Initial commit

backend/services/chatService.js

@@ -0,0 +1,76 @@
+import { v4 as uuidv4 } from 'uuid';
+
+let messages = [];
+let searchQueue = [];
+let users = [];
+let currentChats = [];
+
+export const getMessages = (toId, fromId) => {
+  const userChats = currentChats.filter(chat => chat.includes(toId) && chat.includes(fromId));
+  if (userChats.length === 0) {
+    fromId = '';
+  }
+  const userMessages = messages.filter(message => message.to = toId && ["system", fromId].includes(message.from));
+  messages = messages.filter(message => message.to === toId && ["system", fromId].includes(message.from));
+  return userMessages;
+};
+
+export const addMessage = (from, to, text) => {
+  const userChats = currentChats.filter(chat => chat.includes(from) && chat.includes(to));
+  if (userChats.length === 0) {
+    return;
+  }
+  messages.push({ from: from, to: to, text: text });
+  return { text: text };
+};
+
+export const findMatch = (genders, age, id) => {
+  const currentUsersChat = currentChats.filter(chat => chat.includes(id));
+  if (currentUsersChat.length > 0) {
+    return findUser(currentUsersChat[0][0] === id ? currentUsersChat[0][1] : currentUsersChat[0][0]);
+  }
+  let filteredSearchQueue = users.filter(user =>
+    searchQueue.some(sq => sq.id === user.id) && user.id !== id
+    && currentChats.filter(chat => chat.includes(user.id)).length === 0
+  ).sort(() => Math.random() - 0.5);
+  for (let i = 0; i < filteredSearchQueue.length; i++) {
+    const user = filteredSearchQueue[i];
+    const ageMatch = user.age >= age.min && user.age <= age.max;
+    const genderMatch = genders.includes(user.gender);
+    if (ageMatch && genderMatch) {
+      for (let j = searchQueue.length - 1; j >= 0; j--) {
+        if ([id, user.id].includes(searchQueue[j].id)) {
+          searchQueue.splice(j, 1);
+        }
+      }
+      currentChats.push([user.id, id]);
+      return user;
+    }
+  }
+  if (!searchQueue.find(user => user.id === id)) {
+    searchQueue.push({ id, genders, age });
+  }
+  return null;
+};
+
+const findUser = (id) => {
+  return users.find(user => user.id === id);
+};
+
+export const registerUser = (gender, age) => {
+  const id = uuidv4();
+  users.push({ gender, age, id });
+  return id;
+};
+
+export const removeUser = (id) => {
+  searchQueue = searchQueue.filter(user => user.id !== id);
+  users = users.filter(user => user.id !== id);
+  currentChats = currentChats.filter(pair => pair[0] === id || pair[1] === id);
+  messages = messages.filter(message => message.from === id || message.to === id);
+};
+
+export const endChat = (userId) => {
+  currentChats = currentChats.filter(chat => !chat.includes(userId));
+  messages.push({ to: userId, from: 'system', activity: 'otheruserleft'})
+}