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Editing: class-lp-user-item-quiz.php

<?php

/**
 * Class LP_User_Item_Quiz
 */
class LP_User_Item_Quiz extends LP_User_Item {
	public $_item_type = LP_QUIZ_CPT;
	public $_ref_type  = LP_COURSE_CPT;
	/**
	 * @var array
	 */
	protected $_answers = array();

/**
	 * LP_User_Item_Quiz constructor.
	 *
	 * @param array $data
	 */
	public function __construct( $data ) {
		$this->_curd = new LP_Quiz_CURD();

parent::__construct( $data );
		$this->_parse_answers();
	}

/**
	 *
	 */
	protected function _parse_answers() {
		foreach ( array( '_question_answers', 'question_answers' ) as $k ) {
			$answers = learn_press_get_user_item_meta( $this->get_user_item_id(), $k, true );

if ( $answers ) {
				$this->_answers = $answers;
				break;
			}
		}
	}

/**
	 * Add user answer to DB.
	 *
	 * @param int|array $id
	 * @param mixed $values
	 *
	 * @return array|bool|LP_Quiz_Results|mixed
	 * @throws Exception
	 * @editor tungnx
	 * @modify 4.1.4.1 - comment - not use
	 */
	/*
	public function add_question_answer( $id, $values = null ) {
		$results = $this->get_results( '' );

if ( ! $results ) {
			return false;
		}

$questions = $results->get( 'questions', array() );

if ( is_numeric( $id ) ) {
			$values = array( $id => $values );
		} else {
			$values = (array) $id;
		}

foreach ( $values as $id => $answer ) {
			if ( ! $this->has_checked_question( $id ) ) {
				if ( ! empty( $questions[ $id ] ) ) {
					$questions[ $id ]['answered'] = $answer;
				} else {
					$questions[ $id ] = array( 'answered' => $answer );
				}
			}
		}

$results['questions'] = $questions;

//LP_User_Items_Result_DB::instance()->update( $this->get_user_item_id(), wp_json_encode( $results->get() ) );

$this->calculate_results();

$cache_key = sprintf( 'quiz-%d-%d-%d', $this->get_user_id(), $this->get_course_id(), $this->get_item_id() );

LP_Object_Cache::set( $cache_key, false, 'learn-press/quiz-result' );

return $this->get_results( '' );
	}*/

public function get_question_answer( $id ) {
		$results = $this->get_results( '' );

if ( ! $results ) {
			return false;
		}

$questions = $results->get( 'questions', false );

if ( $questions && is_array( $questions[ $id ] ) ) {
			return $questions[ $id ]['answered'];
		}

return false;
	}

/**
	 * Update data to database
	 *
	 * @param bool $force
	 * @param bool $wp_error
	 *
	 * @return bool|mixed
	 */
	/*
	public function update( $force = false, $wp_error = false ) {
		$return = parent::update( $force, $wp_error );
		$this->calculate_results();

return $return;
	}*/

/**
	 * Get list of data to update to database
	 *
	 * @since 3.1.0
	 *
	 * @return array
	 */
	public function get_mysql_data() {
		$columns = parent::get_mysql_data();

return apply_filters( 'learn-press/update-user-item-quiz-data', $columns, $this->get_item_id(), $this->get_course_id(), $this->get_user_id() );
	}

/**
	 * @return bool|LP_Quiz
	 */
	public function get_quiz() {
		return learn_press_get_quiz( $this->get_item_id() );
	}

public function get_status_label( $status = '' ) {
		$statuses = array(
			'started'     => __( 'In Progress', 'learnpress' ),
			'in-progress' => __( 'In Progress', 'learnpress' ),
			'completed'   => __( 'Completed', 'learnpress' ),
			'passed'      => __( 'Passed', 'learnpress' ),
			'failed'      => __( 'Failed', 'learnpress' ),
		);

if ( ! $status ) {
			$status = $this->get_status();
		}

return ! empty( $statuses[ $status ] ) ? $statuses[ $status ] : __( 'Not Started', 'learnpress' );
	}

/**
	 * Get ID of the course that this item assigned to.
	 *
	 * @return array|mixed
	 */
	public function get_course_id() {
		return $this->get_data( 'ref_id' );
	}

/**
	 * Get result
	 *
	 * @param string $prop
	 *
	 * @return array|bool|mixed
	 */
	public function get_result( $prop = '' ) {
		$result = $this->calculate_quiz_result();

// Fix temporary for case call 'grade' - addons called
		if ( 'grade' === $prop ) {
			if ( $result['pass'] ) {
				$result['grade'] = 'passed';
			} else {
				$result['grade'] = 'failed';
			}
		}

return $prop && $result && array_key_exists( $prop, $result ) ? $result[ $prop ] : $result;
	}

/**
	 * Calculate result of quiz.
	 *
	 * @param string $prop
	 * @param bool   $force - Optional. Force to refresh cache.
	 *
	 * Clear cache on
	 * @see LP_REST_Users_Controller::start_quiz() | retake quiz
	 *
	 * @return LP_Quiz_Results|bool|mixed
	 * @throws Exception
	 * @editor tungnx
	 * @modify 4.1.3
	 * @version 4.0.1
	 */
	public function get_results( string $prop = 'result', bool $force = false ) {
		if ( ! $this->get_status() ) {
			return false;
		}

$lp_quiz_cache = LP_Quiz_Cache::instance();

$key_cache = sprintf( '%d/user/%d/course/%d', $this->get_item_id(), $this->get_user_id(), $this->get_course_id() );
		$result    = $lp_quiz_cache->get_cache( $key_cache );

if ( false === $result || $force ) {
			// $result = $this->_get_results();

// if ( false === $result ) {
			$result = $this->calculate_results();
			// }

$lp_quiz_cache->set_cache( $key_cache, $result );
		}

$result['user_item_id']   = $this->get_user_item_id();
		$result['interval']       = array( $this->get_start_time(), $this->get_end_time() );
		$result['graduation']     = $this->get_graduation();
		$result['graduationText'] = $this->get_graduation_text();

return $prop ? $result[ $prop ] : new LP_Quiz_Results( $result );
	}

/**
	 * Get user quiz graduation text for displaying purpose. [Passed, Failed, null]
	 *
	 * @since 4.0.0
	 *
	 * @return mixed
	 */
	public function get_graduation_text() {
		$graduation = $this->get_graduation();

return apply_filters( 'learn-press/user-quiz-graduation-text', learn_press_get_graduation_text( $graduation ) );
	}

/**
	 * Get Timestamp remaining when user doing quiz
	 *
	 * @author tungnx
	 * @version 1.0.1
	 * @sicne 4.1.4.1
	 * @return int
	 */
	public function get_timestamp_remaining(): int {
		$timestamp_remaining = - 1;
		$quiz                = false;
		$user_quiz           = false;

try {
			$quiz = learn_press_get_quiz( $this->get_item_id() );
			if ( ! $quiz || LP_ITEM_STARTED != $this->get_status() ) {
				return $timestamp_remaining;
			}

$parent_id = $this->get_parent_id();
			$duration  = $quiz->get_duration()->get() . ' second';

$filter              = new LP_User_Items_Filter();
			$filter->parent_id   = $parent_id;
			$filter->item_id     = $this->get_item_id();
			$filter->user_id     = get_current_user_id();
			$user_quiz           = LP_User_Items_DB::getInstance()->get_user_course_item( $filter, true );
			$course_start_time   = $user_quiz->start_time;
			$timestamp_expire    = strtotime( $course_start_time . ' +' . $duration );
			$timestamp_current   = time();
			$timestamp_remaining = $timestamp_expire - $timestamp_current;

if ( $timestamp_remaining < 0 ) {
				$timestamp_remaining = 0;
			}
		} catch ( Throwable $e ) {

}

return apply_filters( 'learn-press/user-course-quiz/timestamp_remaining', $timestamp_remaining, $user_quiz, $quiz );
	}

/**
	 * Get all attempts of a quiz.
	 *
	 * @param string $args
	 *
	 * @return array
	 */
	public function get_attempts( $limit = 3 ) {
		$limit = $limit ?? 3;

$limit = absint( apply_filters( 'lp/quiz/get-attempts/limit', $limit ) );

$results = LP_User_Items_Result_DB::instance()->get_results( $this->get_user_item_id(), $limit, true );
		$output  = array();

if ( ! empty( $results ) ) {
			foreach ( $results as $result ) {
				if ( $result && is_string( $result ) ) {
					$result = json_decode( $result );

unset( $result->questions );

$output[] = $result;
				}
			}
		}

return $output;
	}

/**
	 * Get question ids user has started inside quiz.
	 *
	 * @since 4.0.0
	 *
	 * @return bool|array
	 */
	public function get_questions() {
		$quiz = learn_press_get_quiz( $this->get_item_id() );
		$ids  = $quiz->get_question_ids();

return apply_filters( 'learn-press/user-item-quiz-questions', $ids, $this->get_user_id(), $this );
	}

/**
	 * Calculate results of quiz.
	 *
	 * @return array
	 * @throws Exception
	 * @version 4.0.0
	 */
	public function calculate_results(): array {
		$quiz         = learn_press_get_quiz( $this->get_item_id() );
		$last_results = LP_User_Items_Result_DB::instance()->get_result( $this->get_user_item_id() );

if ( ! $last_results ) {
			$last_results = array();
		}

$questions = $last_results['questions'] ?? array_fill_keys( $quiz->get_question_ids(), array() );

$result = array(
			'questions'         => array(),
			'mark'              => $quiz->get_mark(),
			'user_mark'         => 0,
			'question_count'    => 0,
			'question_empty'    => 0,
			'question_answered' => 0,
			'question_wrong'    => 0,
			'question_correct'  => 0,
			'status'            => $this->get_status(),
			'result'            => 0,
			'time_spend'        => $this->get_time_interval( 'display' ),
			'passing_grade'     => $quiz->get_passing_grade(),
		);

if ( $questions ) {
			foreach ( $questions as $question_id => $last_checked ) {
				$question = LP_Question::get_question( $question_id );
				if ( ! $question ) {
					continue;
				}

$answered          = array_key_exists( 'answered', $last_checked ) ? $last_checked['answered'] : '';
				$check             = apply_filters( 'learn-press/quiz/check-question-result', $question->check( $answered ), $question_id, $this );
				$check['answered'] = $answered;

if ( $check['answered'] && $check['correct'] ) {
					$result['question_correct'] ++;
					$result['user_mark'] += array_key_exists( 'mark', $check ) ? floatval( $check['mark'] ) : $question->get_mark();
				} else {
					$negative_marking = apply_filters( 'learn-press/get-negative-marking-value', floatval( $question->get_mark() ), $question_id, $quiz->get_id() );

// If answered is empty consider user has skipped question
					if ( ! $check['answered'] ) {
						if ( $quiz->get_negative_marking() && $quiz->get_minus_skip_questions() ) {
							$result['user_mark'] -= $negative_marking;
						}
						$result['question_empty'] ++;
					} else {
						if ( $quiz->get_negative_marking() ) {
							$result['user_mark'] -= $negative_marking;
						}
						$result['question_wrong'] ++;
					}
				}

$result['questions'][ $question_id ] = apply_filters( 'learn-press/question-results-data', $last_checked ? array_merge( $last_checked, $check ) : $check, $question_id, $quiz->get_id() );

if ( $check['answered'] ) {
					$result['question_answered'] ++;
				}
			}

$result['user_mark'] = ( $result['user_mark'] >= 0 ) ? $result['user_mark'] : 0;

$percent          = $result['mark'] ? ( $result['user_mark'] / $result['mark'] ) * 100 : 0;
			$result['result'] = $percent;
			$grade            = '';

if ( $this->get_status() === 'completed' ) {
				$grade = $percent >= $this->get_quiz()->get_data( 'passing_grade' ) ? 'passed' : 'failed';
				$this->_set_data( 'graduation', $grade );
			}

$result['question_count'] = count( $questions );

if ( $grade ) {
				learn_press_update_user_item_field(
					array(
						'graduation' => $grade,
					),
					array(
						'user_item_id' => $this->get_user_item_id(),
					)
				);
			}
		}

return $result;
	}

/**
	 * Calculate result of quiz.
	 *
	 * @param array $answered [question_id => answered, 'instant_check' => 0]
	 *
	 * @return array
	 * @version 1.0.1
	 * @author tungnx
	 * @since 4.1.4.1
	 */
	public function calculate_quiz_result( array $answered = array() ): array {
		$result = array(
			'questions'         => array(),
			'mark'              => 0,
			'user_mark'         => 0,
			'minus_point'       => 0,
			'question_count'    => 0,
			'question_empty'    => 0,
			'question_answered' => 0,
			'question_wrong'    => 0,
			'question_correct'  => 0,
			'status'            => '',
			'result'            => 0,
			'time_spend'        => '',
			'passing_grade'     => '',
			'pass'              => 0,
		);

try {
			if ( LP_ITEM_COMPLETED === $this->get_status() ) {
				$result_tmp = LP_User_Items_Result_DB::instance()->get_result( $this->get_user_item_id() );

if ( $result_tmp ) {
					if ( isset( $result_tmp['user_mark'] ) && $result_tmp['user_mark'] < 0 ) {
						$result_tmp['user_mark'] = 0;
					}

$result = $result_tmp;
				}

return $result;
			}

$quiz = learn_press_get_quiz( $this->get_item_id() );

if ( ! $quiz ) {
				throw new Exception();
			}

$question_ids             = $quiz->get_question_ids();
			$result['mark']           = $quiz->get_mark();
			$result['question_count'] = $quiz->count_questions();
			$result['time_spend']     = $this->get_time_interval( 'display' );
			$result['passing_grade']  = $quiz->get_passing_grade();
			$checked_questions        = $this->get_checked_questions();

foreach ( $question_ids as $question_id ) {
				$question = LP_Question::get_question( $question_id );
				$point    = floatval( $question->get_mark() );

$result['questions'][ $question_id ]             = array();
				$result['questions'][ $question_id ]['answered'] = $answered[ $question_id ] ?? '';

if ( isset( $answered[ $question_id ] ) ) { // User's answer
					$result['question_answered']++;

$check = $question->check( $answered[ $question_id ] );
					$point = apply_filters( 'learn-press/user/calculate-quiz-result/point', $point, $question, $check );
					if ( $check['correct'] ) {
						$result['question_correct']++;
						$result['user_mark'] += $point;

$result['questions'][ $question_id ]['correct'] = true;
						$result['questions'][ $question_id ]['mark']    = $point;
					} else {
						if ( $quiz->get_negative_marking() ) {
							$result['user_mark']   -= $point;
							$result['minus_point'] += $point;
						}
						$result['question_wrong']++;

$result['questions'][ $question_id ]['correct'] = false;
						$result['questions'][ $question_id ]['mark']    = 0;
					}
				} elseif ( ! array_key_exists( 'instant_check', $answered ) ) { // User skip question
					if ( $quiz->get_minus_skip_questions() ) {
						$result['user_mark']   -= $point;
						$result['minus_point'] += $point;
					}
					$result['question_empty']++;

$result['questions'][ $question_id ]['correct'] = false;
					$result['questions'][ $question_id ]['mark']    = 0;
				}

$can_review_quiz = get_post_meta( $quiz->get_id(), '_lp_review', true ) === 'yes';
				if ( $can_review_quiz && ! array_key_exists( 'instant_check', $answered ) ) {

$result['questions'][ $question_id ]['explanation'] = $question->get_explanation();
					$result['questions'][ $question_id ]['options']     = learn_press_get_question_options_for_js(
						$question,
						array(
							'include_is_true' => in_array( $question_id, $checked_questions ) || get_post_meta( $quiz->get_id(), '_lp_show_correct_review', true ) === 'yes',
							'answer'          => $answered[ $question_id ] ?? '',
						)
					);
				}
			}

if ( $result['user_mark'] < 0 ) {
				$result['user_mark'] = 0;
			}

if ( $result['user_mark'] > 0 && $result['mark'] > 0 ) {
				$result['result'] = round( $result['user_mark'] * 100 / $result['mark'], 2, PHP_ROUND_HALF_DOWN );
			}

$passing_grade = $quiz->get_data( 'passing_grade', 0 );
			if ( $result['result'] >= $passing_grade ) {
				$result['pass'] = 1;
			} else {
				$result['pass'] = 0;
			}
		} catch ( Throwable $e ) {

}

return $result;
	}

public function get_option_answer() {

}

protected function _get_results() {
		return LP_User_Items_Result_DB::instance()->get_result( $this->get_user_item_id() );
	}

public function get_percent_result( $decimal = 2 ) {
		return apply_filters( 'learn-press/user/quiz-percent-result', sprintf( '%s%%', round( $this->get_result( 'result' ), $decimal ), $this->get_user_id(), $this->get_item_id() ) );
	}

public function get_time_interval( $context = '' ) {
		$interval = parent::get_time_interval();

if ( $context == 'display' ) {
			$quiz = $this->get_quiz();

if ( $quiz && $interval && $quiz->get_duration() ) {
				$interval = new LP_Duration( $interval );
				$interval = $interval->to_timer();
			} else {
				$interval = '--:--';
			}
		}

return $interval;
	}

/**
	 * Return TRUE if user has pressed SKIP on this question
	 *
	 * @param int $question_id
	 *
	 * @return bool
	 */
	public function is_skipped( $question_id ) {
		return $this->get_question_answer( $question_id ) === '__SKIPPED__';
	}

public function is_answered( $question_id ) {
		$result = $this->get_results();

if ( ! empty( $result['questions'][ $question_id ] ) ) {
			return $result['questions'][ $question_id ]['answered'];
		}

return false;
	}

public function is_answered_true( $question_id ) {
		$result = $this->get_results( false );

if ( ! empty( $result['questions'][ $question_id ] ) ) {
			return $result['questions'][ $question_id ]['correct'];
		}

return false;
	}

/**
	 * Get questions user has answered.
	 *
	 * @param bool $percent - Optional. TRUE will return by percentage with total questions.
	 *
	 * @return float|int|mixed
	 */
	public function get_questions_answered( $percent = false ) {
		$result = $this->get_results( '' );

if ( $percent ) {
			if ( $result['question_count'] ) {
				$return = 0;
			} else {
				$return = $result['question_answered'] ? ( $result['question_answered'] / $result['question_count'] ) * 100 : 0;
			}
		} else {
			$return = $result['question_answered'];
		}

return $return;
	}

/**
	 * Get total mark user achieved.
	 *
	 * @param bool $percent - Optional. TRUE will return by percentage with total mark.
	 *
	 * @return float|int|mixed
	 */
	public function get_mark( $percent = false ) {
		$result = $this->get_results();

if ( $percent ) {
			$return = $result['mark'] ? ( $result['user_mark'] / $result['mark'] ) * 100 : 0;
		} else {
			$return = $result['user_mark'];
		}

return $return;
	}

/**
	 * @deprecated 4.2.0
	 */
	public function get_total_questions() {
		_deprecated_function( __METHOD__, '4.2.0' );
		$quiz      = learn_press_get_quiz( $this->get_item_id() );
		$questions = $quiz->get_question_ids();

return sizeof( $questions );
	}

public function get_quiz_mark() {
		$result = $this->get_results();

return $result['mark'];
	}

/**
	 * Return time remaining.
	 *
	 * @param string $return - Optional.
	 *
	 * @return LP_Duration
	 * @deprecated 4.1.7.3
	 */
	public function get_time_remaining( $return = 'object' ) {
		_deprecated_function( __METHOD__, '4.1.7.3' );
		/*$time = parent::get_time_remaining( $return );

return apply_filters( 'learn-press/quiz/time-remaining', $time, $this->get_item_id(), $this->get_course_id(), $this->get_user_id() );*/
	}

/**
	 * Get all questions user has already used "Check"
	 *
	 * @return array
	 */
	public function get_checked_questions(): array {
		$value = $this->get_meta( '_lp_question_checked', true );

if ( $value ) {
			$value = (array) $value;
		} else {
			$value = array();
		}

return $value;
	}

public function add_checked_question( $id ) {
		settype( $id, 'array' );
		$checked = $this->get_checked_questions();
		$checked = array_merge( $checked, $id );

$this->update_meta( '_lp_question_checked', $checked );

return $checked;
	}

/**
	 * Return true if user has already checked a question.
	 *
	 * @param int $question_id
	 *
	 * @return bool
	 */
	public function has_checked_question( $question_id ) {
		return in_array( $question_id, $this->get_checked_questions() );
	}

/**
	 * Instant check question
	 *
	 * @param int   $question_id
	 * @param mixed $answered
	 *
	 * @return array
	 * @throws Exception
	 */
	public function instant_check_question( int $question_id, $answered = null ): array {
		$question = learn_press_get_question( $question_id );
		if ( ! $question ) {
			throw new Exception( __( 'The question is invalid!', 'learnpress' ) );
		}

$can_check = $this->can_check_answer( $question_id );
		if ( ! $can_check ) {
			throw new Exception( __( 'Cannot check the answer to the question.', 'learnpress' ) );
		}

$answered_check = array(
			'instant_check' => 1,
			$question_id    => $answered,
		);

// For case save result when check instant answer
		$result_instant_check = LP_User_Items_Result_DB::instance()->get_result( $this->get_user_item_id() );
		if ( $result_instant_check ) {
			foreach ( $result_instant_check['questions'] as $question_answer_id => $question_answer ) {
				if ( ! empty( $question_answer['answered'] ) ) {
					$answered_check[ $question_answer_id ] = $question_answer['answered'];
				}
			}
		}

$result_answer = $this->calculate_quiz_result( $answered_check );

LP_User_Items_Result_DB::instance()->update( $this->get_user_item_id(), json_encode( $result_answer ) );
		$this->add_checked_question( $question_id );

$checked['answered'] = $answered;
		$checked['mark']     = $result_answer['questions'][ $question_id ]['mark'];
		$checked['correct']  = $result_answer['questions'][ $question_id ]['correct'];

return $checked;
	}

/**
	 * @param int $question_id
	 *
	 * @return int
	 * @deprecated 4.2.5
	 */
	public function hint( $question_id ) {
		_deprecated_function( __METHOD__, '4.2.5' );
		return false;
		$remain = $this->can_hint_answer();

if ( $remain ) {
			if ( ! $this->has_hinted_question( $question_id ) ) {
				$checked   = $this->get_hint_questions();
				$checked[] = $question_id;
				$this->set_meta( '_lp_question_hint', $checked );
			}

$count = $this->get_count_hint();
			$this->update_meta();
			$remain --;
		} else {
			return false;
		}

return $remain;
	}

/**
	 * Return true if user has already checked a question.
	 *
	 * @param int $question_id
	 *
	 * @return bool
	 */
	public function has_hinted_question( $question_id ) {
		return in_array( $question_id, $this->get_hint_questions() );
	}

public function get_check_answer_count() {
		return count( $this->get_checked_questions() );
	}

/**
	 * @param int $question_id - Added since 3.3.0
	 *
	 * @return bool
	 */
	public function can_check_answer( int $question_id = 0 ) : bool {
		$can  = false;
		$quiz = learn_press_get_quiz( $this->get_item_id() );

if ( ! $quiz ) {
			return $can;
		}

if ( $quiz->get_instant_check() && $this->get_status() === 'started' ) {
			$can = ! $this->has_checked_question( $question_id );
		}

return apply_filters( 'learn-press/can-instant-check-question', $can, $question_id, $this->get_item_id(), $this->get_course_id() );
	}

/**
	 * Get number retaken count.
	 *
	 * @return integer
	 */
	public function get_retaken_count(): int {
		return absint( learn_press_get_user_item_meta( $this->get_user_item_id(), '_lp_retaken_count' ) );
	}

/**
	 * Update learnpress_user_itemmeta retaken
	 *
	 * @return void
	 */
	public function update_retake_count() {
		$count = $this->get_retaken_count();
		$count ++;

return $this->update_meta( '_lp_retaken_count', $count );
	}

/**
	 * Get all questions user has already used "Check"
	 *
	 * @return array
	 * @deprecated 4.2.5
	 */
	public function get_hint_questions() {
		return [];
		_deprecated_function( __METHOD__, '4.2.5' );
		$value = $this->get_meta( '_lp_question_hint', true );

if ( $value ) {
			$value = (array) $value;
		} else {
			$value = array();
		}

return $value;
	}

/**
	 * @deprecated 4.2.5
	 */
	public function get_count_hint() {
		_deprecated_function( __METHOD__, '4.2.5' );
		return 0;
		return count( $this->get_hint_questions() );
	}

/**
	 * Return true if check answer is enabled.
	 *
	 * @return bool
	 */
	public function can_hint_answer() {
		return apply_filters( 'learn-press/user-quiz/can-hint-answer', true, $this->get_id(), $this->get_course_id() );
	}

/**
	 * @return bool
	 */
	public function is_review_questions(): bool {
		return LP_Global::quiz_question() && ( $this->get_status() === 'completed' );
	}
}