<?php

if ( class_exists( 'LP_Abstract_Question' ) ) {

	/**

	 * Class LP_Question_Sorting_Choice

	 *

	 * @extend LP_Question_Abstract

	 */

	class LP_Question_Fill_In_Blank extends LP_Abstract_Question {



		/**

		 * @var string

		 */

		protected $_shortcode_pattern = '!\[fib(.*)fill=["|\'](.*)["|\']!iSU';



		/**

		 * LP_Question_Fill_In_Blank constructor.

		 *

		 * @param null $the_question

		 * @param null $args

		 */

		function __construct( $the_question, $args ) {

			add_action( 'wp_enqueue_scripts', array( $this, 'load_assets' ) );

			add_shortcode( 'fib', array( $this, 'shortcode' ) );



			parent::__construct( $the_question, $args );

			$this->checked = $this->get_answers();

			add_action( 'learn_press_save_user_question_answer', array( $this, '_get_checked' ), 5, 5 );

			add_filter( 'learn_press_check_question_answers', array( $this, '_check_answer' ), 5, 4 );



			learn_press_add_question_type_support( $this->type, array( 'check-answer', 'hint' ) );

		}



		/**

		 * @param $question_answer

		 * @param $save_id

		 * @param $quiz_id

		 * @param $user_id

		 * @param $a

		 */

		function _get_checked( $question_answer, $save_id, $quiz_id, $user_id, $a ) {

			$this->user_answered = $question_answer;

		}



		/**

		 * @param $checked

		 * @param $question_id

		 * @param $quiz_id

		 * @param $user_id

		 *

		 * @return string

		 */

		function _check_answer( $checked, $question_id, $quiz_id, $user_id ) {

			//

			if( $question_id == $this->id) {

				settype( $checked, 'array' );

				$content = reset( $checked );

				$content = stripcslashes( current( $content ) );



				$pattern = $this->_shortcode_pattern;



				$content = preg_replace_callback( $pattern, array( $this, '_replace_callback' ), $content );



				$checked = '<div class="question-passage">' . do_shortcode( $content ) . '</div>';

			}

			return $checked;

		}



		/**

		 * @param $a

		 *

		 * @return string

		 */

		function _replace_callback( $a ) {

			$user_fill = '';



			if ( !empty( $this->user_answered ) ) {

				settype( $this->user_answered, 'array' );

				$input_name = $this->get_input_name( $a[2] );

				if ( !empty( $this->user_answered[$input_name] ) ) {

					settype( $this->user_answered[$input_name], 'array' );

					$user_fill = array_shift( $this->user_answered[$input_name] );

				}

			}



			return $a[0] . ' correct_fill="' . $a[2] . '" user_fill="' . $user_fill . '"';

		}



		/**

		 * @param $fill

		 *

		 * @return string

		 */

		function get_input_name( $fill ) {

			return '_' . md5( wp_create_nonce( $fill ) );

		}



		/**

		 * @param null $atts

		 *

		 * @return string

		 */

		function shortcode( $atts = null ) {

			$atts       = shortcode_atts(

				array(

					'fill'         => '',

					'user_fill'    => '',

					'correct_fill' => ''

				), $atts

			);

			$input_name = $this->get_input_name( $atts['fill'] );

			return sprintf(

				'<input type="text" name="%s" data-fill="%s" value="%s" %s />%s',

				'learn-press-question-' . $this->id . '[' . $input_name . '][]',

				esc_attr( $input_name ),

				$atts['user_fill'],

				$atts['correct_fill'] ? ' disabled="disabled"' : '',

				$atts['correct_fill'] ? sprintf( '<span class="check-label %s">%s</span>', $atts['user_fill'] == $atts['correct_fill'] ? 'correct' : 'wrong', $atts['correct_fill'] ) : ''

			);

		}



		/**

		 * Assets

		 */

		function load_assets() {

			wp_enqueue_style( 'fill-in-blank', plugins_url( 'assets/style.css', LP_QUESTION_FILL_IN_BLANK_FILE ) );

		}



		/**

		 * Magic __get helper

		 *

		 * @param $key

		 *

		 * @return mixed|null|string

		 */

		function __get( $key ) {

			if ( $key == 'passage' || $key == 'passage_checked' ) {

				$answers = (array) $this->get_answers();

				$passage = reset( $answers );

				$passage = !empty( $passage[0] ) ? stripcslashes( $passage[0] ) : null;

				if ( $key == 'passage_checked' ) {

					if ( $passage ) {



						$pattern = $this->_shortcode_pattern;

						$passage = preg_replace_callback( $pattern, array( $this, '_replace_callback' ), $passage );

					}

				}



				return $passage;

			}

			return parent::__get( $key );

		}



		/**

		 * Admin interface

		 *

		 * @param array $args

		 *

		 * @return string

		 */

		function admin_interface( $args = array() ) {

			ob_start();



			$view = learn_press_get_admin_view( 'admin-fill-in-blank-options', LP_QUESTION_FILL_IN_BLANK_FILE );

			include $view;

			$output = ob_get_clean();



			if ( !isset( $args['echo'] ) || ( isset( $args['echo'] ) && $args['echo'] === true ) ) {

				echo $output;

			}

			return $output;

		}



		/**

		 * Question content

		 *

		 * @param null $args

		 */

		function render( $args = null ) {



			settype( $args, 'array' );

			$answered = !empty( $args['answered'] ) ? $args['answered'] : array();



			$view = LP_Addon_Question_Fill_In_Blank::locate_template( 'fill-in-blank.php' );

			include $view;



		}



		/**

		 * Check result of question

		 *

		 * @param null $args

		 *

		 * @return mixed

		 */

		function check( $args = null ) {

			$key           = wp_create_nonce( maybe_serialize( $args ) );

			$check_results = $this->check_results;

			if ( empty( $check_results ) ) {

				$check_results = array();

			}

			if ( empty( $check_results[$key] ) ) {



				$return = array(

					'correct' => true

				);



				$passage = $this->passage;

				if ( preg_match_all( $this->_shortcode_pattern, $passage, $matches ) ) {

					settype( $args, 'array' );

					$input_pos = array();

					foreach ( $matches[0] as $k => $v ) {

						$input_name = $this->get_input_name( $matches[2][$k] );

						$user_fill  = '';

						if ( !empty( $args[$input_name] ) ) {

							$pos = !empty( $input_pos[$input_name] ) ? $input_pos[$input_name] : 1;

							if ( !empty( $args[$input_name][$pos - 1] ) ) {

								$user_fill = $args[$input_name][$pos - 1];

							}

							$input_pos[$input_name] = $pos + 1;

						}

						if ( $user_fill != $matches[2][$k] ) {

							$return['correct'] = false;

						}

					}

					$return['mark'] = $return['correct'] ? $this->mark : 0;

				}

				$check_results[$key] = $return;

				$this->check_results = $check_results;

			}

			return $check_results[$key];

		}



		/**

		 * @param null $post_data

		 */

		function save( $post_data = null ) {



			global $wpdb;

			$wpdb->delete( $wpdb->prefix . 'learnpress_question_answers', array( 'question_id' => $this->id ), array( '%d' ) );

			$wpdb->insert(

				$wpdb->prefix . 'learnpress_question_answers',

				array(

					'question_id'  => $this->id,

					'answer_data'  => maybe_serialize( $post_data ),

					'answer_order' => 1

				),

				array( '%d', '%s', '%d' )

			);



		}

	}

}