Initial backend commit

.env.example

@@ -0,0 +1,17 @@
+# Server
+PORT=4000
+NODE_ENV=development
+
+# Database
+DB_HOST=localhost
+DB_PORT=5432
+DB_USERNAME=thumbpreview
+DB_PASSWORD=thumbpreview123
+DB_DATABASE=thumbpreview
+
+# YouTube API
+YOUTUBE_API_KEY=YOUR_YOUTUBE_API_KEY_HERE
+
+# Upload
+UPLOAD_DIR=./uploads
+MAX_FILE_SIZE=5242880

.gitignore

@@ -0,0 +1,31 @@
+# Dependencies
+node_modules/
+
+# Build output
+dist/
+
+# Environment
+.env
+.env.local
+
+# Logs
+*.log
+npm-debug.log*
+
+# IDE
+.idea/
+.vscode/
+*.swp
+*.swo
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Uploads (user content)
+uploads/*
+!uploads/.gitkeep
+
+# Database
+*.sqlite
+*.db

.prettierrc

@@ -0,0 +1,4 @@
+{
+  "singleQuote": true,
+  "trailingComma": "all"
+}

README.md

@@ -0,0 +1,98 @@
+<p align="center">
+  <a href="http://nestjs.com/" target="blank"><img src="https://nestjs.com/img/logo-small.svg" width="120" alt="Nest Logo" /></a>
+</p>
+
+[circleci-image]: https://img.shields.io/circleci/build/github/nestjs/nest/master?token=abc123def456
+[circleci-url]: https://circleci.com/gh/nestjs/nest
+
+  <p align="center">A progressive <a href="http://nodejs.org" target="_blank">Node.js</a> framework for building efficient and scalable server-side applications.</p>
+    <p align="center">
+<a href="https://www.npmjs.com/~nestjscore" target="_blank"><img src="https://img.shields.io/npm/v/@nestjs/core.svg" alt="NPM Version" /></a>
+<a href="https://www.npmjs.com/~nestjscore" target="_blank"><img src="https://img.shields.io/npm/l/@nestjs/core.svg" alt="Package License" /></a>
+<a href="https://www.npmjs.com/~nestjscore" target="_blank"><img src="https://img.shields.io/npm/dm/@nestjs/common.svg" alt="NPM Downloads" /></a>
+<a href="https://circleci.com/gh/nestjs/nest" target="_blank"><img src="https://img.shields.io/circleci/build/github/nestjs/nest/master" alt="CircleCI" /></a>
+<a href="https://discord.gg/G7Qnnhy" target="_blank"><img src="https://img.shields.io/badge/discord-online-brightgreen.svg" alt="Discord"/></a>
+<a href="https://opencollective.com/nest#backer" target="_blank"><img src="https://opencollective.com/nest/backers/badge.svg" alt="Backers on Open Collective" /></a>
+<a href="https://opencollective.com/nest#sponsor" target="_blank"><img src="https://opencollective.com/nest/sponsors/badge.svg" alt="Sponsors on Open Collective" /></a>
+  <a href="https://paypal.me/kamilmysliwiec" target="_blank"><img src="https://img.shields.io/badge/Donate-PayPal-ff3f59.svg" alt="Donate us"/></a>
+    <a href="https://opencollective.com/nest#sponsor"  target="_blank"><img src="https://img.shields.io/badge/Support%20us-Open%20Collective-41B883.svg" alt="Support us"></a>
+  <a href="https://twitter.com/nestframework" target="_blank"><img src="https://img.shields.io/twitter/follow/nestframework.svg?style=social&label=Follow" alt="Follow us on Twitter"></a>
+</p>
+  <!--[![Backers on Open Collective](https://opencollective.com/nest/backers/badge.svg)](https://opencollective.com/nest#backer)
+  [![Sponsors on Open Collective](https://opencollective.com/nest/sponsors/badge.svg)](https://opencollective.com/nest#sponsor)-->
+
+## Description
+
+[Nest](https://github.com/nestjs/nest) framework TypeScript starter repository.
+
+## Project setup
+
+```bash
+$ npm install
+```
+
+## Compile and run the project
+
+```bash
+# development
+$ npm run start
+
+# watch mode
+$ npm run start:dev
+
+# production mode
+$ npm run start:prod
+```
+
+## Run tests
+
+```bash
+# unit tests
+$ npm run test
+
+# e2e tests
+$ npm run test:e2e
+
+# test coverage
+$ npm run test:cov
+```
+
+## Deployment
+
+When you're ready to deploy your NestJS application to production, there are some key steps you can take to ensure it runs as efficiently as possible. Check out the [deployment documentation](https://docs.nestjs.com/deployment) for more information.
+
+If you are looking for a cloud-based platform to deploy your NestJS application, check out [Mau](https://mau.nestjs.com), our official platform for deploying NestJS applications on AWS. Mau makes deployment straightforward and fast, requiring just a few simple steps:
+
+```bash
+$ npm install -g mau
+$ mau deploy
+```
+
+With Mau, you can deploy your application in just a few clicks, allowing you to focus on building features rather than managing infrastructure.
+
+## Resources
+
+Check out a few resources that may come in handy when working with NestJS:
+
+- Visit the [NestJS Documentation](https://docs.nestjs.com) to learn more about the framework.
+- For questions and support, please visit our [Discord channel](https://discord.gg/G7Qnnhy).
+- To dive deeper and get more hands-on experience, check out our official video [courses](https://courses.nestjs.com/).
+- Deploy your application to AWS with the help of [NestJS Mau](https://mau.nestjs.com) in just a few clicks.
+- Visualize your application graph and interact with the NestJS application in real-time using [NestJS Devtools](https://devtools.nestjs.com).
+- Need help with your project (part-time to full-time)? Check out our official [enterprise support](https://enterprise.nestjs.com).
+- To stay in the loop and get updates, follow us on [X](https://x.com/nestframework) and [LinkedIn](https://linkedin.com/company/nestjs).
+- Looking for a job, or have a job to offer? Check out our official [Jobs board](https://jobs.nestjs.com).
+
+## Support
+
+Nest is an MIT-licensed open source project. It can grow thanks to the sponsors and support by the amazing backers. If you'd like to join them, please [read more here](https://docs.nestjs.com/support).
+
+## Stay in touch
+
+- Author - [Kamil Myśliwiec](https://twitter.com/kammysliwiec)
+- Website - [https://nestjs.com](https://nestjs.com/)
+- Twitter - [@nestframework](https://twitter.com/nestframework)
+
+## License
+
+Nest is [MIT licensed](https://github.com/nestjs/nest/blob/master/LICENSE).

eslint.config.mjs

@@ -0,0 +1,35 @@
+// @ts-check
+import eslint from '@eslint/js';
+import eslintPluginPrettierRecommended from 'eslint-plugin-prettier/recommended';
+import globals from 'globals';
+import tseslint from 'typescript-eslint';
+
+export default tseslint.config(
+  {
+    ignores: ['eslint.config.mjs'],
+  },
+  eslint.configs.recommended,
+  ...tseslint.configs.recommendedTypeChecked,
+  eslintPluginPrettierRecommended,
+  {
+    languageOptions: {
+      globals: {
+        ...globals.node,
+        ...globals.jest,
+      },
+      ecmaVersion: 5,
+      sourceType: 'module',
+      parserOptions: {
+        projectService: true,
+        tsconfigRootDir: import.meta.dirname,
+      },
+    },
+  },
+  {
+    rules: {
+      '@typescript-eslint/no-explicit-any': 'off',
+      '@typescript-eslint/no-floating-promises': 'warn',
+      '@typescript-eslint/no-unsafe-argument': 'warn'
+    },
+  },
+);

nest-cli.json

@@ -0,0 +1,8 @@
+{
+  "$schema": "https://json.schemastore.org/nest-cli",
+  "collection": "@nestjs/schematics",
+  "sourceRoot": "src",
+  "compilerOptions": {
+    "deleteOutDir": true
+  }
+}

package.json

@@ -0,0 +1,83 @@
+{
+  "name": "backend",
+  "version": "0.0.1",
+  "description": "",
+  "author": "",
+  "private": true,
+  "license": "UNLICENSED",
+  "scripts": {
+    "build": "nest build",
+    "format": "prettier --write \"src/**/*.ts\" \"test/**/*.ts\"",
+    "start": "nest start",
+    "start:dev": "nest start --watch",
+    "start:debug": "nest start --debug --watch",
+    "start:prod": "node dist/main",
+    "lint": "eslint \"{src,apps,libs,test}/**/*.ts\" --fix",
+    "test": "jest",
+    "test:watch": "jest --watch",
+    "test:cov": "jest --coverage",
+    "test:debug": "node --inspect-brk -r tsconfig-paths/register -r ts-node/register node_modules/.bin/jest --runInBand",
+    "test:e2e": "jest --config ./test/jest-e2e.json"
+  },
+  "dependencies": {
+    "@nestjs/axios": "^4.0.1",
+    "@nestjs/common": "^11.0.1",
+    "@nestjs/config": "^4.0.2",
+    "@nestjs/core": "^11.0.1",
+    "@nestjs/platform-express": "^11.0.1",
+    "@nestjs/typeorm": "^11.0.0",
+    "class-transformer": "^0.5.1",
+    "class-validator": "^0.14.3",
+    "multer": "^2.0.2",
+    "pg": "^8.17.2",
+    "reflect-metadata": "^0.2.2",
+    "rxjs": "^7.8.1",
+    "sharp": "^0.34.5",
+    "typeorm": "^0.3.28"
+  },
+  "devDependencies": {
+    "@eslint/eslintrc": "^3.2.0",
+    "@eslint/js": "^9.18.0",
+    "@nestjs/cli": "^11.0.0",
+    "@nestjs/schematics": "^11.0.0",
+    "@nestjs/testing": "^11.0.1",
+    "@swc/cli": "^0.6.0",
+    "@swc/core": "^1.10.7",
+    "@types/express": "^5.0.0",
+    "@types/jest": "^29.5.14",
+    "@types/multer": "^2.0.0",
+    "@types/node": "^22.10.7",
+    "@types/supertest": "^6.0.2",
+    "eslint": "^9.18.0",
+    "eslint-config-prettier": "^10.0.1",
+    "eslint-plugin-prettier": "^5.2.2",
+    "globals": "^16.0.0",
+    "jest": "^29.7.0",
+    "prettier": "^3.4.2",
+    "source-map-support": "^0.5.21",
+    "supertest": "^7.0.0",
+    "ts-jest": "^29.2.5",
+    "ts-loader": "^9.5.2",
+    "ts-node": "^10.9.2",
+    "tsconfig-paths": "^4.2.0",
+    "typescript": "^5.7.3",
+    "typescript-eslint": "^8.20.0"
+  },
+  "jest": {
+    "moduleFileExtensions": [
+      "js",
+      "json",
+      "ts"
+    ],
+    "rootDir": "src",
+    "testRegex": ".*\\.spec\\.ts$",
+    "transform": {
+      "^.+\\.(t|j)s$": "ts-jest"
+    },
+    "collectCoverageFrom": [
+      "**/*.(t|j)s"
+    ],
+    "coverageDirectory": "../coverage",
+    "testEnvironment": "node"
+  }
+}

src/app.module.ts

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+import { Module } from '@nestjs/common';
+import { ConfigModule, ConfigService } from '@nestjs/config';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { ThumbnailsModule } from './modules/thumbnails/thumbnails.module';
+import { YouTubeModule } from './modules/youtube/youtube.module';
+
+@Module({
+  imports: [
+    ConfigModule.forRoot({
+      isGlobal: true,
+    }),
+    TypeOrmModule.forRootAsync({
+      imports: [ConfigModule],
+      useFactory: (configService: ConfigService) => ({
+        type: 'postgres',
+        host: configService.get('DB_HOST', 'localhost'),
+        port: configService.get('DB_PORT', 5432),
+        username: configService.get('DB_USERNAME', 'thumbpreview'),
+        password: configService.get('DB_PASSWORD', 'thumbpreview123'),
+        database: configService.get('DB_DATABASE', 'thumbpreview'),
+        entities: [__dirname + '/**/*.entity{.ts,.js}'],
+        synchronize: configService.get('NODE_ENV') !== 'production',
+      }),
+      inject: [ConfigService],
+    }),
+    ThumbnailsModule,
+    YouTubeModule,
+  ],
+})
+export class AppModule {}

src/entities/thumbnail.entity.ts

@@ -0,0 +1,27 @@
+import {
+  Entity,
+  PrimaryGeneratedColumn,
+  Column,
+  CreateDateColumn,
+} from 'typeorm';
+
+@Entity('thumbnails')
+export class Thumbnail {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Column()
+  filePath: string;
+
+  @Column()
+  originalName: string;
+
+  @Column({ nullable: true })
+  title: string;
+
+  @Column({ default: 0 })
+  position: number;
+
+  @CreateDateColumn()
+  createdAt: Date;
+}

src/entities/youtube-cache.entity.ts

@@ -0,0 +1,27 @@
+import {
+  Entity,
+  PrimaryGeneratedColumn,
+  Column,
+  CreateDateColumn,
+  Index,
+} from 'typeorm';
+
+@Entity('youtube_cache')
+export class YouTubeCache {
+  @PrimaryGeneratedColumn('uuid')
+  id: string;
+
+  @Index()
+  @Column()
+  searchQuery: string;
+
+  @Column('jsonb')
+  results: any;
+
+  @CreateDateColumn()
+  createdAt: Date;
+
+  @Index()
+  @Column()
+  expiresAt: Date;
+}

src/main.ts

@@ -0,0 +1,36 @@
+import { NestFactory } from '@nestjs/core';
+import { ValidationPipe } from '@nestjs/common';
+import { AppModule } from './app.module';
+import { join } from 'path';
+import { NestExpressApplication } from '@nestjs/platform-express';
+
+async function bootstrap() {
+  const app = await NestFactory.create<NestExpressApplication>(AppModule);
+
+  // Global prefix
+  app.setGlobalPrefix('api');
+
+  // Validation
+  app.useGlobalPipes(
+    new ValidationPipe({
+      whitelist: true,
+      transform: true,
+    }),
+  );
+
+  // CORS
+  app.enableCors({
+    origin: ['http://localhost:3000', 'http://localhost:5173'],
+    credentials: true,
+  });
+
+  // Static files for uploads
+  app.useStaticAssets(join(__dirname, '..', 'uploads'), {
+    prefix: '/uploads/',
+  });
+
+  const port = process.env.PORT ?? 4000;
+  await app.listen(port);
+  console.log(`Backend running on http://localhost:${port}`);
+}
+bootstrap();

src/modules/thumbnails/thumbnails.controller.ts

@@ -0,0 +1,33 @@
+import {
+  Controller,
+  Post,
+  Delete,
+  Param,
+  UseInterceptors,
+  UploadedFile,
+  BadRequestException,
+} from '@nestjs/common';
+import { FileInterceptor } from '@nestjs/platform-express';
+import { ThumbnailsService } from './thumbnails.service';
+
+@Controller('thumbnails')
+export class ThumbnailsController {
+  constructor(private readonly thumbnailsService: ThumbnailsService) {}
+
+  @Post('upload')
+  @UseInterceptors(FileInterceptor('file'))
+  async upload(@UploadedFile() file: Express.Multer.File) {
+    if (!file) {
+      throw new BadRequestException('No file uploaded');
+    }
+
+    const thumbnail = await this.thumbnailsService.create(file);
+    return this.thumbnailsService.formatThumbnailResponse(thumbnail);
+  }
+
+  @Delete(':id')
+  async remove(@Param('id') id: string) {
+    await this.thumbnailsService.remove(id);
+    return { success: true };
+  }
+}

src/modules/thumbnails/thumbnails.module.ts

@@ -0,0 +1,38 @@
+import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { MulterModule } from '@nestjs/platform-express';
+import { diskStorage } from 'multer';
+import { extname } from 'path';
+import { v4 as uuidv4 } from 'uuid';
+import { ThumbnailsController } from './thumbnails.controller';
+import { ThumbnailsService } from './thumbnails.service';
+import { Thumbnail } from '../../entities/thumbnail.entity';
+
+@Module({
+  imports: [
+    TypeOrmModule.forFeature([Thumbnail]),
+    MulterModule.register({
+      storage: diskStorage({
+        destination: './uploads',
+        filename: (req, file, callback) => {
+          const uniqueName = `${uuidv4()}${extname(file.originalname)}`;
+          callback(null, uniqueName);
+        },
+      }),
+      fileFilter: (req, file, callback) => {
+        const allowedMimes = ['image/jpeg', 'image/png', 'image/webp'];
+        if (allowedMimes.includes(file.mimetype)) {
+          callback(null, true);
+        } else {
+          callback(new Error('Invalid file type'), false);
+        }
+      },
+      limits: {
+        fileSize: 5 * 1024 * 1024, // 5MB
+      },
+    }),
+  ],
+  controllers: [ThumbnailsController],
+  providers: [ThumbnailsService],
+})
+export class ThumbnailsModule {}

src/modules/thumbnails/thumbnails.service.ts

@@ -0,0 +1,55 @@
+import { Injectable, NotFoundException } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository } from 'typeorm';
+import { unlink } from 'fs/promises';
+import { join } from 'path';
+import { Thumbnail } from '../../entities/thumbnail.entity';
+
+@Injectable()
+export class ThumbnailsService {
+  constructor(
+    @InjectRepository(Thumbnail)
+    private thumbnailRepository: Repository<Thumbnail>,
+  ) {}
+
+  async create(file: Express.Multer.File): Promise<Thumbnail> {
+    const thumbnail = this.thumbnailRepository.create({
+      filePath: file.filename,
+      originalName: file.originalname,
+      title: file.originalname.replace(/\.[^/.]+$/, ''),
+    });
+
+    return this.thumbnailRepository.save(thumbnail);
+  }
+
+  async findOne(id: string): Promise<Thumbnail> {
+    const thumbnail = await this.thumbnailRepository.findOne({ where: { id } });
+    if (!thumbnail) {
+      throw new NotFoundException(`Thumbnail with ID ${id} not found`);
+    }
+    return thumbnail;
+  }
+
+  async remove(id: string): Promise<void> {
+    const thumbnail = await this.findOne(id);
+
+    // Delete file from disk
+    try {
+      await unlink(join('./uploads', thumbnail.filePath));
+    } catch (error) {
+      console.error('Error deleting file:', error);
+    }
+
+    await this.thumbnailRepository.remove(thumbnail);
+  }
+
+  formatThumbnailResponse(thumbnail: Thumbnail) {
+    return {
+      id: thumbnail.id,
+      url: `/uploads/${thumbnail.filePath}`,
+      originalName: thumbnail.originalName,
+      title: thumbnail.title,
+      position: thumbnail.position,
+    };
+  }
+}

src/modules/youtube/youtube.controller.ts

@@ -0,0 +1,24 @@
+import { Controller, Get, Query, BadRequestException } from '@nestjs/common';
+import { YouTubeService, YouTubeVideoResponse } from './youtube.service';
+
+@Controller('youtube')
+export class YouTubeController {
+  constructor(private readonly youtubeService: YouTubeService) {}
+
+  @Get('search')
+  async search(
+    @Query('q') query: string,
+    @Query('maxResults') maxResults?: string,
+  ): Promise<YouTubeVideoResponse[]> {
+    if (!query || query.trim().length === 0) {
+      throw new BadRequestException('Search query is required');
+    }
+
+    const results = await this.youtubeService.search(
+      query.trim(),
+      maxResults ? parseInt(maxResults, 10) : 10,
+    );
+
+    return results;
+  }
+}

src/modules/youtube/youtube.module.ts

@@ -0,0 +1,16 @@
+import { Module } from '@nestjs/common';
+import { TypeOrmModule } from '@nestjs/typeorm';
+import { HttpModule } from '@nestjs/axios';
+import { YouTubeController } from './youtube.controller';
+import { YouTubeService } from './youtube.service';
+import { YouTubeCache } from '../../entities/youtube-cache.entity';
+
+@Module({
+  imports: [
+    TypeOrmModule.forFeature([YouTubeCache]),
+    HttpModule,
+  ],
+  controllers: [YouTubeController],
+  providers: [YouTubeService],
+})
+export class YouTubeModule {}

src/modules/youtube/youtube.service.ts

@@ -0,0 +1,201 @@
+import { Injectable } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository, MoreThan } from 'typeorm';
+import { HttpService } from '@nestjs/axios';
+import { firstValueFrom } from 'rxjs';
+import { YouTubeCache } from '../../entities/youtube-cache.entity';
+
+interface YouTubeSearchItem {
+  id: { videoId: string };
+  snippet: {
+    title: string;
+    channelTitle: string;
+    publishedAt: string;
+    thumbnails: {
+      medium: { url: string };
+      high: { url: string };
+    };
+  };
+}
+
+export interface YouTubeVideoResponse {
+  videoId: string;
+  title: string;
+  channelTitle: string;
+  thumbnailUrl: string;
+  publishedAt: string;
+  viewCount?: string;
+}
+
+interface YouTubeSearchResponse {
+  items: YouTubeSearchItem[];
+}
+
+interface YouTubeStatsResponse {
+  items: Array<{
+    id: string;
+    statistics: {
+      viewCount: string;
+    };
+  }>;
+}
+
+@Injectable()
+export class YouTubeService {
+  private readonly apiKey: string;
+  private readonly cacheHours = 24;
+
+  constructor(
+    private configService: ConfigService,
+    private httpService: HttpService,
+    @InjectRepository(YouTubeCache)
+    private cacheRepository: Repository<YouTubeCache>,
+  ) {
+    this.apiKey = this.configService.get<string>('YOUTUBE_API_KEY', '');
+  }
+
+  async search(query: string, maxResults = 10): Promise<YouTubeVideoResponse[]> {
+    // Check cache first
+    const cached = await this.getFromCache(query);
+    if (cached) {
+      return cached;
+    }
+
+    // If no API key, return mock data for development
+    if (!this.apiKey || this.apiKey === 'YOUR_YOUTUBE_API_KEY_HERE') {
+      return this.getMockResults(query, maxResults);
+    }
+
+    // Fetch from YouTube API
+    const results = await this.fetchFromYouTube(query, maxResults);
+
+    // Save to cache
+    await this.saveToCache(query, results);
+
+    return results;
+  }
+
+  private async getFromCache(query: string): Promise<YouTubeVideoResponse[] | null> {
+    const cached = await this.cacheRepository.findOne({
+      where: {
+        searchQuery: query.toLowerCase(),
+        expiresAt: MoreThan(new Date()),
+      },
+    });
+
+    return cached ? cached.results : null;
+  }
+
+  private async saveToCache(query: string, results: YouTubeVideoResponse[]): Promise<void> {
+    const expiresAt = new Date();
+    expiresAt.setHours(expiresAt.getHours() + this.cacheHours);
+
+    const cache = this.cacheRepository.create({
+      searchQuery: query.toLowerCase(),
+      results,
+      expiresAt,
+    });
+
+    await this.cacheRepository.save(cache);
+  }
+
+  private async fetchFromYouTube(query: string, maxResults: number): Promise<YouTubeVideoResponse[]> {
+    const searchUrl = 'https://www.googleapis.com/youtube/v3/search';
+
+    const { data } = await firstValueFrom(
+      this.httpService.get<YouTubeSearchResponse>(searchUrl, {
+        params: {
+          part: 'snippet',
+          q: query,
+          type: 'video',
+          maxResults,
+          key: this.apiKey,
+        },
+      }),
+    );
+
+    const videoIds = data.items.map((item: YouTubeSearchItem) => item.id.videoId).join(',');
+
+    // Get view counts
+    const statsUrl = 'https://www.googleapis.com/youtube/v3/videos';
+    const { data: statsData } = await firstValueFrom(
+      this.httpService.get<YouTubeStatsResponse>(statsUrl, {
+        params: {
+          part: 'statistics',
+          id: videoIds,
+          key: this.apiKey,
+        },
+      }),
+    );
+
+    const viewCounts = new Map<string, string>();
+    statsData.items.forEach((item) => {
+      viewCounts.set(item.id, item.statistics.viewCount);
+    });
+
+    return data.items.map((item: YouTubeSearchItem) => ({
+      videoId: item.id.videoId,
+      title: item.snippet.title,
+      channelTitle: item.snippet.channelTitle,
+      thumbnailUrl: item.snippet.thumbnails.high?.url || item.snippet.thumbnails.medium.url,
+      publishedAt: item.snippet.publishedAt,
+      viewCount: viewCounts.get(item.id.videoId),
+    }));
+  }
+
+  private getMockResults(query: string, maxResults: number): YouTubeVideoResponse[] {
+    const mockVideos: YouTubeVideoResponse[] = [
+      {
+        videoId: 'mock1',
+        title: `${query} - Complete Tutorial for Beginners`,
+        channelTitle: 'Tech Academy',
+        thumbnailUrl: 'https://i.ytimg.com/vi/dQw4w9WgXcQ/hqdefault.jpg',
+        publishedAt: new Date(Date.now() - 7 * 24 * 60 * 60 * 1000).toISOString(),
+        viewCount: '1250000',
+      },
+      {
+        videoId: 'mock2',
+        title: `Learn ${query} in 30 Minutes`,
+        channelTitle: 'Code Master',
+        thumbnailUrl: 'https://i.ytimg.com/vi/9bZkp7q19f0/hqdefault.jpg',
+        publishedAt: new Date(Date.now() - 30 * 24 * 60 * 60 * 1000).toISOString(),
+        viewCount: '890000',
+      },
+      {
+        videoId: 'mock3',
+        title: `${query} Crash Course 2025`,
+        channelTitle: 'Dev Tutorial',
+        thumbnailUrl: 'https://i.ytimg.com/vi/kJQP7kiw5Fk/hqdefault.jpg',
+        publishedAt: new Date(Date.now() - 14 * 24 * 60 * 60 * 1000).toISOString(),
+        viewCount: '2100000',
+      },
+      {
+        videoId: 'mock4',
+        title: `Why ${query} is Amazing`,
+        channelTitle: 'Tech Reviews',
+        thumbnailUrl: 'https://i.ytimg.com/vi/RgKAFK5djSk/hqdefault.jpg',
+        publishedAt: new Date(Date.now() - 60 * 24 * 60 * 60 * 1000).toISOString(),
+        viewCount: '450000',
+      },
+      {
+        videoId: 'mock5',
+        title: `${query} Tips and Tricks`,
+        channelTitle: 'Pro Tips',
+        thumbnailUrl: 'https://i.ytimg.com/vi/fJ9rUzIMcZQ/hqdefault.jpg',
+        publishedAt: new Date(Date.now() - 3 * 24 * 60 * 60 * 1000).toISOString(),
+        viewCount: '320000',
+      },
+      {
+        videoId: 'mock6',
+        title: `${query} for Professionals`,
+        channelTitle: 'Advanced Learning',
+        thumbnailUrl: 'https://i.ytimg.com/vi/09R8_2nJtjg/hqdefault.jpg',
+        publishedAt: new Date(Date.now() - 45 * 24 * 60 * 60 * 1000).toISOString(),
+        viewCount: '780000',
+      },
+    ];
+
+    return mockVideos.slice(0, maxResults);
+  }
+}

test/app.e2e-spec.ts

@@ -0,0 +1,25 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { INestApplication } from '@nestjs/common';
+import * as request from 'supertest';
+import { App } from 'supertest/types';
+import { AppModule } from './../src/app.module';
+
+describe('AppController (e2e)', () => {
+  let app: INestApplication<App>;
+
+  beforeEach(async () => {
+    const moduleFixture: TestingModule = await Test.createTestingModule({
+      imports: [AppModule],
+    }).compile();
+
+    app = moduleFixture.createNestApplication();
+    await app.init();
+  });
+
+  it('/ (GET)', () => {
+    return request(app.getHttpServer())
+      .get('/')
+      .expect(200)
+      .expect('Hello World!');
+  });
+});

test/jest-e2e.json

@@ -0,0 +1,9 @@
+{
+  "moduleFileExtensions": ["js", "json", "ts"],
+  "rootDir": ".",
+  "testEnvironment": "node",
+  "testRegex": ".e2e-spec.ts$",
+  "transform": {
+    "^.+\\.(t|j)s$": "ts-jest"
+  }
+}

tsconfig.build.json

@@ -0,0 +1,4 @@
+{
+  "extends": "./tsconfig.json",
+  "exclude": ["node_modules", "test", "dist", "**/*spec.ts"]
+}

tsconfig.json

@@ -0,0 +1,21 @@
+{
+  "compilerOptions": {
+    "module": "commonjs",
+    "declaration": true,
+    "removeComments": true,
+    "emitDecoratorMetadata": true,
+    "experimentalDecorators": true,
+    "allowSyntheticDefaultImports": true,
+    "target": "ES2023",
+    "sourceMap": true,
+    "outDir": "./dist",
+    "baseUrl": "./",
+    "incremental": true,
+    "skipLibCheck": true,
+    "strictNullChecks": true,
+    "forceConsistentCasingInFileNames": true,
+    "noImplicitAny": false,
+    "strictBindCallApply": false,
+    "noFallthroughCasesInSwitch": false
+  }
+}