// 库区服务
// 职责：库区CRUD、状态更新(联动库位状态)
// 调用链：UpdateStatus → BatchUpdateLocationStatus(状态联动)
// 紧密耦合：dao.Zone、dao.Location(级联状态更新、删除前检查)
// 注意：删除前检查是否存在库位，启用/禁用联动库位状态
package service

import (
	"assets/consts/stock"
	dao "assets/dao/stock"
	dto "assets/model/dto/stock"
	"context"

	"gitea.com/red-future/common/utils"
	"github.com/gogf/gf/v2/errors/gerror"
	"go.mongodb.org/mongo-driver/v2/bson"
)

type zone struct{}

var Zone = new(zone)

func (s *zone) Create(ctx context.Context, req *dto.CreateZoneReq) (res *dto.CreateZoneRes, err error) {
	ids, err := dao.Zone.Insert(ctx, req)
	if err != nil {
		return
	}
	id := ids[0].(bson.ObjectID)
	res = &dto.CreateZoneRes{
		Id: &id,
	}
	return
}

func (s *zone) Update(ctx context.Context, req *dto.UpdateZoneReq) error {
	return dao.Zone.Update(ctx, req)
}

func (s *zone) Delete(ctx context.Context, req *dto.DeleteZoneReq) error {
	zoneId := req.Id.Hex()
	// 删除前检查：是否存在关联的库位
	count, err := dao.Zone.CountLocationsByZoneId(ctx, zoneId)
	if err != nil {
		return err
	}
	if count > 0 {
		return gerror.Newf("库区下存在%d个库位，无法删除", count)
	}
	return dao.Zone.DeleteFake(ctx, req)
}

// UpdateStatus 更新库区状态（单独的状态修改接口，联动子表）
func (s *zone) UpdateStatus(ctx context.Context, req *dto.UpdateZoneStatusReq) (err error) {
	zoneId := req.Id.Hex()
	// 1. 更新库区状态
	if err = dao.Zone.UpdateStatus(ctx, req); err != nil {
		return
	}
	// 2. 联动更新库位状态
	if req.Status == stock.ZoneStatusEnabled {
		// 启用：只恢复Disabled状态的库位，保留InUse等其他状态
		if _, err = dao.Zone.BatchUpdateLocationStatus(ctx, zoneId, stock.LocationStatusIdle, stock.LocationStatusDisabled); err != nil {
			return
		}
	} else {
		// 禁用：所有库位统一设为Disabled
		if _, err = dao.Zone.BatchUpdateLocationStatus(ctx, zoneId, stock.LocationStatusDisabled); err != nil {
			return
		}
	}
	return
}

func (s *zone) GetOne(ctx context.Context, req *dto.GetZoneReq) (res *dto.GetZoneRes, err error) {
	one, err := dao.Zone.GetOne(ctx, req)
	if err != nil {
		return
	}
	err = utils.Struct(one, &res)
	return
}

func (s *zone) List(ctx context.Context, req *dto.ListZoneReq) (res *dto.ListZoneRes, err error) {
	list, total, err := dao.Zone.List(ctx, req)
	if err != nil {
		return
	}
	res = &dto.ListZoneRes{
		Total: total,
	}
	err = utils.Struct(list, &res.List)
	return
}