package com.example.mini_program.service;

import com.example.mini_program.config.WxMiniAppConfig;
import com.fasterxml.jackson.annotation.JsonProperty;
import lombok.Data;
import org.json.JSONObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;

@Service
public class WxLoginService {

    private static final Logger logger = LoggerFactory.getLogger(WxLoginService.class);
    private static final String JSCODE2SESSION_URL =
            "https://api.weixin.qq.com/sns/jscode2session?appid=%s&secret=%s&js_code=%s&grant_type=authorization_code";

    private final WxMiniAppConfig wxMiniAppConfig;
    private final RestTemplate restTemplate;

    public WxLoginService(WxMiniAppConfig wxMiniAppConfig, RestTemplate restTemplate) {
        this.wxMiniAppConfig = wxMiniAppConfig;
        this.restTemplate = restTemplate;
    }

    /**
     * 调用微信接口用code换取openid
     */
    public WxLoginResult code2Session(String code) {
        String url = String.format(JSCODE2SESSION_URL,
                wxMiniAppConfig.getAppid(),
                wxMiniAppConfig.getSecret(),
                code);

        logger.info("调用微信jscode2session接口, code: {}", code);

        try {
            String response = restTemplate.getForObject(url, String.class);
            logger.info("微信返回原始结果: {}", response);

            JSONObject json = new JSONObject(response);
            WxLoginResult result = new WxLoginResult();
            result.setOpenid(json.optString("openid"));
            result.setSessionKey(json.optString("session_key"));
            result.setUnionid(json.optString("unionid"));
            result.setErrcode(json.optString("errcode"));
            result.setErrmsg(json.optString("errmsg"));

            logger.info("解析后结果: openid={}, unionid={}, errcode={}",
                    result.getOpenid(), result.getUnionid(), result.getErrcode());
            return result;
        } catch (Exception e) {
            logger.error("调用微信接口失败", e);
            WxLoginResult errorResult = new WxLoginResult();
            errorResult.setErrcode("-1");
            errorResult.setErrmsg("系统错误: " + e.getMessage());
            return errorResult;
        }
    }

    @Data
    public static class WxLoginResult {

        @JsonProperty("session_key")
        private String sessionKey;

        private String unionid;
        private String openid;
        private String errcode;
        private String errmsg;
    }
}