using Midi;
using Midi.Devices;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Text.Encodings.Web;
using System.Text.Json;
using System.Text.Unicode;
using System.Threading;

namespace VirtualDJ_MidiDeviceBridge
{
	internal static class Globals
	{
		public static string ConfigPath = "";
		public static MidiConfig Config = MidiConfig.GetDefaultConfig();

		public static bool ShiftKeyHeld = false;
		public static IInputDevice MidiInDevice = null;
		public static IOutputDevice MidiOutDevice = null;

		public static object UdpLock = new object();
		public static UdpClient UdpClient = new UdpClient();

		public static FileSystemWatcher configWatcher = null;

		static Globals()
		{
			UdpClient.Client.SendTimeout = 100;
			UdpClient.Client.ReceiveTimeout = 100;
		}

		public static void UserReadConfig()
		{
			try
			{
				if (File.Exists(ConfigPath))
				{
					string json = File.ReadAllText(ConfigPath);
					Config = JsonSerializer.Deserialize<MidiConfig>(json);
				}
				else
				{
					Console.WriteLine($"Path doesn't point to a file. Press enter to create a default config file at '{ConfigPath}'");
					Console.ReadKey();
					File.WriteAllBytes(ConfigPath, JsonSerializer.SerializeToUtf8Bytes(Config, new JsonSerializerOptions 
					{ 
						WriteIndented = true,
						Encoder = JavaScriptEncoder.Create(UnicodeRanges.All)
					}));
					Console.WriteLine("Wrote default config!");
				}
			}
			catch
			{
				Console.WriteLine("Failed to read config file!");
			}
		}

		public static void StartConfigWatcher()
		{
			configWatcher = new FileSystemWatcher
			{
				Path = Path.GetDirectoryName(Path.GetFullPath(ConfigPath)),
				Filter = Path.GetFileName(Path.GetFullPath(ConfigPath)),
				NotifyFilter = NotifyFilters.LastWrite
			};

			configWatcher.Changed += ConfigWatcher_Changed;

			configWatcher.EnableRaisingEvents = true;
		}

		private static void ConfigWatcher_Changed(object sender, FileSystemEventArgs e)
		{
			if (e.ChangeType != WatcherChangeTypes.Changed)
				return;

			Thread.Sleep(100);

			UserReadConfig();
			Console.WriteLine("Config reloaded!");
		}

		public static string SendCommand(string cmd)
		{
			lock (UdpLock)
			{
				IPEndPoint remote = new IPEndPoint(IPAddress.Loopback, 54000);
				//Console.WriteLine($"Sending message: {message}");

				byte[] data = Encoding.ASCII.GetBytes(cmd);

				UdpClient.Send(data, data.Length, remote);
				data = UdpClient.Receive(ref remote);

				string result = Encoding.ASCII.GetString(data);
				//Console.WriteLine($"Received message: {result}");

				if (result.Contains("Error"))
				{
					Console.WriteLine($"Command resulted in error!");
					Console.WriteLine($"Command: {cmd}");
					Console.WriteLine($"Error: {result}");
				}

				return result;
			}
		}

		public static void UserSelectDevice()
		{
			DeviceManager.UpdateInputDevices();
			DeviceManager.UpdateOutputDevices();

			Console.WriteLine("Devices: ");
			int index = 0;
			foreach(var device in DeviceManager.InputDevices)
			{
				Console.WriteLine($"\t{device.Name} [{index}]");
				index++;
			}

			Console.WriteLine();

			while (true)
			{
				Console.Write("Please select a device: ");

				int selectedIndex;
				if (!Int32.TryParse(Console.ReadLine(), out selectedIndex))
				{
					Console.WriteLine("Not a number");
					continue;
				}

				if (selectedIndex < 0 || selectedIndex > DeviceManager.InputDevices.Count - 1)
				{
					Console.WriteLine($"Invalid index {selectedIndex}");
					continue;
				}

				MidiInDevice = DeviceManager.InputDevices[selectedIndex];
				MidiOutDevice = DeviceManager.OutputDevices.Where(dev => dev.Name == MidiInDevice.Name).FirstOrDefault();

				Console.Write($"Trying to claim device {MidiInDevice.Name}... ");

				try
				{
					MidiInDevice.Open();
					MidiOutDevice.Open();
				}
				catch
				{
					Console.WriteLine("Failed! Is the device busy?");
					continue;
				}


				MidiOutDevice.SendSysEx(new byte[] { 0x90, 0x20, 0x00 });

				Console.WriteLine("Success!");
				break;
			}
		}
	}
}