package services

import (
	"platform/web/core"
	m "platform/web/models"
	q "platform/web/queries"
	"time"

	"gorm.io/gen/field"
)

var ProductDiscount = &productDiscountService{}

type productDiscountService struct{}

func (s *productDiscountService) All() (result []*m.ProductDiscount, err error) {
	return q.ProductDiscount.Order(q.ProductDiscount.CreatedAt.Desc()).Find()
}

func (s *productDiscountService) Page(req *core.PageReq) (result []*m.ProductDiscount, count int64, err error) {
	return q.ProductDiscount.Order(q.ProductDiscount.CreatedAt.Desc()).FindByPage(req.GetOffset(), req.GetLimit())
}

func (s *productDiscountService) Create(data CreateProductDiscountData) (err error) {
	return q.ProductDiscount.Create(&m.ProductDiscount{
		Name:     data.Name,
		Discount: data.Discount,
	})
}

type CreateProductDiscountData struct {
	Name     string `json:"name"`
	Discount int32  `json:"discount" validate:"min=0,max=100"`
}

func (s *productDiscountService) Update(data UpdateProductDiscountData) (err error) {
	do := make([]field.AssignExpr, 0)

	if data.Name != nil {
		do = append(do, q.ProductDiscount.Name.Value(*data.Name))
	}
	if data.Discount != nil {
		do = append(do, q.ProductDiscount.Discount.Value(*data.Discount))
	}

	_, err = q.ProductDiscount.Where(q.ProductDiscount.ID.Eq(data.ID)).UpdateSimple(do...)
	return err
}

type UpdateProductDiscountData struct {
	ID       int32   `json:"id"`
	Name     *string `json:"name"`
	Discount *int32  `json:"discount" validate:"omitempty,min=0,max=100"`
}

func (s *productDiscountService) Delete(id int32) (err error) {
	_, err = q.ProductDiscount.Where(q.ProductDiscount.ID.Eq(id)).UpdateColumn(q.ProductDiscount.DeletedAt, time.Now())
	return
}