<?php
namespace AccessNow\SimpleLMS;

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

class Plugin {

	private static $instance = null;

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

	private function __construct() {
		$this->load_dependencies();
		$this->register_hooks();
	}

	private function load_dependencies() {
		$includes = ACCESSNOW_SLMS_PLUGIN_DIR . 'includes/';
		$admin    = ACCESSNOW_SLMS_PLUGIN_DIR . 'admin/';
		$public   = ACCESSNOW_SLMS_PLUGIN_DIR . 'public/';

		require_once $includes . 'class-settings.php';
		require_once $includes . 'class-upgrader.php';
		require_once $includes . 'class-post-types.php';
		require_once $includes . 'class-capabilities.php';
		require_once $includes . 'class-course-meta.php';
		require_once $includes . 'class-unit-meta.php';
		require_once $includes . 'class-lesson-header.php';
		require_once $includes . 'class-lesson-meta.php';
		require_once $includes . 'class-quiz-meta.php';
		require_once $includes . 'class-enrollment.php';
		require_once $includes . 'class-progress.php';
		require_once $includes . 'class-quiz-engine.php';
		require_once $includes . 'class-access-control.php';
		require_once $includes . 'class-certificates.php';
		require_once $includes . 'class-notifications.php';
		require_once $includes . 'class-notes.php';
		require_once $includes . 'class-gamification.php';
		require_once $includes . 'class-antispam.php';
		require_once $includes . 'class-rewrites.php';
		require_once $includes . 'class-content-integrity.php';
		require_once $includes . 'class-i18n.php';
		require_once $includes . 'class-blocks.php';

		if ( is_admin() ) {
			require_once $admin . 'class-admin.php';
			require_once $admin . 'class-metabox-course.php';
			require_once $admin . 'class-metabox-unit.php';
			require_once $admin . 'class-metabox-lesson.php';
			require_once $admin . 'class-metabox-quiz.php';
			require_once $admin . 'class-enrollment-admin.php';
			require_once $admin . 'class-reports.php';
			require_once $admin . 'class-csv-export.php';
			require_once $admin . 'class-dashboard-widget.php';
			require_once $admin . 'class-export-import.php';
			require_once $admin . 'class-help.php';
			require_once $admin . 'class-course-cloner.php';
		}

		require_once $public . 'class-frontend.php';
		require_once $public . 'class-template-loader.php';
		require_once $public . 'class-shortcodes.php';
		require_once $public . 'class-ajax.php';

		// Pre-5.0.0 class names (SLMS_*) for theme template overrides.
		require_once $includes . 'back-compat.php';
		register_legacy_class_aliases();
	}

	private function register_hooks() {
		Upgrader::init();

		Post_Types::init();
		Course_Meta::init();
		Unit_Meta::init();
		Lesson_Meta::init();
		Quiz_Meta::init();
		Enrollment::init();
		Progress::init();
		Quiz_Engine::init();
		Access_Control::init();
		Certificates::init();
		Notifications::init();
		Notes::init();
		Gamification::init();
		Antispam::init();
		Rewrites::init();
		Content_Integrity::init();

		if ( is_admin() ) {
			Admin::init();
			Metabox_Course::init();
			Metabox_Unit::init();
			Metabox_Lesson::init();
			Metabox_Quiz::init();
			Enrollment_Admin::init();
			Reports::init();
			Csv_Export::init();
			Dashboard_Widget::init();
			Export_Import::init();
			Help::init();
			Course_Cloner::init();
		}

		I18n::init();
		Frontend::init();
		Template_Loader::init();
		Shortcodes::init();
		Blocks::init();
		Ajax::init();
	}
}