id]), 200
    else:
        return jsonify({"message": "Menu item not found"}), 404

@app.route("/users/<user_id>/orders", methods=["POST"])
def place_order(user_id):
    order_id = request.json.get("order_id")
    restaurant_id = request.json.get("restaurant_id")
    item_id = request.json.get("item_id")
    quantity = request.json.get("quantity")

    orders[order_id] = {
        "user_id": user_id,
        "restaurant_id": restaurant_id,
        "item_id": item_id,
        "quantity": quantity
    }

    return jsonify({"message": "Order placed successfully"}), 201

@app.route("/users/<user_id>/orders/<order_id>", methods=["GET"])
def get_order(user_id, order_id):
    if order_id in orders:
        return jsonify(orders[order_id]), 200
    else:
        return jsonify({"message": "Order not found"}), 404

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