Add ability to set games/roms as favouriteFixes #49

* Add ability to set games/roms as favourite
Fixes #49

gaseous-server/Classes/Favourites.cs

@@ -0,0 +1,58 @@
+using IGDB.Models;
+
+namespace gaseous_server.Classes
+{
+    public class Favourites
+    {
+        public bool GetFavourite(string userid, long GameId)
+        {
+            Database db = new Database(Database.databaseType.MySql, Config.DatabaseConfiguration.ConnectionString);
+            string sql = "SELECT * FROM Favourites WHERE UserId=@userid AND GameId=@gameid";
+            Dictionary<string, object> dbDict = new Dictionary<string, object>{
+                { "userid", userid },
+                { "gameid", GameId}
+            };
+
+            if (db.ExecuteCMD(sql, dbDict).Rows.Count > 0)
+            {
+                return true;
+            }
+            else
+            {
+                return false;
+            }
+        }
+
+        public bool SetFavourite(string userid, long GameId, bool Favourite)
+        {
+            bool CurrentFavourite = GetFavourite(userid, GameId);
+            if (CurrentFavourite == Favourite)
+            {
+                return Favourite;
+            }
+            else
+            {
+                Database db = new Database(Database.databaseType.MySql, Config.DatabaseConfiguration.ConnectionString);
+                string sql;
+                Dictionary<string, object> dbDict = new Dictionary<string, object>{
+                    { "userid", userid },
+                    { "gameid", GameId}
+                };
+
+                if (CurrentFavourite == true)
+                {
+                    // delete existing value
+                    sql = "DELETE FROM Favourites WHERE UserId=@userid AND GameId=@gameid";
+                }
+                else
+                {
+                    // insert new value
+                    sql = "INSERT INTO Favourites (UserId, GameId) VALUES (@userid, @gameid)";
+                }
+                db.ExecuteNonQuery(sql, dbDict);
+
+                return Favourite;
+            }
+        }
+    }
+}