using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;
using System.Xml;
using System.Threading.Tasks;
using System.Xml.Serialization;
using BuzzGUI.Interfaces;
using BuzzGUI.Common;

namespace BuzzGUI.Common.Presets
{
	public class PresetDictionary : SerializableDictionary<Preset>
	{
		[XmlIgnore]
		public string Filename { get; set; }

		public PresetDictionary()
		{
		}

		public static void Init()
		{
			Task.Factory.StartNew(() =>
			{
				XmlSerializer.FromTypes(new[] { typeof(PresetDictionary), typeof(Preset), typeof(Preset.Parameter), typeof(Preset.Attribute) });
			});
		}

		public static PresetDictionary Load(IMachine machine, string filename)
		{
			if (Path.GetExtension(filename) == ".prs")
				return new PresetDictionary(machine, filename);
			else if (Path.GetExtension(filename) == ".xml")
				return LoadXML(machine, filename);

			return null;
		}

		PresetDictionary(IMachine machine, string filename)
		{
			var br = new BinaryReader(File.OpenRead(filename));

			int ver = br.ReadInt32();
			if (ver != 1) throw new Exception("wrong preset file version");

			string libname = br.ReadASCIIStringWithInt32Length();
			//if (libname.Replace("(Debug build)", "").Trim() != machine.DLL.Name)
			if (libname.Replace("(Debug build)", "").Trim() != machine.DLL.Info.Name.Replace("(Debug build)", "").Trim())
				throw new Exception("preset file is for a different machine");

			int count = br.ReadInt32();
			if (count < 0 || count > 65536) throw new Exception("invalid preset count");

			for (int i = 0; i < count; i++)
			{
				string name = br.ReadASCIIStringWithInt32Length();
				this[name] = new Preset(machine, br);
			}

		}

		static PresetDictionary LoadXML(IMachine machine, string filename)
		{
			var s = new XmlSerializer(typeof(PresetDictionary));

			var r = XmlReader.Create(filename);
			object o = s.Deserialize(r);
			r.Close();

			var pd = o as PresetDictionary;
			if (pd != null)
			{
				pd.Filename = filename;

				foreach (var x in pd)
				{
					if (x.Value.Machine == null)
						x.Value.Machine = machine.DLL.Name;
				}

			}
			return pd;
		}



		public void Save()
		{
			if (Filename == null) return;

			var ws = new XmlWriterSettings() { NamespaceHandling = System.Xml.NamespaceHandling.OmitDuplicates, NewLineOnAttributes = false, Indent = true };
			var w = XmlWriter.Create(Filename, ws);

			var s = new XmlSerializer(GetType());
			s.Serialize(w, this);


			w.Close();

		}

		public void Merge(PresetDictionary a)
		{
			foreach (var p in a)
			{
				if (!this.ContainsKey(p.Key))
					this[p.Key] = p.Value;
			}
		}
	}
}