feat: adds Nia's loader for media items and credits (#370)

Co-authored-by: Anthony D. Mays <[email protected]>

Author: nia-source

lesson_10/libraries/src/loaders/loaders.module.ts

@@ -5,6 +5,7 @@ import { ChanelHuttLoader } from './chanel_hutt_loader.js';
 import { DavidAdenaikeLoader } from './david_adenaike_loader.js';
 import { DavisDLoader } from './davis_d_loader.js';
 import { DylanLaffertysLoader } from './dylan_lafferty_loaders.js';
+import { NiaPackLoader } from './nia_pack_loader.js';
 import { JBeyLoader } from './JBey_loader.js';
 import { KarenAlabiLoader } from './karen_alabi_loader.js';
 import { MercedesMathewsLoader } from './mercedes_mathews_loader.js';
@@ -16,6 +17,7 @@ export const Loaders = Symbol.for('Loaders');
 
 const LOADER_PROVIDERS = [
   AnthonyMaysLoader,
+  NiaPackLoader,
   BryanaSingletonBarnhartLoader,
   DylanLaffertysLoader,
   DavisDLoader,

lesson_10/libraries/src/loaders/nia_pack_loader.ts

@@ -0,0 +1,46 @@
+import csv from 'csv-parser';
+import fs from 'fs';
+import { Credit, MediaItem } from '../models/index.js';
+import { Loader } from './loader.js';
+
+export class NiaPackLoader implements Loader {
+  getLoaderName(): string {
+    return 'niapack';
+  }
+
+  async loadData(): Promise<MediaItem[]> {
+    const credits = await this.loadCredits();
+    const mediaItems = await this.loadMediaItems();
+
+    console.log(
+      `Loaded ${credits.length} credits and ${mediaItems.length} media items`,
+    );
+
+    return [...mediaItems.values()];
+  }
+
+  async loadMediaItems(): Promise<MediaItem[]> {
+    // TODO: Implement this method.
+    const mediaItems = [];
+    const readable = fs
+      .createReadStream('data/media_items.csv', 'utf-8')
+      .pipe(csv());
+    for await (const row of readable) {
+      const { id, type, title, year } = row;
+      mediaItems.push(new MediaItem(id, title, type, year, []));
+    }
+    return mediaItems;
+  }
+
+  async loadCredits(): Promise<Credit[]> {
+    const credits = [];
+    const readable = fs
+      .createReadStream('data/credits.csv', 'utf-8')
+      .pipe(csv());
+    for await (const row of readable) {
+      const { media_item_id, role, name } = row;
+      credits.push(new Credit(media_item_id, name, role));
+    }
+    return credits;
+  }
+}