package com.ebts.web.controller.common;

import com.ebts.common.constant.Constants;
import com.ebts.common.core.entity.Result;
import com.ebts.common.core.redis.RedisCache;
import com.ebts.common.utils.sign.Base64;
import com.ebts.common.utils.uuid.IdUtils;
import com.google.code.kaptcha.Producer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.util.FastByteArrayOutputStream;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;

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

/**
 * 验证码操作处理
 *
 * @author binlin
 */
@RestController
@Slf4j
public class CaptchaController {

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

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

    @Autowired
    private RedisCache redisCache;

    // 验证码类型
    @Value("${ebts.captchaType}")
    private String captchaType;

    /**
     * 生成验证码
     */
    @GetMapping("/captchaImage")
    public Result<Map<String,Object>> getCode(HttpServletResponse response) throws IOException {
            // 保存验证码信息
            String uuid = IdUtils.simpleUUID();
            String verifyKey = Constants.CAPTCHA_CODE_KEY + uuid;

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

            // 生成验证码
            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);
            }

            redisCache.setCacheObject(verifyKey, code, Constants.CAPTCHA_EXPIRATION, TimeUnit.MINUTES);
            // 转换流信息写出
            FastByteArrayOutputStream os = new FastByteArrayOutputStream();
            try {
                assert image != null;
                ImageIO.write(image, "jpg", os);
            } catch (IOException e) {
                return Result.error(e.getMessage());
            }

            Map<String,Object> result = new HashMap<>();
            result.put("uuid", uuid);
            result.put("img", Base64.encode(os.toByteArray()));
            return Result.ok(result);
    }
}
