<?php
namespace JVBase\managers\SEO;

use JVBase\managers\SEO\schemas\SchemaResolverInterface;
use JVBase\managers\SEO\schemas\resolvers\BaseResolver;

/**
 * Registry mapping schema types to their resolvers.
 * Like Queue's TypeRegistry maps operation types to executors.
 */
class SchemaResolverRegistry
{
	private static ?self $instance = null;
	private array $resolvers = [];
	private BaseResolver $default;

	private function __construct()
	{
		$this->default = new BaseResolver();
		$this->registerDefaults();

		do_action(BASE . 'schema_resolvers_loaded', $this);
	}

	public static function getInstance(): self
	{
		if (self::$instance === null) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	public function register(string $schemaType, SchemaResolverInterface $resolver): void
	{
		$this->resolvers[$schemaType] = $resolver;
	}

	public function get(string $schemaType): SchemaResolverInterface
	{
		// Check exact match, then parent chain
		if (isset($this->resolvers[$schemaType])) {
			return $this->resolvers[$schemaType];
		}

		// Check parent type (TattooParlor → LocalBusiness → Organization)
		$builder = SchemaBuilder::getInstance();
		$typeDef = $builder->getTypeDefinition($schemaType);
		if ($typeDef && !empty($typeDef['extends'])) {
			return $this->get($typeDef['extends']);
		}

		return $this->default;
	}

	private function registerDefaults(): void
	{
		// Register type-specific resolvers
		// Extensible via the action hook above
	}
}