import time
from datetime import datetime

# Sessions Service
class SessionsService:
    def __init__(self):
        self.sessions = {}

    def start_session(self, user_id):
        session_id = self.generate_session_id()
        self.sessions[session_id] = {"user_id": user_id, "start_time": time.time()}
        return session_id

    def end_session(self, session_id):
        if session_id in self.sessions:
            del self.sessions[session_id]

    def generate_session_id(self):
        # Implement a unique ID generation method
        return "session-id-1"

# Post Service
class PostService:
    def __init__(self):
        self.posts = []

    def create_post(self, user_id, text):
        post_id = self.generate_post_id()
        post = {"id": post_id, "user_id": user_id, "text": text, "timestamp": time.time()}
        self.posts.append(post)
        return post_id

    def get_post(self, post_id):
        for post in self.posts:
            if post["id"] == post_id:
                return post

    def generate_post_id(self):
        # Implement a unique ID generation method
        return "post-id-1"

# Notification Service
class NotificationService:
    def __init__(self):
        self.notifications = []

    def push_notification(self, user_id, text):
        notification_id = self.generate_notification_id()
        notification = {"id": notification_id, "user_id": user_id, "text": text}
        self.notifications.append(notification)
        return notification_id

    def generate_notification_id(self):
        # Implement a unique ID generation method
        return "notification-id-1"

# User Profile Service
class ProfileService:
    def __init__(self):
        self.profiles = {}

    def create_profile(self, user_id, name, email):
        profile = {"user_id": user_id, "name": name, "email": email}
        self.profiles[user_id] = profile
        return profile

    def update_profile(self, user_id, updates):
        if user_id in self.profiles:
            self.profiles[user_id].update(updates)
            return self.profiles[user_id]

# Feed Service
class FeedService:
    def __init__(self, post_service, ranking_service):
        self.post_service = post_service
        self.ranking_service = ranking_service

    def get_feed(self, user_id):
        posts = self.post_service.posts
        ranked_posts = self.ranking_service.rank_posts(posts)
        return [post for post in ranked_posts if post["user_id"] != user_id]

import flask
import pymongo

app = flask.Flask(__name__)

# Connect to the database
client = pymongo.MongoClient("mongodb://localhost:27017/")
db = client["reddit"]
posts = db["posts"]

# Define an endpoint for retrieving a list of posts
@app.route("/posts", methods=["GET"])
def get_posts():
    # Retrieve a list of posts from the database
    post_list = list(posts.find({}))

    # Return the list of posts
    return flask.jsonify(post_list)

# Define an endpoint for creating a new post
@app.route("/posts", methods=["POST"])
def create_post():
    # Retrieve the post information from the request body
    post = flask.request.json

    # Insert the post into the database
    result = posts.insert_one(post)

    # Return success
    return flask.jsonify({})

# Example usage
if __name__ == "__main__":
    app.run(port=5001)

import java.util.*;

class User {
    private String username;
    private String password;
    private List<Post> posts;
    // ...

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

    // Getters and setters
    // ...
}

class Post {
    private String postId;
    private String title;
    private String content;
    private User author;
    private List<Comment> comments;
    // ...

    public Post(String postId, String title, String content, User author) {
        this.postId = postId;
        this.title = title;
        this.content = content;
        this.author = author;
        this.comments = new ArrayList<>();
    }

    // Getters and setters
    // ...
}

class Comment {
    private String commentId;
    private String text;
    private User commenter;
    // ...

    public Comment(String commentId, String text, User commenter) {
        this.commentId = commentId;
        this.text = text;
        this.commenter = commenter;
    }

    // Getters and setters
    // ...
}

class RedditSystem {
    private List<User> users;
    private List<Post> posts;
    // ...

    public RedditSystem() {
        this.users = new ArrayList<>();
        this.posts = new ArrayList<>();
    }

    public void registerUser(String username, String password) {
        User newUser = new User(username, password);
        users.add(newUser);
        System.out.println("User registered successfully.");
    }

    public void createPost(String username, String postId, String title, String content) {
        User author = findUserByUsername(username);
        if (author != null) {
            Post newPost = new Post(postId, title, content, author);
            author.getPosts().add(newPost);
            posts.add(newPost);
            System.out.println("Post created successfully.");
        } else {
            System.out.println("User not found.");
        }
    }

    public void addComment(String postId, String commenterUsername, String commentId, String text) {
        Post post = findPostById(postId);
        User commenter = findUserByUsername(commenterUsername);
        if (post != null && commenter != null) {
            Comment newComment = new Comment(commentId, text, commenter);
            post.getComments().add(newComment);
            System.out.println("Comment added successfully.");
        } else {
            System.out.println("Post or commenter not found.");
        }
    }

    public User findUserByUsername(String username) {
        for (User user : users) {
            if (user.getUsername().equals(username)) {
                return user;
            }
        }
        return null;
    }

    public Post findPostById(String postId) {
        for (Post post : posts) {
            if (post.getPostId().equals(postId)) {
                return post;
            }
        }
        return null;
    }
}

public class RedditApp {
    public static void main(String[] args) {
        RedditSystem reddit = new RedditSystem();

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

        // Create posts
        reddit.createPost("user1", "post1", "Title 1", "Content 1");
        reddit.createPost("user2", "post2", "Title 2", "Content 2");

        // Add comments
        reddit.addComment("post1", "user2", "comment1", "Comment 1 on post 1");
        reddit.addComment("post2", "user1", "comment2", "Comment 2 on post 2");
    }
}

from flask import Flask, request, jsonify

app = Flask(__name__)

@app.route('/api/v1/posts', methods=['GET'])
def get_posts():
    # code to fetch all posts from the database
    return jsonify(posts)

@app.route('/api/v1/posts/<string:id>', methods=['GET'])
def get_post(id):
    # code to fetch a post by id from the database
    return jsonify(post)

@app.route('/api/v1/posts', methods=['POST'])
def add_post():
    # code to add a new post to the database
    return jsonify({'message': 'Post added successfully'})

@app.route('/api/v1/posts/<string:id>', methods=['PUT'])
def update_post(id):
    # code to update a post by id in the database
    return jsonify({'message': 'Post updated successfully'})

@app.route('/api/v1/posts/<string:id>', methods=['DELETE'])
def delete_post(id):
    # code to delete a post by id from the database
    return jsonify({'message': 'Post deleted successfully'})

import flask
import pymongo

app = flask.Flask(__name__)

# Connect to the database
client = pymongo.MongoClient("mongodb://localhost:27017/")
db = client["reddit"]
posts = db["posts"]

# Define an endpoint for retrieving a list of posts
@app.route("/posts", methods=["GET"])
def get_posts():
    # Retrieve a list of posts from the database
    post_list = list(posts.find({}))

    # Return the list of posts
    return flask.jsonify(post_list)

# Define an endpoint for retrieving a specific post
@app.route("/posts/<post_id>", methods=["GET"])
def get_post(post_id):
    # Retrieve the specified post from the database
    post = posts.find_one({"_id": post_id})

    # Return the post
    return flask.jsonify(post)

# Define an endpoint for creating a new post
@app.route("/posts", methods=["POST"])
def create_post():
    # Retrieve the post information from the request body
    post = flask.request.json

    # Insert the post into the database
    result = posts.insert_one(post)

    # Return success
    return flask.jsonify({})

# Example usage
if __name__ == "__main__":
    app.run(port=5001)

import praw

# Authenticate with Reddit API
reddit = praw.Reddit(client_id='CLIENT_ID',
                     client_secret='CLIENT_SECRET',
                     username='USERNAME',
                     password='PASSWORD',
                     user_agent='USER_AGENT')

# Create a post on a subreddit
subreddit = reddit.subreddit('SUBREDDIT_NAME')
title = 'This is the title of my post'
body = 'This is the body of my post'
subreddit.submit(title, selftext=body)

import praw

# Authenticate with Reddit API
reddit = praw.Reddit(client_id='CLIENT_ID',
                     client_secret='CLIENT_SECRET',
                     username='USERNAME',
                     password='PASSWORD',
                     user_agent='USER_AGENT')

# Upvote a post
post = reddit.submission(id='POST_ID')
post.upvote()

# Downvote a post
post.downvote()

import praw

# Authenticate with Reddit API
reddit = praw.Reddit(client_id='CLIENT_ID',
                     client_secret='CLIENT_SECRET',
                     username='USERNAME',
                     password='PASSWORD',
                     user_agent='USER_AGENT')

# Comment on a post
post = reddit.submission(id='POST_ID')
comment_text = 'This is my comment on the post'
post.reply(comment_text)

# Give an award to a post
post.give_award('AWARD_NAME')

# Share a post
post.share()

# Report a post
post.report('RULE_VIOLATION')

import praw

# Authenticate with Reddit API
reddit = praw.Reddit(client_id='CLIENT_ID',
                     client_secret='CLIENT_SECRET',
                     username='USERNAME',
                     password='PASSWORD',
                     user_agent='USER_AGENT')

# Search for a post
results = reddit.subreddit('SUBREDDIT_NAME').search('SEARCH_QUERY')

# Search for a Reddit community
results = reddit.subreddit.search_by_name('SUBREDDIT_NAME')

import praw

# Authenticate with Reddit API
reddit = praw.Reddit(client_id='CLIENT_ID',
                     client_secret='CLIENT_SECRET',
                     username='USERNAME',
                     password='PASSWORD',
                     user_agent='USER_AGENT')

# Submit a picture
subreddit = reddit.subreddit('SUBREDDIT_NAME')
image_path = 'path/to/image.jpg'
subreddit.submit_image(image_path)

# Submit a text post
subreddit = reddit.subreddit('SUBREDDIT_NAME')
title = 'This is the title of my post'
body = 'This is the body of my post'
subreddit.submit(title, selftext=body)

import praw

# Authenticate with Reddit API
reddit = praw.Reddit(client_id='CLIENT_ID',
                     client_secret='CLIENT_SECRET',
                     username='USERNAME',
                     password='PASSWORD',
                     user_agent='USER_AGENT')

# Create community rules
subreddit = reddit.subreddit('SUBREDDIT_NAME')
rules = [
    'Rule 1: Be respectful to others',
    'Rule 2: No spamming or self-promotion',
    'Rule 3: No hate speech or personal attacks'
]
subreddit.mod.update(rules=rules)

import praw

# Authenticate with Reddit API
reddit = praw.Reddit(client_id='CLIENT_ID',
                     client_secret='CLIENT_SECRET',
                     username='USERNAME',
                     password='PASSWORD',
                     user_agent='USER_AGENT')

# Advertise your product on a subreddit
subreddit = reddit.subreddit('SUBREDDIT_NAME')
title = 'Check out my product'
body = 'Here is a link to my website: https://www.example.com'
subreddit.submit(title, selftext=body)

import praw

# Authenticate with Reddit API
reddit = praw.Reddit(client_id='CLIENT_ID',
                     client_secret='CLIENT_SECRET',
                     username='USERNAME',
                     password='PASSWORD',
                     user_agent='USER_AGENT')

# Save a post
post = reddit.submission(id='POST_ID')
post.save()

import praw

# Authenticate with Reddit API
reddit = praw.Reddit(client_id='CLIENT_ID',
                     client_secret='CLIENT_SECRET',
                     username='USERNAME',
                     password='PASSWORD',
                     user_agent='USER_AGENT')

# Add a flair to a post
post = reddit.submission(id='POST_ID')
post.flair.select('FLAIR_NAME')

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

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

    def register_user(self, username, password):
        if username in self.users:
            raise ValueError("Username already exists.")
        user = User(username, password)
        self.users[username] = user

    def authenticate_user(self, username, password):
        user = self.users.get(username)
        if user and user.password == password:
            return True
        return False

    def authorize_user(self, username, role):
        user = self.users.get(username)
        if user:
            user.role = role
        else:
            raise ValueError("User not found.")

# Example usage
user_management = UserManagementSystem()
user_management.register_user("john", "password123")
authenticated = user_management.authenticate_user("john", "password123")
user_management.authorize_user("john", "admin")

class UserProfile:
    def __init__(self, username, name, email):
        self.username = username
        self.name = name
        self.email = email
        self.bio = ""
        self.avatar_url = ""

    def update_bio(self, bio):
        self.bio = bio

    def update_avatar(self, avatar_url):
        self.avatar_url = avatar_url

# Example usage
user_profile = UserProfile("john", "John Doe", "john@example.com")
user_profile.update_bio("I'm a software engineer.")
user_profile.update_avatar("https://example.com/avatar.jpg")

class UserPreferences:
    def __init__(self):
        self.theme = "light"
        self.timezone = "UTC"
        self.subscribed_subreddits = []

    def update_theme(self, theme):
        self.theme = theme

    def update_timezone(self, timezone):
        self.timezone = timezone

    def subscribe_to_subreddit(self, subreddit):
        if subreddit not in self.subscribed_subreddits:
            self.subscribed_subreddits.append(subreddit)

    def unsubscribe_from_subreddit(self, subreddit):
        if subreddit in self.subscribed_subreddits:
            self.subscribed_subreddits.remove(subreddit)

# Example usage
user_preferences = UserPreferences()
user_preferences.update_theme("dark")
user_preferences.update_timezone("GMT+1")
user_preferences.subscribe_to_subreddit("programming")
user_preferences.unsubscribe_from_subreddit("funny")

class Post:
    def __init__(self, title, content, author):
        self.title = title
        self.content = content
        self.author = author
        self.comments = []

    def add_comment(self, comment):
        self.comments.append(comment)

class Comment:
    def __init__(self, content, author):
        self.content = content
        self.author = author

# Example usage
post = Post("Hello, World!", "This is my first post.", "john")
comment1 = Comment("Nice post!", "alice")
comment2 = Comment("I agree with you.", "bob")
post.add_comment(comment1)
post.add_comment(comment2)

class Subreddit:
    def __init__(self, name):
        self.name = name
        self.posts = []

    def add_post(self, post):
        self.posts.append(post)

def get_posts_sorted_by_date(self):
        sorted_posts = sorted(self.posts, key=lambda post: post.date_created,  reverse=True     )      
   return sorted_posts  

subreddit = Subreddit("programming")
post1 = Post("Python Basics", "Learn the fundamentals of Python programming.", "john")
post2 = Post("Web Development", "Discover the world of web development.", "alice")
subreddit.add_post(post1)
subreddit.add_post(post2)
sorted_posts = subreddit.get_posts_sorted_by_date()

class Post:
    def __init__(self, title, content, author):
        self.title = title
        self.content = content
        self.author = author
        self.upvotes = 0
        self.downvotes = 0
        self.saved = False

    def upvote(self):
        self.upvotes += 1

    def downvote(self):
        self.downvotes += 1

    def save(self):
        self.saved = True

# Example usage
post = Post("Hello, World!", "This is my first post.", "john")
post.upvote()
post.upvote()
post.downvote()
post.save()

class Moderator:
    def __init__(self, username):
        self.username = username
        self.permissions = []

    def grant_permission(self, permission):
        if permission not in self.permissions:
            self.permissions.append(permission)

    def revoke_permission(self, permission):
        if permission in self.permissions:
            self.permissions.remove(permission)

# Example usage
moderator = Moderator("alice")
moderator.grant_permission("delete_post")
moderator.revoke_permission("edit_user")

class FlaggedContent:
    def __init__(self, content, reporter):
        self.content = content
        self.reporter = reporter
        self.status = "pending"

    def mark_as_resolved(self):
        self.status = "resolved"

    def mark_as_dismissed(self):
        self.status = "dismissed"

# Example usage
flagged_content = FlaggedContent("Inappropriate post.", "alice")
flagged_content.mark_as_resolved()

class Community:
    def __init__(self, name):
        self.name = name
        self.guidelines = []

    def add_guideline(self, guideline):
        self.guidelines.append(guideline)

    def remove_guideline(self, guideline):
        if guideline in self.guidelines:
            self.guidelines.remove(guideline)

# Example usage
community = Community("programming")
community.add_guideline("No spamming.")
community.add_guideline("Be respectful to others.")
community.remove_guideline("No spamming.")

class Post:
    def __init__(self, title, content, author):
        self.title = title
        self.content = content
        self.author = author
        self.upvotes = 0

    def increase_upvotes(self):
        self.upvotes += 1

class RankingAlgorithm:
    @staticmethod
    def hotness(post):
        return post.upvotes

    @staticmethod
    def relevance(post):
        # Custom relevance calculation
        return post.upvotes * 0.5

# Example usage
post1 = Post("Python Basics", "Learn the fundamentals of Python programming.", "john")
post2 = Post("Web Development", "Discover the world of web development.", "alice")
post1.increase_upvotes()
post2.increase_upvotes()  # Ranking using hotness algorithm hotness_ranking = sorted([post1, post2], key=RankingAlgorithm.hotness, reverse=True)  # Ranking using relevance algorithm relevance_ranking = sorted([post1, post2], key=RankingAlgorithm.relevance, reverse=True)

class PostManager:
    def __init__(self):
        self.posts = []

    def add_post(self, post):
        self.posts.append(post)

    def get_hot_posts(self, limit):
        hot_posts = sorted(self.posts, key=RankingAlgorithm.hotness, reverse=True)
        return hot_posts[:limit]

    def get_top_posts(self, limit):
        top_posts = sorted(self.posts, key=RankingAlgorithm.relevance, reverse=True)
        return top_posts[:limit]

    def get_new_posts(self, limit):
        new_posts = sorted(self.posts, key=lambda post: post.date_created, reverse=True)
        return new_posts[:limit]

# Example usage
post_manager = PostManager()
post1 = Post("Python Basics", "Learn the fundamentals of Python programming.", "john")
post2 = Post("Web Development", "Discover the world of web development.", "alice")
post_manager.add_post(post1)
post_manager.add_post(post2)
hot_posts = post_manager.get_hot_posts(5)
top_posts = post_manager.get_top_posts(5)
new_posts = post_manager.get_new_posts(5)

class User:
    def __init__(self, username):
        self.username = username
        self.liked_posts = []

    def like_post(self, post):
        if post not in self.liked_posts:
            self.liked_posts.append(post)

class RecommendationSystem:
    def __init__(self, post_manager):
        self.post_manager = post_manager

    def recommend_posts(self, user, limit):
        user_liked_posts = user.liked_posts
        all_posts = self.post_manager.posts
        recommended_posts = [post for post in all_posts if post not in user_liked_posts]
        sorted_posts = sorted(recommended_posts, key=RankingAlgorithm.relevance, reverse=True)
        return sorted_posts[:limit]

# Example usage
user = User("john")
user.like_post(post1)
recommendation_system = RecommendationSystem(post_manager)
recommended_posts = recommendation_system.recommend_posts(user, 3)

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

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

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

    def get_messages(self, user):
        user_messages = [message for message in self.messages if message.receiver == user]
        user_messages.sort(key=lambda message: message.timestamp)
        return user_messages

# Example usage
messaging_system = MessagingSystem()
messaging_system.send_message("john", "alice", "Hi Alice, how are you?")
messaging_system.send_message("alice", "john", "Hi John, I'm doing great!")
user_messages = messaging_system.get_messages("john")

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

class NotificationSystem:
    def __init__(self):
        self.notifications = []

    def send_notification(self, recipient, content):
        notification = Notification(recipient, content)
        self.notifications.append(notification)

    def get_notifications(self, recipient):
        user_notifications = [notification for notification in self.notifications if notification.recipient == recipient]
        user_notifications.sort(key=lambda notification: notification.timestamp)
        return user_notifications

# Example usage
notification_system = NotificationSystem()
notification_system.send_notification("john", "You have a new reply.")
notification_system.send_notification("alice", "You were mentioned in a post.")
user_notifications = notification_system.get_notifications("john")

import pusher

class RealTimeUpdateSystem:
    def __init__(self):
        self.pusher = pusher.Pusher(
            app_id="APP_ID",
            key="KEY",
            secret="SECRET",
            cluster="CLUSTER",
            ssl=True
        )

    def send_realtime_update(self, channel, event, data):
        self.pusher.trigger(channel, event, data)

# Example usage
realtime_update_system = RealTimeUpdateSystem()
realtime_update_system.send_realtime_update("notifications", "new_notification", {"message": "You have a new notification."})

class SearchEngine:
    def __init__(self, post_manager):
        self.post_manager = post_manager

    def search_posts(self, query):
        all_posts = self.post_manager.posts
        matching_posts = [post for post in all_posts if query.lower() in post.title.lower()]
        return matching_posts

class SubredditManager:
    def __init__(self):
        self.subreddits = []

    def create_subreddit(self, name):
        subreddit = Subreddit(name)
        self.subreddits.append(subreddit)
        return subreddit

    def search_subreddits(self, query):
        matching_subreddits = [subreddit for subreddit in self.subreddits if query.lower() in subreddit.name.lower()]
        return matching_subreddits

# Example usage
search_engine = SearchEngine(post_manager)
matching_posts = search_engine.search_posts("Python")
subreddit_manager = SubredditManager()
subreddit1 = subreddit_manager.create_subreddit("programming")
subreddit2 = subreddit_manager.create_subreddit("python")
matching_subreddits = subreddit_manager.search_subreddits("python")

class RankingAlgorithm:
    @staticmethod
    def relevance(post, query):
        # Custom relevance calculation based on post content and query
        return len(post.content) - post.content.lower().count(query.lower())

# Example usage
matching_posts = search_engine.search_posts("Python")
sorted_posts = sorted(matching_posts, key=lambda post: RankingAlgorithm.relevance(post, "Python"), reverse=True)

import whoosh.index as index
from whoosh.fields import Schema, TEXT, ID
from whoosh.qparser import QueryParser

class SearchIndex:
    def __init__(self):
        self.schema = Schema(title=TEXT(stored=True), content=TEXT(stored=True), author=ID(stored=True))
        self.ix = index.create_in("index_dir", self.schema)
        self.writer = self.ix.writer()

    def index_post(self, post):
        self.writer.add_document(title=post.title, content=post.content, author=post.author)

def search_posts(self, query):
        with self.ix.searcher() as searcher:
            query_parser = QueryParser("content", self.ix.schema)
            parsed_query = query_parser.parse(query)
            search_results = searcher.search(parsed_query, limit=None)
            matching_posts = [dict(result) for result in search_results]
            return matching_posts

# Example usage
search_index = SearchIndex()
post1 = Post("Python Basics", "Learn the fundamentals of Python programming.", "john")
post2 = Post("Web Development", "Discover the world of web development.", "alice")
search_index.index_post(post1)
search_index.index_post(post2)
matching_posts = search_index.search_posts("Python")

class LanguageManager:
    def __init__(self):
        self.supported_languages = ["English", "Spanish", "French"]
        self.language_communities = {}

    def create_language_community(self, language):
        if language not in self.supported_languages:
            return None
        if language not in self.language_communities:
            self.language_communities[language] = Community(language)
        return self.language_communities[language]

# Example usage
language_manager = LanguageManager()
english_community = language_manager.create_language_community("English")
spanish_community = language_manager.create_language_community("Spanish")
french_community = language_manager.create_language_community("French")

class TranslationService:
    def __init__(self):
        self.translations = {}

    def translate_content(self, content, source_language, target_language):
        translation_key = f"{source_language}_{target_language}"
        if translation_key not in self.translations:
            # Implement translation logic using external translation service or library
            translated_content = translate(content, source_language, target_language)
            self.translations[translation_key] = translated_content
        return self.translations[translation_key]

# Example usage
translation_service = TranslationService()
translated_content = translation_service.translate_content("Hello", "English", "Spanish")

class Community:
    def __init__(self, name, language):
        self.name = name
        self.language = language
        self.posts = []

    def add_post(self, post):
        self.posts.append(post)

    def filter_posts_by_language(self, target_language):
        filtered_posts = [post for post in self.posts if post.language == target_language]
        return filtered_posts

# Example usage
english_community = Community("programming", "English")
english_community.add_post(post1)
english_community.add_post(post2)
filtered_posts = english_community.filter_posts_by_language("Spanish")

from flask import Flask, request, jsonify

app = Flask(__name__)

@app.route("/api/posts", methods=["GET"])
def get_posts():
    # Retrieve posts from the post_manager or search_index
    posts = post_manager.get_posts()
    return jsonify(posts)

@app.route("/api/posts", methods=["POST"])
def create_post():
    data = request.get_json()
    # Create a new post based on the data
    post = Post(data["title"], data["content"], data["author"])
    post_manager.add_post(post)
    return jsonify({"message": "Post created successfully"})

# Other API routes for different functionalities

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

# Example usage
# Make HTTP requests to the API endpoints to interact with the system

from flask_limiter import Limiter
from flask_limiter.util import get_remote_address
limiter = Limiter(app, key_func=get_remote_address)

@app.route("/api/posts", methods=["POST"])
@limiter.limit("10/minute")
def create_post():
    # Authentication and authorization logic
    # Check user credentials, permissions, and rate limiting
    data = request.get_json()
    # Create a new post based on the data
    post = Post(data["title"], data["content"], data["author"])
    post_manager.add_post(post)
    return jsonify({"message": "Post created successfully"})

# Other API routes for different functionalities

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

# Example usage
# Make HTTP requests to the API endpoints with proper authentication headers and rate limiting

import requests

class ExternalServiceClient:
    def __init__(self, api_key):
        self.api_key = api_key

    def send_data(self, data):
        headers = {"Authorization": f"Bearer {self.api_key}"}
        response = requests.post("https://external-service.com/api/data", json=data, headers=headers)
        if response.status_code == 200:
            return True
        else:
            return False

# Example usage
external_service_client = ExternalServiceClient("API_KEY")
data = {"message": "Data to be sent"}
success = external_service_client.send_data(data)

import redis

class CacheManager:
    def __init__(self):
        self.cache = redis.Redis(host="localhost", port=6379)

    def get_data(self, key):
        cached_data = self.cache.get(key)
        if cached_data is not None:
            return cached_data.decode("utf-8")
        else:
            # Fetch data from the source and store in cache
            data = fetch_data_from_source(key)
            self.cache.set(key, data)
            return data

# Example usage
cache_manager = CacheManager()
data = cache_manager.get_data("cache_key")

class CommunityAnalytics:
    def __init__(self, community):
        self.community = community
        self.activity_counts = {}

    def track_activity(self, activity_type):
        if activity_type in self.activity_counts:
            self.activity_counts[activity_type] += 1
        else:
            self.activity_counts[activity_type] = 1

    def get_activity_count(self, activity_type):
        if activity_type in self.activity_counts:
            return self.activity_counts[activity_type]
        else:
            return 0

# Example usage
community_analytics = CommunityAnalytics("programming")
community_analytics.track_activity("post")
community_analytics.track_activity("comment")
post_count = community_analytics.get_activity_count("post")
comment_count = community_analytics.get_activity_count("comment")

class ReportingSystem:
    def __init__(self):
        self.reports = []

    def create_report(self, report_data):
        report = Report(report_data)
        self.reports.append(report)

    def get_reports(self):
        return self.reports

# Example usage
reporting_system = ReportingSystem()
reporting_system.create_report({"content": "Inappropriate post", "user": "john"})
reporting_system.create_report({"content": "Spam comments", "user": "alice"})
reports = reporting_system.get_reports()

# caller_identification.py

# Function to identify the caller's name based on the phone number
def identify_name(phone_number):
    # Perform logic to identify the caller's name based on the phone number
    # Example code:
    if phone_number == "+1234567890":
        return "John Doe"
    else:
        return "Unknown"

# Function to identify the caller's location based on the phone number
def identify_location(phone_number):
    # Perform logic to identify the caller's location based on the phone number
    # Example code:
    if phone_number == "+1234567890":
        return "New York"
    else:
        return "Unknown"

# Function to check if the call is a spam call
def check_spam(phone_number):
    # Perform logic to check if the call is a spam call
    # Example code:
    if phone_number in spam_number_list:
        return True
    else:
        return False

# contact_management.py

contacts = [
    {"name": "John Doe", "phone_number": "+1234567890"},
    {"name": "Jane Smith", "phone_number": "+9876543210"}
]

# Function to retrieve user contacts
def get_contacts():
    # Perform logic to retrieve and return user contacts
    # Example code:
    return contacts

# Function to add a new contact
def add_contact(name, phone_number):
    # Perform logic to add a new contact
    # Example code:
    new_contact = {"name": name, "phone_number": phone_number}
    contacts.append(new_contact)

# Function to update an existing contact
def update_contact(name, new_phone_number):
    # Perform logic to update an existing contact
    # Example code:
    for contact in contacts:
        if contact["name"] == name:
            contact["phone_number"] = new_phone_number
            break

# Function to delete a contact
def delete_contact(name):
    # Perform logic to delete a contact
    # Example code:
    for contact in contacts:
        if contact["name"] == name:
            contacts.remove(contact)
            break

# spam_blocking.py

spam_number_list = ["+9999999999", "+1111111111"]  # Example list of spam numbers

def is_spam(phone_number):
    return phone_number in spam_number_list

def block_spam(phone_number):
    spam_number_list.append(phone_number)

# flash_messaging.py

def send_flash_message(contact, message):
    print(f"Sending flash message to {contact['name']}: {message}")

# Code for Caller Identification Service

class CallerIdentificationService:
    def identify_caller(self, caller_phone):
        # Query the database or external APIs to fetch caller information
        caller_info = self.get_caller_info(caller_phone)

        # Return the identified caller information
        return caller_info

    def get_caller_info(self, caller_phone):
        # Simulated implementation - returns hardcoded caller information
        return {
            'name': 'John Doe',
            'profile_picture': 'https://example.com/profiles/johndoe.jpg',
            'location': 'New York'
        }

# Usage
caller_phone = '1234567890'
identification_service = CallerIdentificationService()
caller_info = identification_service.identify_caller(caller_phone)
print(caller_info)

import java.util.*;

class User {
    private String userId;
    private String name;
    private String phoneNumber;
    private List<Contact> contacts;
    private List<Call> callHistory;
    private List<String> blockedNumbers;

    public User(String userId, String name, String phoneNumber) {
        this.userId = userId;
        this.name = name;
        this.phoneNumber = phoneNumber;
        this.contacts = new ArrayList<>();
        this.callHistory = new ArrayList<>();
        this.blockedNumbers = new ArrayList<>();
    }

    // Getters and setters for attributes
    // ...
}

class Contact {
    private String contactId;
    private User user;
    private String name;
    private String phoneNumber;

    public Contact(String contactId, User user, String name, String phoneNumber) {
        this.contactId = contactId;
        this.user = user;
        this.name = name;
        this.phoneNumber = phoneNumber;
    }

    // Getters and setters for attributes
    // ...
}

class Call {
    private String callId;
    private User caller;
    private User receiver;
    private int duration;
    private Date timestamp;

    public Call(String callId, User caller, User receiver, int duration, Date timestamp) {
        this.callId = callId;
        this.caller = caller;
        this.receiver = receiver;
        this.duration = duration;
        this.timestamp = timestamp;
    }

    // Getters and setters for attributes
    // ...
}

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

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

    public void addUser(User user) {
        users.put(user.getUserId(), user);
    }

    public User getUserById(String userId) {
        return users.get(userId);
    }

    // Additional methods for contact management, call logging, caller identification, call blocking, etc.
    // ...
}

public class Main {
    public static void main(String[] args) {
        Truecaller truecaller = new Truecaller();

        User user1 = new User("1", "Alice", "1234567890");
        User user2 = new User("2", "Bob", "9876543210");

        truecaller.addUser(user1);
        truecaller.addUser(user2);

        // Additional logic to interact with the Truecaller system
        // ...
    }
}

{
  "phone_number": "1234567890"
}

{
  "caller_name": "John Doe",
  "caller_location": "New York",
  "spam_call": false
}

{
  "phone_number": "1234567890"
}

{
  "success": true
}

{
  "contacts": [
    {
      "name": "John Doe",
      "phone_number": "1234567890"
    },
    {
      "name": "Jane Smith",
      "phone_number": "9876543210"
    }
  ]
}

from flask import Flask, request, jsonify

app = Flask(__name__)

@app.route('/api/identify_caller', methods=['POST'])
def identify_caller():
    phone_number = request.json['phone_number']
    # Perform caller identification logic
    caller_name = identify_name(phone_number)
    caller_location = identify_location(phone_number)
    spam_call = check_spam(phone_number)
    
    response = {
        "caller_name": caller_name,
        "caller_location": caller_location,
        "spam_call": spam_call
    }
    return jsonify(response)

def identify_name(phone_number):
    # Perform logic to identify caller name based on the phone number
    # Example code:
    return "John Doe"

def identify_location(phone_number):
    # Perform logic to identify caller location based on the phone number
    # Example code:
    return "New York"

def check_spam(phone_number):
    # Perform logic to check if the phone number is a spam call
    # Example code:
    return False

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

@app.route('/api/block_spam_call', methods=['POST'])
def block_spam_call():
    phone_number = request.json['phone_number']
    # Perform spam blocking logic
    # Example code:
    block_spam(phone_number)
    
    response = {
        "success": True
    }
    return jsonify(response)

def block_spam(phone_number):
    # Perform logic to block spam calls based on the phone number
    # Example code:
    # Add phone number to a spam number database or block list
    pass

@app.route('/api/manage_contacts', methods=['GET'])
def manage_contacts():
    # Perform contact management logic
    # Example code:
    contacts = get_contacts()
    
    response = {
        "contacts": contacts
    }
    return jsonify(response)

def get_contacts():
    # Perform logic to retrieve and return user contacts
    # Example code:
    return [
        {"name": "John Doe", "phone_number": "1234567890"},
        {"name": "Jane Smith", "phone_number": "9876543210"}
    ]

import flask
from flask import request

app = flask.Flask(__name__)

users = {
    "user1": {
        "name": "Alice",
        "phone_number": "1234567890",
        "contacts": [],
        "call_history": [],
        "blocked_numbers": []
    },
    "user2": {
        "name": "Bob",
        "phone_number": "9876543210",
        "contacts": [],
        "call_history": [],
        "blocked_numbers": []
    }
}

# Endpoint for creating a new user
@app.route("/users", methods=["POST"])
def create_user():
    data = request.get_json()
    user_id = "user" + str(len(users) + 1)
    user = {
        "name": data["name"],
        "phone_number": data["phone_number"],
        "contacts": [],
        "call_history": [],
        "blocked_numbers": []
    }
    users[user_id] = user
    return {"message": "User created successfully"}, 201

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

# Endpoint for adding a contact
@app.route("/users/<user_id>/contacts", methods=["POST"])
def add_contact(user_id):
    if user_id in users:
        data = request.get_json()
        contact_id = "contact" + str(len(users[user_id]["contacts"]) + 1)
        contact = {
            "name": data["name"],
            "phone_number": data["phone_number"]
        }
        users[user_id]["contacts"].append(contact)
        return "Contact added successfully", 200
    else:
        return "User not found", 404

# Endpoint for making a call
@app.route("/users/<caller_id>/calls/<receiver_id>", methods=["POST"])
def make_call(caller_id, receiver_id):
    if caller_id in users and receiver_id in users:
        data = request.get_json()
        call_id = "call" + str(len(users[caller_id]["call_history"]) + 1)
        call = {
            "duration": data["duration"],
            "timestamp": data["timestamp"]
        }
        users[caller_id]["call_history"].append(call)
        return "Call made successfully", 200
    else:
        return "User not found", 404

# Endpoint for blocking a number
@app.route("/users/<user_id>/block/<phone_number>", methods=["POST"])
def block_number(user_id, phone_number):
    if user_id in users:
        users[user_id]["blocked_numbers"].append(phone_number)
        return "Number blocked successfully", 200
    else:
        return "User not found", 404

# Endpoint for unblocking a number
@app.route("/users/<user_id>/unblock/<phone_number>", methods=["POST"])
def unblock_number(user_id, phone_number):
    if user_id in users:
        if phone_number in users[user_id]["blocked_numbers"]:
            users[user_id]["blocked_numbers"].remove(phone_number)
            return "Number unblocked successfully", 200
        else:
            return "Number not blocked", 404
    else:
        return "User not found", 404

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

# truecaller.py

# Import required modules and libraries
import requests
from flask import Flask, request, jsonify

app = Flask(__name__)

# Truecaller API endpoints
@app.route('/api/identify_caller', methods=['POST'])
def identify_caller():
    phone_number = request.json['phone_number']
    
    # Make a request to the caller identification service
    response = requests.get(f'https://truecaller.com/identify_caller/{phone_number}')
    
    # Process the response and extract caller information
    caller_info = process_response(response)
    
    return jsonify(caller_info)

@app.route('/api/block_spam_call', methods=['POST'])
def block_spam_call():
    phone_number = request.json['phone_number']
    
    # Make a request to the spam blocking service
    response = requests.post(f'https://truecaller.com/block_spam_call/{phone_number}')
    
    # Process the response and extract blocking status
    status = process_response(response)
    
    return jsonify(status)

@app.route('/api/record_call', methods=['POST'])
def record_call():
    call_id = request.json['call_id']
    
    # Make a request to the call recording service
    response = requests.post(f'https://truecaller.com/record_call/{call_id}')
    
    # Process the response and extract recording status
    status = process_response(response)
    
    return jsonify(status)

@app.route('/api/manage_contacts', methods=['GET'])
def manage_contacts():
    # Make a request to the contact management service
    response = requests.get('https://truecaller.com/manage_contacts')
    
    # Process the response and extract contact information
    contacts = process_response(response)
    
    return jsonify(contacts)

@app.route('/api/send_flash_message', methods=['POST'])
def send_flash_message():
    contact = request.json['contact']
    message = request.json['message']
    
    # Make a request to the flash messaging service
    response = requests.post(f'https://truecaller.com/send_flash_message/{contact}', data={'message': message})
    
    # Process the response and extract sending status
    status = process_response(response)
    
    return jsonify(status)

# Helper function to process API responses
def process_response(response):
    if response.status_code == 200:
        return response.json()
    else:
        return {'error': 'An error occurred'}

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

import time

class StripeSimulator:
    def __init__(self):
        # Simulated data
        self.total_customers = 100000000
        self.daily_active_customers = 20000000
        self.transactions_per_customer_per_day = 2

    def process_payment(self, customer_id, amount):
        # Simulating payment processing logic
        time.sleep(0.01)  # Simulate processing time
        return f"Payment of {amount} USD processed for customer {customer_id}."

    def get_transaction_history(self, customer_id):
        # Simulating reading transaction history
        time.sleep(0.001)  # Simulate read time
        return f"Transaction history for customer {customer_id}."

if __name__ == "__main__":
    stripe_sim = StripeSimulator()

    # Simulate payment processing for active customers
    for i in range(stripe_sim.daily_active_customers):
        customer_id = f"customer_{i}"
        for j in range(stripe_sim.transactions_per_customer_per_day):
            amount = (j + 1) * 10
            response = stripe_sim.process_payment(customer_id, amount)
            print(response)

    # Simulate reading transaction history for active customers
    for i in range(stripe_sim.daily_active_customers):
        customer_id = f"customer_{i}"
        response = stripe_sim.get_transaction_history(customer_id)
        print(response)

Customer

customer_id: Int (Primary Key)
name: String
email: String
payment_method: String (e.g., credit card, digital wallet)
billing_address: String

Payment

payment_id: Int (Primary Key)
customer_id: Int (Foreign Key referencing Customer)
amount: Decimal
currency: String
payment_status: String (e.g., 'created', 'processing', 'succeeded', 'failed')
timestamp: DateTime

Subscription

subscription_id: Int (Primary Key)
customer_id: Int (Foreign Key referencing Customer)
plan_id: Int
status: String (e.g., 'active', 'canceled', 'paused')
start_date: Date
end_date: Date

Plan

plan_id: Int (Primary Key)
name: String
amount: Decimal
currency: String
description: String

import uuid
from datetime import datetime

# Sample data store (simplified)
customers = {}
payments = {}
subscriptions = {}
plans = {}

# Service functions

# Customer Service
def create_customer(name, email, billing_address):
    customer_id = str(uuid.uuid4())
    customers[customer_id] = {
        'name': name,
        'email': email,
        'billing_address': billing_address
    }
    return customer_id

def get_customer(customer_id):
    return customers.get(customer_id)

# Plan Service
def create_plan(name, amount, currency, description):
    plan_id = str(uuid.uuid4())
    plans[plan_id] = {
        'name': name,
        'amount': amount,
        'currency': currency,
        'description': description
    }
    return plan_id

def get_plan(plan_id):
    return plans.get(plan_id)

# Payment Service
def process_payment(customer_id, amount, currency, payment_method):
    payment_id = str(uuid.uuid4())
    payments[payment_id] = {
        'customer_id': customer_id,
        'amount': amount,
        'currency': currency,
        'payment_method': payment_method,
        'status': 'created',
        'timestamp': datetime.now().isoformat()
    }
    return payment_id

def get_payment(payment_id):
    return payments.get(payment_id)

# Subscription Service
def create_subscription(customer_id, plan_id, start_date, end_date):
    subscription_id = str(uuid.uuid4())
    subscriptions[subscription_id] = {
        'customer_id': customer_id,
        'plan_id': plan_id,
        'status': 'active',
        'start_date': start_date,
        'end_date': end_date
    }
    return subscription_id

def get_subscription(subscription_id):
    return subscriptions.get(subscription_id)

# Sample usage
if __name__ == '__main__':
    # Create a customer
    customer_id = create_customer('John Doe', '[email protected]', '123 Main St, City')

    # Create a plan
    plan_id = create_plan('Basic Plan', 9.99, 'USD', 'Access to basic features')

    # Process a payment
    payment_id = process_payment(customer_id, 9.99, 'USD', 'Credit Card')

    # Create a subscription
    subscription_id = create_subscription(customer_id, plan_id, '2023-07-19', '2024-07-19')

    # Get customer, plan, payment, and subscription details
    customer_details = get_customer(customer_id)
    plan_details = get_plan(plan_id)
    payment_details = get_payment(payment_id)
    subscription_details = get_subscription(subscription_id)

    # Print the details
    print("Customer Details:", customer_details)
    print("Plan Details:", plan_details)
    print("Payment Details:", payment_details)
    print("Subscription Details:", subscription_details)

User:

Attributes: userId, username, email, password, etc.
Functionality: Creation of user accounts, login, update user information, etc.

Payment Method:

Attributes: paymentMethodId, cardNumber, expirationDate, CVV, etc.
Functionality: Adding, updating, and retrieving payment methods for a user.

Payment:

Attributes: paymentId, userId, amount, currency, timestamp, etc.
Functionality: Processing payments, retrieving payment history, etc.

Subscription:

Attributes: subscriptionId, userId, planId, startDate, endDate, etc.
Functionality: Creating and managing user subscriptions.

Plan:

Attributes: planId, name, amount, currency, description, etc.
Functionality: Creating and retrieving available plans.

from flask import Flask, request, jsonify
import uuid

app = Flask(__name__)

# Simulated in-memory data store for payments and subscriptions
payments = {}
subscriptions = {}

def create_payment_intent(amount, currency):
    payment_id = str(uuid.uuid4())
    payments[payment_id] = {
        'amount': amount,
        'currency': currency,
        'status': 'created'
    }
    return payment_id

def process_payment(payment_id, payment_details):
    if payment_id not in payments:
        raise Exception("Invalid Payment ID")
    
    if payments[payment_id]['status'] != 'created':
        raise Exception("Payment is already processed")
    
    # Simulate payment processing here (e.g., using Stripe's actual API)
    payments[payment_id]['status'] = 'processed'
    return "Payment processed successfully."

def get_payment_status(payment_id):
    if payment_id not in payments:
        raise Exception("Invalid Payment ID")
    return payments[payment_id]['status']

def create_subscription(customer_id, plan_id):
    subscription_id = str(uuid.uuid4())
    subscriptions[subscription_id] = {
        'customer_id': customer_id,
        'plan_id': plan_id,
        'status': 'active'
    }
    return subscription_id

def webhook_endpoint(event_type, data):
    # Process incoming webhook events here
    print(f"Received webhook event: {event_type}, data: {data}")

# High-Level API Endpoints

@app.route('/api/payments', methods=['POST'])
def create_and_process_payment():
    data = request.json
    amount = data.get('amount')
    currency = data.get('currency')
    payment_id = create_payment_intent(amount, currency)
    
    # Simulate payment processing
    payment_details = {
        "number": "4242 4242 4242 4242",
        "exp_month": 12,
        "exp_year": 2025,
        "cvc": "123"
    }
    process_payment(payment_id, payment_details)
    
    return jsonify({"payment_id": payment_id, "status": "processed"}), 200

@app.route('/api/payments/<payment_id>', methods=['GET'])
def get_payment_status_endpoint(payment_id):
    status = get_payment_status(payment_id)
    return jsonify({"status": status}), 200

@app.route('/api/subscriptions', methods=['POST'])
def create_subscription_endpoint():
    data = request.json
    customer_id = data.get('customer_id')
    plan_id = data.get('plan_id')
    subscription_id = create_subscription(customer_id, plan_id)
    return jsonify({"subscription_id": subscription_id, "status": "active"}), 201

@app.route('/api/webhooks', methods=['POST'])
def handle_webhook():
    data = request.json
    event_type = data.get('event_type')
    webhook_data = data.get('data')
    webhook_endpoint(event_type, webhook_data)
    return jsonify({"message": "Webhook event processed."}), 200

if __name__ == '__main__':
    app.run(port=8000)

User Management API:

/users (POST): Create a new user account.
/users/{userId} (GET): Retrieve user information by userId.
/users/{userId} (PATCH): Update user information (e.g., name, email, password).
Payment Method API:

/users/{userId}/payment-methods (POST): Add a new payment method for a user.
/users/{userId}/payment-methods/{paymentMethodId} (PATCH): Update a user's payment method information.
/users/{userId}/payment-methods (GET): Retrieve all payment methods for a user.

Payment API:

/payments (POST): Process a payment with the specified payment method for a user.
/users/{userId}/payments (GET): Retrieve payment history for a user.

Subscription API:

/subscriptions (POST): Create a new subscription for a user with a specific plan.
/subscriptions/{subscriptionId} (GET): Retrieve subscription details by subscriptionId.
/users/{userId}/subscriptions (GET): Retrieve all active subscriptions for a user.

Plan API:

/plans (POST): Create a new plan with a specific name, amount, currency, and description.
/plans/{planId} (GET): Retrieve plan details by planId.
/plans (GET): Retrieve all available plans.

import uuid

# Simulated in-memory data store for payments and subscriptions
payments = {}
subscriptions = {}

def create_payment_intent(amount, currency):
    payment_id = str(uuid.uuid4())
    payments[payment_id] = {
        'amount': amount,
        'currency': currency,
        'status': 'created'
    }
    return payment_id

def process_payment(payment_id, payment_details):
    if payment_id not in payments:
        raise Exception("Invalid Payment ID")
    
    if payments[payment_id]['status'] != 'created':
        raise Exception("Payment is already processed")
    
    # Simulate payment processing here (e.g., using Stripe's actual API)
    payments[payment_id]['status'] = 'processed'
    return "Payment processed successfully."

def get_payment_status(payment_id):
    if payment_id not in payments:
        raise Exception("Invalid Payment ID")
    return payments[payment_id]['status']

def create_subscription(customer_id, plan_id):
    subscription_id = str(uuid.uuid4())
    subscriptions[subscription_id] = {
        'customer_id': customer_id,
        'plan_id': plan_id,
        'status': 'active'
    }
    return subscription_id

def webhook_endpoint(event_type, data):
    # Process incoming webhook events here
    print(f"Received webhook event: {event_type}, data: {data}")

# Simple HTTP server to handle API requests

from flask import Flask, request, jsonify

app = Flask(__name__)

@app.route('/api/payments/create', methods=['POST'])
def create_payment():
    data = request.json
    amount = data.get('amount')
    currency = data.get('currency')
    payment_id = create_payment_intent(amount, currency)
    return jsonify({"payment_id": payment_id}), 201

@app.route('/api/payments/process', methods=['POST'])
def process_payment_endpoint():
    data = request.json
    payment_id = data.get('payment_id')
    payment_details = data.get('payment_details')
    response = process_payment(payment_id, payment_details)
    return jsonify({"message": response}), 200

@app.route('/api/payments/status/<payment_id>', methods=['GET'])
def get_payment_status_endpoint(payment_id):
    status = get_payment_status(payment_id)
    return jsonify({"status": status}), 200

@app.route('/api/subscriptions/create', methods=['POST'])
def create_subscription_endpoint():
    data = request.json
    customer_id = data.get('customer_id')
    plan_id = data.get('plan_id')
    subscription_id = create_subscription(customer_id, plan_id)
    return jsonify({"subscription_id": subscription_id}), 201

@app.route('/api/webhooks', methods=['POST'])
def handle_webhook():
    data = request.json
    event_type = data.get('event_type')
    webhook_data = data.get('data')
    webhook_endpoint(event_type, webhook_data)
    return jsonify({"message": "Webhook event processed."}), 200

if __name__ == '__main__':
    app.run(port=8000)

class User:
    def __init__(self, user_id, email, password, credit_card=None, bank_account=None):
        self.user_id = user_id
        self.email = email
        self.password = password
        self.credit_card = credit_card
        self.bank_account = bank_account

    # Other methods and attributes for user management


class CreditCard:
    def __init__(self, card_number, expiration_date, cvv):
        self.card_number = card_number
        self.expiration_date = expiration_date
        self.cvv = cvv

    # Other methods and attributes for credit card management


class BankAccount:
    def __init__(self, account_number, routing_number):
        self.account_number = account_number
        self.routing_number = routing_number

    # Other methods and attributes for bank account management


class Payment:
    def __init__(self, payment_id, user_id, amount, payment_method):
        self.payment_id = payment_id
        self.user_id = user_id
        self.amount = amount
        self.payment_method = payment_method

    # Other methods and attributes for payment management


class PaymentMethod:
    CREDIT_CARD = "Credit Card"
    BANK_ACCOUNT = "Bank Account"


class StripeSystem:
    def __init__(self):
        self.users = {}
        self.payments = {}

    def create_user(self, user_id, email, password, payment_method, payment_info):
        if user_id in self.users:
            return "User already exists."

        if payment_method == PaymentMethod.CREDIT_CARD:
            payment_info = CreditCard(payment_info['card_number'], payment_info['expiration_date'], payment_info['cvv'])
        elif payment_method == PaymentMethod.BANK_ACCOUNT:
            payment_info = BankAccount(payment_info['account_number'], payment_info['routing_number'])
        else:
            return "Invalid payment method."

        user = User(user_id, email, password, payment_info)
        self.users[user_id] = user
        return "User created successfully."

    def make_payment(self, user_id, amount):
        if user_id not in self.users:
            return "User not found."

        user = self.users[user_id]
        payment_id = len(self.payments) + 1
        payment = Payment(payment_id, user_id, amount, user.payment_info)
        self.payments[payment_id] = payment
        return "Payment successful."

    # Other methods and functionalities for the Stripe system


# Example usage:
stripe_system = StripeSystem()

# Create a user with a credit card payment method
stripe_system.create_user("user1", "[email protected]", "password123", PaymentMethod.CREDIT_CARD,
                          {"card_number": "1234567890123456", "expiration_date": "12/25", "cvv": "123"})

# Create a user with a bank account payment method
stripe_system.create_user("user2", "[email protected]", "password456", PaymentMethod.BANK_ACCOUNT,
                          {"account_number": "9876543210", "routing_number": "123456789"})

# Make a payment for user1
stripe_system.make_payment("user1", 100)

# Make a payment for user2
stripe_system.make_payment("user2", 50)

# a. Payment Processing

class PaymentProcessor:
    def __init__(self, api_key):
        self.api_key = api_key
        self.gateway_url = "https://api.stripe.com/v1/payments"

    def process_payment(self, amount, currency, payment_method):
        headers = {"Authorization": f"Bearer {self.api_key}"}
        payload = {
            "amount": amount,
            "currency": currency,
            "source": payment_method
        }

        response = requests.post(self.gateway_url, data=payload, headers=headers)
        if response.status_code == 200:
            return response.json()
        else:
            raise Exception("Payment processing failed.")


# b. Subscriptions and Recurring Billing

class SubscriptionManager:
    def __init__(self, api_key):
        self.api_key = api_key
        self.subscription_url = "https://api.stripe.com/v1/subscriptions"

    def create_subscription(self, customer_id, plan_id):
        headers = {"Authorization": f"Bearer {self.api_key}"}
        payload = {
            "customer": customer_id,
            "items": [{"plan": plan_id}]
        }

        response = requests.post(self.subscription_url, data=payload, headers=headers)
        if response.status_code == 200:
            return response.json()
        else:
            raise Exception("Subscription creation failed.")


# c. Fraud Prevention

class FraudPrevention:
    def __init__(self, api_key):
        self.api_key = api_key
        self.fraud_check_url = "https://api.stripe.com/v1/radar/value_list_items"

    def check_fraud(self, card_number):
        headers = {"Authorization": f"Bearer {self.api_key}"}
        payload = {
            "value": card_number,
            "value_list": "fraud_list"
        }

        response = requests.post(self.fraud_check_url, data=payload, headers=headers)
        if response.status_code == 200:
            return response.json()
        else:
            raise Exception("Fraud check failed.")


# d. Payouts and Transfers

class PayoutManager:
    def __init__(self, api_key):
        self.api_key = api_key
        self.payout_url = "https://api.stripe.com/v1/payouts"

    def initiate_payout(self, amount, currency, recipient_id):
        headers = {"Authorization": f"Bearer {self.api_key}"}
        payload = {
            "amount": amount,
            "currency": currency,
            "destination": recipient_id
        }

        response = requests.post(self.payout_url, data=payload, headers=headers)
        if response.status_code == 200:
            return response.json()
        else:
            raise Exception("Payout initiation failed.")

class CanvaSimulation:
    def __init__(self):
        self.total_users = 100_000_000
        self.daily_active_users = 20_000_000
        self.designs_per_user_per_day = 2
        self.total_designs_per_day = self.daily_active_users * self.designs_per_user_per_day
        self.read_to_write_ratio = 100
        self.total_designs_uploaded_per_day = self.total_designs_per_day // self.read_to_write_ratio
        self.design_size_mb = 5
        self.total_storage_per_day_gb = self.total_designs_uploaded_per_day * self.design_size_mb
        self.total_storage_next_3_years_pb = self.total_storage_per_day_gb * 365 * 3
        self.requests_per_second = self.total_designs_per_day // (3600 * 24)

    def print_simulation_results(self):
        print("Simulation Results for Canva:")
        print(f"Total number of users: {self.total_users}")
        print(f"Daily active users (DAU): {self.daily_active_users}")
        print(f"Number of designs created by user/day: {self.designs_per_user_per_day}")
        print(f"Total number of designs created per day: {self.total_designs_per_day}")
        print(f"Read-to-write ratio: {self.read_to_write_ratio}")
        print(f"Total number of designs uploaded per day: {self.total_designs_uploaded_per_day}")
        print(f"Design size: {self.design_size_mb} MB")
        print(f"Total storage per day: {self.total_storage_per_day_gb} GB/day")
        print(f"Total storage for the next 3 years: {self.total_storage_next_3_years_pb} PB")
        print(f"Requests per second: {self.requests_per_second} requests/second")

if __name__ == "__main__":
    canva_simulation = CanvaSimulation()
    canva_simulation.print_simulation_results()

User:

Username: String
Email: String
Password: String

Design:

DesignID: Integer
UserID: Integer (Foreign key from User table)
ImageURL: String
Caption: String
Timestamp: DateTime
Location: String

User Class:

Attributes:
user_id: Unique identifier for the user.
username: Username of the user.
email: Email address of the user.
password: Password of the user.
Other user attributes (e.g., profile picture, bio, etc.).

Design Class:

Attributes:
design_id: Unique identifier for the design.
user: User object representing the creator of the design (Foreign key from User class).
image_url: URL of the design image.
caption: Caption or description of the design.
timestamp: Timestamp of when the design was created.

Canva Class:

Attributes:
users: A map (dictionary) to store user objects with user_id as the key.
designs: A list to store design objects.
Methods:
add_user(user): Adds a new user to the users map.
get_user_by_id(user_id): Retrieves a user object by their user_id.
create_design(user_id, image_url, caption): Creates a new design and adds it to the designs list.
get_user_feed(user_id): Retrieves the feed of designs for a user based on the designs created by users they follow.

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

app = Flask(__name__)

# Sample in-memory data stores (replace these with your actual database)
users = {}
designs = {}

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

    def to_dict(self):
        return {
            "user_id": self.user_id,
            "username": self.username
        }

class Design:
    def __init__(self, design_id, user_id, image_url, caption):
        self.design_id = design_id
        self.user_id = user_id
        self.image_url = image_url
        self.caption = caption
        self.timestamp = datetime.datetime.now()

    def to_dict(self):
        return {
            "design_id": self.design_id,
            "user_id": self.user_id,
            "image_url": self.image_url,
            "caption": self.caption,
            "timestamp": self.timestamp.isoformat()
        }

@app.route('/users', methods=['POST'])
def create_user():
    data = request.get_json()
    user_id = str(uuid.uuid4())
    user = User(user_id, data["username"], data["password"])
    users[user_id] = user.to_dict()
    return jsonify(user.to_dict()), 201

@app.route('/users/<string: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('/designs', methods=['POST'])
def create_design():
    data = request.get_json()
    user_id = data["user_id"]
    if user_id not in users:
        return jsonify({"message": "User not found"}), 404

    design_id = str(uuid.uuid4())
    design = Design(design_id, user_id, data["image_url"], data["caption"])
    designs[design_id] = design.to_dict()
    users[user_id]["designs"].append(design_id)
    return jsonify(design.to_dict()), 201

@app.route('/designs/<string:design_id>', methods=['GET'])
def get_design(design_id):
    if design_id in designs:
        return jsonify(designs[design_id]), 200
    else:
        return jsonify({"message": "Design not found"}), 404

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

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

User Management API:

Endpoint: /users
Methods: POST, GET, PATCH, DELETE
Description: This API allows users to create an account, retrieve user information, update their profile, and delete their account.

Design Management API:

Endpoint: /designs
Methods: POST, GET, DELETE
Description: This API allows users to upload a new design, retrieve a specific design, and delete their own designs.

Feed API:

Endpoint: /users/{user_id}/feed
Method: GET
Description: This API allows users to retrieve their personalized feed of designs from users they follow.

from flask import Flask, request, jsonify

app = Flask(__name__)

# Sample in-memory data store (replace this with your actual database)
designs = {}

# Generate a unique design ID
def generate_design_id():
    # You can implement a more robust method for generating unique IDs in a real-world scenario
    return str(len(designs) + 1)

# Endpoint: Create Design
@app.route('/api/designs', methods=['POST'])
def create_design():
    data = request.json
    design_id = generate_design_id()
    designs[design_id] = {
        'design_id': design_id,
        'user_id': data['user_id'],
        'title': data['title'],
        'content': data['content'],
        # Other design properties as needed
    }
    return jsonify({'design_id': design_id}), 201

# Endpoint: Fetch Design
@app.route('/api/designs/<string:design_id>', methods=['GET'])
def get_design(design_id):
    if design_id in designs:
        return jsonify(designs[design_id])
    else:
        return jsonify({'message': 'Design not found'}), 404

# Endpoint: Fetch All Designs
@app.route('/api/designs', methods=['GET'])
def get_all_designs():
    return jsonify(list(designs.values()))

# Endpoint: Delete Design
@app.route('/api/designs/<string:design_id>', methods=['DELETE'])
def delete_design(design_id):
    if design_id in designs:
        del designs[design_id]
        return jsonify({'message': 'Design deleted successfully'}), 200
    else:
        return jsonify({'message': 'Design not found'}), 404

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

class Canva:
    def __init__(self):
        self.interface = "Intuitive and easy-to-navigate"
        self.templates = ["Social Media", "Presentation", "Flyers", "Posters", "Infographics"]
        self.tools = ["Drag-and-drop functionality", "Image filters", "Text editing", "Shapes and Elements"]
        self.collaboration = "real-time collaboration"
        self.integration = "seamless importing and exporting of content"

    def show_interface(self):
        return f"Canva boasts an {self.interface} interface, making it accessible to users of all skill levels."

    def show_templates(self):
        return f"The platform offers an extensive collection of professionally designed templates for various purposes: {', '.join(self.templates)}."

    def show_design_tools(self):
        return f"Canva provides a range of editing tools, including {', '.join(self.tools)} and more."

    def show_collaboration(self):
        return f"Users can collaborate in {self.collaboration}, allowing teams to work together on design projects efficiently."

    def show_integration(self):
        return f"Canva integrates with other platforms and applications, enabling {self.integration}."

if __name__ == "__main__":
    canva = Canva()

    print(canva.show_interface())
    print(canva.show_templates())
    print(canva.show_design_tools())
    print(canva.show_collaboration())
    print(canva.show_integration())

import time

class GrammarlySimulation:
    def __init__(self):
        # Initial storage usage in TB
        self.storage_usage = 0

    def simulate_document_check(self):
        # Simulate document check by a user
        time.sleep(1)  # Simulating the time taken for document processing
        return True

    def simulate_document_upload(self):
        # Simulate document upload by a user
        # Assuming an average document size of 100 KB
        document_size_kb = 100
        documents_uploaded = 0
        while documents_uploaded < 100000:
            self.storage_usage += document_size_kb / 1024 / 1024  # Convert KB to TB
            documents_uploaded += 1
            time.sleep(0.01)  # Simulating the time taken for document upload

    def run_simulation(self):
        # Simulate document checks by active users
        print("Simulating document checks by active users...")
        active_users = 2000000
        for i in range(active_users):
            self.simulate_document_check()
        print("Document checks simulation completed.")

        # Simulate document uploads
        print("Simulating document uploads...")
        self.simulate_document_upload()
        print("Document uploads simulation completed.")

        # Display storage usage
        print(f"Total storage usage: {self.storage_usage:.2f} TB")

if __name__ == "__main__":
    simulation = GrammarlySimulation()
    simulation.run_simulation()

Users:

Username: String
Email: String
Password: String
Documents:

DocumentID: Int
UserID: Int (Foreign key from Users table)
Content: Text
Timestamp: DateTime
Suggestions:

SuggestionID: Int
DocumentID: Int (Foreign key from Documents table)
Type: String (e.g., Grammar, Style)
Message: Text
Timestamp: DateTime

class UserService:
    def __init__(self):
        self.users = {}
        self.next_user_id = 1

    def signup(self, username, email, password):
        user_id = self.next_user_id
        self.users[user_id] = {'username': username, 'email': email, 'password': password}
        self.next_user_id += 1
        return user_id

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

# Usage Example:
user_service = UserService()
user_id = user_service.signup('user1', '[email protected]', 'password123')
print(f"User ID: {user_id}")
authenticated_user_id = user_service.login('user1', 'password123')
print(f"Authenticated User ID: {authenticated_user_id}")

class DocumentService:
    def __init__(self):
        self.documents = {}
        self.next_document_id = 1

    def upload_document(self, user_id, content):
        document_id = self.next_document_id
        self.documents[document_id] = {'user_id': user_id, 'content': content}
        self.next_document_id += 1
        return document_id

    def get_document(self, document_id):
        return self.documents.get(document_id)

# Usage Example:
document_service = DocumentService()
user_id = 1  # Assume this is the authenticated user ID
document_content = "This is the content of the document."
document_id = document_service.upload_document(user_id, document_content)
print(f"Document ID: {document_id}")
document = document_service.get_document(document_id)
print(f"Document Content: {document['content']}")

class SuggestionService:
    def generate_suggestions(self, document_content):
        # Implementation logic for generating suggestions based on the document content
        # For demonstration, let's assume some suggestions
        suggestions = ["Consider rephrasing this sentence.", "Check for grammar errors in paragraph 3."]
        return suggestions

# Usage Example:
suggestion_service = SuggestionService()
document_content = "This is a sample document for testing."
suggestions = suggestion_service.generate_suggestions(document_content)
print("Suggestions:")
for idx, suggestion in enumerate(suggestions, 1):
    print(f"{idx}. {suggestion}")

class FeedbackService:
    def submit_feedback(self, user_id, suggestion_id, feedback):
        # Implementation logic for submitting feedback for a suggestion
        # For demonstration, let's assume the feedback is stored in a dictionary
        feedback_data = {'user_id': user_id, 'suggestion_id': suggestion_id, 'feedback': feedback}
        return feedback_data

# Usage Example:
feedback_service = FeedbackService()
user_id = 1  # Assume this is the authenticated user ID
suggestion_id = 123  # Assume this is the ID of the suggestion the user wants to provide feedback on
feedback_text = "This is great advice! It helped me improve my writing."
feedback = feedback_service.submit_feedback(user_id, suggestion_id, feedback_text)
print("Feedback Submitted:")
print(f"User ID: {feedback['user_id']}")
print(f"Suggestion ID: {feedback['suggestion_id']}")
print(f"Feedback: {feedback['feedback']}")

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

class Document:
    def __init__(self, document_id, user, content):
        self.document_id = document_id
        self.user = user
        self.content = content
        # Additional document attributes, if any

class Suggestion:
    def __init__(self, suggestion_id, document, suggestion_type, message):
        self.suggestion_id = suggestion_id
        self.document = document
        self.suggestion_type = suggestion_type
        self.message = message
        # Additional suggestion attributes, if any

class GrammarlySystem:
    def __init__(self):
        self.users = {}  # Dictionary to store users {user_id: User}
        self.documents = {}  # Dictionary to store documents {document_id: Document}
        self.suggestions = []  # List to store suggestions [Suggestion]

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

    def add_document(self, document):
        self.documents[document.document_id] = document

    def generate_suggestion(self, document, suggestion_type, message):
        suggestion_id = len(self.suggestions) + 1
        suggestion = Suggestion(suggestion_id, document, suggestion_type, message)
        self.suggestions.append(suggestion)

from flask import Flask, request, jsonify

app = Flask(__name__)

# Temporary storage for users and documents (replace with a proper database in production)
users = {}
documents = {}


# User Management API
@app.route('/api/users', methods=['POST'])
def create_user():
    data = request.get_json()
    user_id = data.get('user_id')
    name = data.get('name')
    # Perform validation on user data
    if not user_id or not name:
        return jsonify({'error': 'User ID and Name are required fields'}), 400
    if user_id in users:
        return jsonify({'error': 'User ID already exists'}), 409

    users[user_id] = {'name': name}
    return jsonify({'message': 'User created successfully'}), 201


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


# Document Management API
@app.route('/api/documents', methods=['POST'])
def create_document():
    data = request.get_json()
    user_id = data.get('user_id')
    document_id = data.get('document_id')
    content = data.get('content')
    # Perform validation on document data
    if not user_id or not document_id or not content:
        return jsonify({'error': 'User ID, Document ID, and Content are required fields'}), 400
    if document_id in documents:
        return jsonify({'error': 'Document ID already exists'}), 409

    documents[document_id] = {'user_id': user_id, 'content': content}
    return jsonify({'message': 'Document created successfully'}), 201


@app.route('/api/documents/<document_id>', methods=['GET'])
def get_document(document_id):
    document = documents.get(document_id)
    if not document:
        return jsonify({'error': 'Document not found'}), 404
    return jsonify(document), 200


# Suggestions API
@app.route('/api/suggestions/<document_id>', methods=['GET'])
def get_suggestions(document_id):
    document = documents.get(document_id)
    if not document:
        return jsonify({'error': 'Document not found'}), 404
    # Replace the following line with actual suggestion retrieval logic based on the document's content
    suggestions = ['Replace "good" with "excellent"', 'Fix grammar in paragraph 3']
    return jsonify({'suggestions': suggestions}), 200


# Feedback API
@app.route('/api/feedback/<suggestion_id>', methods=['POST'])
def submit_feedback(suggestion_id):
    data = request.get_json()
    feedback = data.get('feedback')
    # Perform validation on feedback data
    if not feedback:
        return jsonify({'error': 'Feedback is required'}), 400
    # Replace the following line with actual feedback submission logic based on the suggestion ID
    return jsonify({'message': 'Feedback submitted successfully'}), 201


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

from flask import Flask, request, jsonify

app = Flask(__name__)
grammarly_system = GrammarlySystem()

# User Management API
@app.route('/users', methods=['POST'])
def create_user():
    data = request.json
    user = User(data['user_id'], data['username'], data['password'])
    grammarly_system.add_user(user)
    return jsonify(message='User created successfully'), 201

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

@app.route('/users/<int:user_id>', methods=['PATCH'])
def update_user(user_id):
    user = grammarly_system.users.get(user_id)
    if user:
        data = request.json
        user.bio = data.get('bio', user.bio)
        return jsonify(message='Profile updated successfully'), 200
    else:
        return jsonify(message='User not found'), 404

@app.route('/login', methods=['POST'])
def login():
    data = request.json
    user = grammarly_system.users.get(data['user_id'])
    if user and user.password == data['password']:
        return jsonify(message='Login successful'), 200
    else:
        return jsonify(message='Login failed'), 401

# Document Management API
@app.route('/documents', methods=['POST'])
def upload_document():
    data = request.json
    user = grammarly_system.users.get(data['user_id'])
    if user:
        document_id = len(grammarly_system.documents) + 1
        document = Document(document_id, user, data['content'])
        grammarly_system.add_document(document)
        return jsonify(message='Document uploaded successfully'), 200
    else:
        return jsonify(message='User not found'), 404

@app.route('/documents/<int:document_id>', methods=['GET'])
def get_document(document_id):
    document = grammarly_system.documents.get(document_id)
    if document:
        return jsonify(document.__dict__), 200
    else:
        return jsonify(message='Document not found'), 404

# Suggestion API
@app.route('/documents/<int:document_id>/suggestions', methods=['POST'])
def generate_suggestion(document_id):
    document = grammarly_system.documents.get(document_id)
    if document:
        data = request.json
        suggestion_id = len(grammarly_system.suggestions) + 1
        suggestion = Suggestion(suggestion_id, document, data['suggestion_type'], data['message'])
        grammarly_system.suggestions.append(suggestion)
        return jsonify(message='Suggestion generated successfully'), 200
    else:
        return jsonify(message='Document not found'), 404

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

User Management API:

POST /api/users: Create a new user account.
GET /api/users/{user_id}: Retrieve user details.
PUT /api/users/{user_id}: Update user information.
DELETE /api/users/{user_id}: Delete a user account.

Document Management API:

POST /api/documents: Create a new document for a user.
GET /api/documents/{document_id}: Retrieve a specific document.
PUT /api/documents/{document_id}: Update an existing document.
DELETE /api/documents/{document_id}: Delete a document.

Suggestions API:

GET /api/suggestions/{document_id}: Retrieve suggestions for a specific document.
Feedback API:

POST /api/feedback/{suggestion_id}: Submit feedback on a suggestion.

from flask import Flask, request, jsonify

app = Flask(__name__)

# Temporary storage for users and documents (replace with a proper database in production)
users = {}
documents = {}


# User Management API
@app.route('/api/users', methods=['POST'])
def create_user():
    data = request.get_json()
    user_id = data.get('user_id')
    name = data.get('name')
    # Perform validation on user data
    if not user_id or not name:
        return jsonify({'error': 'User ID and Name are required fields'}), 400
    if user_id in users:
        return jsonify({'error': 'User ID already exists'}), 409

    users[user_id] = {'name': name}
    return jsonify({'message': 'User created successfully'}), 201


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


@app.route('/api/users/<user_id>', methods=['PUT'])
def update_user(user_id):
    user = users.get(user_id)
    if not user:
        return jsonify({'error': 'User not found'}), 404
    
    data = request.get_json()
    new_name = data.get('name')
    if not new_name:
        return jsonify({'error': 'Name is a required field'}), 400
    
    user['name'] = new_name
    return jsonify({'message': 'User information updated successfully'}), 200


@app.route('/api/users/<user_id>', methods=['DELETE'])
def delete_user(user_id):
    if user_id not in users:
        return jsonify({'error': 'User not found'}), 404
    
    del users[user_id]
    return jsonify({'message': 'User deleted successfully'}), 200


# Document Management API
@app.route('/api/documents', methods=['POST'])
def create_document():
    data = request.get_json()
    user_id = data.get('user_id')
    document_id = data.get('document_id')
    content = data.get('content')
    # Perform validation on document data
    if not user_id or not document_id or not content:
        return jsonify({'error': 'User ID, Document ID, and Content are required fields'}), 400
    if document_id in documents:
        return jsonify({'error': 'Document ID already exists'}), 409

    documents[document_id] = {'user_id': user_id, 'content': content}
    return jsonify({'message': 'Document created successfully'}), 201


@app.route('/api/documents/<document_id>', methods=['GET'])
def get_document(document_id):
    document = documents.get(document_id)
    if not document:
        return jsonify({'error': 'Document not found'}), 404
    return jsonify(document), 200


@app.route('/api/documents/<document_id>', methods=['PUT'])
def update_document(document_id):
    document = documents.get(document_id)
    if not document:
        return jsonify({'error': 'Document not found'}), 404
    
    data = request.get_json()
    new_content = data.get('content')
    if not new_content:
        return jsonify({'error': 'Content is a required field'}), 400
    
    document['content'] = new_content
    return jsonify({'message': 'Document updated successfully'}), 200


@app.route('/api/documents/<document_id>', methods=['DELETE'])
def delete_document(document_id):
    if document_id not in documents:
        return jsonify({'error': 'Document not found'}), 404
    
    del documents[document_id]
    return jsonify({'message': 'Document deleted successfully'}), 200


# Suggestions API
@app.route('/api/suggestions/<document_id>', methods=['GET'])
def get_suggestions(document_id):
    document = documents.get(document_id)
    if not document:
        return jsonify({'error': 'Document not found'}), 404
    # Replace the following line with actual suggestion retrieval logic based on the document's content
    suggestions = ['Replace "good" with "excellent"', 'Fix grammar in paragraph 3']
    return jsonify({'suggestions': suggestions}), 200


# Feedback API
@app.route('/api/feedback/<suggestion_id>', methods=['POST'])
def submit_feedback(suggestion_id):
    data = request.get_json()
    feedback = data.get('feedback')
    # Perform validation on feedback data
    if not feedback:
        return jsonify({'error': 'Feedback is required'}), 400
    # Replace the following line with actual feedback submission logic based on the suggestion ID
    return jsonify({'message': 'Feedback submitted successfully'}), 201


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

class Brainly:
    def __init__(self):
        self.users = []
        self.questions = []
        self.answers = []

    def post_question(self, user_id, title, content, subject):
        question_id = len(self.questions) + 1
        self.questions.append({
            "question_id": question_id,
            "user_id": user_id,
            "title": title,
            "content": content,
            "subject": subject,
            "answers": []
        })
        return question_id

    def post_answer(self, user_id, question_id, content):
        if question_id > len(self.questions) or question_id < 1:
            return "Invalid question_id"

        answer_id = len(self.answers) + 1
        self.answers.append({
            "answer_id": answer_id,
            "user_id": user_id,
            "question_id": question_id,
            "content": content
        })
        self.questions[question_id - 1]["answers"].append(answer_id)
        return "Answer posted successfully"


# Test the Brainly class simulation
if __name__ == "__main__":
    brainly = Brainly()

    user1_id = 1
    user2_id = 2

    # Post a new question and get its question_id
    question_id = brainly.post_question(user1_id, "How to solve quadratic equations?", "I need help with solving quadratic equations.", "Mathematics")
    print("Question posted. Question ID:", question_id)

    # Post an answer to the question
    brainly.post_answer(user2_id, question_id, "To solve quadratic equations, you can use the quadratic formula.")
    print("Answer posted.")

Users:

UserID (Primary Key)
Username
Email
Password

Questions:

QuestionID (Primary Key)
UserID (Foreign Key referencing Users.UserID)
Title
Content
Timestamp

Answers:

AnswerID (Primary Key)
UserID (Foreign Key referencing Users.UserID)
QuestionID (Foreign Key referencing Questions.QuestionID)
Content
Timestamp

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

class Question:
    def __init__(self, question_id, user, title, content):
        self.question_id = question_id
        self.user = user
        self.title = title
        self.content = content
        # Other question attributes like timestamp, tags, etc.

class Answer:
    def __init__(self, answer_id, user, question, content):
        self.answer_id = answer_id
        self.user = user
        self.question = question
        self.content = content
        # Other answer attributes like timestamp, upvotes, etc.

class Brainly:
    def __init__(self):
        self.users = {}
        self.questions = {}
        self.answers = {}
    
    def add_user(self, user_id, username, password):
        user = User(user_id, username, password)
        self.users[user_id] = user

    def create_question(self, question_id, user_id, title, content):
        user = self.users.get(user_id)
        if not user:
            raise ValueError("User not found")
        question = Question(question_id, user, title, content)
        self.questions[question_id] = question
    
    def create_answer(self, answer_id, user_id, question_id, content):
        user = self.users.get(user_id)
        question = self.questions.get(question_id)
        if not user or not question:
            raise ValueError("User or Question not found")
        answer = Answer(answer_id, user, question, content)
        self.answers[answer_id] = answer

    # Other methods for handling likes, comments, follow/unfollow, etc.

from flask import Flask, request, jsonify

app = Flask(__name__)

# Sample data storage (replace this with actual database)
users = []
questions = []
answers = []


# User Authentication API
@app.route('/api/auth/register', methods=['POST'])
def register():
    data = request.get_json()
    users.append(data)
    return jsonify({"message": "User registered successfully"}), 201


@app.route('/api/auth/login', methods=['POST'])
def login():
    data = request.get_json()
    # Implement user login logic here
    # Generate and return JWT token on successful login
    token = "JWT_token_here"
    return jsonify({"token": token}), 200


@app.route('/api/auth/logout', methods=['POST'])
def logout():
    # Implement user logout logic here
    return jsonify({"message": "Logged out successfully"}), 200


# Question and Answer API
@app.route('/api/questions', methods=['POST'])
def post_question():
    data = request.get_json()
    questions.append(data)
    return jsonify({"message": "Question posted successfully"}), 201


@app.route('/api/questions/<int:question_id>', methods=['GET', 'PUT', 'DELETE'])
def question_detail(question_id):
    # Check if question with question_id exists
    if question_id >= len(questions) or question_id < 0:
        return jsonify({"error": "Question not found"}), 404

    if request.method == 'GET':
        return jsonify({"question": questions[question_id]}), 200
    elif request.method == 'PUT':
        data = request.get_json()
        questions[question_id].update(data)
        return jsonify({"message": "Question updated successfully"}), 200
    elif request.method == 'DELETE':
        del questions[question_id]
        return jsonify({"message": "Question deleted successfully"}), 200


@app.route('/api/questions/<int:question_id>/answers', methods=['POST'])
def post_answer(question_id):
    data = request.get_json()
    # Check if question with question_id exists
    if question_id >= len(questions) or question_id < 0:
        return jsonify({"error": "Question not found"}), 404

    answers.append(data)
    return jsonify({"message": "Answer posted successfully"}), 201


# Search API
@app.route('/api/search', methods=['GET'])
def search():
    keyword = request.args.get('q')
    subject = request.args.get('subject')
    # Implement logic for searching questions and answers based on keyword and subject
    # For this example, we will return all questions as search results
    return jsonify({"results": questions}), 200


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

User Authentication API
Endpoint: /api/auth/register (POST)

Description: Allows users to register a new account.
Request Body: { "username": "example_user", "email": "[email protected]", "password": "secure_password" }
Response: { "message": "User registered successfully" }
Endpoint: /api/auth/login (POST)

Description: Allows users to log in to their accounts.
Request Body: { "username": "example_user", "password": "secure_password" }
Response: { "token": "JWT_token_here" }
Endpoint: /api/auth/logout (POST)

Description: Allows users to log out and invalidate the JWT token.
Request Headers: { "Authorization": "Bearer JWT_token_here" }
Response: { "message": "Logged out successfully" }

Question and Answer API
Endpoint: /api/questions (POST)

Description: Allows users to post new questions.
Request Headers: { "Authorization": "Bearer JWT_token_here" }
Request Body: { "title": "Question Title", "content": "Question content goes here", "subject": "Mathematics" }
Response: { "message": "Question posted successfully" }
Endpoint: /api/questions/{question_id} (GET)

Description: Retrieves a specific question and its answers.
Request Headers: { "Authorization": "Bearer JWT_token_here" }
Response: { "question_id": 1, "title": "Question Title", "content": "Question content goes here", "subject": "Mathematics", "answers": [ { "answer_id": 1, "content": "Answer content goes here", "user_id": 2 }, ... ] }
Endpoint: /api/questions/{question_id} (PUT)

Description: Allows users to update their own questions.
Request Headers: { "Authorization": "Bearer JWT_token_here" }
Request Body: { "title": "Updated Question Title", "content": "Updated question content goes here" }
Response: { "message": "Question updated successfully" }
Endpoint: /api/questions/{question_id} (DELETE)

Description: Allows users to delete their own questions.
Request Headers: { "Authorization": "Bearer JWT_token_here" }
Response: { "message": "Question deleted successfully" }
Endpoint: /api/questions/{question_id}/answers (POST)

Description: Allows users to post answers to a specific question.
Request Headers: { "Authorization": "Bearer JWT_token_here" }
Request Body: { "content": "Answer content goes here" }
Response: { "message": "Answer posted successfully" }

Search API
Endpoint: /api/search (GET)
Description: Allows users to search for questions and answers based on keywords and subjects.
Query Parameters: ?q=keyword&subject=Mathematics
Response: { "results": [ { "question_id": 1, "title": "Question Title", "content": "Question content goes here" }, ... ] }

from flask import Flask, request

app = Flask(__name__)

users = {}
questions = {}
answers = {}
user_counter = 1
question_counter = 1
answer_counter = 1

# Endpoint for creating a new user
@app.route('/users', methods=['POST'])
def create_user():
    global user_counter
    data = request.get_json()
    user_id = f"user_{user_counter}"
    user = User(user_id, data['username'], data['password'])
    users[user_id] = user
    user_counter += 1
    return {"message": "User created successfully"}, 201

# Endpoint for creating a new question
@app.route('/questions', methods=['POST'])
def create_question():
    global question_counter
    data = request.get_json()
    user_id = data['user_id']
    user = users.get(user_id)
    if not user:
        return {"message": "User not found"}, 404
    question_id = f"question_{question_counter}"
    question = Question(question_id, user, data['title'], data['content'])
    questions[question_id] = question
    question_counter += 1
    return {"message": "Question created successfully"}, 201

# Endpoint for creating a new answer
@app.route('/answers', methods=['POST'])
def create_answer():
    global answer_counter
    data = request.get_json()
    user_id = data['user_id']
    question_id = data['question_id']
    user = users.get(user_id)
    question = questions.get(question_id)
    if not user or not question:
        return {"message": "User or Question not found"}, 404
    answer_id = f"answer_{answer_counter}"
    answer = Answer(answer_id, user, question, data['content'])
    answers[answer_id] = answer
    answer_counter += 1
    return {"message": "Answer created successfully"}, 201

class Brainly:
    def __init__(self):
        self.users = []
        self.questions = []
        self.answers = []
        self.points = {}  # Dictionary to store user points

    # Function to post a new question
    def post_question(self, user_id, title, content, subject):
        question_id = len(self.questions) + 1
        self.questions.append({
            "question_id": question_id,
            "user_id": user_id,
            "title": title,
            "content": content,
            "subject": subject,
            "answers": []
        })
        return question_id

    # Function to post an answer to a question
    def post_answer(self, user_id, question_id, content):
        if question_id > len(self.questions) or question_id < 1:
            return "Invalid question_id"
        
        answer_id = len(self.answers) + 1
        self.answers.append({
            "answer_id": answer_id,
            "user_id": user_id,
            "question_id": question_id,
            "content": content
        })
        self.questions[question_id - 1]["answers"].append(answer_id)
        return "Answer posted successfully"

    # Function to get a specific question and its answers
    def get_question_with_answers(self, question_id):
        if question_id > len(self.questions) or question_id < 1:
            return "Invalid question_id"
        
        question = self.questions[question_id - 1]
        answers = [ans for ans in self.answers if ans["question_id"] == question_id]
        return {"question": question, "answers": answers}

    # Function to give points to a user for contributing
    def give_points_to_user(self, user_id, points):
        if user_id not in self.points:
            self.points[user_id] = 0
        self.points[user_id] += points

    # Function to get points of a user
    def get_user_points(self, user_id):
        return self.points.get(user_id, 0)


# Test the Brainly class
if __name__ == "__main__":
    brainly = Brainly()

    user1_id = 1
    user2_id = 2

    # 2.1 Post a new question and get its question_id
    question_id = brainly.post_question(user1_id, "How to solve quadratic equations?", "I need help with solving quadratic equations.", "Mathematics")
    print("Question posted. Question ID:", question_id)

    # 2.2 Post an answer to the question
    brainly.post_answer(user2_id, question_id, "To solve quadratic equations, you can use the quadratic formula.")
    print("Answer posted.")

    # 2.6 Get the question and its answers
    question_data = brainly.get_question_with_answers(question_id)
    print("Question:", question_data["question"])
    print("Answers:", question_data["answers"])

    # 2.3 Give points to users for contributing
    brainly.give_points_to_user(user1_id, 5)
    brainly.give_points_to_user(user2_id, 10)

    # 2.7 Get points of users
    print("Points of User 1:", brainly.get_user_points(user1_id))
    print("Points of User 2:", brainly.get_user_points(user2_id))

class NubankSimulation:
    def __init__(self):
        self.total_users = 10000000
        self.daily_active_users = 2000000
        self.transactions_per_user_per_day = 5
        self.total_transactions_per_day = self.daily_active_users * self.transactions_per_user_per_day
        self.read_to_write_ratio = 100
        self.storage_per_transaction = 1  # KB
        self.storage_per_day = self.total_transactions_per_day * self.storage_per_transaction  # KB
        self.storage_for_three_years = self.storage_per_day * 365 * 3  # KB
        self.requests_per_second = self.total_transactions_per_day / (24 * 3600)

    def print_scalability_requirements(self):
        print("Scalability Requirements for Nubank Simulation:")
        print("Total number of users:", self.total_users)
        print("Daily active users (DAU):", self.daily_active_users)
        print("Total number of transactions per day:", self.total_transactions_per_day)
        print("Read to write ratio:", self.read_to_write_ratio)
        print("Storage per day:", self.storage_per_day, "KB")
        print("Storage for the next 3 years:", self.storage_for_three_years, "KB")
        print("Requests per second:", self.requests_per_second)

if __name__ == "__main__":
    nubank_simulation = NubankSimulation()
    nubank_simulation.print_scalability_requirements()

User:

User_id: Int (Primary Key)
Username: String
Email: String
Password: String
Other user attributes (e.g., Name, Phone, Address, etc.)
CreditCard:

Card_id: Int (Primary Key)
User_id: Int (Foreign Key from User table)
Card_number: String (masked)
Expiration_date: String (masked)
Other credit card attributes (e.g., Card type, CVV, etc.)
Transaction:

Transaction_id: Int (Primary Key)
User_id: Int (Foreign Key from User table)
Card_id: Int (Foreign Key from CreditCard table)
Amount: Decimal
Merchant: String
Timestamp: DateTime

from flask import Flask, request, jsonify

app = Flask(__name__)

# Sample in-memory data for demonstration purposes
users = [
    {"id": 1, "name": "Alice", "email": "[email protected]"},
    {"id": 2, "name": "Bob", "email": "[email protected]"},
]

# Low-level API endpoints for User resource
@app.route("/api/users", methods=["GET"])
def get_users():
    return jsonify(users)

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

@app.route("/api/users", methods=["POST"])
def create_user():
    new_user = request.json
    new_user["id"] = len(users) + 1
    users.append(new_user)
    return jsonify(new_user), 201

@app.route("/api/users/<int:user_id>", methods=["PUT"])
def update_user(user_id):
    user = next((user for user in users if user["id"] == user_id), None)
    if user:
        updated_user = request.json
        user.update(updated_user)
        return jsonify(user)
    return jsonify({"message": "User not found"}), 404

@app.route("/api/users/<int:user_id>", methods=["DELETE"])
def delete_user(user_id):
    global users
    users = [user for user in users if user["id"] != user_id]
    return jsonify({"message": "User deleted"}), 200

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

User Management API:

Endpoint: /users (POST)

Description: Create a new user account.

Request Body: { "username": "john_doe", "email": "[email protected]", "password": "password123" }

Endpoint: /users/{user_id} (GET)

Description: Get user details by user_id.

Endpoint: /users/{user_id} (PATCH)

Description: Update user details by user_id.

Request Body: { "email": "[email protected]" }

Credit Card API:

Endpoint: /users/{user_id}/creditcards (POST)

Description: Add a new credit card for a user.

Request Body: { "card_number": "1234-5678-9012-3456", "expiration_date": "12/25" }

Endpoint: /users/{user_id}/creditcards (GET)

Description: Get all credit cards associated with a user.

Transaction API:

Endpoint: /users/{user_id}/transactions (POST)

Description: Make a new transaction for a user.

Request Body: { "amount": 100.00, "merchant": "Online Store" }

Endpoint: /users/{user_id}/transactions (GET)

Description: Get all transactions for a user.

Feed API:

Endpoint: /users/{user_id}/feed (GET)
Description: Get the feed of transactions for a user (sorted by timestamp, latest first).
Account API:

Endpoint: /users/{user_id}/account (GET)
Description: Get the account details of a user (e.g., balance, credit limit, etc.).
Notification API:

Endpoint: /users/{user_id}/notifications (GET)

Description: Get all notifications for a user.

Endpoint: /users/{user_id}/notifications/{notification_id} (PATCH)

Description: Mark a notification as read.

Request Body: { "read": true }

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

app = Flask(__name__)

# Sample data to be stored in the server
users = {}
credit_cards = {}
transactions = {}
feeds = {}
accounts = {}
notifications = {}

# User Service
@app.route('/users', methods=['POST'])
def create_user():
    data = request.get_json()
    user_id = str(uuid.uuid4())
    users[user_id] = {
        "username": data["username"],
        "email": data["email"],
        "password": data["password"],
    }
    accounts[user_id] = {
        "balance": 0.0,
        "credit_limit": 1000.0,
    }
    return jsonify({"user_id": user_id}), 201

@app.route('/users/<string: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('/users/<string:user_id>', methods=['PATCH'])
def update_user(user_id):
    if user_id in users:
        data = request.get_json()
        for key, value in data.items():
            users[user_id][key] = value
        return jsonify({"message": "User details updated successfully"}), 200
    else:
        return jsonify({"message": "User not found"}), 404

# Credit Card Service
@app.route('/users/<string:user_id>/creditcards', methods=['POST'])
def add_credit_card(user_id):
    if user_id in users:
        data = request.get_json()
        card_id = str(uuid.uuid4())
        credit_cards[card_id] = {
            "user_id": user_id,
            "card_number": data["card_number"],
            "expiration_date": data["expiration_date"],
        }
        return jsonify({"card_id": card_id}), 201
    else:
        return jsonify({"message": "User not found"}), 404

@app.route('/users/<string:user_id>/creditcards', methods=['GET'])
def get_credit_cards(user_id):
    if user_id in users:
        user_credit_cards = [credit_cards[card_id] for card_id in credit_cards if credit_cards[card_id]["user_id"] == user_id]
        return jsonify(user_credit_cards), 200
    else:
        return jsonify({"message": "User not found"}), 404

# Transaction Service
@app.route('/users/<string:user_id>/transactions', methods=['POST'])
def make_transaction(user_id):
    if user_id in users:
        data = request.get_json()
        transaction_id = str(uuid.uuid4())
        amount = float(data["amount"])
        merchant = data["merchant"]
        timestamp = datetime.datetime.now().isoformat()

        transactions[transaction_id] = {
            "user_id": user_id,
            "amount": amount,
            "merchant": merchant,
            "timestamp": timestamp,
        }

        # Update account balance
        accounts[user_id]["balance"] -= amount

        return jsonify({"transaction_id": transaction_id}), 201
    else:
        return jsonify({"message": "User not found"}), 404

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

# Feed Service
@app.route('/users/<string:user_id>/feed', methods=['GET'])
def get_feed(user_id):
    if user_id in users:
        user_feed = [transactions[transaction_id] for transaction_id in transactions if transactions[transaction_id]["user_id"] in accounts[user_id]["following"]]
        sorted_feed = sorted(user_feed, key=lambda x: x["timestamp"], reverse=True)
        return jsonify(sorted_feed), 200
    else:
        return jsonify({"message": "User not found"}), 404

# Account Service
@app.route('/users/<string:user_id>/account', methods=['GET'])
def get_account(user_id):
    if user_id in users:
        return jsonify(accounts[user_id]), 200
    else:
        return jsonify({"message": "User not found"}), 404

# Notification Service
@app.route('/users/<string:user_id>/notifications', methods=['GET'])
def get_notifications(user_id):
    if user_id in users:
        user_notifications = [notification for notification in notifications.values() if notification["recipient_id"] == user_id]
        return jsonify(user_notifications), 200
    else:
        return jsonify({"message": "User not found"}), 404

@app.route('/users/<string:user_id>/notifications/<string:notification_id>', methods=['PATCH'])
def mark_notification_as_read(user_id, notification_id):
    if user_id in users and notification_id in notifications:
        notifications[notification_id]["read"] = True
        return jsonify({"message": "Notification marked as read"}), 200
    else:
        return jsonify({"message": "User or notification not found"}), 404

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

class CreditCard:
    def __init__(self, card_number, expiration_date):
        self.card_number = card_number
        self.expiration_date = expiration_date


class User:
    def __init__(self, name, email):
        self.name = name
        self.email = email
        self.credit_card = None
        self.transactions = []

    def add_credit_card(self, card_number, expiration_date):
        self.credit_card = CreditCard(card_number, expiration_date)

    def block_credit_card(self):
        self.credit_card = None


class NubankApp:
    def __init__(self):
        self.users = []
        self.rewards_program = {}

    def add_user(self, name, email):
        user = User(name, email)
        self.users.append(user)
        return user

    def get_user_by_email(self, email):
        for user in self.users:
            if user.email == email:
                return user
        return None

    def add_reward_program(self, user_email, cashback_percent, discounts):
        self.rewards_program[user_email] = {"cashback_percent": cashback_percent, "discounts": discounts}

    def perform_transaction(self, user_email, amount, merchant):
        user = self.get_user_by_email(user_email)
        if user:
            user.transactions.append({"amount": amount, "merchant": merchant})
            return True
        return False


if __name__ == "__main__":
    # Create a NubankApp instance
    nubank_app = NubankApp()

    # Add users
    user1 = nubank_app.add_user("Alice", "[email protected]")
    user2 = nubank_app.add_user("Bob", "[email protected]")

    # Add credit cards to users
    user1.add_credit_card("1234567890123456", "12/25")
    user2.add_credit_card("9876543210987654", "10/24")

    # Block credit card for user2
    user2.block_credit_card()

    # Add reward program for users
    nubank_app.add_reward_program("[email protected]", 5, ["Restaurant Discounts", "Travel Deals"])
    nubank_app.add_reward_program("[email protected]", 3, ["Grocery Cashback"])

    # Perform transactions for users
    nubank_app.perform_transaction("[email protected]", 100, "Restaurant XYZ")
    nubank_app.perform_transaction("[email protected]", 50, "Grocery Store ABC")

    # Display user information and transactions
    print("User 1:")
    print("Name:", user1.name)
    print("Email:", user1.email)
    print("Credit Card:", user1.credit_card.card_number if user1.credit_card else "Not Available")
    print("Transactions:", user1.transactions)
    print()

    print("User 2:")
    print("Name:", user2.name)
    print("Email:", user2.email)
    print("Credit Card:", user2.credit_card.card_number if user2.credit_card else "Not Available")
    print("Transactions:", user2.transactions)

from flask import Flask, request, jsonify

app = Flask(__name__)

# Mock data for user registration and authentication
users = []

# Mock data for cryptocurrency wallet
wallet = {}

# Mock data for open orders
open_orders = []

# Mock data for rewards
rewards = {}

# Helper function for user authentication
def authenticate_user(username, password):
    for user in users:
        if user['username'] == username and user['password'] == password:
            return True
    return False

# API endpoint for user registration
@app.route('/api/register', methods=['POST'])
def register_user():
    data = request.get_json()
    # Perform validation on data (e.g., username, password)
    if 'username' in data and 'password' in data:
        users.append(data)
        return jsonify({'message': 'User registered successfully!'}), 201
    return jsonify({'error': 'Invalid data. Username and password are required.'}), 400

# API endpoint for user login
@app.route('/api/login', methods=['POST'])
def login_user():
    data = request.get_json()
    # Perform validation on data (e.g., username, password)
    if 'username' in data and 'password' in data:
        if authenticate_user(data['username'], data['password']):
            return jsonify({'message': 'Login successful!'}), 200
        else:
            return jsonify({'error': 'Invalid username or password.'}), 401
    return jsonify({'error': 'Invalid data. Username and password are required.'}), 400

# API endpoint for placing a buy order
@app.route('/api/buy', methods=['POST'])
def buy_cryptocurrency():
    data = request.get_json()
    # Perform validation on data (e.g., user authentication, order details)
    if 'username' in data and 'password' in data and 'currency' in data and 'amount' in data:
        if authenticate_user(data['username'], data['password']):
            # Place the buy order in the 'open_orders' list
            open_orders.append(data)
            return jsonify({'message': 'Buy order placed successfully!'}), 200
        else:
            return jsonify({'error': 'Invalid username or password.'}), 401
    return jsonify({'error': 'Invalid data. Username, password, currency, and amount are required.'}), 400

# API endpoint for retrieving the user's cryptocurrency wallet balance
@app.route('/api/wallet', methods=['GET'])
def get_wallet_balance():
    # Retrieve the wallet balance for the authenticated user
    # For simplicity, we'll just return the mock 'wallet' data
    return jsonify(wallet), 200

# API endpoint for depositing cryptocurrency to the user's wallet
@app.route('/api/wallet/deposit', methods=['POST'])
def deposit_to_wallet():
    data = request.get_json()
    # Perform validation on data (e.g., user authentication, deposit details)
    if 'username' in data and 'password' in data and 'currency' in data and 'amount' in data:
        if authenticate_user(data['username'], data['password']):
            # Update the wallet balance for the authenticated user
            wallet[data['currency']] = wallet.get(data['currency'], 0) + data['amount']
            return jsonify({'message': 'Deposit successful!'}), 200
        else:
            return jsonify({'error': 'Invalid username or password.'}), 401
    return jsonify({'error': 'Invalid data. Username, password, currency, and amount are required.'}), 400

# API endpoint for staking a cryptocurrency for rewards
@app.route('/api/stake', methods=['POST'])
def stake_cryptocurrency():
    data = request.get_json()
    # Perform validation on data (e.g., user authentication, staking details)
    if 'username' in data and 'password' in data and 'currency' in data and 'amount' in data:
        if authenticate_user(data['username'], data['password']):
            # Store the staking information in the 'rewards' dictionary
            rewards[data['currency']] = rewards.get(data['currency'], 0) + data['amount']
            return jsonify({'message': 'Staking successful!'}), 200
        else:
            return jsonify({'error': 'Invalid username or password.'}), 401
    return jsonify({'error': 'Invalid data. Username, password, currency, and amount are required.'}), 400

# API endpoint for unstaking a cryptocurrency and claiming rewards
@app.route('/api/unstake', methods=['POST'])
def unstake_cryptocurrency():
    data = request.get_json()
    # Perform validation on data (e.g., user authentication, unstaking details)
    if 'username' in data and 'password' in data and 'currency' in data and 'amount' in data:
        if authenticate_user(data['username'], data['password']):
            # Update the 'rewards' dictionary and return the claimed rewards
            rewards[data['currency']] -= data['amount']
            return jsonify({'message': 'Unstaking successful!', 'reward': data['amount']}), 200
        else:
            return jsonify({'error': 'Invalid username or password.'}), 401
    return jsonify({'error': 'Invalid data. Username, password, currency, and amount are required.'}), 400

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

Authentication

/api/register - POST: Register a new user with the system.
/api/login - POST: User login to the platform.
/api/logout - POST: User logout and invalidate the session.
Cryptocurrency Trading

/api/buy - POST: Place a buy order for a cryptocurrency.
/api/sell - POST: Place a sell order for a cryptocurrency.
Wallet Management

/api/wallet - GET: Retrieve the user's cryptocurrency wallet balance.
/api/wallet/deposit - POST: Deposit cryptocurrency to the user's wallet.
/api/wallet/withdraw - POST: Withdraw cryptocurrency from the user's wallet.
Reward Staking

/api/stake - POST: Stake a specific cryptocurrency for rewards.
/api/unstake - POST: Unstake a cryptocurrency and claim rewards.

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

    def place_buy_order(self, user_id, currency, amount, price):
        self.orders.append({'user_id': user_id, 'type': 'buy', 'currency': currency, 'amount': amount, 'price': price})

    def place_sell_order(self, user_id, currency, amount, price):
        self.orders.append({'user_id': user_id, 'type': 'sell', 'currency': currency, 'amount': amount, 'price': price})

    def get_real_time_market_data(self):
        # Implement logic to fetch real-time market data
        pass


class CryptoWallet:
    def __init__(self):
        self.wallet = {}

    def deposit(self, user_id, currency, amount):
        if currency in self.wallet:
            self.wallet[currency] += amount
        else:
            self.wallet[currency] = amount

    def withdraw(self, user_id, currency, amount):
        if currency in self.wallet and self.wallet[currency] >= amount:
            self.wallet[currency] -= amount
        else:
            raise ValueError("Insufficient balance")

    def get_wallet_balance(self, user_id):
        return self.wallet


class VisaDebitCard:
    def __init__(self):
        self.balance = 0

    def spend(self, amount):
        if self.balance >= amount:
            self.balance -= amount
            return True
        return False


class PaymentGateway:
    def process_payment(self, user_id, currency, amount):
        # Implement logic to process payment using Crypto.com's payment gateway
        pass


class EarnAndStaking:
    def __init__(self):
        self.staking_rewards = {}

    def stake_cryptocurrency(self, user_id, currency, amount):
        if currency in self.staking_rewards:
            self.staking_rewards[currency] += amount
        else:
            self.staking_rewards[currency] = amount

    def unstake_cryptocurrency(self, user_id, currency, amount):
        if currency in self.staking_rewards and self.staking_rewards[currency] >= amount:
            self.staking_rewards[currency] -= amount
            return amount * 0.1  # Assuming a fixed 10% reward for staking
        return 0

    def get_staking_rewards(self, user_id):
        return self.staking_rewards


class CryptoEarn:
    def __init__(self):
        self.earn_rewards = {}

    def earn_interest(self, user_id, currency, amount):
        if currency in self.earn_rewards:
            self.earn_rewards[currency] += amount * 0.05  # Assuming a fixed 5% annual interest
        else:
            self.earn_rewards[currency] = amount * 0.05

    def get_earn_rewards(self, user_id):
        return self.earn_rewards


class CryptoCredit:
    def __init__(self):
        self.credit_limit = {}

    def borrow(self, user_id, currency, amount):
        if currency in self.credit_limit:
            self.credit_limit[currency] += amount
        else:
            self.credit_limit[currency] = amount

    def repay(self, user_id, currency, amount):
        if currency in self.credit_limit and self.credit_limit[currency] >= amount:
            self.credit_limit[currency] -= amount
        else:
            raise ValueError("Insufficient credit limit")