package amap

import (
	"encoding/json"
	"fmt"
	"git.qianqiusoft.com/qianqiusoft/light-apiengine/utils"
	"github.com/pkg/errors"
)

const(
	__AMAP_API_ENDPOINT = "https://restapi.amap.com"
	__KEY = "427befed1b2db94d6753b679d7330772"
)

type AMapClient struct{
	Key string
}

/**
 * @brief: 逆地理编码
 * @param1 lngLats: 经纬度列表，{lng1,lat1,lng2,lat2}
 * @return1: 逆转换结果
 * @return2: 错误信息
 */
func (a *AMapClient)Regeo(lngLats []string)(*RegeoResult, error){
	if lngLats == nil || len(lngLats) == 0{
		return nil, errors.New("参数lnglats为空")
	}
	if len(lngLats) % 2 != 0{
		return nil, errors.New("参数lnglats长度必须为2的倍数")
	}
	path := "/geocode/regeo"
	location := ""
	location = fmt.Sprintf("%s,%s", lngLats[0], lngLats[1])
	for i := 2; i < len(lngLats); i += 2 {
		location += "|" + fmt.Sprintf("%s,%s", lngLats[i], lngLats[i+1])
	}

	params := make(map[string]string)
	params["location"] = location
	params["batch"] = "true"

	fullUrl := a.getFullUrl(path, params)
	bytess, err := utils.NewHttpUtil().Get(fullUrl, nil, nil)
	if err != nil{
		return nil, err
	}

	regeoResult := &RegeoResult{}
	err = json.Unmarshal(bytess, regeoResult)
	if err != nil{
		return nil, err
	}

	return regeoResult, nil
}

/**
 * @brief: 坐标转换
 * @param1 lngLats: 经纬度列表
 * @param2 coordType: 坐标类型 gps;mapbar;baidu;autonavi
 * @return1: 坐标转回结果
 * @return2: 错误信息
 */
func (a *AMapClient)ConvCoord(lngLats []string, coordType string)(*ConvCoordResult, error){
	locations := a.getLocations(lngLats)

	params := make(map[string]string)
	params["locations"] = locations
	params["coordsys"] = coordType

	path := "/assistant/coordinate/convert"

	fullUrl := a.getFullUrl(path, params)
	bytess, err := utils.NewHttpUtil().Get(fullUrl, nil, nil)
	if err != nil{
		return nil, err
	}

	result := &ConvCoordResult{}
	err = json.Unmarshal(bytess, result)
	if err != nil{
		return nil, err
	}

	return result, nil
}

/**
 * @brief: 获取天气
 * @param1 city: 区编码
 * @param2 forecast: 是否预报天汽水
 * @return1: 天气结果
 * @return2: 错误信息
 */
func (a *AMapClient)FetchWeather(city string, live bool)(*WeatherResult, error){
	params := make(map[string]string)
	params["city"] = city
	if !live{
		params["extensions"] = "all"
	}

	path := "/weather/weatherInfo"

	fullUrl := a.getFullUrl(path, params)
	bytess, err := utils.NewHttpUtil().Get(fullUrl, nil, nil)
	if err != nil{
		return nil, err
	}

	result := &WeatherResult{}
	err = json.Unmarshal(bytess, result)
	if err != nil{
		return nil, err
	}

	return result, nil
}

/**
 * @brief: 根据ip获取地址信息
 * @param1 ip: ip，空标识使用请求ip获取地址
 */
func (a *AMapClient)FectionLocationByIp(ip string)(*IpResult, error){
	if ip == ""{
		return nil, errors.New("ip不能为空")
	}
	params := make(map[string]string)
	params["ip"] = ip

	path := "/ip"
	fullUrl := a.getFullUrl(path, params)
	bytess, err := utils.NewHttpUtil().Get(fullUrl, nil, nil)
	if err != nil{
		return nil, err
	}

	result := &IpResult{}
	err = json.Unmarshal(bytess, result)
	if err != nil{
		return nil, err
	}

	return result, nil
}

/**
 * @brief: 获取完全url
 * @param1 path: 请求path
 * @param2 params: 参数
 */
func (a *AMapClient)getFullUrl(path string, params map[string]string)string{
	version := "v3"
	paramsStr := ""
	params["key"] = a.Key
	for k, v := range params{
		paramsStr += fmt.Sprintf("%s=%s&", k, v)
	}

	return __AMAP_API_ENDPOINT + "/" + version + path + "?" + paramsStr
}

/**
 * @brief: 多个坐标转换程参数形式
 * @param1 lngLats: 坐标列表
 * @return1: 坐标结果 lng1,lat1|lng2,lat2
 */
func (a *AMapClient)getLocations(lngLats []string)string{
	location := ""
	location = fmt.Sprintf("%s,%s", lngLats[0], lngLats[1])
	for i := 2; i < len(lngLats); i += 2 {
		location += "|" + fmt.Sprintf("%s,%s", lngLats[i], lngLats[i+1])
	}

	return location
}