Add chat module skeleton

BackendAcademy/src/chat/chat.controller.ts

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+import { Controller, Get, Post, Body, Param } from '@nestjs/common';
+import { ChatService } from './chat.service';
+import { CreateMessageDto } from './dto/create-message.dto';
+import { CreateRoomDto } from './dto/create-room.dto';
+
+@Controller('chat')
+export class ChatController {
+  constructor(private readonly chatService: ChatService) {}
+
+  @Post('rooms')
+  createRoom(@Body() createRoomDto: CreateRoomDto) {
+    return this.chatService.createRoom(createRoomDto);
+  }
+
+  @Get('rooms')
+  findAllRooms() {
+    return this.chatService.findAllRooms();
+  }
+
+  @Get('rooms/:roomId')
+  findRoom(@Param('roomId') roomId: string) {
+    return this.chatService.findRoomById(roomId);
+  }
+
+  @Post('messages')
+  createMessage(@Body() createMessageDto: CreateMessageDto) {
+    return this.chatService.createMessage(createMessageDto);
+  }
+
+  @Get('rooms/:roomId/messages')
+  findMessagesByRoom(@Param('roomId') roomId: string) {
+    return this.chatService.findMessagesByRoom(roomId);
+  }
+}

BackendAcademy/src/chat/chat.module.ts

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+import { Module } from '@nestjs/common';
+import { ChatController } from './chat.controller';
+import { ChatService } from './chat.service';
+
+@Module({
+  controllers: [ChatController],
+  providers: [ChatService],
+  exports: [ChatService],
+})
+export class ChatModule {}

BackendAcademy/src/chat/chat.service.ts

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+import { Injectable } from '@nestjs/common';
+import { ChatRoom, Message } from './interfaces/chat.interface';
+import { CreateMessageDto } from './dto/create-message.dto';
+import { CreateRoomDto } from './dto/create-room.dto';
+
+@Injectable()
+export class ChatService {
+  private rooms: ChatRoom[] = [];
+  private messages: Message[] = [];
+
+  createRoom(createRoomDto: CreateRoomDto): ChatRoom {
+    const newRoom: ChatRoom = {
+      id: Math.random().toString(36).substring(2, 9),
+      ...createRoomDto,
+      createdAt: new Date(),
+    };
+    this.rooms.push(newRoom);
+    return newRoom;
+  }
+
+  findAllRooms(): ChatRoom[] {
+    return this.rooms;
+  }
+
+  findRoomById(roomId: string): ChatRoom | undefined {
+    return this.rooms.find(r => r.id === roomId);
+  }
+
+  createMessage(createMessageDto: CreateMessageDto): Message {
+    const newMessage: Message = {
+      id: Math.random().toString(36).substring(2, 9),
+      ...createMessageDto,
+      createdAt: new Date(),
+    };
+    this.messages.push(newMessage);
+    return newMessage;
+  }
+
+  findMessagesByRoom(roomId: string): Message[] {
+    return this.messages.filter(m => m.roomId === roomId);
+  }
+}

BackendAcademy/src/chat/dto/create-message.dto.ts

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+export class CreateMessageDto {
+  roomId: string;
+  senderId: string;
+  content: string;
+}

BackendAcademy/src/chat/dto/create-room.dto.ts

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+export class CreateRoomDto {
+  name?: string;
+  type: 'direct' | 'room';
+  participants: string[];
+}

BackendAcademy/src/chat/interfaces/chat.interface.ts

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+export type ChatType = 'direct' | 'room';
+
+export interface ChatRoom {
+  id: string;
+  name?: string;
+  type: ChatType;
+  participants: string[];
+  createdAt: Date;
+}
+
+export interface Message {
+  id: string;
+  roomId: string;
+  senderId: string;
+  content: string;
+  createdAt: Date;
+}