using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using ZXing;
using ZXing.Common;
using ZXing.QrCode;

public class CreatQR : MonoBehaviour
{

    //需要生产二维码的字符串数组  
    string[] QrCodeStr = { "https://www.baidu.com/", "https://www.cnblogs.com/Mr-Miracle/", "https://unity3d.com/cn", "https://www.sogou.com/" };
    //在屏幕上显示二维码  
    public RawImage image;
    //存放二维码  
    Texture2D encoded;
    int Nmuber = 0;
    // Use this for initialization  
    void Start()
    {
        encoded = new Texture2D(256, 256);
        // GenerateQRImage3("https://www.baidu.com/", 512, 512, centericon);


        //onlyQRCode("https://www.weimaqi.net/index_.aspx?device_name=WXR02153",512,512);
    }
    // [SerializeField]
    // Texture2D centericon;
    // Update is called once per frame  
    // void Update()
    // {
    //     if (Input.GetKeyDown(KeyCode.Space))
    //     {
    //         GenerateQRImage3("https://www.baidu.com/", 512, 512, centericon);

    //         //image.texture = GenerateQRImageWithIcon("ytwjj", 512, 512, centericon);

    //        // Btn_CreatQr();
    //         //Nmuber++;
    //         //if (Nmuber >= QrCodeStr.Length)
    //         //{
    //         //    Nmuber = 0;
    //         //}
    //     }
    // }

    /// <summary>
    /// 定义方法生成二维码 
    /// </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 textForEncoding, int width, int height)
    {
        var writer = new BarcodeWriter
        {
            Format = BarcodeFormat.QR_CODE,
            Options = new QrCodeEncodingOptions
            {
                Height = height,
                Width = width,
                Margin = 1
            }
        };
        return writer.Write(textForEncoding);
    }


    /// <summary>  
    /// 生成二维码  
    /// </summary>  
    public void Btn_CreatQr()
    {

        if (QrCodeStr[Nmuber].Length > 1)
        {
            //二维码写入图片    
            var color32 = Encode(QrCodeStr[Nmuber], encoded.width, encoded.height);
            encoded.SetPixels32(color32);
            encoded.Apply();
            //生成的二维码图片附给RawImage    
            image.texture = encoded;
        }
        else
        {
            GameObject.Find("Text_1").GetComponent<Text>().text = "没有生成信息";
        }
    }


    /// <summary>
    /// 生成中心带有小图标二维码
    /// </summary>
    /// <param name="content"></param>
    /// <param name="width"></param>
    /// <param name="height"></param>
    /// <param name="centerIcon"></param>
    /// <returns></returns>
    public static Texture2D GenerateQRImageWithIcon(string content, int width, int height, Texture2D centerIcon)
    {
        // 编码成color32
        MultiFormatWriter writer = new MultiFormatWriter();
        Dictionary<EncodeHintType, object> hints = new Dictionary<EncodeHintType, object>();
        hints.Add(EncodeHintType.CHARACTER_SET, "UTF-8");
        hints.Add(EncodeHintType.MARGIN, 1);
        hints.Add(EncodeHintType.ERROR_CORRECTION, ZXing.QrCode.Internal.ErrorCorrectionLevel.H);
        BitMatrix bitMatrix = writer.encode(content, BarcodeFormat.QR_CODE, width, height, hints);
        // 转成texture2d
        int w = bitMatrix.Width;
        int h = bitMatrix.Height;
        Texture2D texture = new Texture2D(w, h);
        for (int x = 0; x < h; x++)
        {
            for (int y = 0; y < w; y++)
            {
                if (bitMatrix[x, y])
                {
                    texture.SetPixel(y, x, Color.black);
                }
                else
                {
                    texture.SetPixel(y, x, Color.white);
                }
            }
        }
        // 添加小图
        int halfWidth = texture.width / 2;
        int halfHeight = texture.height / 2;
        int halfWidthOfIcon = centerIcon.width / 4;
        int halfHeightOfIcon = centerIcon.height / 4;
        int centerOffsetX = 0;
        int centerOffsetY = 0;
        for (int x = 0; x < h; x++)
        {
            for (int y = 0; y < w; y++)
            {
                centerOffsetX = x - halfWidth;
                centerOffsetY = y - halfHeight;
                if (Mathf.Abs(centerOffsetX) <= halfWidthOfIcon && Mathf.Abs(centerOffsetY) <= halfHeightOfIcon)
                {
                    texture.SetPixel(x, y, centerIcon.GetPixel(centerOffsetX + halfWidthOfIcon, centerOffsetY + halfHeightOfIcon));
                }
            }
        }
        texture.Apply();
        return texture;
    }

    /// <summary>
    /// 生成2维码 方法三
    /// 在方法二的基础上，添加小图标
    /// </summary>
    /// <param name="content"></param>
    /// <param name="width"></param>
    /// <param name="height"></param>
    public void GenerateQRImage3(string content, int width, int height, Texture2D centerIcon)
    {
        // 编码成color32
        MultiFormatWriter writer = new MultiFormatWriter();
        Dictionary<EncodeHintType, object> hints = new Dictionary<EncodeHintType, object>();
        hints.Add(EncodeHintType.CHARACTER_SET, "UTF-8");
        hints.Add(EncodeHintType.MARGIN, 1);
        hints.Add(EncodeHintType.ERROR_CORRECTION, ZXing.QrCode.Internal.ErrorCorrectionLevel.H);
        BitMatrix bitMatrix = writer.encode(content, BarcodeFormat.QR_CODE, width, height, hints);

        // 转成texture2d
        int w = bitMatrix.Width;
        int h = bitMatrix.Height;
        Texture2D texture = new Texture2D(w, h);
        for (int x = 0; x < h; x++)
        {
            for (int y = 0; y < w; y++)
            {
                if (bitMatrix[x, y])
                {
                    texture.SetPixel(y, x, Color.blue);
                }
                else
                {
                    texture.SetPixel(y, x, Color.white);
                }
            }
        }
        // 添加小图
        int halfWidth = texture.width / 2;
        int halfHeight = texture.height / 2;
        int halfWidthOfIcon = centerIcon.width / 2;
        int halfHeightOfIcon = centerIcon.height / 2;
        int centerOffsetX = 0;
        int centerOffsetY = 0;
        for (int x = 0; x < h; x++)
        {
            for (int y = 0; y < w; y++)
            {
                centerOffsetX = x - halfWidth;
                centerOffsetY = y - halfHeight;
                if (Mathf.Abs(centerOffsetX) <= halfWidthOfIcon && Mathf.Abs(centerOffsetY) <= halfHeightOfIcon)
                {
                    texture.SetPixel(x, y, centerIcon.GetPixel(centerOffsetX + halfWidthOfIcon, centerOffsetY + halfHeightOfIcon));
                }
            }
        }
        texture.Apply();
        image.texture = texture;
        // 存储成文件
        //byte[] bytes = texture.EncodeToPNG();
        //string path = System.IO.Path.Combine(Application.dataPath, "qr.png");
        //System.IO.File.WriteAllBytes(path, bytes);
    }


    public void onlyQRCode(string content, int width, int height) {
        // 编码成color32
        MultiFormatWriter writer = new MultiFormatWriter();
        Dictionary<EncodeHintType, object> hints = new Dictionary<EncodeHintType, object>();
        hints.Add(EncodeHintType.CHARACTER_SET, "UTF-8");
        hints.Add(EncodeHintType.MARGIN, 1);
        hints.Add(EncodeHintType.ERROR_CORRECTION, ZXing.QrCode.Internal.ErrorCorrectionLevel.H);
        BitMatrix bitMatrix = writer.encode(content, BarcodeFormat.QR_CODE, width, height, hints);

        // 转成texture2d
        int w = bitMatrix.Width;
        int h = bitMatrix.Height;
        Texture2D texture = new Texture2D(w, h);
        for (int x = 0; x < h; x++)
        {
            for (int y = 0; y < w; y++)
            {
                if (bitMatrix[x, y])
                {
                    texture.SetPixel(y, x, Color.blue);
                }
                else
                {
                    texture.SetPixel(y, x, Color.white);
                }
            }
        }
        texture.Apply();
        image.texture = texture;
    }
}