package common

import (
	"mtp2_if/global/app"
	"mtp2_if/global/e"
	"mtp2_if/logger"
	"mtp2_if/models"
	"net/http"

	"github.com/gin-gonic/gin"
)

// QueryProvincesAndCitiesReq 查询省市信息请求参数
type QueryProvincesAndCitiesReq struct {
	ProvinceID int `form:"provinceID"` // 省ID
}

// QueryProvincesAndCitiesRsp 查询省市信息返回模型
type QueryProvincesAndCitiesRsp struct {
	Province models.Division   // 省
	Cities   []models.Division // 市
}

// QueryProvincesAndCities 查询省市信息（不包括区）
// @Summary 查询省市信息（不包括区）
// @Produce json
// @Param provinceID query int false "省ID"
// @Success 200 {object} QueryProvincesAndCitiesRsp
// @Failure 500 {object} app.Response
// @Router /Common/QueryProvincesAndCities [get]
// @Tags 通用服务
func QueryProvincesAndCities(c *gin.Context) {
	appG := app.Gin{C: c}

	// 获取请求参数
	var req QueryProvincesAndCitiesReq
	if err := appG.C.ShouldBindQuery(&req); err != nil {
		logger.GetLogger().Errorf("QueryProvincesAndCities failed: %s", err.Error())
		appG.Response(http.StatusBadRequest, e.INVALID_PARAMS, nil)
		return
	}

	// 获取省市信息
	provinces, err := models.GetProvincesAndCities(req.ProvinceID)
	if err != nil {
		// 查询失败
		logger.GetLogger().Errorf("QueryProvincesAndCities failed: %s", err.Error())
		appG.Response(http.StatusBadRequest, e.ERROR_QUERY_FAIL, nil)
		return
	}

	// 分解省市数据
	// Golang Map元素取址问题： cannot assign to struct field XXXX in map
	// https://blog.csdn.net/makenothing/article/details/105037977
	pMap := make(map[string]*QueryProvincesAndCitiesRsp)
	// 构建省节点
	for _, v := range provinces {
		if v.Divisionlevel == "province" {
			pMap[v.Divisioncode] = &QueryProvincesAndCitiesRsp{Province: v, Cities: make([]models.Division, 0)}
		}
	}
	// 为省节点增加市信息
	for _, v := range provinces {
		if v.Divisionlevel == "city" {
			pMap[v.Parentcode].Cities = append(pMap[v.Parentcode].Cities, v)
		}
	}

	// map to slice
	rst := make([]QueryProvincesAndCitiesRsp, 0)
	for _, v := range pMap {
		rst = append(rst, *v)
	}

	// 查询成功
	logger.GetLogger().Debugln("QueryProvincesAndCities successed: %v", rst)
	appG.Response(http.StatusOK, e.SUCCESS, rst)
}