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namespace Majesty_of_Omega.Logic.GameConfiguration
{
    /// <summary>
    /// The game manager saves and loads games to the My Games folder of majesty of omega
    /// </summary>
    public class SaveGameManager
    {
        /// <summary>
        /// the standard save game extension
        /// </summary>
        private const string saveGameExtension = ".moosav";

        /// <summary>
        /// this value is true, if the SaveGameManager is operating in unit test modes.
        /// the variable changes the behavior of the MooGameFolder property
        /// </summary>
        private readonly bool _testMode;

        /// <summary>
        /// Initialize a new instance of  <see cref="SaveGameManager"/> class.
        /// </summary>
        public SaveGameManager()
        {
        }

        /// <summary>
        /// Initialize a new instance of <see cref="SaveGameManager"/> class.
        /// </summary>
        /// <param name="testMode">if set to <c>true</c> then the SaveGameManager is operating in unit test mode.</param>
        /// <remarks>the variable changes the behavior of the MooGameFolder property</remarks>
        public SaveGameManager(bool testMode)
        {
            _testMode = testMode;
        }

        /// <summary>
        /// Gets the last games, which resides int the my games folder of majesty of omega
        /// </summary>
        /// <value>The last games.</value>
        public List<SaveGameInfo> LastGamesInMooGameFolder
        {
            get
            {
                var gameInfos = from file in Directory.GetFiles(MooGameFolder)
                                orderby file
                                select LoadGameInfo(file);
                return new List<SaveGameInfo>(gameInfos);
            }
        }

        /// <summary>
        /// Gets the Majesty of Omega save game folder.
        /// </summary>
        /// <value>The moo game folder.</value>
        public string MooGameFolder
        {
            get
            {
                var mooGameFolder = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) +
                                    @"\My Games\Majesty of Omega";
                if (_testMode)
                {
                    mooGameFolder = Path.GetTempPath() + @"\Majesty of Omega";
                }
                if (!Directory.Exists(mooGameFolder))
                {
                    Directory.CreateDirectory(mooGameFolder);
                }
                return mooGameFolder;
            }
        }

        /// <summary>
        /// Saves the specified game to a file stream.
        /// </summary>
        /// <param name="game">The game.</param>
        /// <param name="path">The full path to the file system or a simple file system compatible game name.</param>
        public void Save(SaveGame game, string path)
        {
            Require.IsNotNull(game);
            // Assures the correct save game extension
            path = Path.ChangeExtension(path, saveGameExtension);

            // check, if the path contains a directory. if not, assign the standard
            // save game folder
            var directoryName = Path.GetDirectoryName(path);
            if (string.IsNullOrEmpty(directoryName))
            {
                path = Path.Combine(MooGameFolder, path);
            }

            var gameInfo = new SaveGameInfo
                               {
                                   GameName = Path.GetFileNameWithoutExtension(path),
                                   TurnNumber = game.TurnNumber,
                                   Time = DateTime.Now
                               };
            var fStream = new FileStream(path, FileMode.Create);

            // Create our binary formatter object.
            var formatter = new BinaryFormatter();

            // Serialize our data.
            formatter.Serialize(fStream, gameInfo);
            formatter.Serialize(fStream, game);

            // Close our data file.
            fStream.Close();
        }