package entities

import (
	"time"
)

// PaymentAllocation merepresentasikan hasil FIFO matching dari 1 payment ke
// tepat 1 sub-row anak (purchase_item / marketing_delivery_product /
// expense_realization). DB constraint memastikan hanya satu FK yang non-null.
type PaymentAllocation struct {
	Id                         uint64    `gorm:"primaryKey;autoIncrement"`
	PaymentId                  uint      `gorm:"not null;index"`
	PurchaseItemId             *uint     `gorm:"column:purchase_item_id"`
	MarketingDeliveryProductId *uint     `gorm:"column:marketing_delivery_product_id"`
	ExpenseRealizationId       *uint64   `gorm:"column:expense_realization_id"`
	Amount                     float64   `gorm:"type:numeric(15,3);not null"`
	AllocatedAt                time.Time `gorm:"type:timestamptz;not null;default:NOW()"`

	Payment                  *Payment                  `gorm:"foreignKey:PaymentId;references:Id"`
	PurchaseItem             *PurchaseItem             `gorm:"foreignKey:PurchaseItemId;references:Id"`
	MarketingDeliveryProduct *MarketingDeliveryProduct `gorm:"foreignKey:MarketingDeliveryProductId;references:Id"`
	ExpenseRealization       *ExpenseRealization       `gorm:"foreignKey:ExpenseRealizationId;references:Id"`
}