using System;
using System.Linq;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Reflection;
using System.Collections.Generic;
using System.IO;

using BizHawk.Emulation.DiscSystem;

//cue format preferences notes

//pcejin -
//does not like session commands
//it can handle binpercue
//it seems not to be able to handle binpertrack, or maybe i am doing something wrong (still havent ruled it out)

namespace BizHawk.Client.DiscoHawk
{
	static class Program
	{
		static Program()
		{
#if WINDOWS
			//http://www.codeproject.com/Articles/310675/AppDomain-AssemblyResolve-Event-Tips
			// this will look in subdirectory "dll" to load pinvoked stuff
			string dllDir = System.IO.Path.Combine(GetExeDirectoryAbsolute(), "dll");
			SetDllDirectory(dllDir);

			//but before we even try doing that, whack the MOTW from everything in that directory (thats a dll)
			//otherwise, some people will have crashes at boot-up due to .net security disliking MOTW.
			//some people are getting MOTW through a combination of browser used to download bizhawk, and program used to dearchive it
			WhackAllMOTW(dllDir);

			//in case assembly resolution fails, such as if we moved them into the dll subdiretory, this event handler can reroute to them
			AppDomain.CurrentDomain.AssemblyResolve += new ResolveEventHandler(CurrentDomain_AssemblyResolve);
#endif
		}

		[STAThread]
		static void Main(string[] args)
		{
			SubMain(args);
		}

		//NoInlining should keep this code from getting jammed into Main() which would create dependencies on types which havent been setup by the resolver yet... or something like that
		[DllImport("user32.dll", SetLastError = true)]
		public static extern bool ChangeWindowMessageFilterEx(IntPtr hWnd, uint msg, ChangeWindowMessageFilterExAction action, ref CHANGEFILTERSTRUCT changeInfo);
		static void SubMain(string[] args)
		{
#if WINDOWS
			ChangeWindowMessageFilter(WM_DROPFILES, ChangeWindowMessageFilterFlags.Add);
			ChangeWindowMessageFilter(WM_COPYDATA, ChangeWindowMessageFilterFlags.Add);
			ChangeWindowMessageFilter(0x0049, ChangeWindowMessageFilterFlags.Add);
#endif

			var ffmpegPath = Path.Combine(GetExeDirectoryAbsolute(), "ffmpeg.exe");
			if (!File.Exists(ffmpegPath))
				ffmpegPath = Path.Combine(Path.Combine(GetExeDirectoryAbsolute(), "dll"), "ffmpeg.exe");
			FFMpeg.FFMpegPath = ffmpegPath;
			AudioExtractor.FFmpegPath = ffmpegPath;
			new DiscoHawk().Run(args);
		}


		public static string GetExeDirectoryAbsolute()
		{
			var uri = new Uri(Assembly.GetEntryAssembly().GetName().CodeBase);
			string module = uri.LocalPath + System.Web.HttpUtility.UrlDecode(uri.Fragment);
			return Path.GetDirectoryName(module);
		}

		static Assembly CurrentDomain_AssemblyResolve(object sender, ResolveEventArgs args)
		{
			lock (AppDomain.CurrentDomain)
			{
				var asms = AppDomain.CurrentDomain.GetAssemblies();
				foreach (var asm in asms)
					if (asm.FullName == args.Name)
						return asm;

				//load missing assemblies by trying to find them in the dll directory
				string dllname = new AssemblyName(args.Name).Name + ".dll";
				string directory = Path.Combine(GetExeDirectoryAbsolute(), "dll");
				string fname = Path.Combine(directory, dllname);
				if (!File.Exists(fname)) return null;
				//it is important that we use LoadFile here and not load from a byte array; otherwise mixed (managed/unamanged) assemblies can't load
				return Assembly.LoadFile(fname);
			}
		}

		//declared here instead of a more usual place to avoid dependencies on the more usual place
#if WINDOWS
		[DllImport("kernel32.dll", SetLastError = true)]
		static extern bool SetDllDirectory(string lpPathName);

		[DllImport("kernel32.dll", EntryPoint = "DeleteFileW", SetLastError = true, CharSet = CharSet.Unicode, ExactSpelling = true)]
		static extern bool DeleteFileW([MarshalAs(UnmanagedType.LPWStr)]string lpFileName);
		static void RemoveMOTW(string path)
		{
			DeleteFileW(path + ":Zone.Identifier");
		}

		//for debugging purposes, this is provided. when we're satisfied everyone understands whats going on, we'll get rid of this
		[DllImportAttribute("kernel32.dll", EntryPoint = "CreateFileW")]
		public static extern System.IntPtr CreateFileW([InAttribute()] [MarshalAsAttribute(UnmanagedType.LPWStr)] string lpFileName, int dwDesiredAccess, int dwShareMode, [InAttribute()] int lpSecurityAttributes, int dwCreationDisposition, int dwFlagsAndAttributes, [InAttribute()] int hTemplateFile);
		static void ApplyMOTW(string path)
		{
			int generic_write = 0x40000000;
			int file_share_write = 2;
			int create_always = 2;
			var adsHandle = CreateFileW(path + ":Zone.Identifier", generic_write, file_share_write, 0, create_always, 0, 0);
			using (var sfh = new Microsoft.Win32.SafeHandles.SafeFileHandle(adsHandle, true))
			{
				var adsStream = new System.IO.FileStream(sfh, FileAccess.Write);
				StreamWriter sw = new StreamWriter(adsStream);
				sw.Write("[ZoneTransfer]\r\nZoneId=3");
				sw.Flush();
				adsStream.Close();
			}
		}

		static void WhackAllMOTW(string dllDir)
		{
			var todo = new Queue<DirectoryInfo>(new[] { new DirectoryInfo(dllDir) });
			while (todo.Count > 0)
			{
				var di = todo.Dequeue();
				foreach (var disub in di.GetDirectories()) todo.Enqueue(disub);
				foreach (var fi in di.GetFiles("*.dll"))
					RemoveMOTW(fi.FullName);
			}

		}
#endif

		private const UInt32 WM_DROPFILES = 0x0233;
		private const UInt32 WM_COPYDATA = 0x004A;
		[DllImport("user32")]
		public static extern bool ChangeWindowMessageFilter(uint msg, ChangeWindowMessageFilterFlags flags);
		public enum ChangeWindowMessageFilterFlags : uint
		{
			Add = 1, Remove = 2
		};
		public enum MessageFilterInfo : uint
		{
			None = 0, AlreadyAllowed = 1, AlreadyDisAllowed = 2, AllowedHigher = 3
		};

		public enum ChangeWindowMessageFilterExAction : uint
		{
			Reset = 0, Allow = 1, DisAllow = 2
		};

		[StructLayout(LayoutKind.Sequential)]
		public struct CHANGEFILTERSTRUCT
		{
			public uint size;
			public MessageFilterInfo info;
		}
	}

	class DiscoHawk
	{
		public void Run(string[] args)
		{
			bool gui = true;
			foreach (var arg in args)
			{
				if (arg.ToUpper() == "COMMAND") gui = false;
			}

			if (gui)
			{
				var dialog = new MainDiscoForm();
				dialog.ShowDialog();
				return;
			}
		}
	}

}

//code to test ECM:
//static class test
//{
//  public static void Shuffle<T>(this IList<T> list, Random rng)
//  {
//    int n = list.Count;
//    while (n > 1)
//    {
//      n--;
//      int k = rng.Next(n + 1);
//      T value = list[k];
//      list[k] = list[n];
//      list[n] = value;
//    }
//  }

//  public static void Test()
//  {
//    var plaindisc = BizHawk.DiscSystem.Disc.FromCuePath("d:\\ecmtest\\test.cue", BizHawk.MainDiscoForm.GetCuePrefs());
//    var ecmdisc = BizHawk.DiscSystem.Disc.FromCuePath("d:\\ecmtest\\ecmtest.cue", BizHawk.MainDiscoForm.GetCuePrefs());

//    //var prefs = new BizHawk.DiscSystem.CueBinPrefs();
//    //prefs.AnnotateCue = false;
//    //prefs.OneBlobPerTrack = false;
//    //prefs.ReallyDumpBin = true;
//    //prefs.SingleSession = true;
//    //prefs.DumpToBitbucket = true;
//    //var dump = ecmdisc.DumpCueBin("test", prefs);
//    //dump.Dump("test", prefs);

//    //var prefs = new BizHawk.DiscSystem.CueBinPrefs();
//    //prefs.AnnotateCue = false;
//    //prefs.OneBlobPerTrack = false;
//    //prefs.ReallyDumpBin = true;
//    //prefs.SingleSession = true;
//    //var dump = ecmdisc.DumpCueBin("test", prefs);
//    //dump.Dump(@"D:\ecmtest\myout", prefs);

//    int seed = 102;

//    for (; ; )
//    {
//      Console.WriteLine("running seed {0}", seed);
//      Random r = new Random(seed);
//      seed++;

//      byte[] chunkbuf_corlet = new byte[2352 * 20];
//      byte[] chunkbuf_mine = new byte[2352 * 20];
//      int length = ecmdisc.LBACount * 2352;
//      int counter = 0;
//      List<Tuple<int, int>> testChunks = new List<Tuple<int, int>>();
//      while (counter < length)
//      {
//        int chunk = r.Next(1, 2352 * 20);
//        if (r.Next(20) == 0)
//          chunk /= 100;
//        if (r.Next(40) == 0)
//          chunk = 0;
//        if (counter + chunk > length)
//          chunk = length - counter;
//        testChunks.Add(new Tuple<int, int>(counter, chunk));
//        counter += chunk;
//      }
//      testChunks.Shuffle(r);

//      for (int t = 0; t < testChunks.Count; t++)
//      {
//        //Console.WriteLine("skank");
//        var item = testChunks[t];
//        //Console.WriteLine("chunk {0} of {3} is {1} bytes @ {2:X8}", t, item.Item2, item.Item1, testChunks.Count);
//        plaindisc.ReadLBA_2352_Flat(item.Item1, chunkbuf_corlet, 0, item.Item2);
//        ecmdisc.ReadLBA_2352_Flat(item.Item1, chunkbuf_mine, 0, item.Item2);
//        for (int i = 0; i < item.Item2; i++)
//          if (chunkbuf_corlet[i] != chunkbuf_mine[i])
//          {
//            Debug.Assert(false);
//          }
//      }
//    }
//  }
//}