<?php
/**
 * Registry of notification template variables.
 *
 * @package Bookline
 */

declare( strict_types=1 );

namespace Bookline\Domain\Notification;

/**
 * Admin palette + resolution source.
 *
 * WordPress filters live in Application/Infrastructure — Domain stays pure.
 *
 * @since 0.1.0
 */
final class VariableRegistry {

	/**
	 * Definitions keyed by variable key.
	 *
	 * @var array<string, VariableDefinition>
	 */
	private array $variables = [];

	/**
	 * Register a variable definition.
	 *
	 * @param VariableDefinition $variable Variable.
	 *
	 * @since 0.1.0
	 */
	public function register( VariableDefinition $variable ): void {
		$this->variables[ $variable->key() ] = $variable;
	}

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

	/**
	 * Build a bag from a context.
	 *
	 * @param VariableContext $context Context.
	 *
	 * @since 0.1.0
	 */
	public function resolve( VariableContext $context ): VariableBag {
		$values = [];
		foreach ( $this->all() as $variable ) {
			$values[ $variable->key() ] = $variable->resolve( $context );
		}

		return new VariableBag( $values );
	}
}