package domain

import (
	"errors"
	"fmt"
	"strings"
)

var (
	ErrOrderAlreadyExist = errors.New("order already exist")
	ErrOrderNotFound     = errors.New("order not found")
	ErrInvalidOrderData  = errors.New("invalid order data")
)

type Order struct {
	ID       string
	Item     string
	Quantity int32
}

func (o *Order) Validate() error {
	if strings.TrimSpace(o.Item) == "" {
		return fmt.Errorf("%w: item cannot be empty", ErrInvalidOrderData)
	}
	if o.Quantity <= 0 {
		return fmt.Errorf("%w: quantity must be positive", ErrInvalidOrderData)
	}
	if o.ID == "" {
		return fmt.Errorf("%w: ID cannot be empty", ErrInvalidOrderData)
	}
	return nil
}