/**
* Change the correct answer after the question has been locked. Update user marks in summative log table
* @param mixed $new_correct Array of new values for fields that can be corrected
* @param integer $paper_id
* @param boolean $changes True if changes have been made by a previous corrector
* @param integer $paper_type Integer index for type of paper
* @return array[$string] Any errors encountered in the correction process
*/
public function execute($new_correct, $paper_id, &$changes, $paper_type)
{
$errors = array();
$marks_correct = $this->_question->get_marks_correct();
$marks_incorrect = $this->_question->get_marks_incorrect();
$marks_partial = $this->_question->get_marks_partial();
$tolerance_full = $this->_question->get_tolerance_full();
if ($tolerance_full != $new_correct['tolerance_full']) {
$this->_question->set_tolerance_full($new_correct['tolerance_full']);
$changes = true;
$this->_question->add_unified_field_modification('tolerance_full', 'tolerance_full', $tolerance_full, $new_correct['tolerance_full'], $this->_lang_strings['postexamchange']);
}
$tolerance_partial = $this->_question->get_tolerance_partial();
if ($tolerance_partial != $new_correct['tolerance_partial']) {
$this->_question->set_tolerance_partial($new_correct['tolerance_partial']);
$changes = true;
$this->_question->add_unified_field_modification('tolerance_partial', 'tolerance_partial', $tolerance_partial, $new_correct['tolerance_partial'], $this->_lang_strings['postexamchange']);
}
$answer_precision = $this->_question->get_answer_precision();
if ($answer_precision != $new_correct['answer_precision']) {
$this->_question->set_answer_precision($new_correct['answer_precision']);
$changes = true;
$this->_question->add_unified_field_modification('answer_precision', 'answer_precision', $answer_precision, $new_correct['answer_precision'], $this->_lang_strings['postexamchange']);
}
$strict_zeros = $this->_question->get_strict_zeros();
// Need to be careful of how the correction code builds the values for check boxes
if (isset($new_correct['strict_zeros'])) {
$new_strict_zeros = is_array($new_correct['strict_zeros']) ? $new_correct['strict_zeros'][0] : $new_correct['strict_display'];
} else {
$new_strict_zeros = false;
}
if ($strict_zeros != $new_strict_zeros) {
$this->_question->set_strict_zeros($new_strict_zeros);
$changes = true;
$this->_question->add_unified_field_modification('strict_zeros', 'strict_zeros', $strict_zeros, $new_strict_zeros, $this->_lang_strings['postexamchange']);
}
// Parse answers
$opts = $this->_question->options;
for ($i = 1; $i <= $this->_question->max_options; $i++) {
if (isset($opts[$i])) {
$ans = $opts[$i]->get_formula();
$units = $opts[$i]->get_units();
if ($ans != '' and $new_correct['option_formula'][$i - 1] == '') {
$opts[$i]->set_formula('');
$opts[$i]->set_units('');
$changes = true;
$this->_question->add_unified_field_modification('Deleted Answer ' . $i, 'Deleted Answer ' . $i, $ans . ', ' . $units, '', $this->_lang_strings['postexamchange']);
} else {
if ($ans != $new_correct['option_formula'][$i - 1]) {
$opts[$i]->set_formula($new_correct['option_formula'][$i - 1]);
$changes = true;
if ($ans != '') {
$this->_question->add_unified_field_modification('option_formula' . $i, 'option_formula' . $i, $ans, $new_correct['option_formula'][$i - 1], $this->_lang_strings['postexamchange']);
}
}
if ($units != $new_correct['option_units'][$i - 1]) {
$opts[$i]->set_units($new_correct['option_units'][$i - 1]);
$changes = true;
if ($ans != '') {
$this->_question->add_unified_field_modification('option_units' . $i, 'option_units' . $i, $units, $new_correct['option_units'][$i - 1], $this->_lang_strings['postexamchange']);
}
}
if ($ans == '') {
$this->_question->add_unified_field_modification('New Answer ' . $i, 'New Answer ' . $i, '', $new_correct['option_formula'][$i - 1] . ', ' . $new_correct['option_units'][$i - 1], $this->_lang_strings['postexamchange']);
}
}
} elseif ($new_correct['option_formula'][$i - 1] != '') {
// Complete new answer
$changes = true;
$userObj = UserObject::get_instance();
$this->_question->options[$i] = new OptionENHANCEDCALC($this->_mysqli, $userObj->get_user_ID(), $this->_question, $i, $this->_lang_strings, array('formula' => $new_correct['option_formula'][$i - 1], 'units' => $new_correct['option_units'][$i - 1]));
$this->_question->add_unified_field_modification('New Answer ' . $i, 'New Answer ' . $i, '', $new_correct['option_formula'][$i - 1] . ', ' . $new_correct['option_units'][$i - 1], $this->_lang_strings['postexamchange']);
}
}
if ($changes) {
try {
if (!$this->_question->save()) {
$errors[] = $this->_lang_strings['datasaveerror'];
} else {
enhancedcalc_remark($paper_type, $paper_id, $this->_question->id, $this->_question->get_settings(), $this->_mysqli, 'all');
}
} catch (ValidationException $vex) {
$errors[] = $vex->getMessage();
}
if (count($errors) == 0) {
$this->invalidate_paper_cache($paper_id);
}
}
return $errors;
}
}
$check_possible->close();
}
$server_connection = true;
$statuses = array();
// Should not get here but if we do throw a critical error.
if (count($q_ids) == 0) {
// Critical error
$error = true;
$errline = __LINE__ - 3;
$return_status = $string['noenhancedcalcdetected'];
} else {
$return_status = 'Complete';
}
foreach ($q_ids as $q_id => $setting) {
$data = enhancedcalc_remark($paper_type, $paperID, $q_id, $setting, $mysqli, 'all');
if ($data[-3] > 0) {
$server_connection = false;
}
$statuses[$q_id] = $data;
}
$problem_questions = array();
foreach ($statuses as $qid => $data) {
if ($data[Q_MARKING_UNMARKED] > 0 or $data[Q_MARKING_ERROR] > 0) {
// Record unmarked and marking error problems.
$q_no = get_question_no($qid, $questions);
// Use the is if we cannot find the number.
// Most likely a random block / keyword based question.
if ($q_no == '') {
$q_no = 'qid: ' . $qid;
}