namespace JDSongConverter.Converters
{
    /// <summary>
    /// The class that has the responsability to convert a set of songs
    /// </summary>
    public class ConverterManager
    {
        #region Variables

        public static ConverterManager Instance = new ConverterManager();
        private static readonly Jd1ToJd2016Converter _jd1ToJd2016Converter = new Jd1ToJd2016Converter();
        private static readonly Jd2ToJd2016Converter _jd2ToJd2016Converter = new Jd2ToJd2016Converter();
        private static readonly Jd3ToJd2016Converter _jd3ToJd2016Converter = new Jd3ToJd2016Converter();
        private static readonly Jd4ToJd2016Converter _jd4ToJd2015Converter = new Jd4ToJd2016Converter();
        private static readonly Jd5EngineToJd2016Converter _jd5EngineToJd2016Converter = new Jd5EngineToJd2016Converter();
        private static readonly Jd5CatalogToJd2016Converter _jd5CatalogToJd2016Converter = new Jd5CatalogToJd2016Converter();
        private static readonly JD2015ToJd2016Converter _jd2015ToJd2016Converter = new JD2015ToJd2016Converter();
        private static readonly Jd2016Updater _jd2016Updater = new Jd2016Updater();
        private static readonly Jd2016Downgrader _jd2016Downgrader = new Jd2016Downgrader();
        private static readonly Jd2016ToJd5Downgrader _jd2016ToJd5Downgrader = new Jd2016ToJd5Downgrader();

        #endregion
        
        #region Constructor

        private ConverterManager() {}

        #endregion
        
        #region Methods


        public static Converter GetConverter(JDSongVersion srcVersion, JDSongVersion destination, JDFolderLayout srcFolderLayout = JDFolderLayout.Unknown)
        {
            if (srcVersion == JDSongVersion.JD1 && destination == JDSongVersion.JD2016)
                return _jd1ToJd2016Converter;
            if (srcVersion == JDSongVersion.JD2 && destination == JDSongVersion.JD2016)
                return _jd2ToJd2016Converter;
            if (srcVersion == JDSongVersion.JD3 && destination == JDSongVersion.JD2016)
                return _jd3ToJd2016Converter;
            if (srcVersion == JDSongVersion.JD4 && destination == JDSongVersion.JD2016)
                return _jd4ToJd2015Converter;
            if (srcVersion == JDSongVersion.JD5 && destination == JDSongVersion.JD2016)
            {
                if (srcFolderLayout == JDFolderLayout.Engine)
                {
                    return _jd5EngineToJd2016Converter;
                }
                else if (srcFolderLayout == JDFolderLayout.CatalogProd)
                {
                    return _jd5CatalogToJd2016Converter;
                }
            }
            if (srcVersion == JDSongVersion.JD2015 && destination == JDSongVersion.JD2016)
                return _jd2015ToJd2016Converter;
            if (srcVersion == JDSongVersion.JD2016 && destination == JDSongVersion.JD2016)
                return _jd2016Updater;
            if (srcVersion == JDSongVersion.JD2016 && destination == JDSongVersion.JD2015)
                return _jd2016Downgrader;
            if (srcVersion == JDSongVersion.JD2016 && destination == JDSongVersion.JD5)
                return _jd2016ToJd5Downgrader;
            return null;
        }

        #endregion
    }
}