<?php
/**
 * Service duration / price variant.
 *
 * @package Bookline
 */

declare( strict_types=1 );

namespace Bookline\Domain\Service;

use Bookline\Domain\Pricing\Money;
use Bookline\Domain\Shared\DomainException;

/**
 * One duration option for a service (e.g. 60 min £80).
 *
 * @since 0.1.0
 */
final class ServiceDuration {

	/**
	 * Constructor.
	 *
	 * @param int|null    $id           Database id.
	 * @param int         $service_id   Parent service.
	 * @param int         $duration_min Length in minutes.
	 * @param Money       $price        Price for this duration.
	 * @param string|null $label      Optional label.
	 * @param bool        $is_default   Default selection.
	 * @param int         $sort_order   Sort weight.
	 *
	 * @throws \Bookline\Domain\Shared\DomainException When invariants fail.
	 */
	public function __construct(
		private ?int $id,
		private int $service_id,
		private int $duration_min,
		private Money $price,
		private ?string $label,
		private bool $is_default,
		private int $sort_order,
	) {
		if ( $this->service_id < 1 ) {
			throw new DomainException( 'duration.service_id', 'service_id must be positive.' );
		}
		if ( $this->duration_min < 1 ) {
			throw new DomainException( 'duration.minutes', 'duration_min must be at least 1.' );
		}
		if ( $this->price->is_negative() ) {
			throw new DomainException( 'duration.price_negative', 'Duration price must not be negative.' );
		}
	}

	/**
	 * Database id.
	 *
	 * @since 0.1.0
	 */
	public function id(): ?int {
		return $this->id;
	}

	/**
	 * Service id.
	 *
	 * @since 0.1.0
	 */
	public function service_id(): int {
		return $this->service_id;
	}

	/**
	 * Duration min.
	 *
	 * @since 0.1.0
	 */
	public function duration_min(): int {
		return $this->duration_min;
	}

	/**
	 * Price.
	 *
	 * @since 0.1.0
	 */
	public function price(): Money {
		return $this->price;
	}

	/**
	 * Label.
	 *
	 * @since 0.1.0
	 */
	public function label(): ?string {
		return $this->label;
	}

	/**
	 * Is default.
	 *
	 * @since 0.1.0
	 */
	public function is_default(): bool {
		return $this->is_default;
	}

	/**
	 * Sort order.
	 *
	 * @since 0.1.0
	 */
	public function sort_order(): int {
		return $this->sort_order;
	}

	/**
	 * Assign the database id after insert.
	 *
	 * @param int $id New id.
	 *
	 * @throws \Bookline\Domain\Shared\DomainException When id is already set or invalid.
	 *
	 * @since 0.1.0
	 */
	public function assign_id( int $id ): void {
		if ( null !== $this->id ) {
			throw new DomainException( 'duration.id_assigned', 'Duration id is already assigned.' );
		}
		$this->id = $id;
	}
}