package service

import (
	"electricity_bill_calc/global"
	"electricity_bill_calc/model"
	"electricity_bill_calc/repository"

	"xorm.io/builder"
)

type _RegionService struct{}

var RegionService _RegionService

func (_RegionService) FetchSubRegions(parent string) ([]model.Region, error) {
	regions := make([]model.Region, 0)
	err := global.DBConn.Where(builder.Eq{"parent": parent}).Asc("code").Find(&regions)
	if err != nil {
		return make([]model.Region, 0), err
	}
	return regions, err
}

func (_RegionService) FetchAllParentRegions(code string) ([]model.Region, error) {
	regions := make([]model.Region, 0)
	region, err := repository.RegionRepo.FetchRegion(code)
	if err != nil {
		return regions, err
	}
	regions = append(regions, *region)
	for region.Level > 1 {
		region, err = repository.RegionRepo.FetchRegion(region.Parent)
		if err != nil {
			return make([]model.Region, 0), nil
		}
		regions = append(regions, *region)
	}
	return regions, nil
}