<?php
/**
 * Plugin core bootstrap class.
 *
 * @package BreznFlow
 * @since   1.0.0
 */

namespace BreznFlow;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Singleton core class that loads dependencies and registers hooks.
 *
 * @since 1.0.0
 */
class Core {
	/**
	 * Singleton instance.
	 *
	 * @var Core|null
	 */
	private static ?Core $instance = null;

	/**
	 * Returns the singleton instance.
	 *
	 * @since  1.0.0
	 * @return self
	 */
	public static function instance(): self {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	/**
	 * Initializes the plugin by loading dependencies and hooks.
	 *
	 * @since  1.0.0
	 * @return void
	 */
	public function init(): void {
		$this->load_dependencies();
		$this->register_hooks();
	}

	/**
	 * Loads all required class files.
	 *
	 * @since 1.0.0
	 * @return void
	 */
	private function load_dependencies(): void {
		// Security.
		require_once BREZNFLOW_DIR . 'includes/Security/MaskingRules.php';
		require_once BREZNFLOW_DIR . 'includes/Security/WorkflowValidator.php';
		require_once BREZNFLOW_DIR . 'includes/Security/WorkflowSanitizer.php';

		// Post type.
		require_once BREZNFLOW_DIR . 'includes/PostType.php';

		// Features.
		require_once BREZNFLOW_DIR . 'includes/Features/NodeTypeRegistry.php';
		require_once BREZNFLOW_DIR . 'includes/Features/NodeCategorizer.php';
		require_once BREZNFLOW_DIR . 'includes/Features/InfoBoxBuilder.php';
		require_once BREZNFLOW_DIR . 'includes/Features/ViewCounter.php';
		require_once BREZNFLOW_DIR . 'includes/Features/RelatedWorkflows.php';
		require_once BREZNFLOW_DIR . 'includes/Features/ThemeRegistry.php';
		require_once BREZNFLOW_DIR . 'includes/Features/ThemeImporter.php';

		// Shortcode, download & embed.
		require_once BREZNFLOW_DIR . 'includes/Shortcode.php';
		require_once BREZNFLOW_DIR . 'includes/DownloadHandler.php';
		require_once BREZNFLOW_DIR . 'includes/EmbedHandler.php';

		// SettingsPage is loaded always because Shortcode::render() calls SettingsPage::get_defaults() on the frontend.
		require_once BREZNFLOW_DIR . 'includes/Admin/SettingsPage.php';

		// Admin-only classes.
		if ( is_admin() ) {
			require_once BREZNFLOW_DIR . 'includes/Admin/AdminMenu.php';
			require_once BREZNFLOW_DIR . 'includes/Admin/WizardPage.php';
			require_once BREZNFLOW_DIR . 'includes/Admin/WorkflowListTable.php';
		}
	}

	/**
	 * Instantiates components and registers their hooks.
	 *
	 * @since 1.0.0
	 * @return void
	 */
	private function register_hooks(): void {
		( new PostType() )->register();
		( new Shortcode() )->register();
		( new DownloadHandler() )->register();
		( new EmbedHandler() )->register();
		( new Features\ViewCounter() )->register();
		( new Features\RelatedWorkflows() )->register();

		if ( is_admin() ) {
			( new Admin\AdminMenu() )->register();
			( new Admin\SettingsPage() )->register();
			( new Admin\WizardPage() )->register();
		}
	}
}