<?php



class LP_Quiz_Factory {

	static $user = null;

	static $quiz = null;



	static function init() {

		$actions = array(

			'start-quiz'     => 'start_quiz',

			'finish-quiz'    => 'finish_quiz',

			'retake-quiz'    => 'retake_quiz',

			'check-question' => 'check_question'

		);

		foreach ( $actions as $k => $v ) {

			LP_Request_Handler::register_ajax( $k, array( __CLASS__, $v ) );

		}

		/*

		add_action( 'learn_press_before_user_start_quiz', array( __CLASS__, 'xxx' ), 5, 3 );

		add_action( 'init', array( __CLASS__, 'yyy' ) );

		add_action( 'init', array( __CLASS__, '_delete_anonymous_users' ) );*/

	}



	static function yyy() {

		$user = learn_press_get_current_user();

		if ( $user instanceof LP_User_Guest ) {

			$expire  = get_user_meta( $user->id, '_lp_anonymous_user_expire', true );

			$current = time();

			if ( ( $current - ( $expire - 60 ) ) < 10 ) {

				update_user_meta( $user->id, '_lp_anonymous_user_expire', $current + 60 );

			}

		}

	}



	static function _delete_anonymous_users() {

		global $wpdb;

		$sql = $wpdb->prepare( "

		DELETE a, b FROM $wpdb->users a, $wpdb->usermeta b

		WHERE a.ID = b.user_id

		AND b.meta_key = %s

		AND b.meta_value < %d

		", '_lp_anonymous_user_expire', time() );

		//$wpdb->query( $sql );

	}



	static function xxx( $start, $quiz_id, $user_id ) {

		$start  = false;

		$x      = 60;

		$expire = $x + time();

		$user   = get_user_by( 'id', $user_id );

		if ( $user ) {

			if ( $expire_time = get_user_meta( $user_id, '_lp_anonymous_user_expire', true ) ) {

				$current_time = time();

				if ( $expire_time - $current_time <= 0 ) {

					update_user_meta( $user_id, '_lp_anonymous_user_expire', $expire );

				}

			}

			return $start;

		}

		$new_user_id = wp_create_user( uniqid( 'user_' . time() ), '12345' );

		if ( $new_user_id ) {

			global $wpdb;

			if ( $wpdb->update( $wpdb->users, array( 'ID' => $user_id ), array( 'ID' => $new_user_id ) ) ) {

				update_user_meta( $user_id, '_lp_anonymous_user_expire', $expire );

			}

		}

		return $start;

	}



	static function start_quiz() {

		$quiz_id  = learn_press_get_request( 'quiz_id' );

		$response = array( 'result' => 'success' );

		$quiz     = LP_Quiz::get_quiz( $quiz_id );



		self::_verify_nonce();



		LP()->set_object( 'quiz', $quiz, true );

		$user = learn_press_get_current_user();



		if ( $quiz->is_require_enrollment() && $user->is( 'guest' ) ) {

			learn_press_send_json(

				array(

					'result'  => 'error',

					'message' => array( 'title' => __( 'Error', 'learnpress' ), 'message' => __( 'You need to login to do this quiz.', 'learnpress' ) )

				)

			);

		}



		if ( learn_press_get_request( 'preview' ) == 'true' ) {

			learn_press_send_json(

				array(

					'result'  => 'error',

					'message' => array( 'title' => __( 'Error', 'learnpress' ), 'message' => __( 'You can not start quiz in preview mode.', 'learnpress' ) )

				)

			);

		}

		if ( $quiz->is_require_enrollment() && $user->is( 'guest' ) ) {

			learn_press_send_json(

				array(

					'result'  => 'error',

					'message' => array( 'title' => __( 'Error', 'learnpress' ), 'message' => __( 'You need to login to do this quiz.', 'learnpress' ) )

				)

			);

		}

		$user->set_quiz( $quiz );

		switch ( strtolower( $user->get_quiz_status( $quiz_id ) ) ) {

			case 'completed':

				learn_press_send_json(

					array(

						'result'   => 'error',

						'message'  => array( 'title' => __( 'Error', 'learnpress' ), 'message' => __( 'You have completed this quiz', 'learnpress' ) ),

						'data'     => $user->get_quiz_result(),

						'redirect' => $quiz->permalink

					)

				);

				break;

			case 'started':

				learn_press_send_json(

					array(

						'result'   => 'error',

						'message'  => array( 'title' => __( 'Error', 'learnpress' ), 'message' => __( 'You have started this quiz', 'learnpress' ) ),

						'data'     => array(

							'status' => $user->get_quiz_status()

						),

						'redirect' => $quiz->permalink

					)

				);

				break;

			default:

				$result           = $user->start_quiz();

				$current_question = !empty( $result['current_question'] ) ? $result['current_question'] : $user->get_current_question_id( $quiz_id );

				$question         = LP_Question_Factory::get_question( $current_question );

				if ( $question ) {

					$quiz->current_question = $question;

					ob_start();

					$question->render();

					$content = ob_get_clean();

				} else {

					$content = '';

				}

				learn_press_send_json(

					array(

						'result'   => $result === false ? 'fail' : 'success',

						'message'  => $result === false ? array(

							'title'   => __( 'Error', 'learnpress' ),

							'message' => __( 'Start quiz failed', 'learnpress' )

						) : '',

						'data'     => $result,

						'question' =>

							array(

								'id'        => $current_question,

								'permalink' => learn_press_get_user_question_url( $quiz_id, $current_question ),

								'content'   => $content

							)

					)

				);

		}

		learn_press_send_json( $response );

	}



	static function finish_quiz() {

		$quiz_id = learn_press_get_request( 'quiz_id' );

		$quiz    = LP_Quiz::get_quiz( $quiz_id );

		$user    = learn_press_get_current_user();

		self::_verify_nonce();

		LP()->set_object( 'quiz', $quiz, true );



		if ( $user->get_quiz_status( $quiz->id ) != 'completed' ) {

			$user->finish_quiz( $quiz_id );

			$response = array(

				'redirect' => get_the_permalink( $quiz_id )

			);

			learn_press_send_json( $response );

		}

	}



	static function retake_quiz() {

		$quiz_id = learn_press_get_request( 'quiz_id' );

		$user    = learn_press_get_current_user();

		self::_verify_nonce();



		LP()->set_object( 'quiz', LP_Quiz::get_quiz( $quiz_id ), true );



		if ( $user->get_quiz_status( $quiz_id ) == 'completed' ) {

			$response = $user->retake_quiz( $quiz_id );

			learn_press_send_json( $response );

		}



		learn_press_send_json(

			array(

				'result'  => 'error',

				'message' => array(

					'title'   => __( 'Error', 'learnpress' ),

					'message' => __( 'You can not retake this quiz', 'learnpress' )

				)

			)

		);

	}



	static function check_question() {

		self::_verify_nonce();

		$user_id     = learn_press_get_request( 'user_id' );

		$quiz_id     = learn_press_get_request( 'quiz_id' );

		$question_id = learn_press_get_request( 'question_id' );

		$user        = learn_press_get_user( $user_id );

		$quiz        = LP_Quiz::get_quiz( $quiz_id );

		LP()->set_object( 'quiz', $quiz, true );



		$question_answer = LP_Question_Factory::save_question_if_needed( $question_id, $quiz_id, $user_id );

		if ( !$quiz || !$quiz->id ) {

			return;

		}

		if ( $quiz->show_check_answer != 'yes' ) {

			return;

		}

		if ( $quiz ) {

			$quiz->check_question( $question_id, $user );

		}

		if ( $question_id && $question = LP_Question_Factory::get_question( $question_id ) ) {

			$include = apply_filters( 'learn_press_check_question_answers_include_fields', null, $question_id, $quiz_id, $user_id );

			$exclude = apply_filters( 'learn_press_check_question_answers_exclude_fields', array( 'text' ), $question_id, $quiz_id, $user_id );

			$checked = $question->get_answers( $include, $exclude );

			if ( $checked ) {

				$checked = array_values( $checked );

			}

		} else {

			$checked = false;

		}

		$checked = apply_filters( 'learn_press_check_question_answers', $checked, $question_id, $quiz_id, $user_id );



		$response = array(

			'result'   => 'success',

			'checked'  => $checked,

			'answered' => $question_answer



		);

		learn_press_send_json( $response );

	}



	static function _verify_nonce() {

		$quiz_id  = learn_press_get_request( 'quiz_id' );

		$user_id  = learn_press_get_current_user_id();

		$security = learn_press_get_request( 'nonce' );

		$quiz     = LP_Quiz::get_quiz( $quiz_id );

		if ( !wp_verify_nonce( $security, 'learn-press-quiz-action-' . $quiz_id . '-' . $user_id ) || !$quiz->id ) {

			learn_press_send_json(

				array(

					'result'  => 'error',

					'message' => array( 'title' => __( 'Error', 'learnpress' ), 'message' => __( 'Please contact site\'s administrator for more information.', 'learnpress' ) )

				)

			);

		}

	}

}



LP_Quiz_Factory::init();