using UnityEngine;
using UnityEngine.Events;

namespace UltraCombos
{
	public class DisplayConfig : MonoBehaviour
	{
		[Header("Display")]
		[SerializeField] private FullScreenMode mode = FullScreenMode.Windowed;
		[SerializeField] private int displayCount = 1;
		[SerializeField] private Vector2Int resolution = new Vector2Int(1600, 900);
		[SerializeField] private int targetFps = 60;

		[Header("Misc")]
		[Range(0, 10)]
		[SerializeField] private float autoHideCursor = 0;
		private float cursorStamp;
		private Vector2 cursorLastPosition;
		[SerializeField] private bool exitOnEsc = true;

		private float timestamp = 0;
		[field: SerializeField, ReadOnly] public float CurrentFps { get; private set; } = 60.0f;

		[Header("Event")]
		public UnityEvent onQuit = new UnityEvent();

		private void Awake()
		{
			Application.targetFrameRate = targetFps;

#if UNITY_STANDALONE || UNITY_EDITOR
			if (mode == FullScreenMode.ExclusiveFullScreen)
			{
				var displays = Display.displays;
				var num = Mathf.Min(Mathf.Max(displayCount, 1), displays.Length);
				for (var i = 0; i < num; ++i)
				{
					displays[i].Activate();
				}
				Screen.SetResolution(Screen.width, Screen.height, mode);
			}
			else if (mode == FullScreenMode.FullScreenWindow)
			{
				Screen.SetResolution(Screen.width, Screen.height, mode);
			}
			else
			{
				Screen.SetResolution(resolution.x, resolution.y, mode);
			}
#else
            Screen.sleepTimeout = SleepTimeout.NeverSleep;
#endif
		}

		private void Update()
		{
			if (autoHideCursor > 0)
			{
#if ENABLE_INPUT_SYSTEM
				var pos = UnityEngine.InputSystem.Mouse.current.position.ReadValue();
#else
				var pos = (Vector2)Input.mousePosition;
#endif
				var bias = pos - cursorLastPosition;
				if (bias.magnitude > 1)
				{
					cursorLastPosition = pos;
					cursorStamp = Time.time;
				}

				Cursor.visible = Time.time - cursorStamp < autoHideCursor;
			}

			if (Time.time - timestamp > 0)
			{
				CurrentFps = Mathf.Lerp(CurrentFps, 1.0f / (Time.time - timestamp), Time.deltaTime);
				timestamp = Time.time;
			}

			if (exitOnEsc)
			{
#if ENABLE_INPUT_SYSTEM
				if (UnityEngine.InputSystem.Keyboard.current.escapeKey.wasPressedThisFrame)
#else
				if (Input.GetKeyDown(KeyCode.Escape))
#endif
				{
					onQuit.Invoke();
					Application.Quit();
				}
			}
		}
	}

}