using System.Collections.Generic;
using Extensions;

namespace Domain {
	public class KeyHistory {
		private readonly LimitedSizeList<int> _lastPresses = new(10);

		private readonly bool[] _isPressed = new bool[26];
		private readonly bool[] _wasPressed = new bool[26];

		public void KeyPressed(int key) => _lastPresses.Add(key);

		public void CheckPresses() {
			const int aIndex = 0x41;
			const int zIndex = 0x5A;

			for (int i = aIndex, j = 0; i <= zIndex; i++, j++) {
				_wasPressed[j] = _isPressed[j];
				short state = Win32API.GetAsyncKeyState(i);

				if (!_wasPressed[j] && state != 0) {
					_isPressed[j] = true;
					KeyPressed(i);
				}else if (_isPressed[j] && state == 0) {
					_isPressed[j] = false;
				}
			}
		}

		public bool ContainsSequence(List<int> sequence) {
			if (_lastPresses.List.Count < sequence.Count)
				return false;

			for (int i = 0; i < _lastPresses.List.Count; i++) {
				if (i >= sequence.Count)
					break;

				int keyPressed = _lastPresses.List[_lastPresses.List.Count - 1 - i];
				int sequenceKey = sequence[sequence.Count - 1 - i];

				if (keyPressed != sequenceKey) {
					return false;
				}
			}

			return true;
		}
	}
}