<?php
/**
 * Condition registry (docs/20 §11).
 *
 * @package Bookline
 */

declare( strict_types=1 );

namespace Bookline\Domain\Automation;

/**
 * Typed condition collection.
 *
 * @since 0.1.0
 */
final class AutomationConditionRegistry {

	/**
	 * Conditions keyed by identifier.
	 *
	 * @var array<string, AutomationCondition>
	 */
	private array $items = [];

	/**
	 * Register.
	 *
	 * @param AutomationCondition $condition Condition.
	 *
	 * @since 0.1.0
	 */
	public function register( AutomationCondition $condition ): void {
		$this->items[ $condition->identifier() ] = $condition;
	}

	/**
	 * Find.
	 *
	 * @param string $identifier Identifier.
	 *
	 * @since 0.1.0
	 */
	public function get( string $identifier ): ?AutomationCondition {
		return $this->items[ $identifier ] ?? null;
	}

	/**
	 * All.
	 *
	 * @return list<AutomationCondition>
	 *
	 * @since 0.1.0
	 */
	public function all(): array {
		return array_values( $this->items );
	}

	/**
	 * Compatible with a subject type.
	 *
	 * @param SubjectType $subject Subject.
	 * @return list<AutomationCondition>
	 *
	 * @since 0.1.0
	 */
	public function for_subject( SubjectType $subject ): array {
		$out = [];
		foreach ( $this->items as $condition ) {
			if ( in_array( $subject, $condition->subject_types(), true ) ) {
				$out[] = $condition;
			}
		}
		return $out;
	}
}