feat: added speakers service #78

front-end/src/app/tabs/speakers/speakers.service.ts

@@ -0,0 +1,89 @@
+import { Injectable } from '@angular/core';
+import { IDEAApiService } from '@idea-ionic/common';
+
+import { Speaker } from '@models/speaker.model';
+
+@Injectable({ providedIn: 'root' })
+export class SpeakersService {
+  private speakers: Speaker[];
+
+  /**
+   * The number of speakers to consider for the pagination, when active.
+   */
+  MAX_PAGE_SIZE = 24;
+
+  constructor(private api: IDEAApiService) {}
+
+  private async loadList(): Promise<void> {
+    this.speakers = (await this.api.getResource(['speakers'])).map(s => new Speaker(s));
+  }
+
+  /**
+   * Get (and optionally filter) the list of speakers.
+   * Note: it can be paginated.
+   * Note: it's a slice of the array.
+   */
+  async getList(options: {
+    force?: boolean;
+    withPagination?: boolean;
+    startPaginationAfterId?: string;
+    search?: string;
+  }): Promise<Speaker[]> {
+    if (!this.speakers || options.force) await this.loadList();
+    if (!this.speakers) return null;
+
+    options.search = options.search ? String(options.search).toLowerCase() : '';
+
+    let filteredList = this.speakers.slice();
+
+    if (options.search)
+      filteredList = filteredList.filter(x =>
+        options.search
+          .split(' ')
+          .every(searchTerm =>
+            [x.speakerId, x.name, x.contactEmail, x.organization?.organizationId, x.organization?.name]
+              .filter(f => f)
+              .some(f => f.toLowerCase().includes(searchTerm))
+          )
+      );
+
+    if (options.withPagination && filteredList.length > this.MAX_PAGE_SIZE) {
+      let indexOfLastOfPreviousPage = 0;
+      if (options.startPaginationAfterId)
+        indexOfLastOfPreviousPage = filteredList.findIndex(x => x.speakerId === options.startPaginationAfterId) || 0;
+      filteredList = filteredList.slice(0, indexOfLastOfPreviousPage + this.MAX_PAGE_SIZE);
+    }
+
+    return filteredList;
+  }
+
+  /**
+   * Get the full details of a speaker by its id.
+   */
+  async getById(speakerId: string): Promise<Speaker> {
+    return new Speaker(await this.api.getResource(['speakers', speakerId]));
+  }
+
+  /**
+   * Insert a new speaker.
+   */
+  async insert(speaker: Speaker): Promise<Speaker> {
+    return new Speaker(await this.api.postResource(['speakers'], { body: speaker }));
+  }
+  /**
+   * Update an existing speaker.
+   */
+  async update(speaker: Speaker): Promise<Speaker> {
+    return new Speaker(
+      await this.api.putResource(['speakers', speaker.speakerId], {
+        body: speaker
+      })
+    );
+  }
+  /**
+   * Delete a speaker.
+   */
+  async delete(speaker: Speaker): Promise<void> {
+    await this.api.deleteResource(['speakers', speaker.speakerId]);
+  }
+}