feat: add collections (#484)

closes #418

server/models/Collection.ts

@@ -0,0 +1,29 @@
+import { TmdbCollection } from '../api/themoviedb';
+import Media from '../entity/Media';
+import { mapMovieResult, MovieResult } from './Search';
+
+export interface Collection {
+  id: number;
+  name: string;
+  overview?: string;
+  posterPath?: string;
+  backdropPath?: string;
+  parts: MovieResult[];
+}
+
+export const mapCollection = (
+  collection: TmdbCollection,
+  media: Media[]
+): Collection => ({
+  id: collection.id,
+  name: collection.name,
+  overview: collection.overview,
+  posterPath: collection.poster_path,
+  backdropPath: collection.backdrop_path,
+  parts: collection.parts.map((part) =>
+    mapMovieResult(
+      part,
+      media?.find((req) => req.tmdbId === part.id)
+    )
+  ),
+});