- add feed repo

- Add feed service
- Add tests for feed service

src/services/FeedService.ts

@@ -0,0 +1,63 @@
+import { IFeedRepository } from '../repositories/FeedRepository.js';
+import { IFeed, ICreateFeedDto, IUpdateFeedDto, IFeedQuery, IPaginatedResponse, NewsSource } from '../types/Feed.js';
+
+export interface IFeedService {
+  createFeed(feedData: ICreateFeedDto): Promise<IFeed>;
+  getFeedById(id: string): Promise<IFeed | null>;
+  getAllFeeds(query?: IFeedQuery): Promise<IPaginatedResponse<IFeed>>;
+  updateFeed(id: string, updateData: IUpdateFeedDto): Promise<IFeed | null>;
+  deleteFeed(id: string): Promise<boolean>;
+  getTodaysFrontPageNews(): Promise<IFeed[]>;
+  getFeedsBySource(source: NewsSource, limit?: number): Promise<IFeed[]>;
+}
+
+export class FeedService implements IFeedService {
+  constructor(private feedRepository: IFeedRepository) {}
+
+  async createFeed(feedData: ICreateFeedDto): Promise<IFeed> {
+    const existingFeed = await this.feedRepository.findByUrl(feedData.url);
+    if (existingFeed) {
+      throw new Error('A feed with this URL already exists');
+    }
+    return await this.feedRepository.create(feedData);
+  }
+
+  async getFeedById(id: string): Promise<IFeed | null> {
+    return await this.feedRepository.findById(id);
+  }
+
+  async getAllFeeds(query: IFeedQuery = {}): Promise<IPaginatedResponse<IFeed>> {
+    const sanitizedQuery = {
+      ...query,
+      limit: query.limit || 20,
+      page: query.page || 1
+    };
+    return await this.feedRepository.findAll(sanitizedQuery);
+  }
+
+  async updateFeed(id: string, updateData: IUpdateFeedDto): Promise<IFeed | null> {
+    if (updateData.url) {
+      const existingFeed = await this.feedRepository.findByUrl(updateData.url);
+      if (existingFeed && existingFeed._id !== id) {
+        throw new Error('A feed with this URL already exists');
+      }
+    }
+    return await this.feedRepository.update(id, updateData);
+  }
+
+  async deleteFeed(id: string): Promise<boolean> {
+    return await this.feedRepository.delete(id);
+  }
+
+  async getTodaysFrontPageNews(): Promise<IFeed[]> {
+    const [elPaisFeeds, elMundoFeeds] = await Promise.all([
+      this.feedRepository.findTodaysFrontPage(NewsSource.EL_PAIS),
+      this.feedRepository.findTodaysFrontPage(NewsSource.EL_MUNDO)
+    ]);
+    return [...elPaisFeeds, ...elMundoFeeds];
+  }
+
+  async getFeedsBySource(source: NewsSource, limit: number = 10): Promise<IFeed[]> {
+    return await this.feedRepository.findBySource(source);
+  }
+}