using System.Collections;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using System.Threading.Tasks;
using UnityEditor.Rendering;
using UnityEngine;
using UnityEngine.UIElements;

public class DepthTester : MonoBehaviour
{
    public int FrameRes = 256;
    public float Offset = 0.02f;

    private RenderTexture texture;
    public Texture2D texture2D;
    private Camera camera;
    private float farPlane;
    private float nearPlane;
    private int id;
    private Task<float[]> task;

    // Start is called before the first frame update
    void Start()
    {
        camera = GetComponent<Camera>();
        id = camera.GetInstanceID();
        farPlane = camera.farClipPlane;
        nearPlane = camera.nearClipPlane;
        texture = BlendShaderController.CreateTextures(1, FrameRes, FrameRes, false)[0];
        camera.targetTexture = texture;
        texture2D = new Texture2D(texture.width, texture.height, TextureFormat.RGBAFloat, false);
        task = DepthRenderPassFeature.DepthRenderPass.RequestDepthDataAsync(id);
    }

    private void OnDisable()
    {
        if (texture != null)
        {
            Destroy(texture);
        }

        if (texture2D != null)
        {
            Destroy(texture2D);
        }
    }

    private void Update()
    {
        lock(task)
        {
            if(task != null)
            {
                if(task.IsCompletedSuccessfully)
                {
                    float[] depths = task.Result;
                    int centerIndex = (FrameRes / 2) * FrameRes + (FrameRes / 2);  
                    float depth = depths[centerIndex];      
                    Vector3 depthPos = transform.position + transform.right * Offset;
                    Debug.DrawLine(depthPos, depthPos + transform.forward * depth, Color.green);
                    Debug.Log($"chto to risuet: dist:{depth}; depthsCount: {depths.Length}");
                    task = DepthRenderPassFeature.DepthRenderPass.RequestDepthDataAsync(id);
                }
                else if(task.IsCanceled)
                {
                    task = DepthRenderPassFeature.DepthRenderPass.RequestDepthDataAsync(id);
                }
            }
        }

        Vector3 raycastPos = transform.position - transform.right * Offset;
        float rayDistance = 0;
        if(Physics.Raycast(transform.position, transform.forward, out var hit, 100))
        {
            rayDistance = hit.distance;
            Debug.DrawLine(raycastPos, raycastPos + transform.forward * rayDistance, Color.red);
        }
    }
}