<?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/>.

/**
 * XHTML question exporter.
 *
 * @package    qformat
 * @subpackage xhtml
 * @copyright  2005 Howard Miller
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */


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


/**
 * XHTML question exporter.
 *
 * Exports questions as static HTML.
 *
 * @copyright  2005 Howard Miller
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */
class qformat_xhtml extends qformat_default {

    public function provide_export() {
        return true;
    }

    protected function repchar($text) {
        return $text;
    }

    protected function writequestion($question) {
        global $OUTPUT;
        // turns question into string
        // question reflects database fields for general question and specific to type

        // if a category switch, just ignore
        if ($question->qtype=='category') {
            return '';
        }

        // initial string;
        $expout = "";
        $id = $question->id;

        // add comment and div tags
        $expout .= "<!-- question: $id  name: $question->name -->\n";
        $expout .= "<div class=\"question\">\n";

        // add header
        $expout .= "<h3>$question->name</h3>\n";

        // Format and add the question text.
        $text = question_rewrite_questiontext_preview_urls($question->questiontext,
                $question->contextid, 'qformat_xhtml', $question->id);
        $expout .= '<p class="questiontext">' . format_text($text,
                $question->questiontextformat, array('noclean' => true)) . "</p>\n";

        // selection depends on question type
        switch($question->qtype) {
        case 'truefalse':
            $st_true = get_string('true', 'qtype_truefalse');
            $st_false = get_string('false', 'qtype_truefalse');
            $expout .= "<ul class=\"truefalse\">\n";
            $expout .= "  <li><input name=\"quest_$id\" type=\"radio\" value=\"$st_true\" />$st_true</li>\n";
            $expout .= "  <li><input name=\"quest_$id\" type=\"radio\" value=\"$st_false\" />$st_false</li>\n";
            $expout .= "</ul>\n";
            break;
        case 'multichoice':
            $expout .= "<ul class=\"multichoice\">\n";
            foreach($question->options->answers as $answer) {
                $ans_text = $this->repchar( $answer->answer );
                if ($question->options->single) {
                    $expout .= "  <li><input name=\"quest_$id\" type=\"radio\" value=\"" . s($ans_text) . "\" />$ans_text</li>\n";
                }
                else {
                    $expout .= "  <li><input name=\"quest_$id\" type=\"checkbox\" value=\"" . s($ans_text) . "\" />$ans_text</li>\n";
                }
            }
            $expout .= "</ul>\n";
            break;
        case 'shortanswer':
            $expout .= html_writer::start_tag('ul', array('class' => 'shortanswer'));
            $expout .= html_writer::start_tag('li');
            $expout .= html_writer::label(get_string('answer'), 'quest_'.$id, false, array('class' => 'accesshide'));
            $expout .= html_writer::empty_tag('input', array('id' => "quest_$id", 'name' => "quest_$id", 'type' => 'text'));
            $expout .= html_writer::end_tag('li');
            $expout .= html_writer::end_tag('ul');
            break;
        case 'numerical':
            $expout .= html_writer::start_tag('ul', array('class' => 'numerical'));
            $expout .= html_writer::start_tag('li');
            $expout .= html_writer::label(get_string('answer'), 'quest_'.$id, false, array('class' => 'accesshide'));
            $expout .= html_writer::empty_tag('input', array('id' => "quest_$id", 'name' => "quest_$id", 'type' => 'text'));
            $expout .= html_writer::end_tag('li');
            $expout .= html_writer::end_tag('ul');
            break;
        case 'match':
            $expout .= html_writer::start_tag('ul', array('class' => 'match'));

            // build answer list
            $ans_list = array();
            foreach($question->options->subquestions as $subquestion) {
               $ans_list[] = $this->repchar( $subquestion->answertext );
            }
            shuffle( $ans_list ); // random display order

            // Build select options.
            $selectoptions = array();
            foreach($ans_list as $ans) {
                $selectoptions[s($ans)] = s($ans);
            }

            // display
            $option = 0;
            foreach($question->options->subquestions as $subquestion) {
                // build drop down for answers
                $quest_text = $this->repchar( $subquestion->questiontext );
                if ($quest_text != '') {
                    $dropdown = html_writer::label(get_string('answer', 'qtype_match', $option+1), 'quest_'.$id.'_'.$option, false, array('class' => 'accesshide'));
                    $dropdown .= html_writer::select($selectoptions, "quest_{$id}_{$option}", '', false, array('id' => "quest_{$id}_{$option}"));
                    $expout .= html_writer::tag('li', $quest_text);
                    $expout .= $dropdown;
                    $option++;
                }
            }
            $expout .= html_writer::end_tag('ul');
            break;
        case 'description':
            break;
        case 'multianswer':
        default:
            $expout .= "<!-- export of $question->qtype type is not supported  -->\n";
        }
        // close off div
        $expout .= "</div>\n\n\n";
        return $expout;
    }


    protected function presave_process($content) {
        // override method to allow us to add xhtml headers and footers

        global $CFG;

        // get css bit
        $css_lines = file( "$CFG->dirroot/question/format/xhtml/xhtml.css" );
        $css = implode( ' ',$css_lines );

        $xp =  "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\"\n";
        $xp .= "  \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\n";
        $xp .= "<html xmlns=\"http://www.w3.org/1999/xhtml\">\n";
        $xp .= "<head>\n";
        $xp .= "<meta http-equiv=\"content-type\" content=\"text/html; charset=UTF-8\" />\n";
        $xp .= "<title>Moodle Quiz XHTML Export</title>\n";
        $xp .= $css;
        $xp .= "</head>\n";
        $xp .= "<body>\n";
        $xp .= "<form action=\"...REPLACE ME...\" method=\"post\">\n\n";
        $xp .= $content;
        $xp .= "<p class=\"submit\">\n";
        $xp .= "  <input type=\"submit\" />\n";
        $xp .= "</p>\n";
        $xp .= "</form>\n";
        $xp .= "</body>\n";
        $xp .= "</html>\n";

        return $xp;
    }

    public function export_file_extension() {
        return '.html';
    }
}
