package domain

import (
	"fmt"
	"time"
)

type Order struct {
	OrderID    string
	CustomerID string
	Amount     float64
	CreatedAt  time.Time
}

func (o *Order) Validate() error {
	if o.OrderID == "" {
		return fmt.Errorf("order_id is required")
	}
	if o.CustomerID == "" {
		return fmt.Errorf("customer_id is required")
	}
	if o.Amount <= 0 {
		return fmt.Errorf("amount must be positive")
	}
	return nil
}

func (o *Order) NaturalKey() string {
	return fmt.Sprintf("%s_%s_%d", o.OrderID, o.CustomerID, o.CreatedAt.Unix())
}