class ShortCode{

	public static function instance() {
		static $instance = null;

		if ( null === $instance ) {
			$instance = new self();
		}

		return $instance;
	}

	public function __construct() {
		add_shortcode( 'dozent_user_signup', array( $this, 'user_signup' ) );

		add_shortcode( 'dozent_author_meta', array( $this, 'author_meta' ) );
		add_shortcode( 'dozent_course_title', array( $this, 'course_title' ) );
		add_shortcode( 'dozent_author_meta', array( $this, 'author_meta' ) );
		add_shortcode( 'dozent_course_excerpt', array( $this, 'course_excerpt' ) );
		add_shortcode( 'dozent_course_loop_level', array( $this, 'course_loop_level' ) );
		add_shortcode( 'dozent_course_total_lectures', array( $this, 'course_total_lectures' ) );
	}


	/**
	 * @return mixed|void
	 *
	 * Instructor signup page.
	 */
	public function user_signup(){
		ob_start();
		dozent_load_template( 'shortcode/user-signup' );

		return apply_filters( 'dozent/user_signup', ob_get_clean() );
	}

	/**
	 * @return mixed|void
	 *
	 * Return Course Title
	 */

	public function course_title(){
		ob_start();
		dozent_load_template( 'loop/course-title' );
		return apply_filters( 'dozent/shortcode/course-title', ob_get_clean() );
	}

	public function author_meta(){
		ob_start();
		dozent_load_template( 'single.course.author-meta' );
		return apply_filters( 'dozent/shortcode/author-meta', ob_get_clean() );
	}

	public function course_excerpt(){
		ob_start();
		dozent_load_template( 'loop/course-excerpt' );
		return apply_filters( 'dozent/shortcode/course-excerpt', ob_get_clean() );
	}

	public function course_loop_level(){
		ob_start();
		dozent_load_template( 'loop/course-level' );
		return apply_filters( 'dozent/shortcode/course-level', ob_get_clean() );
	}

	public function course_total_lectures(){
		ob_start();
		dozent_load_template( 'loop/total-lectures' );
		return apply_filters( 'dozent/shortcode/total-lectures', ob_get_clean() );
	}

}