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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Upgrade library code for the numerical question type.
 *
 * @package    qtype
 * @subpackage numerical
 * @copyright  2010 The Open University
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

defined('MOODLE_INTERNAL') || die();

/**
 * Class for converting attempt data for numerical questions when upgrading
 * attempts to the new question engine.
 *
 * This class is used by the code in question/engine/upgrade/upgradelib.php.
 *
 * TODO update for the changes in Moodle 2.0.
 *
 * @copyright  2010 The Open University
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class qtype_numerical_qe2_attempt_updater extends question_qtype_attempt_updater {
    public function right_answer() {
        foreach ($this->question->options->answers as $ans) {
            if ($ans->fraction > 0.999) {
                $right = $ans->answer;

if (empty($this->question->options->units)) {
                    return $right;
                }

$unit = reset($this->question->options->units);
                $unit = $unit->unit;
                if (!empty($this->question->options->unitsleft)) {
                    return $unit . ' ' . $right;
                } else {
                    return $right . ' ' . $unit;
                }
            }
        }
    }

public function response_summary($state) {
        if (strpos($state->answer, '|||||') === false) {
            $answer = $state->answer;
            $unit = '';
        } else {
            list($answer, $unit) = explode('|||||', $state->answer, 2);
        }

if (empty($answer) && empty($unit)) {
            $resp = null;
        } else {
            $resp = $answer;
        }

if (!empty($unit)) {
            if (!empty($this->question->options->unitsleft)) {
                $resp = trim($unit . ' ' . $resp);
            } else {
                $resp = trim($resp . ' ' . $unit);
            }
        }

return $resp;
    }

public function was_answered($state) {
        return !empty($state->answer);
    }

public function set_first_step_data_elements($state, &$data) {
        $data['_separators'] = '.$,';
    }

public function supply_missing_first_step_data(&$data) {
        $data['_separators'] = '.$,';
    }

public function set_data_elements_for_step($state, &$data) {
        if (empty($state->answer)) {
            return;
        }
        if (strpos($state->answer, '|||||') === false) {
            $data['answer'] = $state->answer;
        } else {
            list($answer, $unit) = explode('|||||', $state->answer, 2);
            if (!empty($this->question->options->showunits) &&
                    $this->question->options->showunits == 1) {
                // Multichoice units.
                $data['answer'] = $answer;
                $data['unit'] = $unit;
            } else if (!empty($this->question->options->unitsleft)) {
                if (!empty($unit)) {
                    $data['answer'] = $unit . ' ' . $answer;
                } else {
                    $data['answer'] = $answer;
                }
            } else {
                if (!empty($unit)) {
                    $data['answer'] = $answer . ' ' . $unit;
                } else {
                    $data['answer'] = $answer;
                }
            }
        }
    }
}