<?php

declare(strict_types=1);

namespace LIT\MCP\Integrations\WordPress\Schema;

defined('ABSPATH') || exit;

/**
 * Fields registered with register_meta()/register_post_meta().
 */
final class RegisteredMetaSource extends MetaFieldSource
{
    private const TYPES = ['string', 'boolean', 'integer', 'number', 'array', 'object'];

    /** @param bool $readOnly Report every key as READONLY (Pods is active but cannot be used to write its keys). */
    public function __construct(private bool $readOnly = false)
    {
    }

    public function id(): string
    {
        return 'meta';
    }

    public function fieldsFor(string $postType): array
    {
        $keys = array_merge(get_registered_meta_keys('post', ''), get_registered_meta_keys('post', $postType));
        $fields = [];
        foreach ($keys as $key => $args) {
            $key = (string) $key;
            $args = is_array($args) ? $args : [];
            $type = (string) ($args['type'] ?? 'string');
            $readonly = $this->readOnly || (is_protected_meta($key, 'post') && empty($args['show_in_rest']));

            $fields[] = new FieldDefinition(
                $key,
                $key,
                in_array($type, self::TYPES, true) ? $type : 'unknown',
                'meta',
                $readonly ? FieldDefinition::READONLY : FieldDefinition::WRITABLE,
                false,
                ! (bool) ($args['single'] ?? false),
                null,
                null,
                (string) ($args['description'] ?? '')
            );
        }

        return $fields;
    }
}