using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Rendering;

namespace Qjjxk.Blur
{
    [ExecuteAlways]
    public class MonitorDimension : MonoBehaviour
    {
        public RenderTexture captureRT;
        public CameraEvent cameraEvent;
        private List<BlurRawImage> _blurList;
        private CommandBuffer _cmdBuffer;
        private Camera _mainCamera;

        private void Awake()
        {
            _mainCamera = Camera.main!;
            captureRT = new RenderTexture(_mainCamera.pixelWidth, _mainCamera.pixelHeight, 0) { name = "CaptureRT" };
            _cmdBuffer = new CommandBuffer { name = "Capture" };
            _cmdBuffer.Blit(BuiltinRenderTextureType.CurrentActive, captureRT);
            cameraEvent = Application.isEditor ? CameraEvent.BeforeImageEffects : CameraEvent.AfterEverything;
            _mainCamera!.AddCommandBuffer(cameraEvent, _cmdBuffer);
        }

        public void Register(BlurRawImage blurRawImage, bool isReg = true)
        {
            _blurList ??= new List<BlurRawImage>();
            if (isReg)
            {
                _blurList.TryAdd(blurRawImage);
            }
            else
            {
                _blurList.Remove(blurRawImage);
                if (_blurList.Count != 0) return;
                this.Destroy();
            }
        }

        private void OnRectTransformDimensionsChange()
        {
            if (!gameObject.scene.isLoaded || _blurList == null || _blurList.Count == 0) return;
            captureRT.Resize(_mainCamera.pixelWidth, _mainCamera.pixelHeight);
            foreach (var blurRawImage in _blurList)
            {
                blurRawImage.SetWindowSize();
            }
        }
    }
}