<?php

declare(strict_types=1);

namespace LIT\MCP\Integrations\WordPress;

/**
 * Restore point before a change (spec §2 principle 7): WordPress stores the
 * current state as a revision (only if it differs from the newest one) and the
 * newest revision ID is returned as revision_id of the ToolResult.
 * Note: revisions cover title, content and excerpt; meta and terms are not revisioned.
 */
final class RevisionPoint
{
    public static function capture(int $postId): ?int
    {
        wp_save_post_revision($postId);

        return self::latest($postId);
    }

    public static function latest(int $postId): ?int
    {
        $revisions = wp_get_post_revisions($postId, ['posts_per_page' => 1]);
        $newest = is_array($revisions) ? reset($revisions) : false;

        return is_object($newest) ? (int) $newest->ID : null;
    }
}