using UdonSharp;
using UnityEngine;
using VRC.Udon.Common;


[ExecuteInEditMode]
[UdonBehaviourSyncMode(BehaviourSyncMode.Manual)]
public class CameraOverlay : UdonSharpBehaviour
{
	[SerializeField] private Animator _Animator;
	[SerializeField] private GameObject _OverlayElements;
	[Space]
	[SerializeField, Range(0.0f, 2.5f)] private float _AspectRatio = 1.7777777777777777777777777777777777777f;

	[UdonSynced] private bool _OverlayElementsEnabled = false;
	[UdonSynced] private bool _FadeOutAnimation = false;

	private Camera _Camera = null;

	private const float NEAR_PLANE_OFFSET = 0.05f;


	void Update()
	{
		if (transform.parent != null)
		{
			if (_Camera != null)
			{
				_UpdateCameraSettings();
				return;
			}

			Camera ParentCamera = GetComponentInParent<Camera>();
			if (ParentCamera)
			{
				_Camera = ParentCamera;
				transform.localRotation = Quaternion.identity;
				_UpdateCameraSettings();
			}
			else
			{
				_Camera = null;
			}
		}
	}

	public override void OnDeserialization(DeserializationResult Result)
	{
		_EnableOverlayElements_Synced();
		_PlayFadeOutAnimation_Synced();

		base.OnDeserialization(Result);
	}


	public void EnableOverlayElements(bool Enable)
	{
		_OverlayElementsEnabled = Enable;
		_EnableOverlayElements_Synced();

		_FadeOutAnimation = false;
		_PlayFadeOutAnimation_Synced();

		RequestSerialization();
	}
	private void _EnableOverlayElements_Synced()
	{
		_OverlayElements.SetActive(_OverlayElementsEnabled);
	}

	public void PlayFadeOutAnimation()
	{
		_FadeOutAnimation = true;
		_PlayFadeOutAnimation_Synced();
		RequestSerialization();
	}
	private void _PlayFadeOutAnimation_Synced()
	{
		if (_Animator)
		{
			_Animator.SetBool("Fade Out", _FadeOutAnimation);
		}
	}


	private void _UpdateCameraSettings()
	{
		Vector3 Position = Vector3.zero;
		Position.z = _Camera.nearClipPlane + NEAR_PLANE_OFFSET;
		transform.localPosition = Position;

		Vector3 Scale = Vector3.one;
		Scale.y = 2.0f * Position.z * Mathf.Tan(_Camera.fieldOfView * 0.5f * Mathf.Deg2Rad);
		Scale.x = Scale.y * _AspectRatio;
		transform.localScale = Scale;
	}
}