using OpenCVForUnity.CoreModule;
using OpenCVForUnity.UnityUtils;
using Serenegiant.UVC;

using System;
using UnityEngine;


namespace Yoga
{
    public class MotionUSBCameraCaptureManager : CaptureManagerBase, IUVCDrawer
    {
        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($"id:{i},pid:{device.Pid},vid:{device.Vid},deviceName:{device.DeviceName}");
                }
                Texture picCaptured = null;
                var index = PlayerPrefs.GetInt("USBCameraIndex");
                if (index >= devices.Count) //数量超出时候改为默认第一个
                    index = 0;
                for (int i = 0; i < devices.Count; i++)
                {
                    UVCManager.CameraInfo device = devices[i];
                    picCaptured = device.previewTexture;

                    if (i == index) //后续可改为IR和RGB条件
                        break;
                }
                if (picCaptured == null)
                    throw new Exception("No preview Texture found!");

                Texture2D tmpTex = new Texture2D(UVCManager.Instance.DefaultWidth, UVCManager.Instance.DefaultHeight);
                Utils.textureToTexture2D(picCaptured, tmpTex);
                tmpTex = PictureUtility.HorizontalFlipTexture(tmpTex);//picCaptured texture水平反转
                img = new Mat(UVCManager.Instance.DefaultHeight, UVCManager.Instance.DefaultWidth, CvType.CV_8UC3);
                Utils.texture2DToMat(tmpTex, img);
            }

            return img;
        }

        protected override void MatInitial()
        {
            if (UVCManager.Instance == null)
                throw new Exception("没有连接USB摄像头");

            Debug.LogWarning("USB Camera!");
        }

        #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 = TargetDisplayer.texture;
            _displayTexture = new Texture2D(UVCManager.Instance.DefaultWidth, UVCManager.Instance.DefaultHeight, TextureFormat.RGB24, false);
            TargetDisplayer.texture = _displayTexture;
        }
        private void HandleOnStopPreview()
        {
            RestoreTexture();
        }

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

    }
}