using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using libxmltv.Interfaces;
using System.Xml.Linq;
using System.Reflection;

namespace libxmltv.Core
{
    [Serializable]
    internal class XMLTVChannel : XMLTVBase<XMLTVRuntimeInstance>, IXMLTVChannel
    {
        public XMLTVChannel() : base(null,XMLTVConstants.CHANNEL_ELEMENT)
        {
            Id = string.Empty;
            Number = 0;
            CallSign = string.Empty;
            Name = string.Empty;
        }
        public XMLTVChannel(XMLTVRuntimeInstance instance, XElement node)
            : base(instance, XMLTVConstants.CHANNEL_ELEMENT)
        {
            xmltv_logger.Verbose.Debug.WriteLine("Creating Instance of XMLTVChannel");
            Create(node);
            xmltv_logger.Verbose.Debug.WriteLine("Created Instance of XMLTVChannel");
            UpdateInstance();            
        }
        #region IXMLTVChannel members
        public string Id { get; private set; }
        public int Number { get; private set; }
        public string CallSign { get; private set; }
        public string Name { get; private set; }
        #endregion
        public override string ToString()
        {
            return string.Format("{0}: {1} {2} ({3})", Id, Number, Name, CallSign);
        }

        private void UpdateInstance()
        {
            bool found_field = false;
            var instance_type = this.GetInstance().GetType();
            var fields = instance_type.GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance);
            foreach (var field in fields)
            {
                if (field.FieldType == typeof(List<IXMLTVChannel>))
                {
                    found_field = true;
                    try
                    {
                        xmltv_logger.Verbose.Debug.WriteLine("Updating instance with channel information: {0}", this.ToString());
                        //field.SetValue(this.GetInstance(), new List<IXMLTVChannel>() { this });

                        var list = (List<IXMLTVChannel>)field.GetValue(this.GetInstance());
                        list.Add(this);
                        field.SetValue(this.GetInstance(), list);
                        break;
                    }
                    catch (Exception ex)
                    {
                        xmltv_logger.Verbose.Error.WriteLine("Unable to update instance with channel information.");
                        xmltv_logger.Verbose.Error.WriteLine(ex.ToString());
                    }
                }
            }
            if (!found_field)
            {
                xmltv_logger.Verbose.Error.WriteLine("Unable to update instance with channel information.");
            }
        }

        private void Create(XElement node)
        {
            // get the channel id
            Id = node.Attribute(XMLTVConstants.Channels.ChannelId).Value;
            xmltv_logger.Verbose.Debug.WriteLine("\tchannel_id: {0}", Id);
            var names = node.Descendants(XMLTVConstants.Channels.ChannelDisplayName).ToList();
            Number = Convert.ToInt32(names[1].Value);
            xmltv_logger.Verbose.Debug.WriteLine("\tchannel_number: {0}", Number);
            CallSign = names[2].Value;
            xmltv_logger.Verbose.Debug.WriteLine("\tchannel_callsign: {0}", CallSign);
            Name = names[3].Value;
            xmltv_logger.Verbose.Debug.WriteLine("\tchannel_name: {0}", Name);
        }
    }

}