using OpenCVCompact;
using Serenegiant.UVC;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
using UnityEngine.UI;

public class USBFaceDetectManager : FaceDetectManagerBase, IUVCDrawer
{
    public RawImage image;
    public RawImage cutImage;
    private Material _flipImg;
    private int[] _positionRect;
    private Texture2D _cutTexture;
    protected override void InitMatHelper()
    {
        _flipImg = new Material(Shader.Find("Unlit/FlipHorizontal")); ;
        InvokeRepeating("GCCollection", 0, 1f);
    }

    protected void GCCollection()
    {
        if (enabled == true && gameObject.activeInHierarchy == true)
            StartCoroutine(CleanUp());
    }
    protected IEnumerator CleanUp()
    {
        GC.Collect();
        yield return Resources.UnloadUnusedAssets();
        GC.Collect();
    }

    protected override Mat GetMat()
    {
        Mat img = null;
        if (UVCManager.Instance != null &&
            UVCManager.Instance.GetAttachedDevices() != null && UVCManager.Instance.GetAttachedDevices().Count > 0)
        {
            var devices = UVCManager.Instance.GetAttachedDevices();
            for (int i = 0; i < devices.Count; i++)
            {
                UVCManager.CameraInfo device = devices[i];
                //LogPrint.Log($"device: {device}, device name:{device.DeviceName} texture: {device.previewTexture}");
            }
            //image.texture = devices.FirstOrDefault().previewTexture;
            textureToFlipTexture2D(devices.FirstOrDefault().previewTexture, videoTexture);

            img = new Mat(UVCManager.Instance.DefaultHeight, UVCManager.Instance.DefaultWidth, CvType.CV_8UC4);
            Utils.texture2DToMat(videoTexture, img);
        }

        return img;
    }
    private void textureToFlipTexture2D(Texture texture, Texture2D texture2D)
    {
        if (texture == null)
            throw new ArgumentNullException("texture");

        if (texture2D == null)
            throw new ArgumentNullException("texture2D");

        if (texture.width != texture2D.width || texture.height != texture2D.height)
            throw new ArgumentException("texture and texture2D need to be the same size.");

        RenderTexture prevRT = RenderTexture.active;

        RenderTexture tempRT = RenderTexture.GetTemporary(texture.width, texture.height, 0, RenderTextureFormat.ARGB32);
        Graphics.Blit(texture, tempRT, _flipImg);

        RenderTexture.active = tempRT;
        texture2D.ReadPixels(new UnityEngine.Rect(0f, 0f, texture.width, texture.height), 0, 0, false);
        texture2D.Apply(false, false);
        RenderTexture.ReleaseTemporary(tempRT);

        RenderTexture.active = prevRT;
    }

    //protected override void AnalyzingFace()
    //{
    //    mat4Display = GetMat();
    //    if (mat4Display == null)
    //        return;
    //    //mat4Display.copyTo(mat4Process);
    //    var roiRect = new OpenCVCompact.Rect(
    //                _positionRect[0],
    //                _positionRect[1],
    //                Mathf.Abs(_positionRect[2] - _positionRect[0]),
    //                Mathf.Abs(_positionRect[3] - _positionRect[1]));

    //    mat4Process = new Mat(mat4Display, roiRect);


    //    //Face Detect
    //    panel.RefreshData(LandmarkDetect());



    //    Imgproc.rectangle(mat4Display, roiRect, new Scalar(255, 0, 0), 2);
    //    DebugPint();
    //}

    protected override void DebugPint()
    {
        //image.texture = videoTexture;
        if (mat4Process.rows() == _cutTexture.height)
        {
            LogPrint.Log("mat4Process.rows() " + mat4Process.rows() + " mat4Process.cols() " + mat4Process.cols());
            Mat cutMat = mat4Process.clone();

            LogPrint.Log($"mat4Display type:{mat4Display.type()}.{CvType.CV_8UC3},{CvType.CV_8UC4}");

            //Utils.matToTexture2D(cutMat, _cutTexture);
        }

        if (mat4Display.rows() == videoTexture.height)
        {
            //mat4Display.copyTo(mat4DisplayTexture);
            Mat display = mat4Display.clone();
            //Utils.matToTexture2D(display, videoTexture);
        }
    }

    protected override void DestroyManager()
    {
    }

    #region UVC
    public UVCFilter[] UVCFilters;
    private Texture SavedTexture;
    public bool OnUVCAttachEvent(UVCManager manager, UVCDevice device)
    {
        var result = !device.IsRicoh || device.IsTHETA;

        result &= UVCFilter.Match(device, UVCFilters);

        return result;
    }

    public void OnUVCDetachEvent(UVCManager manager, UVCDevice device)
    {
        LogPrint.Log("OnUVCDetachEvent " + device);
    }

    public bool CanDraw(UVCManager manager, UVCDevice device)
    {
        return UVCFilter.Match(device, UVCFilters);
    }

    public void OnUVCStartEvent(UVCManager manager, UVCDevice device, Texture tex)
    {
        HandleOnStartPreview(tex);
    }

    public void OnUVCStopEvent(UVCManager manager, UVCDevice device)
    {
        HandleOnStopPreview();
    }

    private void HandleOnStartPreview(Texture tex)
    {
        SavedTexture = videoTexture;

        videoTexture = new Texture2D(UVCManager.Instance.DefaultWidth, UVCManager.Instance.DefaultHeight, TextureFormat.RGBA32, false);
        _positionRect = PictureUtility.GetPositionRect(UVCManager.Instance.DefaultWidth, UVCManager.Instance.DefaultHeight);
        _cutTexture = new Texture2D(_positionRect[2], _positionRect[3], TextureFormat.RGBA32, false);
        image.texture = videoTexture;
        cutImage.texture = _cutTexture;

        //mat4Display = new Mat(UVCManager.Instance.DefaultWidth, UVCManager.Instance.DefaultHeight, CvType.CV_8UC4);
        mat4DisplayTexture = new Mat(UVCManager.Instance.DefaultWidth, UVCManager.Instance.DefaultHeight, CvType.CV_8UC4);

        LogPrint.Log("Screen.width " + Screen.width + " Screen.height " + Screen.height + " Screen.orientation " + Screen.orientation);

        dnnUtils.InitHeadPoseEstimationCameraInfo(UVCManager.Instance.DefaultWidth, UVCManager.Instance.DefaultHeight);
    }
    private void HandleOnStopPreview()
    {
        RestoreTexture();
    }

    private void RestoreTexture()
    {
        try
        {
            transform.GetComponent<Renderer>().material.mainTexture = SavedTexture;
        }
        catch (Exception e)
        {
            Debug.LogException(e);
        }
        SavedTexture = null;
    }
    #endregion
}