From 9f31efd762762b41e5d4934b41fcd8c4947fbc11 Mon Sep 17 00:00:00 2001
From: Your Name <you@example.com>
Date: Sat, 27 Jun 2026 12:28:05 +0100
Subject: [PATCH] feat: add chat module skeleton

---
 BackendAcademy/src/app.module.ts              |  3 +-
 BackendAcademy/src/chat/chat.controller.ts    | 34 +++++++++++++++
 BackendAcademy/src/chat/chat.module.ts        | 10 +++++
 BackendAcademy/src/chat/chat.service.ts       | 42 +++++++++++++++++++
 .../src/chat/dto/create-message.dto.ts        |  5 +++
 .../src/chat/dto/create-room.dto.ts           |  5 +++
 .../src/chat/interfaces/chat.interface.ts     | 17 ++++++++
 7 files changed, 115 insertions(+), 1 deletion(-)
 create mode 100644 BackendAcademy/src/chat/chat.controller.ts
 create mode 100644 BackendAcademy/src/chat/chat.module.ts
 create mode 100644 BackendAcademy/src/chat/chat.service.ts
 create mode 100644 BackendAcademy/src/chat/dto/create-message.dto.ts
 create mode 100644 BackendAcademy/src/chat/dto/create-room.dto.ts
 create mode 100644 BackendAcademy/src/chat/interfaces/chat.interface.ts

diff --git a/BackendAcademy/src/app.module.ts b/BackendAcademy/src/app.module.ts
index 953c0c7dc..6878934e7 100644
--- a/BackendAcademy/src/app.module.ts
+++ b/BackendAcademy/src/app.module.ts
@@ -4,9 +4,10 @@ import { AppService } from './app.service';
 import { TutorProfileModule } from './users/tutor-profile.module';
 import { SubmissionModule } from './submissions/submission.module';
 import { RewardsModule } from './rewards/rewards.module';
+import { ChatModule } from './chat/chat.module';
 
 @Module({
-  imports: [TutorProfileModule, SubmissionModule, RewardsModule],
+  imports: [TutorProfileModule, SubmissionModule, RewardsModule, ChatModule],
   controllers: [AppController],
   providers: [AppService],
 })
diff --git a/BackendAcademy/src/chat/chat.controller.ts b/BackendAcademy/src/chat/chat.controller.ts
new file mode 100644
index 000000000..aa531d68d
--- /dev/null
+++ b/BackendAcademy/src/chat/chat.controller.ts
@@ -0,0 +1,34 @@
+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);
+  }
+}
diff --git a/BackendAcademy/src/chat/chat.module.ts b/BackendAcademy/src/chat/chat.module.ts
new file mode 100644
index 000000000..57e6ddcf2
--- /dev/null
+++ b/BackendAcademy/src/chat/chat.module.ts
@@ -0,0 +1,10 @@
+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 {}
diff --git a/BackendAcademy/src/chat/chat.service.ts b/BackendAcademy/src/chat/chat.service.ts
new file mode 100644
index 000000000..8dd3d4b25
--- /dev/null
+++ b/BackendAcademy/src/chat/chat.service.ts
@@ -0,0 +1,42 @@
+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);
+  }
+}
diff --git a/BackendAcademy/src/chat/dto/create-message.dto.ts b/BackendAcademy/src/chat/dto/create-message.dto.ts
new file mode 100644
index 000000000..4f43f41d8
--- /dev/null
+++ b/BackendAcademy/src/chat/dto/create-message.dto.ts
@@ -0,0 +1,5 @@
+export class CreateMessageDto {
+  roomId: string;
+  senderId: string;
+  content: string;
+}
diff --git a/BackendAcademy/src/chat/dto/create-room.dto.ts b/BackendAcademy/src/chat/dto/create-room.dto.ts
new file mode 100644
index 000000000..fd3b91eb6
--- /dev/null
+++ b/BackendAcademy/src/chat/dto/create-room.dto.ts
@@ -0,0 +1,5 @@
+export class CreateRoomDto {
+  name?: string;
+  type: 'direct' | 'room';
+  participants: string[];
+}
diff --git a/BackendAcademy/src/chat/interfaces/chat.interface.ts b/BackendAcademy/src/chat/interfaces/chat.interface.ts
new file mode 100644
index 000000000..4a19ea462
--- /dev/null
+++ b/BackendAcademy/src/chat/interfaces/chat.interface.ts
@@ -0,0 +1,17 @@
+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;
+}