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

using System;
using System.Collections;
using UnityEngine;


namespace Yoga
{
    public class MotionUSBCameraCaptureManager : CaptureManagerBase, IUVCDrawer
    {
        private Material _flipImg;
        private void Awake()
        {
            _flipImg = Resources.Load<Material>("Materials/Unlit_FlipHorizontal");
            InvokeRepeating("GCCollection", 0, 1f);
        }

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

        protected override void ManagerDisable()
        {
            GlobalData.Instance.IsFlip = false;
        }
        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];
                }
                var index = PlayerPrefs.GetInt("USBCameraIndex");
                if (index >= devices.Count || index < 0) //数量超出时候改为默认第一个
                    index = 0;
                if (devices[index].previewTexture == null)
                    throw new Exception("No preview Texture found!");

                var tmpTex = new Texture2D(UVCManager.Instance.DefaultWidth, UVCManager.Instance.DefaultHeight);
                textureToFlipTexture2D(devices[index].previewTexture, tmpTex);
                img = new Mat(UVCManager.Instance.DefaultHeight, UVCManager.Instance.DefaultWidth, CvType.CV_8UC3);
                Utils.texture2DToMat(tmpTex, 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 MatInitial()
        {
            if (UVCManager.Instance == null)
                throw new Exception("没有连接USB摄像头");
        }

        #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

    }
}