package com.gkhy.exam.admin.system;

import cn.hutool.core.codec.Base64;
import cn.hutool.core.lang.UUID;
import com.gkhy.exam.common.api.CommonResult;
import com.gkhy.exam.common.constant.CacheConstant;
import com.gkhy.exam.common.utils.RedisUtils;
import com.gkhy.exam.system.service.SysConfigService;
import com.google.code.kaptcha.Producer;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.util.FastByteArrayOutputStream;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;


@Api(tags = "验证码前端控制器")
@RestController
@RequestMapping("/system/captcha")
public class CaptchaController
{
    @Resource(name = "captchaProducer")
    private Producer captchaProducer;

    @Resource(name = "captchaProducerMath")
    private Producer captchaProducerMath;

    @Autowired
    private SysConfigService configService;

    @Autowired
    private RedisUtils redisUtils;

    /**
     * 生成验证码
     */
    @ApiOperation(value = "生成验证码")
    @GetMapping("/captchaImage")
    public CommonResult captchaImage(){
        Map<String,Object> map=new HashMap<>();
        boolean captchaEnabled=configService.selectCaptchaEnabled();
        map.put("captchaEnabled", captchaEnabled);
        if(!captchaEnabled){
            return CommonResult.success(captchaEnabled);
        }
        // 保存验证码信息
        String uuid = UUID.randomUUID().toString();
        String verifyKey = CacheConstant.CAPTCHA_CODE_KEY + uuid;

        String capStr = null, code = null;
        BufferedImage image = null;

        // 生成验证码
        String captchaType = "math";
        if ("math".equals(captchaType))
        {
            String capText = captchaProducerMath.createText();
            capStr = capText.substring(0, capText.lastIndexOf("@"));
            code = capText.substring(capText.lastIndexOf("@") + 1);
            image = captchaProducerMath.createImage(capStr);
        }
        else if ("char".equals(captchaType))
        {
            capStr = code = captchaProducer.createText();
            image = captchaProducer.createImage(capStr);
        }

        redisUtils.set(verifyKey, code, 2, TimeUnit.MINUTES);
        // 转换流信息写出
        FastByteArrayOutputStream os = new FastByteArrayOutputStream();
        try
        {
            ImageIO.write(image, "jpg", os);
        }
        catch (IOException e)
        {
            return CommonResult.failed(e.getMessage());
        }

        map.put("uuid",uuid);
        map.put("image", Base64.encode(os.toByteArray()));
        return CommonResult.success(map);
    }
}