using OpenCVForUnity.UnityUtils;
using Serenegiant.UVC;
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class UVCTexture : MonoBehaviour, IUVCDrawer
{
    /// <summary>
    /// 图片尺寸裁剪
    /// </summary>
    public float textureClipArea
    {
        get
        {
            if(_textureClipArea<=0)
            {
                _textureClipArea = PlayerPrefs.GetFloat("clipArea", 0.5f);
            }
            return _textureClipArea;
        }
    }
    float _textureClipArea = -1;
    /// <summary>
    /// 图片裁剪位置X
    /// </summary>
    public float clipOffsetX
    {
        get
        {
            if(_clipOffsetX < -1)
            {
                _clipOffsetX = PlayerPrefs.GetFloat("clipOffsetX", 0);
            }
            return _clipOffsetX;
        }
    }

    float _clipOffsetX = -2;
    /// <summary>
    /// 图片裁剪位置
    /// </summary>
    public float clipOffsetY
    {
        get
        {
            if (_clipOffsetY < -1)
            {
                _clipOffsetY = PlayerPrefs.GetFloat("clipOffsetY", 0);
            }
            return _clipOffsetY;
        }
    }

    float _clipOffsetY = -2;

    public int height
    {
        get
        {
            return texture.height;
        }
    }
    public int width
    {
        get
        {
            return texture.width;
        }
    }

    public float requestedFPS
    {
        get
        {
            return _requestedFPS;
        }
        set
        {
            _requestedFPS = value;
        }
    }
    float _requestedFPS;


    public bool didUpdateThisFrame
    {
        get
        {
            return _didUpdateThisFrame;
        }
    }
    bool _didUpdateThisFrame = false;
    /// <summary>
    /// 图片缩放，最好不要缩放，影响识别效果
    /// </summary>
    [Range(0.3f,1)]
    public float sizeScale = 0.5f;

    public bool isPlaying 
    {
        get 
        {
            return _isPlaying;
        }
    }
    bool _isPlaying;
    /// <summary>
    /// 是否为前置相机
    /// </summary>
    public bool isFrontFacing = false;
    public UVCFilter[] UVCFilters; 
    private const string TAG = "UVCDrawer#";
    UVCManager uvcManager;
    public Texture2D texture
    {
        get
        {
            return camTexture;
        }
    }

    Texture2D camTexture;
    public bool CanDraw(UVCManager manager, UVCDevice device)
    {
        return UVCFilter.Match(device, UVCFilters);
    }

    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)
    {
        Debug.Log("uvc detach event");
    }

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

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

    private void HandleOnStartPreview(Texture tex)
    {
        int width = (int)(tex.width * sizeScale * textureClipArea);
        int height = (int)(tex.height * sizeScale * textureClipArea);
        camTexture = new Texture2D(width, height, TextureFormat.RGB24, false);// (Texture2D)tex;
        Debug.Log("uvc texture start");
        _isPlaying = true;

        _didUpdateThisFrame = true;
    }

    void Update()
    {
        if (uvcManager != null)
        {
            var devices = uvcManager.GetAttachedDevices();
            if(devices.Count > 0)
            {
                textureToTexture2D(devices[0].previewTexture, camTexture);
            }
        }

        //if (uvcManager != null)
        //{
        //    camTexture = (Texture2D)uvcManager.GetAttachedDevices()[0].previewTexture;
        //    FindObjectOfType<RawImage>().texture = camTexture;
        //}

        //if (camTexture != null)
        //{
        //    frameTimer += Time.deltaTime;
        //    float fTime = 1 / FPS;
        //    if (frameTimer >= fTime)
        //    {
        //        _didUpdateThisFrame = true;
        //        frameTimer -= fTime;
        //    }
        //    else
        //    {
        //        _didUpdateThisFrame = false;
        //    }
        //}
    }

    private void HandleOnStopPreview()
    {
        Debug.Log("uvc stop preview");
    }

    public void Play()
    {

    }
    public void Pause()
    {

    }
    public void Stop()
    {
        Debug.Log("uvc texture stop");
    }

    public void textureToTexture2D(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;

        if (texture is RenderTexture)
        {
            RenderTexture.active = (RenderTexture)texture;
            texture2D.ReadPixels(new UnityEngine.Rect(0f, 0f, texture.width, texture.height), 0, 0, false);
            texture2D.Apply(false, false);
        }
        else
        {
            int width = (int)(texture.width * sizeScale);
            int height = (int)(texture.height * sizeScale);
            RenderTexture tempRT = RenderTexture.GetTemporary(width, height, 0, RenderTextureFormat.ARGB32);
            Graphics.Blit(texture, tempRT);
            RenderTexture.active = tempRT;

            Rect rect = new Rect(0, 0, width * textureClipArea, height * textureClipArea);
            rect.x = (width - rect.width) * 0.5f * (1 + clipOffsetX);
            rect.y = (height - rect.height) * 0.5f * (1 + clipOffsetY);

            texture2D.ReadPixels(rect, 0, 0, false);
            texture2D.Apply(false, false);
            RenderTexture.ReleaseTemporary(tempRT);
        }

        RenderTexture.active = prevRT;
    }
}