package service

import (
	"errors"

	"shop-api/global"
	"shop-api/model"
	"shop-api/model/request"

	"gorm.io/gorm"
)

func ChangeCollectionGoods(uuid string, info request.SpuNo) (err error, id uint) {
	var (
		tmp             model.CollectionGoods
		collectionGoods model.CollectionGoods
	)
	err = global.MG_DB.Model(&model.TbGoods{}).Where("spu_no = ?", info.SpuNo).First(&model.TbGoods{}).Error
	if err != nil {
		return
	}
	tx := global.MG_DB.Begin()
	err = tx.Model(&model.CollectionGoods{}).Where("spu_no = ? AND create_by = ?", info.SpuNo, uuid).Find(&tmp).Error
	if err != nil {
		return
	}
	if tmp.ID == 0 {
		collectionGoods.SpuNo = info.SpuNo
		collectionGoods.CreateBy = uuid
		err = tx.Model(&model.CollectionGoods{}).Create(&collectionGoods).Error
		if err != nil {
			tx.Rollback()
			err = errors.New("收藏失败")
			return
		}
		// 商品收藏数+1
		err = tx.Model(&model.TbGoods{}).Where("spu_no = ?", info.SpuNo).UpdateColumn("collection_num", gorm.Expr("collection_num + 1")).Error
		if err != nil {
			tx.Rollback()
			return
		}
	} else {
		err = tx.Model(&model.CollectionGoods{}).Delete(&tmp).Error
		if err != nil {
			tx.Rollback()
			err = errors.New("取消收藏失败")
			return
		}
		// 任务收藏数-1
		err = tx.Model(&model.TbGoods{}).Where("spu_no = ? AND collection_num > 0", info.SpuNo).UpdateColumn("collection_num", gorm.Expr("collection_num - 1")).Error
		if err != nil {
			tx.Rollback()
			return
		}
	}
	tx.Commit()
	id = collectionGoods.ID
	return
}

func GetCollectionGoodsList(uuid string, info request.SearchCollectionGoods) (err error, list interface{}, total int64) {
	limit := info.PageSize
	offset := info.PageSize * (info.Page - 1)
	db := global.MG_DB.Model(&model.CollectionGoods{}).Joins("INNER JOIN mission ON mission.id = collection_mission.mission_id").
		Where("collection_mission.create_by = ?", uuid)
	err = db.Count(&total).Error
	var res []model.TbGoodsDetail
	err = db.Select("mission.id,mission.title,mission.goods_id,mission.goods_status,mission.num,mission.hire_type,mission.hire_money,mission.hire_ratio,mission.start_time,mission.end_time,mission.status").
		Preload("Goods", func(db *gorm.DB) *gorm.DB {
			return db.Select("id,spu_no,title,title_eng,images,tags")
		}).Limit(limit).Offset(offset).Find(&res).Error
	if err != nil {
		return err, nil, 0
	}
	for i := 0; i < len(res); i++ {
		res[i].CollectStatus = getGoodsCollectStatus(uuid, res[i].SpuNo)
	}
	return err, res, total
}

func getGoodsCollectStatus(uuid string, spuNo string) (result bool) {
	err := global.MG_DB.Model(&model.CollectionGoods{}).Where("create_by = ? AND spu_no = ?", uuid, spuNo).First(&model.CollectionGoods{}).Error
	if err != nil {
		return false
	}
	return true
}