feat: adds library data model and related interfaces for media items

lesson_10/libraries/src/library/library_guest.ts

@@ -0,0 +1,8 @@
+import { MediaItem } from './media_item.js';
+
+export interface LibraryGuest {
+  getId(): string;
+  getEmail(): string;
+  getName(): string;
+  getCheckedOutMediaItems(): ReadonlySet<MediaItem>;
+}

lesson_10/libraries/src/library/media_item.ts

@@ -0,0 +1,5 @@
+export interface MediaItem {
+  getId(): string;
+  getTitle(): string;
+  canCheckOut(): boolean;
+}

lesson_10/libraries/src/models/checkout_model.ts

@@ -0,0 +1,5 @@
+export interface CheckoutModel {
+  mediaItemId: string;
+  checkoutDate: Date;
+  dueDate: Date;
+}

lesson_10/libraries/src/models/library_data_model.ts

@@ -0,0 +1,36 @@
+import { LibraryGuest } from '../library/library_guest.js';
+import { MediaItem } from '../library/media_item.js';
+import { CheckoutModel } from './checkout_model.js';
+
+export class LibraryDataModel {
+  public mediaItems: MediaItem[];
+  public guests: LibraryGuest[];
+
+  constructor(mediaItems: MediaItem[], guests: LibraryGuest[]) {
+    this.mediaItems = mediaItems;
+    this.guests = guests;
+  }
+
+  public getMediaItems(): MediaItem[] {
+    return this.mediaItems;
+  }
+
+  public getGuests(): LibraryGuest[] {
+    return this.guests;
+  }
+
+  public getCheckoutsByEmail(): Map<string, CheckoutModel[]> {
+    const results = new Map<string, CheckoutModel[]>();
+    this.guests.forEach((guest) => {
+      results.set(
+        guest.getEmail(),
+        Array.from(guest.getCheckedOutMediaItems()).map((item: MediaItem) => ({
+          mediaItemId: item.getId(),
+          checkoutDate: new Date(),
+          dueDate: new Date(Date.now() + 14 * 24 * 60 * 60 * 1000), // 14 days from now
+        })),
+      );
+    });
+    return results;
+  }
+}

lesson_27/api/src/data/programs.json

@@ -19,6 +19,21 @@
       "id": "a06f970a-03b7-4cbb-9efd-f4e99029a456",
       "title": "Platform Programs",
       "description": "Platform programs are designed for high school graduates, college students, career changers, or professionals looking to develop the technology job readiness skills for today’s workforce."
+    },
+    {
+      "title": "new prog",
+      "description": "new ",
+      "id": "6d084301-3161-4f1a-b995-30478afb7f1d"
+    },
+    {
+      "title": "new ",
+      "description": "prog2",
+      "id": "2cc2e17d-1714-4d1d-8a22-dbf53c29e5b5"
+    },
+    {
+      "title": "new",
+      "description": "new",
+      "id": "44efa6e4-f7c5-4a36-8c64-4dd70403cb42"
     }
   ]
-}
+}

resources/queries/media_and_guest_queries.sql

@@ -0,0 +1,29 @@
+-- Query 1: Count of media items by type
+SELECT 
+    type,
+    COUNT(*) as item_count
+FROM media_items
+GROUP BY type
+ORDER BY type;
+
+-- Query 2: Sum of total pages checked out by guests
+SELECT 
+    SUM(pages) as total_pages_checked_out
+FROM checked_out_items
+WHERE guest_id IS NOT NULL;
+
+-- Query 3: All guests and their corresponding checked out items
+SELECT 
+    g.id as guest_id,
+    g.name as guest_name,
+    g.email as guest_email,
+    g.phone as guest_phone,
+    g.address as guest_address,
+    coi.id as checked_out_item_id,
+    coi.media_item_id,
+    coi.checkout_date,
+    coi.return_date,
+    coi.pages
+FROM guests g
+LEFT JOIN checked_out_items coi ON g.id = coi.guest_id
+ORDER BY g.id, coi.checkout_date;