#46 - javascript

Roadmap/46 - X VS BLUESKY/javascript/pedamoci.js

@@ -0,0 +1,387 @@
+import { randomBytes } from 'node:crypto'
+import readline from 'readline'
+
+const PREVIOUS_USERS_BY_ID = {
+  "a1b2c3d4": {
+    username: "carlos",
+    posts: ["p1k2l3m4", "p0j1k2l3", "p9i0j1k2", "p8h9i0j1", "p7g8h9i0", "p6f7g8h9", "p5e6f7g8", "p4d5e6f7", "p3c4d5e6", "p2b3c4d5", "p1a2b3c4"],
+    followings: ["e5f6g7h8", "i9j0k1l2", "m3n4o5p6", "f8g9h0i1"],
+    likedPosts: ["p22a2b3c", "p33a2b3c", "p44a2b3c", "p55k2l3m", "p56l3m4n"]
+  },
+  "e5f6g7h8": {
+    username: "ana",
+    posts: ["p23b3c4d", "p22a2b3c"],
+    followings: ["a1b2c3d4", "m3n4o5p6", "f8g9h0i1"],
+    likedPosts: ["p1a2b3c4", "p9i0j1k2", "p46c4d5e", "p52i0j1k"]
+  },
+  "i9j0k1l2": {
+    username: "luis",
+    posts: ["p34b3c4d", "p33a2b3c"],
+    followings: ["a1b2c3d4", "e5f6g7h8", "f8g9h0i1"],
+    likedPosts: ["p2b3c4d5", "p23b3c4d", "p55k2l3m", "p1k2l3m4"]
+  },
+  "m3n4o5p6": {
+    username: "sofia",
+    posts: ["p54k2l3m", "p53j1k2l", "p52i0j1k", "p51h9i0j", "p50g8h9i", "p49f7g8h", "p48e6f7g", "p47d5e6f", "p46c4d5e", "p45b3c4d", "p44a2b3c"],
+    followings: ["a1b2c3d4", "e5f6g7h8", "i9j0k1l2", "f8g9h0i1"],
+    likedPosts: ["p1a2b3c4", "p4d5e6f7", "p22a2b3c", "p34b3c4d", "p56l3m4n"]
+  },
+  "f8g9h0i1": {
+    username: "diego",
+    posts: ["p56l3m4n", "p55k2l3m"],
+    followings: ["a1b2c3d4", "m3n4o5p6", "i9j0k1l2"],
+    likedPosts: ["p9i0j1k2", "p44a2b3c", "p52i0j1k", "p1k2l3m4", "p33a2b3c"]
+  },
+}
+
+const PREVIOUS_USERS_BY_USERNAME = {
+  "carlos": "a1b2c3d4",
+  "ana": "e5f6g7h8",
+  "luis": "i9j0k1l2",
+  "sofia": "m3n4o5p6",
+  "diego": "f8g9h0i1"
+}
+
+const PREVIOUS_POSTS = {
+  "p1k2l3m4": { text: "¡Viernes al fin!", date: "2022-10-21T17:00:00Z", userId: "a1b2c3d4", likes: 2 },
+  "p0j1k2l3": { text: "Probando un nuevo restaurante coreano.", date: "2022-10-21T13:00:00Z", userId: "a1b2c3d4", likes: 0 },
+  "p9i0j1k2": { text: "Nueva configuración de escritorio lista.", date: "2022-10-20T11:10:00Z", userId: "a1b2c3d4", likes: 2 },
+  "p8h9i0j1": { text: "Extrañando las vacaciones.", date: "2022-10-19T14:20:00Z", userId: "a1b2c3d4", likes: 0 },
+  "p7g8h9i0": { text: "Cocinando pasta para la cena.", date: "2022-10-18T20:45:00Z", userId: "a1b2c3d4", likes: 0 },
+  "p6f7g8h9": { text: "Viendo una película clásica.", date: "2022-10-17T21:30:00Z", userId: "a1b2c3d4", likes: 0 },
+  "p5e6f7g8": { text: "El clima está increíble hoy.", date: "2022-10-16T12:00:00Z", userId: "a1b2c3d4", likes: 0 },
+  "p4d5e6f7": { text: "Hoy salí a correr 5km.", date: "2022-10-15T07:00:00Z", userId: "a1b2c3d4", likes: 1 },
+  "p3c4d5e6": { text: "¿Alguien recomienda un buen libro?", date: "2022-10-14T18:00:00Z", userId: "a1b2c3d4", likes: 0 },
+  "p2b3c4d5": { text: "Aprendiendo Node.js desde cero.", date: "2022-10-13T10:15:00Z", userId: "a1b2c3d4", likes: 1 },
+  "p1a2b3c4": { text: "Disfrutando de un café por la mañana.", date: "2022-10-12T08:30:00Z", userId: "a1b2c3d4", likes: 2},
+  "p23b3c4d": { text: "Mi gata no me deja trabajar.", date: "2024-01-16T10:00:00Z", userId: "e5f6g7h8", likes: 1 },
+  "p22a2b3c": { text: "El viaje a la montaña fue espectacular.", date: "2024-01-15T09:15:22Z", userId: "e5f6g7h8", likes: 2 },
+  "p34b3c4d": { text: "Terminando mi primer proyecto con React.", date: "2026-03-21T15:30:00Z", userId: "i9j0k1l2", likes: 1 },
+  "p33a2b3c": { text: "La inteligencia artificial es fascinante.", date: "2026-03-20T11:05:44Z", userId: "i9j0k1l2", likes: 2 },
+  "p54k2l3m": { text: "Feliz semana a todos.", date: "2015-05-20T08:00:00Z", userId: "m3n4o5p6", likes: 0 },
+  "p53j1k2l": { text: "Escuchando jazz.", date: "2015-05-19T20:00:00Z", userId: "m3n4o5p6", likes: 0 },
+  "p52i0j1k": { text: "Pintando con acuarelas.", date: "2015-05-18T17:45:00Z", userId: "m3n4o5p6", likes: 2 },
+  "p51h9i0j": { text: "Nuevo lienzo en blanco.", date: "2015-05-17T11:30:00Z", userId: "m3n4o5p6", likes: 0 },
+  "p50g8h9i": { text: "Paz mental.", date: "2015-05-16T14:00:00Z", userId: "m3n4o5p6", likes: 0 },
+  "p49f7g8h": { text: "Mi jardín está floreciendo.", date: "2015-05-15T09:00:00Z", userId: "m3n4o5p6", likes: 0 },
+  "p48e6f7g": { text: "Mirando las estrellas.", date: "2015-05-14T22:00:00Z", userId: "m3n4o5p6", likes: 0 },
+  "p47d5e6f": { text: "El té de jazmín es lo mejor.", date: "2015-05-13T10:10:00Z", userId: "m3n4o5p6", likes: 0 },
+  "p46c4d5e": { text: "Leyendo bajo la lluvia.", date: "2015-05-12T16:20:00Z", userId: "m3n4o5p6", likes: 1 },
+  "p45b3c4d": { text: "Caminata nocturna.", date: "2015-05-11T23:00:00Z", userId: "m3n4o5p6", likes: 0 },
+  "p44a2b3c": { text: "Un pequeño poema para el alma.", date: "2015-05-10T22:45:10Z", userId: "m3n4o5p6", likes: 2 },
+  "p56l3m4n": { text: "La disciplina vence al talento.", date: "2025-02-28T09:30:00Z", userId: "f8g9h0i1", likes: 2 },
+  "p55k2l3m": { text: "Entrenando duro para el maratón.", date: "2025-02-27T08:00:15Z", userId: "f8g9h0i1", likes: 2 }
+}
+
+const rl = readline.createInterface({
+  input: process.stdin,
+  output: process.stdout
+})
+
+const createErrorMsg = msg => {
+  return  `\n****************************************************************\n` +
+          `Error: ${msg}` +
+          `\n****************************************************************\n`
+}
+const createSuccessMsg = msg => {
+  return  `\n----------------------------------------------------------------\n` +
+          `Success: ${msg}` +
+          `\n----------------------------------------------------------------\n`
+}
+const createMenuMsg = () => {
+  return  "--------------------- ACTIONS ----------------------\n" +
+          "| 1. Register user               2. Follow user    |\n" +
+          "| 3. Unfollow user               4. Create post    |\n" +
+          "| 5. Delete post                 6. Like post      |\n" +
+          "| 7. Unlike post                 8. View user feed |\n" +
+          "| 9. View followings feed        10. Exit          |\n" +
+          "----------------------------------------------------"
+}
+
+const createPostMsg = info => {
+  return  `~~~~~~~~~~~~~~~~~~~~~ POST ~~~~~~~~~~~~~~~~~~~~~~\n` + 
+          `${info.text}\n` + 
+          `~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n` + 
+          `Date: ${new Date(info.date).toLocaleString()}                Likes:${info.likes}\n` +
+          `User: ${info.username}                   Post ID: ${info.postId}\n` +
+          `User ID: ${info.userId}\n`
+}
+
+const ask = q => new Promise(r => rl.question(q,r))
+
+class Renderer {
+  static error(msg) {
+    console.error(createErrorMsg(msg))
+  }
+
+  static success(msg) {
+    console.log(createSuccessMsg(msg))
+  }
+
+  static menu() {
+    console.log(createMenuMsg())
+  }
+
+  static post(info) {
+    console.log(createPostMsg(info))
+  }
+}
+
+class Validator {
+  static isValidUsername(username) {
+    if (!username) throw new Error("The username cannot be empty")
+    return username
+  }
+
+  static isValidText(text) {
+    if (!text || text.length > 200) throw new Error("The text is invalid")
+    return text
+  }
+}
+
+class IdHelper {
+  static createId() { return randomBytes(4).toString("hex") }
+
+  static getValidId(usersIds, postsId) {
+    let i = 0
+
+    while (i < 10) {
+      const id = IdHelper.createId()
+      if (!usersIds[id] && !postsId[id]) return id
+      i++
+    }
+
+    throw new Error("The ID could not be created correctly. Please try again later.")
+  }
+}
+
+class FeedHelper {
+  static getPostsId(usersId, users) {
+    const postsId = usersId.flatMap(userId => users[userId].posts)
+    return postsId
+  }
+
+  static getOrderPosts(postsId, posts) {
+    const orderPostsId = [...postsId].sort((postIdOne, postIdTwo) => {
+      if (posts[postIdOne].date > posts[postIdTwo].date) return -1
+      return 1
+    }).slice(0, 10)
+    return orderPostsId
+  }
+}
+
+class InputHelper {
+  static async getExistingUsername(users) {
+    const username = Validator.isValidUsername((await ask("Enter the username: ")).trim())
+    if (!users[username]) throw new Error("The username does not exists")
+    return username
+  }
+
+  static async getExistingPostId(postsId) {
+    const id = (await ask("Enter the post id: ")).trim()
+    if (!postsId[id]) throw new Error("There is no post with this ID")
+    return id
+  }
+}
+
+class User {
+  constructor(username) {
+    this.username = username
+    this.posts = []
+    this.followings = []
+    this.likedPosts = []
+  }
+}
+
+class Post {
+  constructor(userId, text) {
+    this.text = text
+    this.userId = userId
+    this.date = new Date()
+    this.likes = 0
+  }
+}
+
+class UserService {
+  constructor(usersById, usersByUsername) {
+    this.usersById = usersById
+    this.usersByUsername = usersByUsername
+  }
+
+  registerUser(userId, username) {
+    this.usersById[userId] = new User(username)
+    this.usersByUsername[username] = userId
+    return Renderer.success("The user has successfully registered")
+  }
+
+  followUser(sourceUserId, targetUserId) {
+    this.usersById[sourceUserId].followings.push(targetUserId)
+    return Renderer.success(`${this.usersById[sourceUserId].username} started following ${this.usersById[targetUserId].username}`)
+  }
+
+  unfollowUser(sourceUserId, targetUserId) {
+    this.usersById[sourceUserId].followings = this.usersById[sourceUserId].followings.filter(fId => fId !== targetUserId)
+    return Renderer.success(`${this.usersById[sourceUserId].username} has unfollowing ${this.usersById[targetUserId].username}`)
+  }
+}
+
+class PostService {
+  constructor(usersById, posts) {
+    this.usersById = usersById
+    this.posts = posts
+  }
+
+  createPost(userId, postId, text) {
+    this.posts[postId] = new Post(userId, text)
+    this.usersById[userId].posts.push(postId)
+    return Renderer.success("The post has successfully crated")
+  }
+
+  deletePost(userId, postId) {
+    for (const userInfo of Object.values(this.usersById)) {
+      if (userInfo.likedPosts.includes(postId)) userInfo.likedPosts = userInfo.likedPosts.filter(pId => pId !== postId)
+    }
+    delete this.posts[postId]
+    this.usersById[userId].posts = this.usersById[userId].posts.filter(pId => pId !== postId)
+    return Renderer.success("The post has successfully deleted")
+  }
+
+  likePost(userId, postId) {
+    this.posts[postId].likes++
+    this.usersById[userId].likedPosts.push(postId)
+    return Renderer.success(`${this.usersById[userId].username} has liked the post`)
+  }
+
+  unlikePost(userId, postId) {
+    this.posts[postId].likes--
+    this.usersById[userId].likedPosts = this.usersById[userId].likedPosts.filter(pId => pId !== postId)
+    return Renderer.success(`${this.usersById[userId].username} has unliked the post`)
+  }
+}
+
+class FeedService {
+  constructor(usersById, posts) {
+    this.usersById = usersById
+    this.posts = posts
+  }
+
+  viewFeed(userId) {
+    const orderPostsId = FeedHelper.getOrderPosts(this.usersById[userId].posts, posts)
+    for (const postId of orderPostsId) {
+      Renderer.post({
+        text: posts[postId].text,
+        date: posts[postId].date,
+        likes: posts[postId].likes,
+        userId,
+        username: this.usersById[userId].username,
+        postId
+      })
+    }
+  }
+
+  viewFollowingsFeed(userId) {
+    const orderPostsId = FeedHelper.getOrderPosts(FeedHelper.getPostsId(this.usersById[userId].followings, this.usersById), this.posts)
+    for (const postId of orderPostsId) {
+      Renderer.post({
+        text: this.posts[postId].text,
+        date: this.posts[postId].date,
+        likes: this.posts[postId].likes,
+        userId: this.posts[postId].userId,
+        username: this.usersById[posts[postId].userId].username,
+        postId
+      })
+    }
+  }
+}
+
+class Program {
+  constructor(userService, postService, feedService) {
+    this.usersById = PREVIOUS_USERS_BY_ID
+    this.usersByUsername = PREVIOUS_USERS_BY_USERNAME
+    this.posts = PREVIOUS_POSTS
+    this.userService = new userService(this.usersById, this.usersByUsername)
+    this.postService = new postService(this.usersById, this.posts)
+    this.feedService = new feedService(this.usersById, this.posts)
+  }
+
+  async start() {
+    let opt
+    do {
+      Renderer.menu()
+      opt = (await ask("Enter the number of the action: ")).trim()
+      try {
+        await this.setOption(opt)
+      } catch (e) {
+        Renderer.error(e.message)
+      }
+    } while (opt !== "10")
+    rl.close()
+  }
+
+  async setOption(opt) {
+    switch (opt) {
+      case "1":{
+        const username = await Validator.isValidUsername((await ask("Enter the username: ")).trim())
+        if (this.usersByUsername[username]) throw new Error("The username already exists")
+        const id = IdHelper.getValidId(this.usersById, this.posts)
+        this.userService.registerUser(id, username)
+        break}
+      case "2":{
+        const sourceUserId = this.usersByUsername[await InputHelper.getExistingUsername(this.usersByUsername)]
+        const targetUserId = this.usersByUsername[await InputHelper.getExistingUsername(this.usersByUsername)]
+        if (sourceUserId === targetUserId) throw new Error("You can't follow yourself")
+        if (this.usersById[sourceUserId].followings.includes(targetUserId)) throw new Error("You already follow this user")
+        this.userService.followUser(sourceUserId, targetUserId)
+        break}
+      case "3":{
+        const sourceUserId = this.usersByUsername[await InputHelper.getExistingUsername(this.usersByUsername)]
+        const targetUserId = this.usersByUsername[await InputHelper.getExistingUsername(this.usersByUsername)]
+        if (!this.usersById[sourceUserId].followings.includes(targetUserId)) throw new Error("You don't follow this user")
+        this.userService.unfollowUser(sourceUserId, targetUserId)
+        break}
+      case "4":{
+        const userId = this.usersByUsername[await InputHelper.getExistingUsername(this.usersByUsername)]
+        const text = await Validator.isValidText((await ask("Enter the text: ")).trim())
+        const postId = IdHelper.getValidId(this.usersById, this.posts)
+        this.postService.createPost(userId, postId, text)
+        break}
+      case "5":{
+        const userId = this.usersByUsername[await InputHelper.getExistingUsername(this.usersByUsername)]
+        const postId = await InputHelper.getExistingPostId(this.posts)
+        if (!this.usersById[userId].posts.includes(postId)) throw new Error("The user has no posts with that ID")
+        this.postService.deletePost(userId, postId)
+        break}
+      case "6":{
+        const userId = this.usersByUsername[await InputHelper.getExistingUsername(this.usersByUsername)]
+        const postId = await InputHelper.getExistingPostId(this.posts)
+        if (this.usersById[userId].posts.includes(postId)) throw new Error("You can't like your own post")
+        if (this.usersById[userId].likedPosts.includes(postId)) throw new Error("You've already liked that post")
+        this.postService.likePost(userId, postId)
+        break}
+      case "7":{
+        const userId = this.usersByUsername[await InputHelper.getExistingUsername(this.usersByUsername)]
+        const postId = await InputHelper.getExistingPostId(this.posts)
+        if (!this.usersById[userId].likedPosts.includes(postId)) throw new Error("You haven't liked that post")
+        this.postService.unlikePost(userId, postId)
+        break}
+      case "8":{
+        const userId = this.usersByUsername[await InputHelper.getExistingUsername(this.usersByUsername)]
+        if (this.usersById[userId].posts.length === 0) throw new Error("The user has no posts")
+        this.feedService.viewFeed(userId)
+        break}
+      case "9":{
+        const userId = this.usersByUsername[await InputHelper.getExistingUsername(this.usersByUsername)]
+        if (this.usersById[userId].followings.length === 0) throw new Error("The user doesn't follow anyone")
+        this.feedService.viewFollowingsFeed(userId)
+        break}
+      case "0":{
+        console.log(this.usersById)
+        console.log(this.posts)
+        break}
+      default:break;
+    }
+  }
+}
+
+const program = new Program(UserService, PostService, FeedService)
+program.start()