package com.xcong.farmer.cms.modules.system.util;

import com.google.code.kaptcha.impl.DefaultKaptcha;
import com.xcong.farmer.cms.common.response.Result;
import com.xcong.farmer.cms.modules.system.service.ICommonService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import sun.misc.BASE64Encoder;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.*;
import java.awt.*;

@Component
public class CaptchaUtil {

    @Autowired
    private DefaultKaptcha producer;
    @Autowired
    private ICommonService iCommonService;
    //生成catchCreator的map
    public Result catchaImgCreator() throws IOException {
        //生成文字验证码
        String text = producer.createText();
        //生成文字对应的图片验证码
        BufferedImage image = creatImage(text);
        //将图片写出
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        ImageIO.write(image, "jpg", outputStream);
        //对写出的字节数组进行Base64编码 ==> 用于传递8比特字节码
        BASE64Encoder encoder = new BASE64Encoder();
        //生成token
        Map<String, Object> token = iCommonService.createToken(text);
        token.put("img", encoder.encode(outputStream.toByteArray()));
        return Result.ok(token);
    }

    private static final long serialVersionUID = 1L;

    //给定范围获得随机颜色
    public Color getRandColor(int fc, int bc) {
        Random random = new Random();
        if (fc > 255) {
            fc = 255;
        }
        if (bc > 255) {
            bc = 255;
        }
        int r = fc + random.nextInt(bc - fc);
        int g = fc + random.nextInt(bc - fc);
        int b = fc + random.nextInt(bc - fc);
        return new Color(r, g, b);
    }

    public BufferedImage creatImage(String code) {
        int width = 150, height = 42;
        //生成随机类
        Random random = new Random();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        //获取图形上下文
        Graphics g = image.getGraphics();
        // 设定背景色
        g.setColor(getRandColor(200, 250));
        g.fillRect(0, 0, width, height);
        //设定字体 第二个参数为字体为加粗
        g.setFont(new Font("Times New Roman", Font.BOLD, 45));
        // 随机产生155条干扰线，使图象中的认证码不易被其它程序探测到
        g.setColor(getRandColor(160, 200));
        for (int i = 0; i < 155; i++) {
            int x = random.nextInt(width);
            int y = random.nextInt(height);
            int xl = random.nextInt(12);
            int yl = random.nextInt(12);
            g.drawLine(x, y, x + xl, y + yl);
        }
        // 取随机产生的认证码(4位数字)
        for (int i = 0; i < code.length(); i++) {
            String rand = code.substring(i, i + 1);
            // 将认证码显示到图象中
            g.setColor(new Color(20 + random.nextInt(110), 20 + random.nextInt(110), 20 + random.nextInt(110)));
            //调用函数出来的颜色相同，可能是因为种子太接近，所以只能直接生成
            g.drawString(rand, 30 * i + 18, 35);
        }
        // 图象生效
        g.dispose();
        return image;
    }

}