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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
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namespace mod_quiz\question;
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defined('MOODLE_INTERNAL') || die();
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require_once($CFG->dirroot . '/question/engine/lib.php');
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/**
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 * An extension of question_display_options that includes the extra options used by the quiz.
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 *
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 * @package   mod_quiz
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 * @category  question
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 * @copyright 2022 The Open University
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 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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 */
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class display_options extends \question_display_options {
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    /**
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     * The bitmask patterns use in the review option settings.
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     *
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     * In the quiz settings, the review... (e.g. reviewmarks) values are
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     * bit patterns that allow what is visible to be change at different times.
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     * These constants define which bit is for which time.
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     *
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     * @var int bit used to indicate 'during the attempt'.
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     */
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    const DURING = 0x10000;
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    /** @var int as above, bit used to indicate 'immediately after the attempt'. */
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    const IMMEDIATELY_AFTER = 0x01000;
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    /** @var int as above, bit used to indicate 'later while the quiz is still open'. */
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    const LATER_WHILE_OPEN = 0x00100;
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    /** @var int as above, bit used to indicate 'after the quiz is closed'. */
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    const AFTER_CLOSE = 0x00010;
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    /**
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     * @var bool if this is false, then the student is not allowed to review
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     * anything about the attempt.
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     */
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    public $attempt = true;
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    /**
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     * @var int whether the attempt overall feedback is visible.
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     */
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    public $overallfeedback = self::VISIBLE;
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    /**
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     * Set up the various options from the quiz settings, and a time constant.
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     *
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     * @param \stdClass $quiz the quiz settings from the database.
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     * @param int $when of the constants {@see DURING}, {@see IMMEDIATELY_AFTER},
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     *      {@see LATER_WHILE_OPEN} or {@see AFTER_CLOSE}.
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     * @return display_options instance of this class set up appropriately.
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     */
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    public static function make_from_quiz(\stdClass $quiz, int $when): self {
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        $options = new self();
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        $options->attempt = self::extract($quiz->reviewattempt, $when, true, false);
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        $options->correctness = self::extract($quiz->reviewcorrectness, $when);
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        $options->marks = self::extract($quiz->reviewmaxmarks, $when,
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                self::extract($quiz->reviewmarks, $when, self::MARK_AND_MAX, self::MAX_ONLY), self::HIDDEN);
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        $options->feedback = self::extract($quiz->reviewspecificfeedback, $when);
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        $options->generalfeedback = self::extract($quiz->reviewgeneralfeedback, $when);
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        $options->rightanswer = self::extract($quiz->reviewrightanswer, $when);
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        $options->overallfeedback = self::extract($quiz->reviewoverallfeedback, $when);
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        $options->numpartscorrect = $options->feedback;
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        $options->manualcomment = $options->feedback;
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        if ($quiz->questiondecimalpoints != -1) {
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            $options->markdp = $quiz->questiondecimalpoints;
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        } else {
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            $options->markdp = $quiz->decimalpoints;
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        }
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        return $options;
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    }
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    /**
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     * Helper function to return one value or another depending on whether one bit is set.
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     *
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     * @param int $setting the setting to unpack (e.g. $quiz->reviewmarks).
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     * @param int $when of the constants {@see DURING}, {@see IMMEDIATELY_AFTER},
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     *      {@see LATER_WHILE_OPEN} or {@see AFTER_CLOSE}.
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     * @param bool|int $whenset value to return when the bit is set.
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     * @param bool|int $whennotset value to return when the bit is set.
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     * @return bool|int $whenset or $whennotset, depending.
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     */
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    protected static function extract(int $setting, int $when,
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            $whenset = self::VISIBLE, $whennotset = self::HIDDEN) {
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        if ($setting & $when) {
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            return $whenset;
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        } else {
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            return $whennotset;
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        }
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    }
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}