1 files changed, 88 insertions, 0 deletions
diff --git a/V3/Data/Internal/SaveGameManager.cs b/V3/Data/Internal/SaveGameManager.cs
new file mode 100644
index 0000000..1c52b50
--- /dev/null
+++ b/V3/Data/Internal/SaveGameManager.cs
@@ -0,0 +1,88 @@
+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Runtime.Serialization;
+using System.Xml.Serialization;
+
+namespace V3.Data.Internal
+{
+    /// <summary>
+    /// Default implementation if ISaveGameManager.
+    /// </summary>
+    // ReSharper disable once ClassNeverInstantiated.Global
+    internal sealed class SaveGameManager : ISaveGameManager
+    {
+        private readonly IPathManager mPathManager;
+
+        private const int CurrentVersion = 1;
+        private readonly XmlSerializer mFormatter = new XmlSerializer(typeof(SaveGame));
+
+        /// <summary>
+        /// Creates a new SaveGameManager. The save game directory must already
+        /// be created.
+        /// </summary>
+        public SaveGameManager(IPathManager pathManager)
+        {
+            mPathManager = pathManager;
+        }
+
+        /// <summary>
+        /// Creates and persists a new save game of the given data with the
+        /// title.
+        /// </summary>
+        /// <param name="gameState">the data to store</param>
+        public void CreateSaveGame(GameState gameState)
+        {
+            var saveGame = new SaveGame(DateTime.Now, CurrentVersion, gameState);
+            var fileName = GetUniqueFileName();
+            var stream = new FileStream(fileName, FileMode.Create, FileAccess.Write);
+            mFormatter.Serialize(stream, saveGame);
+            stream.Close();
+        }
+
+        /// <summary>
+        /// Loads all available save games and returns them ordered by the
+        /// creation date.
+        /// </summary>
+        /// <returns>a list of all available save games, orderd by creation
+        /// data</returns>
+        public List<ISaveGame> GetSaveGames()
+        {
+            var saveGames = new List<ISaveGame>();
+            foreach (var file in Directory.GetFiles(mPathManager.SaveGameDirectory))
+            {
+                var stream = new FileStream(file, FileMode.Open, FileAccess.Read);
+                try
+                {
+                    var saveGame = (ISaveGame)mFormatter.Deserialize(stream);
+                    if (saveGame.Version == CurrentVersion)
+                        saveGames.Add(saveGame);
+                }
+                catch (SerializationException)
+                {
+                    // ignore so far
+                }
+                stream.Close();
+            }
+            saveGames.Sort();
+            return saveGames;
+        }
+
+        private string GetUniqueFileName()
+        {
+            var index = 1;
+            var fileName = GetFileName(index);
+            while (File.Exists(fileName))
+            {
+                index++;
+                fileName = GetFileName(index);
+            }
+            return fileName;
+        }
+
+        private string GetFileName(int index)
+        {
+            return $"{mPathManager.SaveGameDirectory}/{index:000}.xml";
+        }
+    }
+}