package com.nq.controller;

import com.google.code.kaptcha.Producer;
import com.nq.utils.captcha.CaptchaUtil;
import java.awt.image.BufferedImage;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;


@Controller
@RequestMapping({"/code/"})
public class VerifyCodeController {
    private static final Logger log = LoggerFactory.getLogger(VerifyCodeController.class);

    @Autowired
    private Producer captchaProducer;

    @RequestMapping({"getCaptcha.do"})
    public ModelAndView getCaptcha() {
        ModelAndView mv = new ModelAndView();
        mv.addObject("timestamp", Long.valueOf(System.currentTimeMillis()));
        mv.setViewName("test/test_code");
        return mv;
    }

    @RequestMapping({"getCode.do"})
    public ModelAndView getCode(HttpServletRequest request, HttpServletResponse response,
                                @RequestParam(value = "timestamp", required = false) String timestamp,
                                @RequestParam(value = "token", required = false) String token) throws IOException {
        ModelAndView mv = new ModelAndView();
        if (StringUtils.isEmpty(timestamp)) {
            mv.addObject("timestamp", Long.valueOf(System.currentTimeMillis()));
        } else {
            mv.addObject("timestamp", timestamp);
        }
        response.setDateHeader("Expires", 0L);
        response.setHeader("Cache-Control", "no-store, no-cache, must-revalidate");
        response.addHeader("Cache-Control", "post-check=0, pre-check=0");
        response.setHeader("Pragma", "no-cache");
        response.setContentType("image/jpeg");
        String capText;
        if (StringUtils.isNotBlank(token)) {
            String trimmedToken = token.trim();
            String existing = CaptchaUtil.get(trimmedToken);
            if (StringUtils.isNotBlank(existing)) {
                capText = existing;
            } else {
                capText = this.captchaProducer.createText();
                CaptchaUtil.save(trimmedToken, capText);
                log.info("图形验证码已写入Redis token={}", trimmedToken);
            }
        } else {
            capText = this.captchaProducer.createText();
            HttpSession session = request.getSession();
            session.removeAttribute("KAPTCHA_SESSION_KEY");
            session.setAttribute("KAPTCHA_SESSION_KEY", capText);
        }
        BufferedImage bi = this.captchaProducer.createImage(capText);
        ServletOutputStream out = response.getOutputStream();
        ImageIO.write(bi, "jpg", out);
        try {
            out.flush();
        } finally {
            out.close();
        }
        return null;
    }

    //验证码
    @RequestMapping({"checkCode.do"})
    @ResponseBody
    public String checkCode(@RequestParam(value = "timestamp", required = false) String timestamp,
                            @RequestParam(value = "code", required = false) String code,
                            @RequestParam(value = "token", required = false) String token,
                            HttpServletRequest request) {
        boolean returnStr = false;
        if (StringUtils.isNotBlank(token)) {
            returnStr = CaptchaUtil.verifyAndRemove(token.trim(), code);
        } else {
            HttpSession session = request.getSession();
            String original = (String) session.getAttribute("KAPTCHA_SESSION_KEY");
            log.info("======用户输入的验证码：" + code);
            log.info("======正确的验证码：" + original);
            if (StringUtils.isNotEmpty(code) && code.equalsIgnoreCase(original)) {
                returnStr = true;
            }
        }
        return returnStr + "";
    }
}