1 files changed, 65 insertions, 0 deletions
diff --git a/V3/Data/Internal/SaveGame.cs b/V3/Data/Internal/SaveGame.cs
new file mode 100644
index 0000000..9ff3586
--- /dev/null
+++ b/V3/Data/Internal/SaveGame.cs
@@ -0,0 +1,65 @@
+using System;
+
+namespace V3.Data.Internal
+{
+    // TODO: once the game state is getting larger, we have to separate the
+    // save game metadata from the game state.
+
+    /// <summary>
+    /// A save game that has a timestamp and a title, and that can store
+    /// the game state.
+    /// </summary>
+    [Serializable]
+    public sealed class SaveGame : ISaveGame
+    {
+        /// <summary>
+        /// The creation time of this save game in local time.
+        /// </summary>
+        public DateTime Timestamp { get; set; }
+
+        /// <summary>
+        /// The compability version of this save game.
+        /// </summary>
+        public int Version { get; set; }
+
+        /// <summary>
+        /// The data stored in this save game.
+        /// </summary>
+        public GameState GameState { get; set; }
+
+        /// <summary>
+        /// Empty constructor for serialization.
+        /// </summary>
+        private SaveGame()
+        {
+        }
+
+        /// <summary>
+        /// Creates a new save game from the given data.
+        /// </summary>
+        /// <param name="timestamp">the creation time of the save game</param>
+        /// <param name="version">the compability version of the save game</param>
+        /// <param name="gameState">the game state to store in the save game</param>
+        internal SaveGame(DateTime timestamp, int version, GameState gameState)
+        {
+            Timestamp = timestamp;
+            Version = version;
+            GameState = gameState;
+        }
+
+        /// <summary>
+        /// Compares this save game object to another save game object based
+        /// on the creation time.
+        /// </summary>
+        /// <param name="saveGame">the save game to compare this save game
+        /// with</param>
+        /// <returns>a value less than zero if this save game has been saved
+        /// before the given save game, zero if they have been saved at the
+        /// same time and a value greater than zero if the given save game has
+        /// been saved before the given one</returns>
+        public int CompareTo(ISaveGame saveGame)
+        {
+            return Timestamp.CompareTo(saveGame.Timestamp);
+        }
+    }
+}