feat(sample): make echo bot

sample/app.module.ts

@@ -1,5 +1,6 @@
 import { Module } from '@nestjs/common';
 import { TelegrafModule } from '../lib';
+import { EchoService } from './echo.service';
 import { AppUpdate } from './app.update';
 
 @Module({
@@ -8,6 +9,6 @@ import { AppUpdate } from './app.update';
       token: '1467731595:AAHCvH65H9VQYKF9jE-E8c2rXsQBVAYseg8',
     }),
   ],
-  providers: [AppUpdate],
+  providers: [EchoService, AppUpdate],
 })
 export class AppModule {}

sample/app.update.ts

@@ -1,9 +1,37 @@
-import { On, Update } from '../lib/decorators';
+import { Telegraf } from 'telegraf';
+import { Help, InjectBot, On, Start, Update } from '../lib/decorators';
+import { Context } from '../lib/interfaces';
+import { EchoService } from './echo.service';
 
 @Update()
 export class AppUpdate {
+  constructor(
+    @InjectBot()
+    private readonly bot: Telegraf<Context>,
+    private readonly echoService: EchoService,
+  ) {}
+
+  @Start()
+  async onStart(ctx: Context): Promise<void> {
+    const me = await this.bot.telegram.getMe();
+    await ctx.reply(`Hey, I'm ${me.first_name}`);
+  }
+
+  @Help()
+  async onHelp(ctx: Context): Promise<void> {
+    await ctx.reply('Send me any text');
+  }
+
   @On('message')
-  onMessage(): void {
+  async onMessage(ctx: Context): Promise<void> {
     console.log('New message received');
+
+    if ('text' in ctx.message) {
+      const messageText = ctx.message.text;
+      const echoText = this.echoService.echo(messageText);
+      await ctx.reply(echoText);
+    } else {
+      await ctx.reply('Only text messages');
+    }
   }
 }

sample/echo.service.ts

@@ -0,0 +1,8 @@
+import { Injectable } from '@nestjs/common';
+
+@Injectable()
+export class EchoService {
+  echo(text: string): string {
+    return `Echo: ${text}`;
+  }
+}