using SC.XR.Unity;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Rendering;

public class SafetyAreaCommandBuffer : SingletonMono<SafetyAreaCommandBuffer>
{
    public Mesh quadMesh;
    public Material quadMaterial;
    public Material blitMaterial;
    //public Color clearColor;
    private CommandBuffer commandBuffer;

    private float fadeValue;
    private bool isLoading = false;

    // Start is called before the first frame update
    IEnumerator Start()
    {
        yield return new WaitUntil(()=>API_GSXR_Slam.GSXR_Is_SlamInitialized() && API_GSXR_Slam.GSXR_Get_EyeCameras().Count != 0);

        commandBuffer = new CommandBuffer();
        commandBuffer.name = "LQRCommandBufferTest";
        
    }

    public void AddLoading()
    {
        if (API_GSXR_Slam.GSXR_Get_EyeCameras().Count == 0) return;

        RemoveLoading();
        fadeValue = 0f;
        isLoading = true;

        List<Camera> cameraList = API_GSXR_Slam.GSXR_Get_EyeCameras();
        for (int i = 0; i < cameraList.Count; i++)
        {
            Camera camera = cameraList[i];
            camera.AddCommandBuffer(CameraEvent.AfterEverything, commandBuffer);

        }
    }

    public void RemoveLoading()
    {
        if (!isLoading) return;
        isLoading = false;
        List<Camera> cameraList = API_GSXR_Slam.GSXR_Get_EyeCameras();
        for (int i = 0; i < cameraList.Count; i++)
        {
            Camera camera = cameraList[i];
            camera.RemoveCommandBuffer(CameraEvent.AfterEverything, commandBuffer);
        }
    }

    private void Update()
    {
        if (isLoading)
        {
            fadeValue += Time.deltaTime;
            if (fadeValue > 2f)
            {
                RemoveLoading();
            }
        }
    }

    private float rotateValue = 0f;

    // Update is called once per frame
    void LateUpdate()
    {
        if (!isLoading) return;
        if (commandBuffer == null) return;
        if (API_GSXR_Slam.GSXR_Get_Head() == null) return;
        commandBuffer.Clear();
        commandBuffer.ClearRenderTarget(true, true, Color.black);
        if (fadeValue > 0.5f)
        {
            Matrix4x4 matrix = new Matrix4x4();
            matrix.SetTRS(API_GSXR_Slam.GSXR_Get_Head().position + API_GSXR_Slam.GSXR_Get_Head().forward * 15f,
                Quaternion.Euler(API_GSXR_Slam.GSXR_Get_Head().rotation.eulerAngles.x, API_GSXR_Slam.GSXR_Get_Head().rotation.eulerAngles.y, rotateValue += 250 * Time.deltaTime),
                Vector3.one * 0.8f);
            commandBuffer.DrawMesh(quadMesh, matrix, quadMaterial);
        }
    }
}