<?php
declare(strict_types=1);

namespace Cf7stg;

final class Plugin
{
    private static ?Plugin $instance = null;

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

    public static function register_autoloader(): void
    {
        spl_autoload_register(static function (string $class): void {
            if (strpos($class, 'Cf7stg\\') !== 0) return;
            $relative = substr($class, strlen('Cf7stg\\'));
            $slug = strtolower(preg_replace('/([a-z0-9])([A-Z])/', '$1-$2', $relative));
            // Class names may use underscores (Settings_Page, Interface_Spam_Source);
            // normalize both word-boundary conventions to hyphens.
            $slug = str_replace('_', '-', $slug);
            $candidates = [
                dirname(__DIR__) . '/includes/class-' . $slug . '.php',
                dirname(__DIR__) . '/includes/sources/class-' . $slug . '.php',
                dirname(__DIR__) . '/admin/class-' . $slug . '.php',
                // Fallback: treat slug as full filename (for Interface_* classes
                // whose slug already becomes 'interface-xxx').
                dirname(__DIR__) . '/includes/' . $slug . '.php',
                dirname(__DIR__) . '/includes/sources/' . $slug . '.php',
                dirname(__DIR__) . '/admin/' . $slug . '.php',
            ];
            foreach ($candidates as $path) {
                if (is_file($path)) {
                    require_once $path;
                    return;
                }
            }
        });
    }

    public function boot(): void
    {
        // Register runtime hooks
        Dispatcher::register_hooks();
        (new CF7Source())->register();

        // Admin
        if (is_admin()) {
            (new Settings_Page())->register();
            (new Dashboard_Widget())->register();
        }
    }
}