using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
#if UNITY_WEBGL
using WeChatWASM;
#endif
using ZXing;
using ZXing.QrCode;

/// <summary>
/// 扫描图片
/// </summary>
public class ScanQRCode : MonoBehaviour
{
    bool isOpen = true; //true当前开启扫描状态 false 当前是关闭扫描状态

    Animator ani; //扫描动画

    private WebCamTexture m_webCameraTexture;//摄像头实时显示的画面
    private BarcodeReader m_barcodeRender; //申请一个读取二维码的变量
    //存放二维码的纹理图片
    Texture2D encoded;

    [Header("显示摄像头画面的RawImage")]
    public RawImage m_cameraTexture;

    [Header("扫描间隔")]
    public float m_delayTime = 3f;

    [Header("开启扫描按钮")]
    public Button openScanBtn;

    [Header("扫描按钮")]
    public Button ScanBtn;

    void Start()
    {
        Debug.Log("ScanQRCode.Start()");
        /*初始化纹理图片
        * 注意：宽高度大小必须是256，
        * 否则出现索引超出数组边界错误
        */
        encoded = new Texture2D(256, 256);
        CreatQr("http://192.168.1.88/T");

        ScanBtn.onClick.AddListener(()=>{
            StartScanQRCode((rs) =>
            {
                CreatQr(rs);
            });
        });
        return;
        try
        {
            //摄像机权限
#if UNITY_WEBGL
            if (LoadDll.m_bInWX)
            {
                AppAuthorizeSetting au = WX.GetAppAuthorizeSetting();
                if (au.cameraAuthorized != "authorized")
                {//未授权
                    AuthorizeOption opt = new AuthorizeOption();
                    opt.complete = (rs) => { Debug.Log($"Cam Authorze complete {rs.errMsg}"); };
                    opt.success = (rs) => { Debug.Log($"Cam Authorze success {rs.errMsg}"); };
                    opt.fail = (rs) => { Debug.Log($"Cam Authorze fail {rs.errMsg}"); };
                    WX.Authorize(opt);
                    return;
                }
            }
            else
#endif
            {
                Application.RequestUserAuthorization(UserAuthorization.WebCam);
            }

            InitQRScan();
        }
        catch(System.Exception e)
        {
            Debug.Log($"{e.Message}");
        }
       
    }

    void InitQRScan()
    {
        WebCamDevice[] tDevices = WebCamTexture.devices;    //获取所有摄像头
        if (tDevices.Length > 0)
        {
            string tDeviceName = tDevices[0].name;  //获取第一个摄像头，用第一个摄像头的画面生成图片信息
            m_webCameraTexture = new WebCamTexture(tDeviceName, 400, 300);//名字,宽,高
            m_cameraTexture.texture = m_webCameraTexture;   //赋值图片信息
            m_webCameraTexture.Play();  //开始实时显示
            m_barcodeRender = new BarcodeReader();
        }
        else
        {
            Debug.Log("No Camera!");
            return;
        }
        ani = GetComponent<Animator>();

        OpenScanQRCode(); //默认不扫描
        //按钮监听
        openScanBtn.onClick.AddListener(OpenScanQRCode);
    }

#region 生成二维码

    /// <summary>  
    /// 创建二维码
    /// </summary>  
    public void CreatQr(string QrCodeStr)
    {
        if (QrCodeStr != string.Empty)
        {
            //二维码写入图片    
            var color32 = Encode(QrCodeStr, encoded.width, encoded.height);
            encoded.SetPixels32(color32); //更改纹理的像素颜色
            encoded.Apply();
            //生成的二维码图片附给RawImage    
            m_cameraTexture.texture = encoded;
        }
        else
            Debug.Log("没有生成信息");
    }

    /// <summary>
    /// 生成二维码 
    /// </summary>
    /// <param name="textForEncoding">需要生产二维码的字符串</param>
    /// <param name="width">宽</param>
    /// <param name="height">高</param>
    /// <returns></returns>       
    private static Color32[] Encode(string formatStr, int width, int height)
    {

        //绘制二维码前进行一些设置
        QrCodeEncodingOptions options = new QrCodeEncodingOptions();

        //设置字符串转换格式，确保字符串信息保持正确
        options.CharacterSet = "UTF-8";

        //设置绘制区域的宽度和高度的像素值
        options.Width = width;
        options.Height = height;

        //设置二维码边缘留白宽度（值越大留白宽度大，二维码就减小）
        options.Margin = 1;

        /*实例化字符串绘制二维码工具
         * BarcodeFormat:条形码格式
         * Options： 编码格式（支持的编码格式）
         */
        var barcodeWriter = new BarcodeWriter { Format = BarcodeFormat.QR_CODE, Options = options };
        //进行二维码绘制并进行返回图片的颜色数组信息
        return barcodeWriter.Write(formatStr);

    }
#endregion

#region 扫描二维码

    void StartScanQRCode(Action<string> callback)
    {
#if UNITY_WEBGL
        if (LoadDll.m_bInWX)
        {
            ScanCodeOption sco = new ScanCodeOption();
            sco.success = (rs) => { Debug.Log($"Cam Scan success {rs.result}\n {rs.path}\n {rs.rawData}"); callback(rs.rawData); };
            sco.fail = (rs) => { Debug.Log($"Cam Scan fail {rs.errMsg}"); callback(""); };

            WX.ScanCode(sco);
            Debug.Log("WX Scan ScanCode");
        }
        else
        {
            Debug.Log("WebGL Scan Not Ready");
        }
#endif
    }

    //开启关闭扫描二维码
    void OpenScanQRCode()
    {
        if (isOpen)
        {
            //开启状态，需要关闭扫描
            ani.Play("CloseScan", 0, 0);
            //CancelInvoke("CheckQRCode");
            Debug.Log("CloseScan ");
        }
        else
        {
            //关闭状态，需要开启扫描

            //开始扫描
            ani.Play("OpenScan", 0, 0);

            //以秒为单位调用方法 
            //InvokeRepeating("CheckQRCode", 0, m_delayTime);
            Debug.Log("OpenScan ");
        }
        isOpen = !isOpen;
    }

#endregion

#region 检索二维码方法
    /// <summary>
    /// 检索二维码方法
    /// </summary>
    public void CheckQRCode()
    {
        //存储摄像头画面信息贴图转换的颜色数组
        Color32[] m_colorData = m_webCameraTexture.GetPixels32();

        //将画面中的二维码信息检索出来
        var tResult = m_barcodeRender.Decode(m_colorData, m_webCameraTexture.width, m_webCameraTexture.height);

        if (tResult != null)
        {
            //Application.OpenURL(tResult.Text);
            Debug.Log(tResult.Text);
        }
        else
        {
            Debug.Log("CheckQRCode Error");
        }
    }
#endregion

}