package com.atguigu.yygh.user.api;

import com.alibaba.fastjson.JSONObject;
import com.atguigu.yygh.model.user.UserInfo;
import com.atguigu.yygh.user.service.UserInfoService;
import com.atguigu.yygh.user.utils.ConstantWxPropertiesUtils;
import com.atguigu.yygh.user.utils.HttpClientUtils;
import com.atguigu.yygu.common.helper.JwtHelper;
import com.atguigu.yygu.common.result.Result;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;

@Controller
@RequestMapping("/api/ucenter/wx")
public class WeixinApiController {
    @Autowired
    private UserInfoService userInfoService;

    //1、生成微信扫描的二维码
    //返回生成二维码需要参数
    @GetMapping("getLoginParam")
    @ResponseBody
    public Result genQrConnect() throws UnsupportedEncodingException {
        Map<String, Object> map = new HashMap<>();
        map.put("appid", ConstantWxPropertiesUtils.WX_OPEN_APP_ID);
        map.put("scope","snsapi_login");
        String wxOpenRedirectUrl = ConstantWxPropertiesUtils.WX_OPEN_REDIRECT_URL;
        wxOpenRedirectUrl = URLEncoder.encode(wxOpenRedirectUrl, "utf-8");
        map.put("redirect_uri",wxOpenRedirectUrl);
        map.put("state",System.currentTimeMillis()+"");
        return Result.ok(map);
    }

    //2、回调的方法，得到扫描人信息
    //微信扫码后回调的方法
    @GetMapping("callback")
    public String callback(String code,String state){
        //第一步 获取临时票据
        System.out.println("code:"+code);
        //第二步 拿着code和微信id和密钥，请求微信固定地址，得到两个值
        //使用code和appid以及appscrect换取access_token
        StringBuffer baseAccessTokenUrl = new StringBuffer()
                .append("https://api.weixin.qq.com/sns/oauth2/access_token")
                .append("?appid=%s")
                .append("&secret=%s")
                .append("&code=%s")
                .append("&grant_type=authorization_code");

        String accessTokenUrl = String.format(baseAccessTokenUrl.toString(),
                ConstantWxPropertiesUtils.WX_OPEN_APP_ID,
                ConstantWxPropertiesUtils.WX_OPEN_APP_SECRET,
                code);
        //使用httpclient请求这个地址
        try {
            String accesstokenInfo = HttpClientUtils.get(accessTokenUrl);
            System.out.println("accesstokenInfo:"+accesstokenInfo);
            //从返回的字符串获取两个值:openid和access_token
            JSONObject jsonObject = JSONObject.parseObject(accesstokenInfo);
            String access_token = jsonObject.getString("access_token");
            String openid = jsonObject.getString("openid");

            //判断数据库中是否已经存在微信扫码人的信息，根据openid做判断
            UserInfo userInfo=userInfoService.selectWxInfoOpenId(openid);
            if(userInfo==null){ //数据库中不存在微信信息
                //第三步 拿着openid和access_token请求微信地址，得到扫描人信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                String userInfoUrl = String.format(baseUserInfoUrl, access_token, openid);
                String resultInfo = HttpClientUtils.get(userInfoUrl);
                System.out.println("resultInfo:"+resultInfo);
                JSONObject resultUserInfoJson = JSONObject.parseObject(resultInfo);
                //解析用户信息
                //用户昵称
                String nickname = resultUserInfoJson.getString("nickname");
                //用户头像
                String headimgurl = resultUserInfoJson.getString("headimgurl");

                //将获取的扫描人信息添加到数据库
                userInfo=new UserInfo();
                userInfo.setNickName(nickname);
                userInfo.setOpenid(openid);
                userInfo.setStatus(1);
                userInfoService.save(userInfo);
            }

            //返回name和token字符串
            Map<String, Object> map = new HashMap<>();
            String name = userInfo.getName();
            if(StringUtils.isEmpty(name)) {
                name = userInfo.getNickName();
            }
            if(StringUtils.isEmpty(name)) {
                name = userInfo.getPhone();
            }
            map.put("name", name);
            //判断userInfo是否有手机号，如果手机号为空，返回openid
            //如果说手机号不为空，返回openid值是空字符串
            //前端判断：如果openid不为空，绑定手机号，如果openid为空，不需要绑定手机号
            if(StringUtils.isEmpty(userInfo.getPhone())) {
                map.put("openid", userInfo.getOpenid());
            } else {
                map.put("openid", "");
            }
            //使用JWT生成token字符串
            String token = JwtHelper.createToken(userInfo.getId(), name);
            map.put("token", token);
            //跳转到前端页面
            return "redirect:" + ConstantWxPropertiesUtils.YYGH_BASE_URL +
                    "/weixin/callback?token="+map.get("token")+
                    "&openid="+map.get("openid")+
                    "&name="+URLEncoder.encode((String) map.get("name"),"utf-8");
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

}
