package gmodel

import (
	"context"
)

type RelaFsShoppingCart struct {
	FsShoppingCart
	ShoppingCartProduct            *FsProduct          `json:"shopping_cart_product" gorm:"foreignkey:product_id;references:id"`
	ShoppingCartProductPriceList   []*FsProductPrice   `json:"shopping_cart_product_price_list" gorm:"foreignkey:product_id;references:product_id"`
	ShoppingCartProductModel3dList []*FsProductModel3d `json:"shopping_cart_product_model3d_list" gorm:"foreignkey:product_id;references:product_id"`
}

// 获取单个
func (s *FsShoppingCartModel) FindOne(ctx context.Context, id int64, fields ...string) (resp *FsShoppingCart, err error) {
	db := s.db.WithContext(ctx).Where("id = ?", id)
	if len(fields) > 0 {
		db = db.Select(fields[0])
	}
	err = db.Take(&resp).Error
	return resp, err
}

// 获取用户购物车指定item
func (s *FsShoppingCartModel) FineOneUserCart(ctx context.Context, id, userId int64, fields ...string) (resp *FsShoppingCart, err error) {
	db := s.db.WithContext(ctx).Where("user_id = ? and id = ?", userId, id)
	if len(fields) > 0 {
		db = db.Select(fields[0])
	}
	err = db.Take(&resp).Error
	return resp, err
}

// 创建
func (s *FsShoppingCartModel) Create(ctx context.Context, data *FsShoppingCart) error {
	return s.db.WithContext(ctx).Create(&data).Error
}

// 更新
func (s *FsShoppingCartModel) Update(ctx context.Context, id, userId int64, data *FsShoppingCart) error {
	return s.db.WithContext(ctx).Where("user_id = ? and id = ?", userId, id).Updates(&data).Error
}

// 获取用户购物车数量
func (s *FsShoppingCartModel) CountUserCart(ctx context.Context, userId int64) (total int64, err error) {
	err = s.db.WithContext(ctx).Where("user_id = ?", userId).Limit(1).Count(&total).Error
	return total, err
}

// 获取多个
func (s *FsShoppingCartModel) GetAllByIds(ctx context.Context, ids []int64, sort string, fields ...string) (resp []FsShoppingCart, err error) {
	if len(ids) == 0 {
		return
	}
	db := s.db.WithContext(ctx).Where("id in (?)", ids)
	if len(fields) > 0 {
		db = db.Select(fields[0])
	}
	if sort != "" {
		db = db.Order(sort)
	}
	err = db.Find(&resp).Error
	return resp, err
}

// 获取用户所有的购物车
type GetAllCartsByParamReq struct {
	Ids    []int64 //id集合
	UserId int64   //用户id
	Fields string  //筛选的字段
	Sort   string  //排序
	Page   int     //当前页
	Limit  int     //每页数量
}

func (s *FsShoppingCartModel) GetAllCartsByParam(ctx context.Context, req GetAllCartsByParamReq) (resp []FsShoppingCart, total int64, err error) {
	db := s.db.WithContext(ctx)
	if req.UserId > 0 {
		db = db.Where("user_id = ?", req.UserId)
	}
	if len(req.Ids) > 0 {
		db = db.Where("id in (?)", req.Ids)
	}
	if req.Fields != "" {
		db = db.Select(req.Fields)
	}
	if req.Sort != "" {
		db = db.Order(req.Sort)
	}
	//查询数量
	if err = db.Limit(1).Count(&total).Error; err != nil {
		return nil, 0, err
	}
	offset := (req.Page - 1) * req.Limit
	err = db.Offset(offset).Limit(req.Limit).Find(&resp).Error
	return resp, total, err
}