package com.ruoyi.system.service.impl;

import com.alibaba.fastjson2.JSONObject;
import com.ruoyi.common.utils.http.HttpUtils;
import com.ruoyi.common.config.TiandituMapConfig;
import com.ruoyi.system.service.IMapService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;

/**
 * 天地图服务实现
 * 
 * @author ruoyi
 */
@Service("tiandituMapService")
public class TiandituMapServiceImpl implements IMapService {
    
    private static final Logger logger = LoggerFactory.getLogger(TiandituMapServiceImpl.class);
    
    @Autowired
    private TiandituMapConfig tiandituMapConfig;
    
    /**
     * 地址转GPS坐标（地理编码）
     * 
     * @param address 地址
     * @param city 城市（可选，用于提高解析准确性）
     * @return GPS坐标，包含lng和lat，如果获取失败返回null
     */
    @Override
    public Map<String, Double> geocoding(String address, String city) {
        // 如果地址为空，直接返回null
        if (address == null || address.trim().isEmpty()) {
            return null;
        }
        
        try {
            // 构建天地图地理编码API URL
            String url = "http://api.tianditu.gov.cn/geocoder";
            String params = "ds=" + URLEncoder.encode("{\"keyWord\":\"" + address + "\"}", StandardCharsets.UTF_8.toString()) +
                           "&tk=" + tiandituMapConfig.getTk();
            
            logger.info("天地图地理编码请求: address={}, city={}", address, city);
            
            // 发送HTTP请求
            String response = HttpUtils.sendGet(url, params);
            
            // 解析响应
            JSONObject jsonObject = JSONObject.parseObject(response);
            
            // 检查状态
            if (jsonObject.getInteger("status") == null || jsonObject.getInteger("status") != 0) {
                logger.warn("天地图地理编码失败: address={}, status={}, msg={}", 
                           address, jsonObject.getInteger("status"), jsonObject.getString("msg"));
                return null;
            }
            
            // 提取坐标
            JSONObject result = jsonObject.getJSONObject("result");
            if (result == null) {
                logger.warn("天地图地理编码响应无result: address={}", address);
                return null;
            }
            
            JSONObject location = result.getJSONObject("location");
            if (location == null) {
                logger.warn("天地图地理编码响应无location: address={}", address);
                return null;
            }
            
            double lng = location.getDouble("lon");
            double lat = location.getDouble("lat");
            
            logger.info("天地图地理编码成功: address={}, lng={}, lat={}", address, lng, lat);
            
            Map<String, Double> coordinates = new HashMap<>();
            coordinates.put("lng", lng);
            coordinates.put("lat", lat);
            
            return coordinates;
        } catch (Exception e) {
            // 捕获所有异常，避免影响主流程
            logger.error("天地图地理编码异常: address=" + address, e);
            return null;
        }
    }
}