<?php
/**
 * Directory catalogue: seven named service fields.
 *
 * There is no eighth service property to assign. The commercial pack
 * replaces this file with a plan-sized occupancy list.
 *
 * @package Bookline
 */

declare( strict_types=1 );

namespace Bookline\Config;

use Bookline\Domain\Edition\EditionDimension;
use Bookline\Domain\Edition\EditionLimitReached;
use Bookline\Domain\Service\Service;

/**
 * Seven named service fields.
 *
 * @since 1.0.1
 */
final class ServicePlaces {

	/**
	 * Hydrate named fields from occupied slots (keys 1–7).
	 *
	 * @param array<int, Service> $occupied_by_slot Slot number => occupant.
	 */
	public static function from_occupied( array $occupied_by_slot ): self {
		return new self(
			$occupied_by_slot[1] ?? null,
			$occupied_by_slot[2] ?? null,
			$occupied_by_slot[3] ?? null,
			$occupied_by_slot[4] ?? null,
			$occupied_by_slot[5] ?? null,
			$occupied_by_slot[6] ?? null,
			$occupied_by_slot[7] ?? null
		);
	}

	/**
	 * Bind the seven named service fields.
	 *
	 * @param Service|null $service_1 First service field.
	 * @param Service|null $service_2 Second service field.
	 * @param Service|null $service_3 Third service field.
	 * @param Service|null $service_4 Fourth service field.
	 * @param Service|null $service_5 Fifth service field.
	 * @param Service|null $service_6 Sixth service field.
	 * @param Service|null $service_7 Seventh service field.
	 */
	public function __construct(
		private ?Service $service_1 = null,
		private ?Service $service_2 = null,
		private ?Service $service_3 = null,
		private ?Service $service_4 = null,
		private ?Service $service_5 = null,
		private ?Service $service_6 = null,
		private ?Service $service_7 = null,
	) {}

	/**
	 * Occupy the first empty named field.
	 *
	 * @param Service $service Incoming service.
	 * @return int Slot number 1–7.
	 *
	 * @throws EditionLimitReached When service_1 … service_7 are all set.
	 */
	public function place( Service $service ): int {
		if ( null === $this->service_1 ) {
			$this->service_1 = $service;
			return 1;
		}
		if ( null === $this->service_2 ) {
			$this->service_2 = $service;
			return 2;
		}
		if ( null === $this->service_3 ) {
			$this->service_3 = $service;
			return 3;
		}
		if ( null === $this->service_4 ) {
			$this->service_4 = $service;
			return 4;
		}
		if ( null === $this->service_5 ) {
			$this->service_5 = $service;
			return 5;
		}
		if ( null === $this->service_6 ) {
			$this->service_6 = $service;
			return 6;
		}
		if ( null === $this->service_7 ) {
			$this->service_7 = $service;
			return 7;
		}
		throw new EditionLimitReached( EditionDimension::Service, 7 );
	}
}