1. User

Attributes:

• userID: String
• username: String
• email: String
• password: String
• profilePicture: Image
• bio: String
• followers: List<User>
• following: List<User>

Methods:

• createProfile(): Allows the user to create or edit their profile.
• followUser(user: User): Allows the user to follow another user.
• unfollowUser(user: User): Allows the user to unfollow a user.
• sendMessage(to: User, message: String): Sends a direct message to another user.
• likePost(post: Post): Likes a post.
• commentOnPost(post: Post, comment: String): Comments on a post.
• updateProfile(): Updates profile information.

2. Post

Attributes:

• postID: String
• content: String
• image: Image (Optional)
• video: Video (Optional)
• timestamp: DateTime
• author: User
• likes: List<User>
• comments: List<Comment>

Methods:

• createPost(content: String, image: Image, video: Video): Creates a new post.
• editPost(content: String): Edits the content of a post.
• deletePost(): Deletes the post from the system.
• getComments(): Retrieves all comments on the post.

3. Comment

Attributes:

• commentID: String
• text: String
• author: User
• post: Post
• timestamp: DateTime

Methods:

• addComment(text: String): Adds a new comment to a post.
• deleteComment(): Deletes the comment from the post.

4. Message

Attributes:

• messageID: String
• content: String
• sender: User
• receiver: User
• timestamp: DateTime

Methods:

• sendMessage(content: String): Sends a message from the sender to the receiver.
• receiveMessage(): Allows the receiver to view the message.

5. Notification

Attributes:

• notificationID: String
• user: User
• message: String
• timestamp: DateTime
• status: String (e.g., read, unread)

Methods:

• createNotification(message: String): Creates a new notification for the user.
• markAsRead(): Marks the notification as read.

6. Admin

Attributes:

• adminID: String
• username: String
• email: String

Methods:

• banUser(user: User): Bans a user from the platform.
• deleteUserAccount(user: User): Deletes a user account.
• moderateContent(post: Post): Removes or approves content that violates platform rules.

7. Authentication

Attributes:

• authToken: String
• user: User

Methods:

• login(username: String, password: String): Logs the user in by verifying credentials.
• logout(): Logs the user out of the system.
• verifyCredentials(): Verifies user credentials during login.

Relationships:

• User – Post (1 to many)
  A user can create many posts, but a post is authored by one user.

• Post – Comment (1 to many)
  A post can have many comments, and a comment is associated with a single post.

• User – Message (many to many)
  A user can send many messages to other users, and receive many messages from other users.

• User – Notification (1 to many)
  A user can receive many notifications, but a notification is sent to one user.

• Admin – User (1 to many)
  An admin can manage multiple users, and a user can be managed by one admin.

Diagram Overview:

• User class is the central entity, with relationships to Post, Comment, Message, Notification, and Admin.

• Admin is a special class, inheriting some methods that allow it to manage the users and the content.

• Post and Comment classes hold the content for user interaction, where the Post has multiple Comments.