using Midi.Devices;
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Threading;


namespace VirtualDJ_MidiDeviceBridge
{
	internal static class MidiManager
	{
		public static void SetupDevice()
		{
			Globals.MidiInDevice.NoteOn += MidiDevice_NoteOn;
			Globals.MidiInDevice.NoteOff += MidiDevice_NoteOff;
			Globals.MidiInDevice.ControlChange += MidiDevice_ControlChange;
		}

		private static void MidiDevice_NoteOn(Midi.Messages.NoteOnMessage msg)
		{
			string key = $"NOTEON_{(int)(msg.Pitch)}";

			if ((int)msg.Pitch == Globals.Config.ShiftNoteId)
			{
				if (Globals.Config.ToggleShift && Globals.ShiftKeyHeld)
					Globals.ShiftKeyHeld = false;
				else
					Globals.ShiftKeyHeld = true;
			}

			string cmd = null;
			Globals.Config.GetActiveMidiInCommands(Globals.ShiftKeyHeld).TryGetValue(key, out cmd);

			if (cmd == null)
			{
				Console.WriteLine($"Unbound midi event: {key} (shift: {Globals.ShiftKeyHeld})");
				return;
			}

			Globals.SendCommand($"0:(command){cmd}");
		}

		private static void MidiDevice_NoteOff(Midi.Messages.NoteOffMessage msg)
		{
			string key = $"NOTEOFF_{(int)(msg.Pitch)}";

			if ((int)msg.Pitch == Globals.Config.ShiftNoteId)
			{
				if (!Globals.Config.ToggleShift)
					Globals.ShiftKeyHeld = false;

				Globals.MidiOutDevice.SilenceAllNotes();
			}

			string cmd = null;
			Globals.Config.GetActiveMidiInCommands(Globals.ShiftKeyHeld).TryGetValue(key, out cmd);

			if (cmd == null)
			{
				Console.WriteLine($"Unbound midi event: {key} (shift: {Globals.ShiftKeyHeld})");
				return;
			}

			Globals.SendCommand($"0:(command){cmd}");
		}

		private static void MidiDevice_ControlChange(Midi.Messages.ControlChangeMessage msg)
		{
			string key = $"CONTROL_{(int)(msg.Control)}";
			string cmd = null;

			float normalizedValue = msg.Value / 128.0f * 100f;

			Globals.Config.GetActiveMidiInCommands(Globals.ShiftKeyHeld).TryGetValue(key, out cmd);

			if (cmd == null)
			{
				Console.WriteLine($"Unbound midi event: {key} (value: {normalizedValue.ToString(CultureInfo.InvariantCulture)}) (shift: {Globals.ShiftKeyHeld})");
				return;
			}

			cmd = cmd.Replace("%val%", normalizedValue.ToString(CultureInfo.InvariantCulture) + "%");
			Globals.SendCommand($"0:(command){cmd}");
		}

		public static void Work()
		{
			Globals.MidiInDevice.StartReceiving(null);

			while (true)
			{
				Thread.Sleep(100);

				foreach(var cmd in Globals.Config.GetActiveMidiOutShiftCommandsSysEx(Globals.ShiftKeyHeld))
				{
					try
					{
						string result = Globals.SendCommand($"1:(string){cmd}");
						result = result.Substring(2); //skip 0:
													  //result = result.Substring(1, result.Length - 3); //skip [ ... ]

						string[] values = result.Split(',');
						byte[] sysExBytes = new byte[values.Length];

						for (int i = 0; i < values.Length; i++)
						{
							if (values[i].StartsWith("0x"))
								sysExBytes[i] = byte.Parse(values[i].Substring(2), NumberStyles.HexNumber);
							else
								sysExBytes[i] = byte.Parse(values[i], NumberStyles.Integer);
						}

						Globals.MidiOutDevice.SendSysEx(sysExBytes);
					}
					catch (DeviceException ex)
					{
						Console.WriteLine("Device lost, you're on your own now!");
						return;
					}
					catch (Exception ex)
					{
						Console.WriteLine($"Failed to read sysex midi out command!\nCommand: {cmd}");
					}
				}
			}
		}
	}
}