<?php

declare(strict_types=1);

namespace VPlugins\WPCloudClient\Handler;

final class HandlerRegistry {

	/**
	 * Registered handlers keyed by action name.
	 *
	 * @var array<string, HandlerInterface>
	 */
	private array $handlers = [];

	/**
	 * Register a handler for its action.
	 *
	 * @param HandlerInterface $handler Handler to register.
	 * @return void
	 */
	public function register( HandlerInterface $handler ): void {
		$this->handlers[ $handler->action() ] = $handler;
	}

	/**
	 * Retrieve a handler by action name.
	 *
	 * @param string $action Action name.
	 * @return HandlerInterface|null Handler instance or null if not found.
	 */
	public function get( string $action ): ?HandlerInterface {
		return $this->handlers[ $action ] ?? null;
	}

	/**
	 * Return all registered action names.
	 *
	 * @return list<string> Action names.
	 */
	public function actions(): array {
		return array_keys( $this->handlers );
	}
}