package utils

import (
	"encoding/json"
	"io/ioutil"
	"net/http"
	"strings"
)

type ReverseGeocodingReq struct {
	Ak           string `json:"ak"`
	Coordtype    string `json:"coordtype"`
	RetCoordtype string `json:"retCoordtype"`
	Location     string `json:"location"`
	Output       string `json:"output"`
	Language     string `json:"language"`
}

type ReverseGeocodingRes struct {
	Status int `json:"status"`
	Result struct {
		Location struct {
			Lng float64 `json:"lng"`
			Lat float64 `json:"lat"`
		} `json:"location"`
		FormattedAddress string `json:"formatted_address"`
		Edz              struct {
			Name string `json:"name"`
		} `json:"edz"`
		Business         string `json:"business"`
		AddressComponent struct {
			Country         string `json:"country"`
			CountryCodeIso  string `json:"country_code_iso"`
			CountryCodeIso2 string `json:"country_code_iso2"`
			CountryCode     int    `json:"country_code"`
			Province        string `json:"province"`
			City            string `json:"city"`
			CityLevel       int    `json:"city_level"`
			District        string `json:"district"`
			Town            string `json:"town"`
			TownCode        string `json:"town_code"`
			Distance        string `json:"distance"`
			Direction       string `json:"direction"`
			Adcode          string `json:"adcode"`
			Street          string `json:"street"`
			StreetNumber    string `json:"street_number"`
		} `json:"addressComponent"`
	} `json:"result"`
}

// ReverseGeo 经纬度逆编码
func ReverseGeo(longitude, latitude string, language string) (address string, err error) {
	var reverseGeocodingReq ReverseGeocodingReq

	reverseGeocodingReq.Ak = "3bAjKGA0pv7qvszGe98RsVZ04Ob5r4ZZ"
	reverseGeocodingReq.Coordtype = "gcj02ll"
	reverseGeocodingReq.Output = "json"
	reverseGeocodingReq.RetCoordtype = "gcj02ll"
	reverseGeocodingReq.Location = strings.Join([]string{latitude, longitude}, ",")
	reverseGeocodingReq.Language = language

	url := "https://api.map.baidu.com/reverse_geocoding/v3/?ak=" + reverseGeocodingReq.Ak + "&output=" + reverseGeocodingReq.Output + "&coordtype=" + reverseGeocodingReq.Coordtype + "&location=" + reverseGeocodingReq.Location + "&ret_coordtype=" + reverseGeocodingReq.RetCoordtype + "&language=" + reverseGeocodingReq.Language
	resp, err := http.Get(url)

	if err != nil {
		return "", err
	}
	defer resp.Body.Close()
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return "", err
	}

	var results ReverseGeocodingRes
	err = json.Unmarshal(body, &results)

	if err != nil {
		return "", err
	}
	if results.Status != 0 {
		address = "未知地址"
		return address, err
	}

	address = results.Result.FormattedAddress

	return address, nil
}