final class Application {


	public $version = '1.0.0';

	protected static $_instance = null;

	public $path;
	public $url;
	public $basename;

	//Module
	public $core;
	public $admin;
	private $post_type;
	private $resources;
	private $ajax;
	private $localize_script;
	private $metabox;
	private $course_builder;
	private $course_curriculum;
	private $template;
	private $permalinks;
	private $lecture;
	private $discussion;
	private $dashboard;
	public $shortcode;
	private $user;
	private $withdrawal;
	private $course_gate;
	private $wishlist;

	private $quiz;

	//Factory

	/**
	 * Course Factory Instance
	 *
	 * @var Course
	 */
	public $course_factory = null;


	//Integration

	/**
	 * WooCommerce integration class instance
	 *
	 * @var WooCommerce
	 */

	public $wc;

	/**
	 * Easy Digital Download Integration class instance.
	 *
	 * @var EDD
	 */

	public $edd;


	public static function instance() {
		if ( is_null( self::$_instance ) ) {
			self::$_instance = new self();
		}

		return self::$_instance;
	}


	public function __construct() {
		$this->define_tables();
		$this->includes();
		$this->init_hooks();

		add_action( 'admin_init', [ $this, 'flush_rewrite_rules' ] );
	}

	/**
	 * Register custom tables within $wpdb object.
	 */
	private function define_tables() {
		global $wpdb;

		// List of tables without prefixes.
		$tables = [
			'dozent_completes'             => 'dozent_completes',
			'dozent_instructor_courses'    => 'dozent_instructor_courses',
			'dozent_reviews'               => 'dozent_reviews',
			'dozent_enrols'                => 'dozent_enrols',
			'dozent_withdrawal'            => 'dozent_withdrawal',
			'dozent_earnings'              => 'dozent_earnings',
			'dozent_quiz_questions'        => 'dozent_quiz_questions',
			'dozent_quiz_question_options' => 'dozent_quiz_question_options',
			'dozent_quiz_attempts'         => 'dozent_quiz_attempts',
			'dozent_quiz_answers'          => 'dozent_quiz_answers',
		];

		foreach ( $tables as $name => $table ) {
			$wpdb->$name    = $wpdb->prefix . $table;
			$wpdb->tables[] = $table;
		}
	}

	public function includes() {
		include_once dirname( DOZENT_FILE ) . '/includes/define_constants.php';
		include_once DOZENT_ABSPATH . 'includes/core-functions.php';
		include_once DOZENT_ABSPATH . 'includes/form-functions.php';
		include_once DOZENT_ABSPATH . 'includes/conditional-functions.php';
		include_once DOZENT_ABSPATH . 'includes/template-functions.php';
		include_once DOZENT_ABSPATH . 'includes/user-functions.php';
		include_once DOZENT_ABSPATH . 'includes/course-functions.php';
		include_once DOZENT_ABSPATH . 'includes/quiz-functions.php';
		include_once DOZENT_ABSPATH . 'includes/earning-functions.php';
		include_once DOZENT_ABSPATH . 'includes/integration-functions.php';

		include_once DOZENT_ABSPATH . 'includes/template-hooks.php';
	}

	public function init_hooks() {
		add_action( 'init', [ $this, 'init' ], 0 );
		add_action( 'init', [ $this, 'register_hooks' ], 99 );

		register_activation_hook( DOZENT_FILE, [ $this, 'install' ] );
	}

	public function init() {
		$this->path     = DOZENT_ABSPATH;
		$this->url      = DOZENT_URL;
		$this->basename = DOZENT_BASENAME;


		do_action( 'dozent_init_before' );

		$this->load_plugin_textdomain();
		$this->flash_message_support();

		$this->core              = new Core();
		$this->admin             = new Admin();
		$this->post_type         = new PostType();
		$this->resources         = new Resources();
		$this->ajax              = new Ajax();
		$this->localize_script   = new LocalizeScript();
		$this->metabox           = new MetaBox();
		$this->course_builder    = new CourseBuilder();
		$this->course_curriculum = CourseCurriculum::instance();
		$this->template          = new Template();
		$this->permalinks        = new Permalinks();
		$this->lecture           = new Lecture();
		$this->discussion        = new Discussion();
		$this->dashboard         = new Dashboard();
		$this->shortcode         = new ShortCode();
		$this->user              = new User();
		$this->withdrawal        = new Withdrawal();
		$this->course_gate       = new CourseGate();
		$this->wishlist          = new Wishlist();
		$this->quiz              = new Quiz();

		//Factory
		$this->course_factory = new Course();

		//Integration
		$this->wc  = new WooCommerce();
		$this->edd = new EDD();

		do_action( 'dozent_init_after' );
	}

	/**
	 * Register hooks for DozentLMS
	 *
	 * @since DozentLMS 1.0.0
	 */

	public function register_hooks() {
		$dozent_action = dozent_input_text( 'dozent_action' );

		if ( $dozent_action ) {
			do_action( $dozent_action );
		}
	}

	public function load_plugin_textdomain() {
		load_plugin_textdomain( 'dozent', false, basename( dirname( DOZENT_FILE ) ) . '/languages' );
	}

	public function flash_message_support() {
		$cookie        = $_COOKIE;
		$flash_message = dozent_array_get( 'dozent_flash.message', $cookie );

		if ( ! empty( $flash_message ) ) {

			if ( is_admin() ) {
				add_action( 'admin_notices', [ $this, 'admin_show_flash_message' ] );
			}

			setcookie( 'dozent_flash[message]' );
			setcookie( 'dozent_flash[type]' );
			setcookie( 'dozent_flash[view_count]' );
		}
	}

	public function admin_show_flash_message() {
		dozent_flash_message();
	}

	public function install() {
		$version = get_option( 'dozent_version' );

		do_action( 'dozent_plugin_before_activate', $version );

		//Save Option
		if ( ! $version ) {
			//Install necessary things for the Dozent
			Install::instance();

			//Rewrite Flush
			update_option( 'required_rewrite_flush', dozent_time() );
		}

		do_action( 'dozent_plugin_after_activate', $version );


		//Updated the current Dozent Plugin version.
		update_option( 'dozent_version', DOZENT_VERSION );
	}


	/**
	 * Rewrite flush to server with new URL base
	 * Usage case: change courses, lectures, quiz, assignments and others permalink base
	 *
	 * @since DozentLMS 1.0.0
	 */

	public function flush_rewrite_rules() {
		$is_required_flush = get_option( 'required_rewrite_flush' );
		if ( $is_required_flush ) {
			delete_option( 'required_rewrite_flush' );

			flush_rewrite_rules();
		}
	}


}