refactor: extract shared functions and interfaces from angular app

shared/channel.interface.ts

@@ -0,0 +1,32 @@
+/**
+ * Represents channel object
+ * TODO: define channel interface in iptv-parser library
+ */
+export interface Channel {
+    id: string;
+    url: string;
+    name: string;
+    group: {
+        title: string;
+    };
+    tvg: {
+        id: string;
+        name: string;
+        language: string;
+        country: string;
+        url: string;
+        logo: string;
+        rec: string;
+    };
+    epgParams?: string;
+    timeshift?: string;
+    catchup?: {
+        type?: string;
+        source?: string;
+        days?: string;
+    };
+    http: {
+        referrer: string;
+        'user-agent': string;
+    };
+}

shared/constants.ts

@@ -0,0 +1,4 @@
+/**
+ * Id of the channel with favorite channels aggregated from all added playlists
+ */
+export const GLOBAL_FAVORITES_PLAYLIST_ID = 'GLOBAL_FAVORITES';

shared/playlist.utils.ts

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+import { Channel } from './channel.interface';
+import { GLOBAL_FAVORITES_PLAYLIST_ID } from './constants';
+import { Playlist } from './playlist.interface';
+
+/**
+ * Aggregates favorite channels as objects from all available playlists
+ * @param playlists all available playlists
+ * @returns an array with favorite channels from all playlists
+ */
+export function aggregateFavoriteChannels(playlists: Playlist[]): Channel[] {
+    const favorites = [];
+    playlists.forEach((playlist) => {
+        if (playlist.favorites?.length > 0) {
+            playlist.playlist.items.forEach((channel) => {
+                if (playlist.favorites.includes(channel.id)) {
+                    favorites.push(channel);
+                }
+            });
+        }
+    });
+    return favorites;
+}
+
+/**
+ * Creates a simplified playlist object which is used for global favorites
+ * @param channels channels list
+ * @returns simplified playlist object
+ */
+export function createFavoritesPlaylist(
+    channels: Channel[]
+): Partial<Playlist> {
+    return {
+        id: GLOBAL_FAVORITES_PLAYLIST_ID,
+        _id: GLOBAL_FAVORITES_PLAYLIST_ID,
+        count: channels.length,
+        playlist: {
+            items: channels,
+        },
+    };
+}