using System.Collections.Generic;
using System.Linq;

namespace Domain.Input {
	public class GeminadaReader : InputReader {
		protected override int Key { get; } = 0x33;
		private int LKey { get; } = 76;

		private bool _lPressed;
		private bool _lWasPressed;
		private bool _dotPressed;
		private bool _dotWasPressed;

		private List<int> _lastPresses;

		public override void UpdateInput() {
			if (UpdateLInput()) {
				if (_lastPresses.Count == 0) {
					_lastPresses.Add(LKey);
				} else if (_lastPresses.Count >= 2) {
					if (_lastPresses[^1] == Key && _lastPresses[^2] == LKey) {
						IsPressed = true;
					}
				}
			}
			UpdateDotInput();
		}

		private bool UpdateDotInput() {
			_dotWasPressed = _dotPressed;
			short dotState = Win32API.GetAsyncKeyState(Key);

			if (!_dotWasPressed && dotState != 0) {
				_dotPressed = true;
				return true;
			}
			if (_dotPressed && dotState == 0) {
				_dotPressed = false;
			}
			return false;
		}

		private bool UpdateLInput() {
			_lWasPressed = _lPressed;
			short lState = Win32API.GetAsyncKeyState(LKey);

			if (!_lWasPressed && lState != 0) {
				_lPressed = true;
				return true;
			}
			if (_lPressed && lState == 0) {
				_lPressed = false;
			}
			return false;
		}
	}
}