feat: adds Ezra's media items and credits loader (#365)

* feat: adds Ezra's media items and credits loader

* feat: enhance Ezra's loader to associate credits with media items

* feat: add Ezra's loader to the loaders module

* feat: add Ezra's loader to the loaders module

* refactor: remove unnecessary console logs from Ezra's loader

---------

Co-authored-by: Ezra Nyabuti <enyabuti251@gmail.com>
Co-authored-by: Anthony D. Mays <anthonydmays@users.noreply.github.com>

Author: 3 people

lesson_10/libraries/src/loaders/ezra_nyabuti_loaders.ts

@@ -0,0 +1,51 @@
+import csv from 'csv-parser';
+import fs from 'fs';
+import { Credit, MediaItem } from '../models/index.js';
+import { Loader } from './loader.js';
+
+export class EzraNyabutiLoaders implements Loader {
+  getLoaderName(): string {
+    return 'ezranyabuti';
+  }
+
+  async loadData(): Promise<MediaItem[]> {
+    const credits = await this.loadCredits();
+    const mediaItems = await this.loadMediaItems();
+    const mediaMap = new Map<string, MediaItem>();
+    mediaItems.forEach((mediaItem) =>
+      mediaMap.set(mediaItem.getId(), mediaItem),
+    );
+    credits.forEach((credit) => {
+      const mediaItem = mediaMap.get(credit.getMediaItemId());
+      if (mediaItem) {
+        mediaItem.addCredit(credit);
+      }
+    });
+
+    return [...mediaItems.values()];
+  }
+
+  async loadMediaItems(): Promise<MediaItem[]> {
+    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;
+  }
+}

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 { EzraNyabutiLoaders } from './ezra_nyabuti_loaders.js';
 import { MeikoStephensLoader } from './meiko_stephens_loader.js';
 import { NiaPackLoader } from './nia_pack_loader.js';
 import { JBeyLoader } from './JBey_loader.js';
@@ -23,6 +24,7 @@ const LOADER_PROVIDERS = [
   NiaPackLoader,
   BryanaSingletonBarnhartLoader,
   DylanLaffertysLoader,
+  EzraNyabutiLoaders,
   DavisDLoader,
   ChanelHuttLoader,
   JBeyLoader,