import java.util.*;

class User {
    private String id;
    private String username;
    private List<Message> messages;

    public User(String username) {
        this.id = UUID.randomUUID().toString();
        this.username = username;
        this.messages = new ArrayList<>();
    }

    public void sendMessage(User recipient, String content) {
        Message message = new Message(this, recipient, content);
        messages.add(message);
        recipient.receiveMessage(message);
    }

    public void receiveMessage(Message message) {
        messages.add(message);
    }

    public List<Message> getMessages() {
        return messages;
    }

    // Getters and setters
}

class Message {
    private User sender;
    private User recipient;
    private String content;
    private Date timestamp;

    public Message(User sender, User recipient, String content) {
        this.sender = sender;
        this.recipient = recipient;
        this.content = content;
        this.timestamp = new Date();
    }

    // Getters and setters
}

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

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

    public void registerUser(String username) {
        User user = new User(username);
        users.put(user.getId(), user);
    }

    public void removeUser(String userId) {
        users.remove(userId);
    }

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

public class TelegramApp {
    public static void main(String[] args) {
        TelegramSystem telegram = new TelegramSystem();

        // Register users
        telegram.registerUser("user1");
        telegram.registerUser("user2");

        // Send messages
        User user1 = telegram.getUser("user1");
        User user2 = telegram.getUser("user2");
        user1.sendMessage(user2, "Hello, how are you?");

        // Print messages for a user
        User user = telegram.getUser("user2");
        List<Message> messages = user.getMessages();
        System.out.println("Messages for User: " + user.getUsername());
        for (Message message : messages) {
            System.out.println("Sender: " + message.getSender().getUsername());
            System.out.println("Content: " + message.getContent());
            System.out.println("Timestamp: " + message.getTimestamp());
            System.out.println();
        }
    }
}

from sqlalchemy import Column, String, Integer
from sqlalchemy.ext.declarative import declarative_base

Base = declarative_base()

class User(Base):
    __tablename__ = 'users'
    id = Column(Integer, primary_key=True)
    username = Column(String)
    # Add more user fields as needed

class Message(Base):
    __tablename__ = 'messages'
    id = Column(Integer, primary_key=True)
    sender_id = Column(Integer)
    receiver_id = Column(Integer)
    content = Column(String)
    # Add more message fields as needed

from telegram.ext import Updater, MessageHandler, Filters

def handle_message(update, context):
    message = update.message
    sender_id = message.from_user.id
    receiver_id = message.chat_id
    content = message.text

    # Save the message to the database

    context.bot.send_message(chat_id=receiver_id, text='Reply')

updater = Updater('YOUR_TELEGRAM_API_TOKEN')
dispatcher = updater.dispatcher
dispatcher.add_handler(MessageHandler(Filters.text, handle_message))
updater.start_polling()

def handle_photo(update, context):
    message = update.message
    sender_id = message.from_user.id
    receiver_id = message.chat_id
    photo = message.photo[-1].file_id

    # Save the photo to the server/cloud storage and get the URL

    # Save the URL to the database

    context.bot.send_photo(chat_id=receiver_id, photo=photo)

dispatcher.add_handler(MessageHandler(Filters.photo, handle_photo))

import requests

def send_push_notification(user_id, message):
    # Send push notification using the FCM API
    # Replace with appropriate FCM API endpoint and authorization headers
    endpoint = 'https://fcm.googleapis.com/fcm/send'
    headers = {
        'Authorization': 'YOUR_FCM_AUTHORIZATION',
        'Content-Type': 'application/json'
    }
    data = {
        'to': user_id,
        'notification': {
            'body': message
        }
    }
    response = requests.post(endpoint, headers=headers, json=data)
    # Handle the response

# Call this function when a user receives a new message
send_push_notification(user_id, 'You have a new message!')

class Group(Base):
    __tablename__ = 'groups'
    id = Column(Integer, primary_key=True)
    name = Column(String)

class GroupMessage(Base):
    __tablename__ = 'group_messages'
    id = Column(Integer, primary_key=True)
    group_id = Column(Integer)
    sender_id = Column(Integer)
    content = Column(String)
    # Add more group message fields as needed

def handle_group_message(update, context):
    message = update.message
    group_id = message.chat_id
    sender_id = message.from_user.id
    content = message.text

    # Save the group message to the database

    context.bot.send_message(chat_id=group_id, text='Reply')

dispatcher.add_handler(MessageHandler(Filters.group, handle_group_message))

def handle_media_message(update, context):
    message = update.message
    sender_id = message.from_user.id
    receiver_id = message.chat_id

    if message.text:
        content = message.text
        # Handle text message
    elif message.photo:
        photo = message.photo[-1].file_id
        # Save the photo to the server/cloud storage and get the URL
        # Save the URL to the database
        # Handle photo message
    elif message.video:
        video = message.video.file_id
        # Save the video to the server/cloud storage and get the URL
        # Save the URL to the database
        # Handle video message
    else:
        # Handle unsupported media types

    context.bot.send_message(chat_id=receiver_id, text='Reply')

dispatcher.add_handler(MessageHandler(Filters.media, handle_media_message))

class User(Base):
    __tablename__ = 'users'
    id = Column(Integer, primary_key=True)
    username = Column(String)
    status = Column(String)  # Status message field

def set_status(update, context):
    user_id = update.message.from_user.id
    new_status = update.message.text

    # Update the user's status in the database

    context.bot.send_message(chat_id=user_id, text='Status updated')

dispatcher.add_handler(MessageHandler(Filters.regex(r'^/status'), set_status))

class Leetcode:
    def __init__(self):
        self.problems = []
        self.users = []

    def add_problem(self, problem):
        self.problems.append(problem)

    def add_user(self, user):
        self.users.append(user)

    def get_total_problems_solved(self):
        total_problems_solved = sum(user.problems_solved for user in self.users)
        return total_problems_solved

    def get_total_storage_per_day(self):
        total_storage = len(self.problems) * 1  # Assuming each problem is 1 MB
        return total_storage

    def get_total_storage_for_years(self, num_of_years):
        total_storage_per_day = self.get_total_storage_per_day()
        total_storage_for_years = total_storage_per_day * num_of_years * 365
        return total_storage_for_years

    def get_requests_per_second(self):
        total_active_users = sum(user.is_active for user in self.users)
        requests_per_second = (total_active_users / 3600) * 24
        return requests_per_second


class Problem:
    def __init__(self, title, difficulty):
        self.title = title
        self.difficulty = difficulty


class User:
    def __init__(self, name, is_active, problems_solved):
        self.name = name
        self.is_active = is_active
        self.problems_solved = problems_solved


leetcode = Leetcode()

# Adding problems
leetcode.add_problem(Problem("Two Sum", "Easy"))
leetcode.add_problem(Problem("Add Two Numbers", "Medium"))
# ...

# Adding users
leetcode.add_user(User("John Doe", True, 10))
leetcode.add_user(User("Jane Smith", False, 5))
# ...

# Simulation results
total_problems_solved = leetcode.get_total_problems_solved()
total_storage_per_day = leetcode.get_total_storage_per_day()
total_storage_for_years = leetcode.get_total_storage_for_years(3)
requests_per_second = leetcode.get_requests_per_second()

print(f"Total problems solved: {total_problems_solved}")
print(f"Total storage per day: {total_storage_per_day} MB")
print(f"Total storage for 3 years: {total_storage_for_years} TB")
print(f"Requests per second: {requests_per_second}")

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

class Problem:
    def __init__(self, problem_id, title, difficulty, category):
        self.problem_id = problem_id
        self.title = title
        self.difficulty = difficulty
        self.category = category

class Submission:
    def __init__(self, submission_id, user_id, problem_id, code, timestamp):
        self.submission_id = submission_id
        self.user_id = user_id
        self.problem_id = problem_id
        self.code = code
        self.timestamp = timestamp

class Comment:
    def __init__(self, comment_id, post_id, user_id, text, timestamp):
        self.comment_id = comment_id
        self.post_id = post_id
        self.user_id = user_id
        self.text = text
        self.timestamp = timestamp

# Other classes such as Post, Like, etc. can be added as needed

from flask import Flask, request, jsonify

app = Flask(__name__)

# Sample data for users, problems, submissions, and comments
users = {
    "user1": {
        "user_id": "user1",
        "username": "JohnDoe",
        "password": "password123"
        # Other user attributes
    },
    "user2": {
        "user_id": "user2",
        "username": "JaneSmith",
        "password": "password456"
        # Other user attributes
    }
}

problems = {
    "problem1": {
        "problem_id": "problem1",
        "title": "Two Sum",
        "difficulty": "Easy",
        "category": "Array"
        # Other problem attributes
    },
    "problem2": {
        "problem_id": "problem2",
        "title": "Add Two Numbers",
        "difficulty": "Medium",
        "category": "Linked List"
        # Other problem attributes
    }
}

submissions = {
    "submission1": {
        "submission_id": "submission1",
        "user_id": "user1",
        "problem_id": "problem1",
        "code": "print('Hello, World!')",
        "timestamp": "2022-07-01 10:00:00"
        # Other submission attributes
    },
    "submission2": {
        "submission_id": "submission2",
        "user_id": "user2",
        "problem_id": "problem2",
        "code": "def addTwoNumbers(self, l1, l2): \n    # Code logic...",
        "timestamp": "2022-07-02 14:30:00"
        # Other submission attributes
    }
}

comments = {
    "comment1": {
        "comment_id": "comment1",
        "post_id": "problem1",
        "user_id": "user2",
        "text": "Great problem!",
        "timestamp": "2022-07-01 11:00:00"
        # Other comment attributes
    },
    "comment2": {
        "comment_id": "comment2",
        "post_id": "problem2",
        "user_id": "user1",
        "text": "Nice solution!",
        "timestamp": "2022-07-02 15:00:00"
        # Other comment attributes
    }
}

# User Management API

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

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

@app.route('/users/<user_id>', methods=['PATCH'])
def update_user(user_id):
    if user_id in users:
        data = request.json
        # Update user logic...
        users[user_id]['username'] = data['username']
        users[user_id]['password'] = data['password']
        return jsonify({'message': 'User updated successfully'})
    else:
        return jsonify({'message': 'User not found'}), 404

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

# Problem API

@app.route('/problems/<problem_id>', methods=['GET'])
def get_problem(problem_id):
    if problem_id in problems:
        return jsonify(problems[problem_id])
    else:
        return jsonify({'message': 'Problem not found'}), 404

# Submission API

@app.route('/problems/<problem_id>/submissions', methods=['POST'])
def submit_code(problem_id):
    data = request.json
    user_id = data['user_id']
    code = data['code']
    # Submit code logic...
    submission_id = f"submission{len(submissions) + 1}"
    submissions[submission_id] = {
        'submission_id': submission_id,
        'user_id': user_id,
        'problem_id': problem_id,
        'code': code,
        'timestamp': '2022-07-05 09:00:00'
    }
    return jsonify({'message': 'Code submitted successfully'})

@app.route('/submissions/<submission_id>', methods=['GET'])
def get_submission(submission_id):
    if submission_id in submissions:
        return jsonify(submissions[submission_id])
    else:
        return jsonify({'message': 'Submission not found'}), 404

@app.route('/users/<user_id>/submissions', methods=['GET'])
def get_user_submissions(user_id):
    user_submissions = [submission for submission in submissions.values() if submission['user_id'] == user_id]
    return jsonify(user_submissions)

# Comment API

@app.route('/problems/<problem_id>/comments', methods=['POST'])
def create_comment(problem_id):
    data = request.json
    post_id = problem_id
    user_id = data['user_id']
    text = data['text']
    # Create comment logic...
    comment_id = f"comment{len(comments) + 1}"
    comments[comment_id] = {
        'comment_id': comment_id,
        'post_id': post_id,
        'user_id': user_id,
        'text': text,
        'timestamp': '2022-07-05 10:00:00'
    }
    return jsonify({'message': 'Comment created successfully'})

@app.route('/problems/<problem_id>/comments', methods=['GET'])
def get_problem_comments(problem_id):
    problem_comments = [comment for comment in comments.values() if comment['post_id'] == problem_id]
    return jsonify(problem_comments)

# Additional API endpoints can be implemented similarly

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

class Leetcode:
    def __init__(self):
        self.problems = []

    def add_problem(self, problem):
        self.problems.append(problem)

    def get_problems(self):
        return self.problems

class Problem:
    def __init__(self, title, difficulty, category):
        self.title = title
        self.difficulty = difficulty
        self.category = category

leetcode = Leetcode()
leetcode.add_problem(Problem("Two Sum", "Easy", "Array"))
leetcode.add_problem(Problem("Add Two Numbers", "Medium", "Linked List"))

problems = leetcode.get_problems()
for problem in problems:
    print(f"Title: {problem.title}, Difficulty: {problem.difficulty}, Category: {problem.category}")

class Problem:
    def __init__(self, title, difficulty, category):
        self.title = title
        self.difficulty = difficulty
        self.category = category
        self.solutions = []
        self.discussions = []

    def add_solution(self, solution):
        self.solutions.append(solution)

    def add_discussion(self, discussion):
        self.discussions.append(discussion)

problem = Problem("Two Sum", "Easy", "Array")
problem.add_solution("Solution 1: Use a hash map")
problem.add_solution("Solution 2: Use two pointers")

problem.add_discussion("Discussion 1: Time complexity analysis")
problem.add_discussion("Discussion 2: Optimization techniques")

print(f"Problem: {problem.title}")
print("Solutions:")
for solution in problem.solutions:
    print(solution)
print("Discussions:")
for discussion in problem.discussions:
    print(discussion)

class User:
    def __init__(self, name, email):
        self.name = name
        self.email = email
        self.progress = 0
        self.submissions = []

    def update_progress(self, new_progress):
        self.progress = new_progress

    def add_submission(self, submission):
        self.submissions.append(submission)

user = User("John Doe", "[email protected]")
user.update_progress(75)
user.add_submission("Solution for Problem 1")

print(f"Name: {user.name}, Email: {user.email}")
print(f"Progress: {user.progress}%")
print("Submissions:")
for submission in user.submissions:
    print(submission)

class Leetcode:
    def __init__(self):
        self.interview_prep = []

    def add_interview_prep(self, prep_item):
        self.interview_prep.append(prep_item)

    def get_interview_prep(self):
        return self.interview_prep

leetcode = Leetcode()
leetcode.add_interview_prep("Mock interview with a coding challenge")
leetcode.add_interview_prep("Company-specific interview questions")

interview_prep = leetcode.get_interview_prep()
print("Interview Preparation:")
for prep_item in interview_prep:
    print(prep_item)

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

class Course:
    def __init__(self, course_id, name, description, duration):
        self.course_id = course_id
        self.name = name
        self.description = description
        self.duration = duration
        # Other course attributes

class Enrollment:
    def __init__(self, enrollment_id, user_id, course_id, enrollment_date, progress):
        self.enrollment_id = enrollment_id
        self.user_id = user_id
        self.course_id = course_id
        self.enrollment_date = enrollment_date
        self.progress = progress
        # Other enrollment attributes

class Lesson:
    def __init__(self, lesson_id, course_id, title, content):
        self.lesson_id = lesson_id
        self.course_id = course_id
        self.title = title
        self.content = content
        # Other lesson attributes

class Quiz:
    def __init__(self, quiz_id, course_id, title, questions):
        self.quiz_id = quiz_id
        self.course_id = course_id
        self.title = title
        self.questions = questions
        # Other quiz attributes

class Project:
    def __init__(self, project_id, course_id, title, description):
        self.project_id = project_id
        self.course_id = course_id
        self.title = title
        self.description = description
        # Other project attributes

class Udacity:
    def __init__(self):
        self.users = {}
        self.courses = []
        # Other class attributes and initialization logic

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

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

    def create_course(self, course_id, name, description, duration):
        course = Course(course_id, name, description, duration)
        self.courses.append(course)
        # Additional logic for course creation

    # Additional methods for handling enrollments, lessons, quizzes, projects, etc.

User API:
Endpoint: /users/register

Method: POST
Description: Registers a new user.
Request Body:

{
    "name": "John Doe",
    "email": "[email protected]",
    "password": "password123"
}
Response:

{
    "user_id": "123456789",
    "message": "User registered successfully."
}
Endpoint: /users/login

Method: POST
Description: Authenticates a user and generates an access token.
Request Body:

{
    "email": "[email protected]",
    "password": "password123"
}
Response:

{
    "access_token": "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VyX2lkIjoiMTIzNDU2Nzg5IiwiaWF0IjoxNjI2NzIxNTI2LCJleHAiOjE2MjY3MjUxMjZ9.oUDlms1SG2lGtStYVLFTnNCDZR8F5C2GzFv1e8-5zrM",
    "message": "User logged in successfully."
}
Course API:
Endpoint: /courses

Method: GET
Description: Retrieves a list of available courses.
Response:

{
    "courses": [
        {
            "course_id": "1",
            "name": "Introduction to Python",
            "description": "Learn the basics of Python programming.",
            "duration": "6 weeks"
        },
        {
            "course_id": "2",
            "name": "Data Science Fundamentals",
            "description": "Explore the foundations of data science.",
            "duration": "8 weeks"
        }
    ]
}
Endpoint: /courses/{course_id}

Method: GET
Description: Retrieves details of a specific course.
Response:

{
    "course_id": "1",
    "name": "Introduction to Python",
    "description": "Learn the basics of Python programming.",
    "duration": "6 weeks",
    "lessons": [
        {
            "lesson_id": "1",
            "title": "Python Variables and Data Types",
            "content": "Introduction to variables and different data types in Python."
        },
        {
            "lesson_id": "2",
            "title": "Python Control Flow",
            "content": "Learn about if-else statements and loops in Python."
        }
    ]
}
Enrollment API:
Endpoint: /enrollments

Method: POST
Description: Enrolls a user in a specific course.
Request Body:

{
    "user_id": "123456789",
    "course_id": "1"
}
Response:

{
    "enrollment_id": "987654321",
    "message": "User enrolled in the course successfully."
}
Endpoint: /enrollments/{enrollment_id}

Method: GET
Description: Retrieves details of a specific enrollment.
Response:

{
    "enrollment_id": "987654321",
    "user_id": "123456789",
    "course_id": "1",
    "enrollment_date": "2023-07-07",
    "progress": 0.5
}

class Course:
    def __init__(self, course_id, name, description, duration):
        self.course_id = course_id
        self.name = name
        self.description = description
        self.duration = duration
        self.lessons = []
        self.quizzes = []
        self.projects = []

    def add_lesson(self, lesson):
        self.lessons.append(lesson)

    def add_quiz(self, quiz):
        self.quizzes.append(quiz)

    def add_project(self, project):
        self.projects.append(project)

class Lesson:
    def __init__(self, lesson_id, title, content):
        self.lesson_id = lesson_id
        self.title = title
        self.content = content

class Quiz:
    def __init__(self, quiz_id, title, questions):
        self.quiz_id = quiz_id
        self.title = title
        self.questions = questions

class Project:
    def __init__(self, project_id, title, description):
        self.project_id = project_id
        self.title = title
        self.description = description

# Creating a sample course
course = Course("1", "Introduction to Python", "Learn the basics of Python programming.", "6 weeks")

# Adding lessons, quizzes, and projects to the course
lesson1 = Lesson("1", "Python Variables and Data Types", "Introduction to variables and different data types in Python.")
lesson2 = Lesson("2", "Python Control Flow", "Learn about if-else statements and loops in Python.")
course.add_lesson(lesson1)
course.add_lesson(lesson2)

quiz1 = Quiz("1", "Python Variables Quiz", ["Question 1", "Question 2", "Question 3"])
course.add_quiz(quiz1)

project1 = Project("1", "Data Analysis Project", "Analyze a dataset using Python.")
course.add_project(project1)

# Printing the course catalog
print(f"Course ID: {course.course_id}")
print(f"Course Name: {course.name}")
print(f"Description: {course.description}")
print(f"Duration: {course.duration}")

print("Lessons:")
for lesson in course.lessons:
    print(f"- Lesson ID: {lesson.lesson_id}")
    print(f"  Title: {lesson.title}")
    print(f"  Content: {lesson.content}")

print("Quizzes:")
for quiz in course.quizzes:
    print(f"- Quiz ID: {quiz.quiz_id}")
    print(f"  Title: {quiz.title}")
    print(f"  Questions: {quiz.questions}")

print("Projects:")
for project in course.projects:
    print(f"- Project ID: {project.project_id}")
    print(f"  Title: {project.title}")
    print(f"  Description: {project.description}")

class User:
    def __init__(self, user_id, name):
        self.user_id = user_id
        self.name = name
        self.learning_goals = []

    def set_learning_goals(self, goals):
        self.learning_goals = goals

    def get_personalized_recommendations(self):
        # Logic to generate personalized course recommendations based on learning goals
        recommendations = []
        # Add logic to generate personalized course recommendations based on user's learning goals
        return recommendations

# Creating a sample user
user = User("123", "John Doe")

# Setting learning goals for the user
learning_goals = ["Python programming", "Data science"]
user.set_learning_goals(learning_goals)

# Getting personalized course recommendations for the user
recommendations = user.get_personalized_recommendations()

# Printing the personalized recommendations
print(f"Personalized Course Recommendations for {user.name}:")
for recommendation in recommendations:
    print(f"- {recommendation}")

class Project:
    def __init__(self, project_id, title, description):
        self.project_id = project_id
        self.title = title
        self.description = description

    def submit_project(self, project_submission):
        # Logic to process the submitted project and provide feedback
        feedback = ""
        # Add logic to process the project submission and generate feedback
        return feedback

# Creating a sample project
project = Project("1", "Data Analysis Project", "Analyze a dataset using Python")

# Simulating project submission
project_submission = "Code and analysis report"

# Submitting the project and receiving feedback
feedback = project.submit_project(project_submission)

# Printing the feedback
print(f"Project Feedback:\n{feedback}")

class Mentor:
    def __init__(self, mentor_id, name):
        self.mentor_id = mentor_id
        self.name = name

    def provide_feedback(self, project_submission):
        # Logic to provide feedback on the project submission
        feedback = ""
        # Add logic to provide feedback on the project submission
        return feedback

# Creating a sample mentor
mentor = Mentor("456", "Jane Smith")

# Simulating a project submission
project_submission = "Code and analysis report"

# Receiving feedback from the mentor
feedback = mentor.provide_feedback(project_submission)

# Printing the feedback
print(f"Mentor Feedback:\n{feedback}")

class Nanodegree:
    def __init__(self, nanodegree_id, name, description, courses):
        self.nanodegree_id = nanodegree_id
        self.name = name
        self.description = description
        self.courses = courses

# Creating a sample nanodegree
course1 = Course("1", "Introduction to Python", "Learn the basics of Python programming.", "6 weeks")
course2 = Course("2", "Data Science Fundamentals", "Explore the foundations of data science.", "8 weeks")

nanodegree = Nanodegree("ND1", "Python Developer Nanodegree", "Become a Python developer.", [course1, course2])

# Printing the nanodegree details
print(f"Nanodegree ID: {nanodegree.nanodegree_id}")
print(f"Nanodegree Name: {nanodegree.name}")
print(f"Description: {nanodegree.description}")

print("Courses:")
for course in nanodegree.courses:
    print(f"- Course ID: {course.course_id}")
    print(f"  Name: {course.name}")
    print(f"  Description: {course.description}")
    print(f"  Duration: {course.duration}")

# User Service
users = []

def register_user(username, email, password):
    user = {
        'user_id': len(users) + 1,
        'username': username,
        'email': email,
        'password': password
    }
    users.append(user)

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

def update_profile(user_id, profile_data):
    for user in users:
        if user['user_id'] == user_id:
            user['profile'] = profile_data
            break

def get_user_profile(user_id):
    for user in users:
        if user['user_id'] == user_id:
            return user
    return None

# Product Service
products = []

def add_product(name, description, price, supplier_id):
    product = {
        'product_id': len(products) + 1,
        'name': name,
        'description': description,
        'price': price,
        'supplier_id': supplier_id
    }
    products.append(product)

def get_product_details(product_id):
    for product in products:
        if product['product_id'] == product_id:
            return product
    return None

def search_products(keyword):
    matching_products = []
    for product in products:
        if keyword.lower() in product['name'].lower() or keyword.lower() in product['description'].lower():
            matching_products.append(product)
    return matching_products

# Order Service
orders = []

def place_order(user_id, product_id, quantity):
    order = {
        'order_id': len(orders) + 1,
        'user_id': user_id,
        'product_id': product_id,
        'quantity': quantity,
        'total_price': 0,  # Placeholder for the total price calculation
        'order_date': datetime.now()
    }
    orders.append(order)

def calculate_total_price(order):
    # Logic to calculate the total price based on the product price and quantity
    product = get_product_details(order['product_id'])
    if product:
        order['total_price'] = product['price'] * order['quantity']

def get_user_orders(user_id):
    user_orders = []
    for order in orders:
        if order['user_id'] == user_id:
            user_orders.append(order)
    return user_orders

# Payment Service
payments = []

def process_payment(order_id, payment_method, payment_amount):
    order = get_order_details(order_id)
    if order:
        payment = {
            'payment_id': len(payments) + 1,
            'order_id': order_id,
            'payment_method': payment_method,
            'payment_amount': payment_amount,
            'payment_date': datetime.now()
        }
        payments.append(payment)
        return True
    return False

def get_order_details(order_id):
    for order in orders:
        if order['order_id'] == order_id:
            return order
    return None

# Review Service
reviews = []

def leave_review(product_id, user_id, rating, comment):
    review = {
        'review_id': len(reviews) + 1,
        'product_id': product_id,
        'user_id': user_id,
        'rating': rating,
        'comment': comment,
        'review_date': datetime.now()
    }
    reviews.append(review)

def get_product_reviews(product_id):
    product_reviews = []
    for review in reviews:
        if review['product_id'] == product_id:
            product_reviews.append(review)
    return product_reviews

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

app = Flask(__name__)

# Sample data for demonstration purposes
users = []
products = []
orders = []
payments = []
reviews = []

# User Class
class User:
    def __init__(self, userId, username, password, email):
        self.userId = userId
        self.username = username
        self.password = password
        self.email = email

# Product Class
class Product:
    def __init__(self, productId, name, description, price, supplierId):
        self.productId = productId
        self.name = name
        self.description = description
        self.price = price
        self.supplierId = supplierId

# Order Class
class Order:
    def __init__(self, orderId, userId, productId, quantity, totalPrice, orderDate):
        self.orderId = orderId
        self.userId = userId
        self.productId = productId
        self.quantity = quantity
        self.totalPrice = totalPrice
        self.orderDate = orderDate

# Payment Class
class Payment:
    def __init__(self, paymentId, orderId, paymentMethod, paymentAmount, paymentDate):
        self.paymentId = paymentId
        self.orderId = orderId
        self.paymentMethod = paymentMethod
        self.paymentAmount = paymentAmount
        self.paymentDate = paymentDate

# Review Class
class Review:
    def __init__(self, reviewId, productId, userId, rating, comment, reviewDate):
        self.reviewId = reviewId
        self.productId = productId
        self.userId = userId
        self.rating = rating
        self.comment = comment
        self.reviewDate = reviewDate

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

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

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

@app.route('/products/<productId>', methods=['GET'])
def get_product(productId):
    for product in products:
        if product.productId == productId:
            return jsonify({'productId': product.productId, 'name': product.name, 'description': product.description, 'price': product.price})
    return jsonify({'message': 'Product not found'}), 404

# Order Management API
@app.route('/orders', methods=['POST'])
def place_order():
    data = request.get_json()
    user = get_user_by_id(data['userId'])
    product = get_product_by_id(data['productId'])
    if user and product:
        orderId = str(len(orders) + 1)
        totalPrice = product.price * data['quantity']
        order = Order(orderId, user.userId, product.productId, data['quantity'], totalPrice, datetime.now().strftime("%Y-%m-%d %H:%M:%S"))
        orders.append(order)
        return jsonify({'message': 'Order placed successfully'})
    return jsonify({'message': 'User or product not found'}), 404

@app.route('/orders/<orderId>', methods=['GET'])
def get_order(orderId):
    for order in orders:
        if order.orderId == orderId:
            return jsonify({'orderId': order.orderId, 'userId': order.userId, 'productId': order.productId, 'quantity': order.quantity, 'totalPrice': order.totalPrice, 'orderDate': order.orderDate})
    return jsonify({'message': 'Order not found'}), 404

# Payment API
@app.route('/payments', methods=['POST'])
def process_payment():
    data = request.get_json()
    order = get_order_by_id(data['orderId'])
    if order:
        paymentId = str(len(payments) + 1)
        payment = Payment(paymentId, order.orderId, data['paymentMethod'], data['paymentAmount'], datetime.now().strftime("%Y-%m-%d %H:%M:%S"))
        payments.append(payment)
        return jsonify({'message': 'Payment processed successfully'})
    return jsonify({'message': 'Order not found'}), 404

@app.route('/payments/<paymentId>', methods=['GET'])
def get_payment(paymentId):
    for payment in payments:
        if payment.paymentId == paymentId:
            return jsonify({'paymentId': payment.paymentId, 'orderId': payment.orderId, 'paymentMethod': payment.paymentMethod, 'paymentAmount': payment.paymentAmount, 'paymentDate': payment.paymentDate})
    return jsonify({'message': 'Payment not found'}), 404

# Review API
@app.route('/reviews', methods=['POST'])
def leave_review():
    data = request.get_json()
    user = get_user_by_id(data['userId'])
    product = get_product_by_id(data['productId'])
    if user and product:
        reviewId = str(len(reviews) + 1)
        review = Review(reviewId, product.productId, user.userId, data['rating'], data['comment'], datetime.now().strftime("%Y-%m-%d %H:%M:%S"))
        reviews.append(review)
        return jsonify({'message': 'Review added successfully'})
    return jsonify({'message': 'User or product not found'}), 404

@app.route('/reviews/<reviewId>', methods=['GET'])
def get_review(reviewId):
    for review in reviews:
        if review.reviewId == reviewId:
            return jsonify({'reviewId': review.reviewId)

User Management API:
Endpoint: /users
POST: Create a new user.
PATCH: Update user information.
Endpoint: /users/{userId}
GET: Retrieve user information.
DELETE: Delete a user.

Product Catalog API:
Endpoint: /products
POST: Add a new product to the catalog.
GET: Get all products or search products by keyword.
Endpoint: /products/{productId}
GET: Get product details by product ID.

Order Management API:
Endpoint: /orders
POST: Place a new order.
GET: Get all orders or retrieve orders by user ID.
Endpoint: /orders/{orderId}
GET: Get order details by order ID.

Payment API:
Endpoint: /payments
POST: Process a new payment.
Endpoint: /payments/{paymentId}
GET: Get payment details by payment ID.

Review API:
Endpoint: /reviews
POST: Leave a review for a product.
Endpoint: /reviews/{reviewId}
GET: Get review details by review ID.

User-related Endpoints:

/users/register (POST): Register a new user.
/users/login (POST): Authenticate and log in a user.
/users/profile (GET): Retrieve user profile information.
/users/orders (GET): Get a list of orders placed by the user.
/users/orders/{order_id} (GET): Get details of a specific order.

Product-related Endpoints:

/products (GET): Get a list of available products.
/products/{product_id} (GET): Get details of a specific product.
/products/{product_id}/add-to-cart (POST): Add a product to the users cart.
/products/{product_id}/remove-from-cart (POST): Remove a product from the users cart.

Order-related Endpoints:

/orders (POST): Place a new order.
/orders/{order_id} (GET): Get details of a specific order.
/orders/{order_id}/cancel (POST): Cancel a specific order.
/orders/{order_id}/track (GET): Get tracking information for a specific order.
Supplier-related Endpoints:

/suppliers (GET): Get a list of registered suppliers.
/suppliers/{supplier_id}/products (GET): Get products offered by a specific supplier.
/suppliers/{supplier_id}/products/{product_id} (GET): Get details of a specific product offered by a supplier.

from flask import Flask, jsonify, request

app = Flask(__name__)

# User-related Endpoints
@app.route('/users/register', methods=['POST'])
def register_user():
    # Implementation details for user registration
    return jsonify({'message': 'User registered successfully'})

@app.route('/users/login', methods=['POST'])
def login_user():
    # Implementation details for user login
    return jsonify({'message': 'User logged in successfully'})

@app.route('/users/profile', methods=['GET'])
def get_user_profile():
    # Implementation details for retrieving user profile
    return jsonify({'user_id': '123', 'name': 'John Doe', 'email': '[email protected]'})

@app.route('/users/orders', methods=['GET'])
def get_user_orders():
    # Implementation details for retrieving user orders
    return jsonify({'orders': [{'order_id': '1', 'status': 'completed'}, {'order_id': '2', 'status': 'pending'}]})

@app.route('/users/orders/<order_id>', methods=['GET'])
def get_order_details(order_id):
    # Implementation details for retrieving order details
    return jsonify({'order_id': order_id, 'status': 'completed', 'total_amount': 100.50})

# Product-related Endpoints
@app.route('/products', methods=['GET'])
def get_products():
    # Implementation details for retrieving products
    return jsonify({'products': [{'product_id': '1', 'name': 'Product 1', 'price': 10.99}, {'product_id': '2', 'name': 'Product 2', 'price': 19.99}]})

@app.route('/products/<product_id>', methods=['GET'])
def get_product_details(product_id):
    # Implementation details for retrieving product details
    return jsonify({'product_id': product_id, 'name': 'Product Name', 'price': 10.99})

@app.route('/products/<product_id>/add-to-cart', methods=['POST'])
def add_to_cart(product_id):
    # Implementation details for adding a product to the cart
    return jsonify({'message': f'Product {product_id} added to cart'})

@app.route('/products/<product_id>/remove-from-cart', methods=['POST'])
def remove_from_cart(product_id):
    # Implementation details for removing a product from the cart
    return jsonify({'message': f'Product {product_id} removed from cart'})

# Order-related Endpoints
@app.route('/orders', methods=['POST'])
def place_order():
    # Implementation details for placing an order
    return jsonify({'message': 'Order placed successfully'})

@app.route('/orders/<order_id>', methods=['GET'])
def get_order_details(order_id):
    # Implementation details for retrieving order details
    return jsonify({'order_id': order_id, 'status': 'completed', 'total_amount': 100.50})

@app.route('/orders/<order_id>/cancel', methods=['POST'])
def cancel_order(order_id):
    # Implementation details for canceling an order
    return jsonify({'message': f'Order {order_id} canceled'})

@app.route('/orders/<order_id>/track', methods=['GET'])
def track_order(order_id):
    # Implementation details for tracking an order
    return jsonify({'order_id': order_id, 'status': 'in-transit'})

# Supplier-related Endpoints
@app.route('/suppliers', methods=['GET'])
def get_suppliers():
    # Implementation details for retrieving suppliers
    return jsonify({'suppliers': [{'supplier_id': '1', 'name': 'Supplier 1'}, {'supplier_id': '2', 'name': 'Supplier 2'}]})

@app.route('/suppliers/<supplier_id>/products', methods=['GET'])
def get_supplier_products(supplier_id):
    # Implementation details for retrieving supplier products
    return jsonify({'products': [{'product_id': '1', 'name': 'Product 1'}, {'product_id': '2', 'name': 'Product 2'}]})

@app.route('/suppliers/<supplier_id>/products/<product_id>', methods=['GET'])
def get_supplier_product_details(supplier_id, product_id):
    # Implementation details for retrieving supplier product details
    return jsonify({'product_id': product_id, 'name': 'Product Name'})

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

# User Management
users = []

def sign_up(name, email, password):
    user = {
        'user_id': len(users) + 1,
        'name': name,
        'email': email,
        'password': password,
        'orders': [],
        'profile': {}
    }
    users.append(user)

def create_profile(user_id, profile_data):
    for user in users:
        if user['user_id'] == user_id:
            user['profile'] = profile_data
            break

def manage_orders(user_id):
    for user in users:
        if user['user_id'] == user_id:
            orders = user['orders']
            # Perform order management operations
            print(f"Managing orders for user with ID {user_id}")
            print(f"Total orders: {len(orders)}")
            break

def track_shipment(order_id):
    # Perform shipment tracking logic
    print(f"Tracking shipment for order with ID {order_id}")

def access_customer_support(user_id):
    # Perform customer support operations
    print(f"Accessing customer support for user with ID {user_id}")

# Product Catalog
products = []

def browse_products():
    # Return all products
    return products

def search_products(keyword):
    # Perform product search based on keyword
    print(f"Searching products for keyword: {keyword}")

def view_product_details(product_id):
    for product in products:
        if product['product_id'] == product_id:
            return product
    return None

def add_to_catalog(user_id, product_id):
    for user in users:
        if user['user_id'] == user_id:
            user.setdefault('catalog', []).append(product_id)
            break

# Social Sharing
def share_product_catalog(user_id, social_media):
    for user in users:
        if user['user_id'] == user_id:
            catalog = user.get('catalog', [])
            # Perform sharing on social media logic
            print(f"Sharing catalog for user with ID {user_id} on {social_media}")
            break

def interact_with_customers():
    # Perform interactions with customers logic
    print("Interacting with customers")

def drive_sales():
    # Perform sales-driving strategies logic
    print("Driving sales")

# Ordering and Payment
def place_order(user_id, order_data):
    for user in users:
        if user['user_id'] == user_id:
            user.setdefault('orders', []).append(order_data)
            break

def make_payment(order_id, payment_data):
    # Perform payment processing logic
    print(f"Making payment for order with ID {order_id}")

def process_transaction(transaction_data):
    # Perform transaction processing logic
    print("Processing transaction")

# Inventory Management
suppliers = []

def manage_inventory(supplier_id):
    for supplier in suppliers:
        if supplier['supplier_id'] == supplier_id:
            inventory = supplier.setdefault('inventory', [])
            # Perform inventory management operations
            print(f"Managing inventory for supplier with ID {supplier_id}")
            break

def update_stock_availability(product_id, stock_available):
    # Update stock availability for a specific product
    print(f"Updating stock availability for product with ID {product_id} to {stock_available}")

def receive_low_stock_notifications(supplier_id):
    # Receive low stock notifications for a supplier
    print(f"Receiving low stock notifications for supplier with ID {supplier_id}")

# Payment Service
def initiate_payment(user_id, amount):
    # Process payment initiation logic
    # ...
    payment_id = generate_payment_id()
    timestamp = get_current_timestamp()
    # Save payment details in the database
    save_payment(payment_id, user_id, amount, timestamp)
    return payment_id

def verify_transaction(payment_id):
    # Process transaction verification logic
    # ...
    transaction_id = generate_transaction_id()
    timestamp = get_current_timestamp()
    # Update transaction status in the database
    update_transaction_status(transaction_id, payment_id, 'verified', timestamp)
    return transaction_id

# Transaction Service
def record_transaction(user_id, payment_id, status):
    # Process transaction recording logic
    # ...
    transaction_id = generate_transaction_id()
    timestamp = get_current_timestamp()
    # Save transaction details in the database
    save_transaction(transaction_id, user_id, payment_id, status, timestamp)
    return transaction_id

def get_transaction_history(user_id):
    # Retrieve transaction history for a user from the database
    # ...
    transaction_history = fetch_transaction_history(user_id)
    return transaction_history

# User Service
def register_user(username, email, password):
    # Process user registration logic
    # ...
    user_id = generate_user_id()
    # Save user details in the database
    save_user(user_id, username, email, password)
    return user_id

def authenticate_user(username, password):
    # Process user authentication logic
    # ...
    user_id = get_user_id(username)
    return user_id

# Notification Service
def send_notification(user_id, message):
    # Process notification sending logic
    # ...
    notification_id = generate_notification_id()
    timestamp = get_current_timestamp()
    # Save notification details in the database
    save_notification(notification_id, user_id, message, timestamp)
    return notification_id

Payment Service:
initiate_payment(user_id, amount): Initiates a payment transaction and saves the payment details in the database.
verify_transaction(payment_id): Verifies a payment transaction and updates the transaction status in the database.

Transaction Service:
record_transaction(user_id, payment_id, status): Records a transaction in the database with the provided user ID, payment ID, and status.
get_transaction_history(user_id): Retrieves the transaction history for a user from the database.

User Service:
register_user(username, email, password): Registers a new user and saves their details in the database.
authenticate_user(username, password): Authenticates a user based on the provided username and password.

Notification Service:
send_notification(user_id, message): Sends a notification to a user and saves the notification details in the database.

class User:
    def __init__(self, user_id, username, password):
        self.user_id = user_id
        self.username = username
        self.password = password
        # Additional attributes for user
    
class Payment:
    def __init__(self, payment_id, user_id, amount):
        self.payment_id = payment_id
        self.user_id = user_id
        self.amount = amount
        # Additional attributes for payment

class Transaction:
    def __init__(self, transaction_id, user_id, payment_id, status):
        self.transaction_id = transaction_id
        self.user_id = user_id
        self.payment_id = payment_id
        self.status = status
        # Additional attributes for transaction

class Alipay:
    def __init__(self):
        self.users = {}
        self.payments = {}
        self.transactions = {}
        # Additional attributes for Alipay
    
    def add_user(self, user):
        self.users[user.user_id] = user
    
    def get_user_by_id(self, user_id):
        return self.users.get(user_id)
    
    def create_payment(self, user_id, amount):
        payment_id = generate_payment_id()
        payment = Payment(payment_id, user_id, amount)
        self.payments[payment_id] = payment
        return payment_id
    
    def verify_transaction(self, payment_id):
        transaction_id = generate_transaction_id()
        payment = self.payments.get(payment_id)
        if payment:
            transaction = Transaction(transaction_id, payment.user_id, payment_id, 'verified')
            self.transactions[transaction_id] = transaction
            return transaction_id
        else:
            return None

    # Additional methods for handling other functionalities

User Registration API:
Endpoint: POST /api/users/register
Description: Allows users to register an account on Alipay.
Request Body:

{
  "username": "example_username",
  "password": "example_password",
  "email": "[email protected]",
  "phone": "1234567890"
}
Response:
200 OK: User registration successful.
400 Bad Request: Invalid request data or user already exists.

User Authentication API:
Endpoint: POST /api/users/login
Description: Authenticates a user and generates an access token.
Request Body:

{
  "username": "example_username",
  "password": "example_password"
}
Response:
200 OK: User authenticated. Response includes access token.
401 Unauthorized: Invalid credentials.

Payment API:
Endpoint: POST /api/payments
Description: Allows users to initiate a payment transaction.
Request Body:
{
  "amount": 100.00,
  "recipient": "merchant_id",
  "description": "Payment for purchase"
}
Headers:
Authorization: Bearer <access_token>
Response:
200 OK: Payment successful. Response includes transaction ID.
401 Unauthorized: Invalid or expired access token.
404 Not Found: Invalid recipient ID.

Transaction History API:
Endpoint: GET /api/transactions
Description: Retrieves the transaction history of a user.
Headers:
Authorization: Bearer <access_token>
Response:
200 OK: Returns a list of transaction records.
401 Unauthorized: Invalid or expired access token.

from flask import Flask, request, jsonify

app = Flask(__name__)

# User Registration API
@app.route('/api/users/register', methods=['POST'])
def register_user():
    # Process request and create user
    # ...
    return jsonify({'message': 'User registration successful'})

# User Authentication API
@app.route('/api/users/login', methods=['POST'])
def login_user():
    # Process request and authenticate user
    # ...
    access_token = 'generated_access_token'
    return jsonify({'access_token': access_token})

# Payment API
@app.route('/api/payments', methods=['POST'])
def make_payment():
    # Authenticate user with access token
    # ...
    if authenticated:
        # Process payment request
        # ...
        transaction_id = 'generated_transaction_id'
        return jsonify({'transaction_id': transaction_id})
    else:
        return jsonify({'message': 'Unauthorized'}), 401

# Transaction History API
@app.route('/api/transactions', methods=['GET'])
def get_transaction_history():
    # Authenticate user with access token
    # ...
    if authenticated:
        # Retrieve transaction history
        # ...
        transactions = [{'id': 1, 'amount': 100.00, 'description': 'Payment for purchase'}, ...]
        return jsonify({'transactions': transactions})
    else:
        return jsonify({'message': 'Unauthorized'}), 401

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

# 2.1. Mobile Payments
def make_mobile_payment(amount, recipient):
    # Process mobile payment
    if amount > 0:
        # Perform payment processing logic
        # ...
        return True
    else:
        return False

# 2.2. Money Transfer
def transfer_money(amount, recipient):
    # Process money transfer
    if amount > 0:
        # Perform money transfer logic
        # ...
        return True
    else:
        return False

# 2.3. Bill Payments
def pay_bill(bill_amount, bill_type):
    # Process bill payment
    if bill_amount > 0:
        # Perform bill payment logic
        # ...
        return True
    else:
        return False

# 2.4. Wealth Management
class WealthManagement:
    def __init__(self):
        self.investments = []

    def add_investment(self, investment):
        # Add investment to portfolio
        if investment not in self.investments:
            self.investments.append(investment)
            return True
        else:
            return False

    def remove_investment(self, investment):
        # Remove investment from portfolio
        if investment in self.investments:
            self.investments.remove(investment)
            return True
        else:
            return False

# 2.5. QR Code Payments
def scan_qr_code(qr_code):
    # Process QR code payment
    if qr_code:
        # Perform QR code payment logic
        # ...
        return True
    else:
        return False

from flask import Flask, request

app = Flask(__name__)

# Alipay instance for handling API requests
alipay = Alipay()

# Endpoint for user registration
@app.route("/users", methods=["POST"])
def create_user():
    data = request.get_json()
    user_id = generate_user_id()
    user = User(user_id, data["username"], data["password"])
    alipay.add_user(user)
    return {"message": "User created successfully"}, 201

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

# Endpoint for initiating a payment transaction
@app.route("/payments", methods=["POST"])
def create_payment():
    data = request.get_json()
    user_id = data["user_id"]
    amount = data["amount"]
    payment_id = alipay.create_payment(user_id, amount)
    if payment_id:
        return {"payment_id": payment_id}, 200
    else:
        return {"message": "User not found"}, 404

# Endpoint for verifying a payment transaction
@app.route("/payments/<payment_id>/verify", methods=["POST"])
def verify_payment(payment_id):
    transaction_id = alipay.verify_transaction(payment_id)
    if transaction_id:
        return {"transaction_id": transaction_id}, 200
    else:
        return {"message": "Payment not found"}, 404

# Endpoint for retrieving transaction history
@app.route("/users/<user_id>/transactions", methods=["GET"])
def get_transaction_history(user_id):
    # Retrieve transaction history for the user
    transaction_history = alipay.get_transaction_history(user_id)
    if transaction_history:
        return {"transaction_history": transaction_history}, 200
    else:
        return {"message": "User not found"}, 404

# Endpoint for retrieving transaction details
@app.route("/transactions/<transaction_id>", methods=["GET"])
def get_transaction(transaction_id):
    # Retrieve transaction details by transaction ID
    transaction = alipay.get_transaction_by_id(transaction_id)
    if transaction:
        return {"transaction_id": transaction.transaction_id, "user_id": transaction.user_id}, 200
    else:
        return {"message": "Transaction not found"}, 404

if __name__ == "__main__":

User Management API:
Endpoint: /users
Methods: POST
Functionality: Creates a new user account with attributes such as Username, Email, and Password.

Meeting Management API:
Endpoint: /meetings
Methods: POST, GET, PUT, DELETE
Functionality:
POST: Creates a new meeting with attributes such as Host ID, Topic, Start Time, and Duration.
GET: Retrieves details of a specific meeting by Meeting ID.
PUT: Updates the details of a specific meeting by Meeting ID.
DELETE: Cancels a specific meeting by Meeting ID.

Participant Management API:
Endpoint: /meetings/{meetingId}/participants
Methods: POST, DELETE
Functionality:
POST: Adds a participant to a specific meeting by Meeting ID.
DELETE: Removes a participant from a specific meeting by Meeting ID.

Recording Management API:
Endpoint: /meetings/{meetingId}/recordings
Methods: POST, GET
Functionality:
POST: Starts recording a specific meeting by Meeting ID.
GET: Retrieves the recordings of a specific meeting by Meeting ID.

from flask import Flask, request, jsonify

app = Flask(__name__)

# User Management API
@app.route('/users', methods=['POST'])
def create_user():
    # Parse request parameters
    username = request.json['username']
    email = request.json['email']
    password = request.json['password']

    # Implementation logic to create a new user
    # ...
    user_id = "user123"

    # Return the user ID
    return jsonify({'user_id': user_id}), 201

# Meeting Management API
@app.route('/meetings', methods=['POST'])
def create_meeting():
    # Parse request parameters
    host_id = request.json['host_id']
    topic = request.json['topic']
    start_time = request.json['start_time']
    duration = request.json['duration']

    # Implementation logic to create a meeting
    # ...
    meeting_id = "123456"

    # Return the meeting ID
    return jsonify({'meeting_id': meeting_id}), 201

@app.route('/meetings/<meeting_id>', methods=['GET'])
def get_meeting(meeting_id):
    # Implementation logic to retrieve the details of a meeting
    # ...
    meeting = {
        'meeting_id': meeting_id,
        'host_id': 'user123',
        'topic': 'Example Meeting',
        'start_time': '2023-07-09 09:00:00',
        'duration': 60
    }

    # Return the meeting details
    return jsonify(meeting)

@app.route('/meetings/<meeting_id>', methods=['PUT'])
def update_meeting(meeting_id):
    # Parse request parameters
    topic = request.json['topic']
    start_time = request.json['start_time']
    duration = request.json['duration']

    # Implementation logic to update the details of a meeting
    # ...
    meeting = {
        'meeting_id': meeting_id,
        'host_id': 'user123',
        'topic': topic,
        'start_time': start_time,
        'duration': duration
    }

    # Return the updated meeting details
    return jsonify(meeting)

@app.route('/meetings/<meeting_id>', methods=['DELETE'])
def cancel_meeting(meeting_id):
    # Implementation logic to cancel a meeting
    # ...

    return jsonify({'message': 'Meeting canceled'})

# Participant Management API
@app.route('/meetings/<meeting_id>/participants', methods=['POST'])
def add_participant(meeting_id):
    # Parse request parameters
    participant_id = request.json['participant_id']
    user_id = request.json['user_id']

    # Implementation logic to add a participant to a meeting
    # ...

    return jsonify({'message': 'Participant added'})

@app.route('/meetings/<meeting_id>/participants', methods=['DELETE'])
def remove_participant(meeting_id):
    # Parse request parameters
    participant_id = request.json['participant_id']
    user_id = request.json['user_id']

    # Implementation logic to remove a participant from a meeting
    # ...

    return jsonify({'message': 'Participant removed'})

# Recording Management API
@app.route('/meetings/<meeting_id>/recordings', methods=['POST'])
def start_recording(meeting_id):
    # Implementation logic to start recording a meeting
    # ...
    recording_id = "rec123"

    # Return the recording ID
    return jsonify({'recording_id': recording_id}), 201

@app.route('/meetings/<meeting_id>/recordings', methods=['GET'])
def get_recordings(meeting_id):
    # Implementation logic to retrieve the recordings of a meeting
    # ...
    recordings = [
        {
            'recording_id': 'rec123',
            'meeting_id': meeting_id,
            'recording_url': 'https://zoom.com/recording1'
        },
        {
            'recording_id': 'rec456',
            'meeting_id': meeting_id,
            'recording_url': 'https://zoom.com/recording2'
        }
    ]

    # Return the recordings
    return jsonify(recordings)

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

Meeting API:
create_meeting(host_id, topic, start_time, duration): Creates a new meeting and returns the meeting ID.
join_meeting(meeting_id, user_id): Allows a user to join a meeting using their user ID and meeting ID.
end_meeting(meeting_id): Ends an ongoing meeting and terminates all participants' connections.

User API:
register_user(name, email, password): Registers a new user with the given name, email, and password.
authenticate_user(email, password): Authenticates a user based on their email and password.

Recording API:
start_recording(meeting_id): Starts recording a meeting and returns the recording ID.
stop_recording(recording_id): Stops recording a meeting based on the recording ID.

Webhooks:
on_meeting_started(callback_url, meeting_id): Sends a notification to the specified callback URL when a meeting starts.
on_chat_message(callback_url, meeting_id): Sends a notification to the specified callback URL when a chat message is received.

from flask import Flask, request, jsonify

app = Flask(__name__)

# Meeting API
@app.route('/meeting/create', methods=['POST'])
def create_meeting():
    # Parse request parameters
    host_id = request.json['host_id']
    topic = request.json['topic']
    start_time = request.json['start_time']
    duration = request.json['duration']

    # Implementation logic to create a meeting
    # ...
    meeting_id = "123456"

    # Return the meeting ID
    return jsonify({'meeting_id': meeting_id})

@app.route('/meeting/join', methods=['POST'])
def join_meeting():
    # Parse request parameters
    meeting_id = request.json['meeting_id']
    user_id = request.json['user_id']

    # Implementation logic to join a meeting
    # ...
    connection_url = "https://zoom.com/connection_url"

    # Return a connection object or URL for the user to join
    return jsonify({'connection_url': connection_url})

@app.route('/meeting/end', methods=['POST'])
def end_meeting():
    # Parse request parameters
    meeting_id = request.json['meeting_id']

    # Implementation logic to end a meeting
    # ...
    # Terminate all participants' connections

    return jsonify({'message': 'Meeting ended'})

# User API
@app.route('/user/register', methods=['POST'])
def register_user():
    # Parse request parameters
    name = request.json['name']
    email = request.json['email']
    password = request.json['password']

    # Implementation logic to register a new user
    # ...
    user_id = "user123"

    # Return the user ID
    return jsonify({'user_id': user_id})

@app.route('/user/authenticate', methods=['POST'])
def authenticate_user():
    # Parse request parameters
    email = request.json['email']
    password = request.json['password']

    # Implementation logic to authenticate a user
    # ...
    # Return a user object or authentication token

    return jsonify({'message': 'User authenticated'})

# Recording API
@app.route('/recording/start', methods=['POST'])
def start_recording():
    # Parse request parameters
    meeting_id = request.json['meeting_id']

    # Implementation logic to start recording a meeting
    # ...
    recording_id = "rec123"

    # Return the recording ID
    return jsonify({'recording_id': recording_id})

@app.route('/recording/stop', methods=['POST'])
def stop_recording():
    # Parse request parameters
    recording_id = request.json['recording_id']

    # Implementation logic to stop recording a meeting
    # ...
    recording_url = "https://zoom.com/recording_url"

    # Return the recording URL or file location
    return jsonify({'recording_url': recording_url})

# Set up webhooks
@app.route('/webhook/meeting-started', methods=['POST'])
def on_meeting_started():
    # Parse request parameters
    callback_url = request.json['callback_url']
    meeting_id = request.json['meeting_id']

    # Implementation logic to register a callback URL for meeting start event
    # ...
    # Send a notification to the specified callback URL

    return jsonify({'message': 'Webhook registered for meeting started event'})

@app.route('/webhook/chat-message', methods=['POST'])
def on_chat_message():
    # Parse request parameters
    callback_url = request.json['callback_url']
    meeting_id = request.json['meeting_id']

    # Implementation logic to register a callback URL for chat message event
    # ...
    # Send a notification to the specified callback URL

    return jsonify({'message': 'Webhook registered for chat message event'})

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

class UserService:
    def register_user(self, username, email, password):
        # Implementation logic to register a new user
        # ...
        user_id = generate_user_id()
        save_user_to_database(user_id, username, email, password)
        return user_id

    def authenticate_user(self, email, password):
        # Implementation logic to authenticate a user
        # ...
        user = get_user_from_database(email)
        if user and user.password == password:
            return user
        return None

    def get_user_profile(self, user_id):
        # Implementation logic to retrieve a user's profile
        # ...
        user = get_user_from_database_by_id(user_id)
        return user

    def update_user_profile(self, user_id, new_data):
        # Implementation logic to update a user's profile
        # ...
        update_user_in_database(user_id, new_data)

    def delete_user(self, user_id):
        # Implementation logic to delete a user
        # ...
        delete_user_from_database(user_id)

class MeetingService:
    def create_meeting(self, host_id, topic, start_time, duration):
        # Implementation logic to create a meeting
        # ...
        meeting_id = generate_meeting_id()
        save_meeting_to_database(meeting_id, host_id, topic, start_time, duration)
        return meeting_id

    def update_meeting(self, meeting_id, new_data):
        # Implementation logic to update a meeting
        # ...
        update_meeting_in_database(meeting_id, new_data)

    def cancel_meeting(self, meeting_id):
        # Implementation logic to cancel a meeting
        # ...
        cancel_meeting_in_database(meeting_id)

    def get_meeting_details(self, meeting_id):
        # Implementation logic to retrieve meeting details
        # ...
        meeting = get_meeting_from_database(meeting_id)
        return meeting

    def get_user_meetings(self, user_id):
        # Implementation logic to retrieve meetings for a user
        # ...
        meetings = get_user_meetings_from_database(user_id)
        return meetings

    def add_participant(self, meeting_id, user_id):
        # Implementation logic to add a participant to a meeting
        # ...
        add_participant_to_meeting_in_database(meeting_id, user_id)

    def remove_participant(self, meeting_id, user_id):
        # Implementation logic to remove a participant from a meeting
        # ...
        remove_participant_from_meeting_in_database(meeting_id, user_id)

class ParticipantService:
    def get_participants(self, meeting_id):
        # Implementation logic to retrieve participants of a meeting
        # ...
        participants = get_participants_from_database(meeting_id)
        return participants

    def get_user_meetings(self, user_id):
        # Implementation logic to retrieve meetings for a user
        # ...
        meetings = get_user_meetings_from_database(user_id)
        return meetings

    def join_meeting(self, meeting_id, user_id):
        # Implementation logic to join a meeting
        # ...
        join_meeting_in_database(meeting_id, user_id)

    def leave_meeting(self, meeting_id, user_id):
        # Implementation logic to leave a meeting
        # ...
        leave_meeting_in_database(meeting_id, user_id)

class RecordingService:
    def start_recording(self, meeting_id):
        # Implementation logic to start recording a meeting
        # ...
        recording_id = generate_recording_id()
        start_recording_in_database(recording_id, meeting_id)
        return recording_id

    def stop_recording(self, recording_id):
        # Implementation logic to stop recording a meeting
        # ...
        stop_recording_in_database(recording_id)

    def get_recording_details(self, recording_id):
        # Implementation logic to retrieve recording details
        # ...
        recording = get_recording_from_database(recording_id)
        return recording

    def get_meeting_recordings(self, meeting_id):
        # Implementation logic to retrieve recordings for a meeting
        # ...
        recordings = get_meeting_recordings_from_database(meeting_id)
        return recordings