feat: adds Tyrans's loadMediaItems() functionality and combines credits \w media items (#407)

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

Author: RiceViz

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

@@ -11,6 +11,7 @@ import { JoneemckellarLoader } from './joneemckellar_loader.js';
 import { LindaQuinoaLoader } from './linda_quinoa_loader.js';
 import { MattieWeathersbyLoader } from './mattie_weathersby_loader.js';
 import { NicoleJacksonLoader } from './nicole_jackson_loader.js';
+import { TyranRiceLoader } from './tyranricejr_loader.js';
 
 export const Loaders = Symbol.for('Loaders');
 
@@ -27,6 +28,7 @@ const LOADER_PROVIDERS = [
   LindaQuinoaLoader,  
   MattieWeathersbyLoader,
   NicoleJacksonLoader,
+  TyranRiceLoader,
 ];
 
 @Module({

lesson_10/libraries/src/loaders/tyranricejr_loader.ts

@@ -0,0 +1,60 @@
+import csv from 'csv-parser';
+import fs from 'fs';
+import { Credit, MediaItem } from '../models/index.js';
+import { Loader } from './loader.js';
+
+export class TyranRiceLoader implements Loader {
+  getLoaderName(): string {
+    return 'tyranricejr';
+  }
+
+  async loadData(): Promise<MediaItem[]> {
+    const credits = await this.loadCredits();
+    const mediaItems = await this.loadMediaItems();
+
+    // Build a quick lookup by media item id
+    const mediaMap = new Map<string, MediaItem>();
+    for (const item of mediaItems) {
+      mediaMap.set(item.getId(), item);
+    }
+
+    // Attach credits to the right media item
+    for (const credit of credits) {
+      const item = mediaMap.get(credit.getMediaItemId());
+      if (item) {
+        item.addCredit(credit);
+      }
+    }
+
+    console.log(
+      `Loaded ${credits.length} credits and ${mediaItems.length} media items`,
+    );
+
+    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, parseInt(year, 10), []));
+    }
+    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;
+  }
+}