using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using libxmltv.Interfaces;
using System.IO;
using Enterprise.Logging;
using System.Xml.Linq;

namespace libxmltv.Core
{
    /// <summary>
    /// Main class: Creates the XMLTV Loader
    /// </summary>
    public static class XMLTV
    {
        public static object CreateLoader(string xml_file)
        {
            XMLTV_LOGGER.Initialize();
            XMLTV_LOADER loader = new XMLTV_LOADER(xml_file);
            return loader;
        }
        public static void Test(object xmltv)
        {
            if (!VerifyInstance<XMLTV_LOADER>(xmltv)) { return; }
        }


        private static bool VerifyInstance<T>(object xmltv) where T : class
        {
            try
            {
                if (xmltv == null) { return false; }
                T t = (xmltv as T);
                if (t == null) { throw new InvalidCastException(string.Format("Unable to cast type: {0} to {1}", xmltv.GetType().Name, typeof(T).Name)); }
                else { return true; }
            }
            catch (Exception ex)
            {
                throw new InvalidCastException(string.Format("Unable to cast type: {0} to {1}", xmltv.GetType().Name, typeof(T).Name), ex); 
            }
        }
    }

    internal class XMLTV_LOADER : IXMLTV_LOADER
    {
        private string xmlfile = string.Empty;
        public XMLTV_LOADER(string xml_file)
        {
            xmlfile = xml_file;
            LoadXml();
        }
        #region IXMLTV_LOADER
        public FileInfo XmlFile { get { return new FileInfo(xmlfile); } }
        #endregion

        private void LoadXml()
        {
            XMLTV_LOGGER.Log.Info.WriteLine("Loading XMLTV File: {0}", XmlFile.Name);
            //XMLTV_LOGGER.Log.Warn.WriteLine("XML File Loading has not been implemented yet!");
            try
            {
                XDocument doc = XDocument.Load(XmlFile.FullName);
            }
            catch (Exception ex)
            {
                XMLTV_LOGGER.Log.Error.WriteLine("Failed to load XMLTV File: {0}", XmlFile.Name);
                XMLTV_LOGGER.Log.Error.WriteLine(ex.GetBaseException().ToString());
            }
        }
    }
}