package com.xkrs.controller;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.xkrs.common.config.ConstantConfig;
import com.xkrs.common.encapsulation.PromptMessageEnum;
import com.xkrs.dao.WeChatCodeDao;
import com.xkrs.model.entity.WeChatCode;
import com.xkrs.utils.HttpClientUtil;
import org.springframework.context.i18n.LocaleContextHolder;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import javax.annotation.Resource;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Locale;

import static com.xkrs.common.encapsulation.OutputEncapsulation.outputEncapsulationObject;

/**
 * @author XinYi Song
 * 微信扫码登录
 */
@RestController
public class WeChatController {

    @Resource
    private WeChatCodeDao weChatCodeDao;

    @GetMapping("/callback")
    public String callback(@RequestParam("code") String code, String state) throws Exception {
        Locale locale = LocaleContextHolder.getLocale();
        try{
            //1.获取code值,临时票据,类似于验证码
            System.out.println(code);
            //2.拿着code请求微信固定的地址,得到两个值access_token和openid
            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                    "?appid=%s" +
                    "&secret=%s" +
                    "&code=%s" +
                    "&grant_type=authorization_code";

            String accessTokenUrl = String.format(baseAccessTokenUrl,
                    ConstantConfig.WX_OPEN_APP_ID,
                    ConstantConfig.WX_OPEN_APP_SECRET,
                    code);
            //请求这个拼接好的地址得到返回的值,现在请求地址,不用浏览器了,用httpclient发送一个请求得到一个返回的地址
            String accessTokenInfo = HttpClientUtil.doGet(accessTokenUrl);
            //所以我们需要对字符串进行分割,先将字符串转换成map集合,map是key-value结构,再根据map中的key得到结果,这里我们用gson
            JSONObject jsonObject = JSON.parseObject(accessTokenInfo);
            String access_token =(String) jsonObject.get("access_token");
            String openid = (String)jsonObject.get("openid");

            //扫码人信息加到数据库中去
            //判断数据库中是否存在相同的数据库信息,我们可以根据openid来做判断
            WeChatCode byOpenId = weChatCodeDao.findByOpenId(openid);
            if (byOpenId ==null){
                //member为空,表示数据库中没有相同的信息
                //3.拿到access_token和openid,再去请求微信提供固定的地址,获取到扫码人的信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                String userInfoUrl = String.format(
                        baseUserInfoUrl,
                        access_token,
                        openid
                );
                //发送请求
                String userInfo = HttpClientUtil.doGet(userInfoUrl);
                //获取返回的userInfo字符串的扫描人信息
                JSONObject jsonObject1 = JSON.parseObject(userInfo);
                System.out.println("------>" + jsonObject1);
                //昵称
                String nickname =(String) jsonObject1.get("nickname");
                //头像
                String headimgurl =(String) jsonObject1.get("headimgurl");
                Integer sex = (Integer) jsonObject1.get("sex");
                String unionid = (String) jsonObject1.get("unionid");


                WeChatCode weChatCode = new WeChatCode();
                weChatCode.setOpenId(openid);
                weChatCode.setNickName(nickname);
                weChatCode.setUserPhoto(headimgurl);
                weChatCode.setUserSex(sex.toString());
                weChatCode.setUnid(unionid);

                weChatCodeDao.save(weChatCode);
            }
            //最后返回我们的首页面
            //由于我们在前端中需要显示用户名和头像,所以我们需要使用jwt在地址中传递token
            //不能使用cookie,是因为cookie不能跨域访问,会导致值传递失败
            //使用jwt根据member对象生成token字符串
            //String jwtToken = JwtUtils.getJwtToken(member.getId(), member.getNickname());

            return "redirect:http://localhost:3000?openId="+openid;
        }catch(Exception e){
            return outputEncapsulationObject(PromptMessageEnum.PROCESS_FAIL,"操作失败!",locale);
        }
    }

    /**
     * 1.生成微信扫描二维码
     * @return
     */
    @GetMapping("/weChatScanCodeLogin")
    public String getWxCode(){
        /*第一种方式:固定地址后面拼参数,参数太多,容易拼错
        String url = "https://open.weixin.qq.com/connect/qrconnect?appid="+ ConstantWxUtils.WX_OPEN_APP_ID
            +"&response_type=code";
         */
        //第二种方式:%s:相当于一个占位符
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";

        //对redirect_url进行URLEnccode编码
        String redirect_url =ConstantConfig.WX_OPEN_REDIRECT_URL;
        try {
            redirect_url = URLEncoder.encode(redirect_url, "utf-8");
        } catch (Exception e) {
            e.printStackTrace();
        }
        String url =String.format(
                baseUrl,
                ConstantConfig.WX_OPEN_APP_ID,
                redirect_url,
                "atguigu"
        );
        //请求微信地址
        return url;
    }
}