[gnome-games] collection: Introduce CollectionManager

[Alexander Mikhaylenko <alexm src gnome org>]

commit 64eb88bc59de2976b79f08bf905a45dbbc2064f6
Author: Neville <nevilleantony98 gmail com>
Date:   Thu Jun 18 21:29:45 2020 +0530

    collection: Introduce CollectionManager
    
    CollectionManager will be used to handle the creation and management
    of collections. It consists of a HashTable which stores all the
    discovered collections, a FavoriteCollection which is a non-user
    collection for managing favorite games.
    
    Provides a toggle_favorite() which adds and removes a game depending
    on the list of games

 src/collection/collection-manager.vala | 46 ++++++++++++++++++++++++++++++++++
 src/meson.build                        |  1 +
 2 files changed, 47 insertions(+)
---
diff --git a/src/collection/collection-manager.vala b/src/collection/collection-manager.vala
new file mode 100644
index 00000000..93657250
--- /dev/null
+++ b/src/collection/collection-manager.vala
@@ -0,0 +1,46 @@
+// This file is part of GNOME Games. License: GPL-3.0+.
+
+private class Games.CollectionManager : Object {
+       public signal void collection_added (Collection collection);
+       public signal void collection_removed (Collection collection);
+
+       private HashTable<string, Collection> collections;
+       private Database database;
+
+       private FavoritesCollection favorites_collection;
+
+       public CollectionManager (Database database) {
+               this.database = database;
+               collections = new HashTable<string, Collection> (str_hash, str_equal);
+
+               add_favorites_collection ();
+
+               collections.foreach ((key, val) => {
+                       val.load ();
+               });
+       }
+
+       public void toggle_favorite (Game[] games) {
+               var is_all_favorite = true;
+               foreach (var game in games) {
+                       if (!game.is_favorite) {
+                               is_all_favorite = false;
+                               break;
+                       }
+               }
+
+               if (is_all_favorite)
+                       favorites_collection.remove_games (games);
+               else
+                       favorites_collection.add_games (games);
+       }
+
+       private void add_favorites_collection () {
+               favorites_collection = new FavoritesCollection (database);
+               collections[favorites_collection.get_id ()] = favorites_collection;
+               Idle.add (() => {
+                       collection_added (favorites_collection);
+                       return Source.REMOVE;
+               });
+       }
+}
diff --git a/src/meson.build b/src/meson.build
index 71610442..8a0c05ae 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -14,6 +14,7 @@ vala_sources = [
   'collection/collection.vala',
   'collection/collection-model.vala',
   'collection/favorites-collection.vala',
+  'collection/collection-manager.vala',
 
   'command/command-error.vala',
   'command/command-runner.vala',