package model

import "time"

type PromoCodeUsage struct {
	Id          int       `json:"id" gorm:"primaryKey;autoIncrement"`
	PromoCodeId int       `json:"promo_code_id" gorm:"not null;index:idx_promo_code_user,unique"`
	UserId      int       `json:"user_id" gorm:"not null;index:idx_promo_code_user,unique"`
	UsedAt      time.Time `json:"used_at" gorm:"not null"`
}

func (PromoCodeUsage) TableName() string {
	return "promo_code_usages"
}

func (u *PromoCodeUsage) Insert() error {
	return DB.Create(u).Error
}

func GetPromoCodeUsageByCodeAndUser(promoCodeId int, userId int) (*PromoCodeUsage, error) {
	var usage PromoCodeUsage
	err := DB.Where("promo_code_id = ? AND user_id = ?", promoCodeId, userId).First(&usage).Error
	return &usage, err
}

func GetPromoCodeUsages(page int, pageSize int, promoCodeId int) ([]PromoCodeUsage, int64, error) {
	var usages []PromoCodeUsage
	var total int64
	query := DB.Model(&PromoCodeUsage{}).Where("promo_code_id = ?", promoCodeId)
	if err := query.Count(&total).Error; err != nil {
		return nil, 0, err
	}
	if page < 1 {
		page = 1
	}
	if pageSize < 1 {
		pageSize = 20
	}
	err := query.Order("id DESC").Offset((page - 1) * pageSize).Limit(pageSize).Find(&usages).Error
	return usages, total, err
}