<?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/>.

/**
 * This file is responsible for displaying the survey
 *
 * @package   mod_survey
 * @copyright 1999 onwards Martin Dougiamas  {@link http://moodle.com}
 * @license   http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

    require_once("../../config.php");
    require_once("lib.php");

    $id = required_param('id', PARAM_INT);    // Course Module ID

    if (! $cm = get_coursemodule_from_id('survey', $id)) {
        print_error('invalidcoursemodule');
    }

    if (! $course = $DB->get_record("course", array("id"=>$cm->course))) {
        print_error('coursemisconf');
    }

    $PAGE->set_url('/mod/survey/view.php', array('id'=>$id));
    require_login($course, false, $cm);
    $context = context_module::instance($cm->id);

    require_capability('mod/survey:participate', $context);

    if (! $survey = $DB->get_record("survey", array("id"=>$cm->instance))) {
        print_error('invalidsurveyid', 'survey');
    }
    $trimmedintro = trim($survey->intro);
    if (empty($trimmedintro)) {
        $tempo = $DB->get_field("survey", "intro", array("id"=>$survey->template));
        $survey->intro = get_string($tempo, "survey");
    }

    if (! $template = $DB->get_record("survey", array("id"=>$survey->template))) {
        print_error('invalidtmptid', 'survey');
    }

// Update 'viewed' state if required by completion system
require_once($CFG->libdir . '/completionlib.php');
$completion = new completion_info($course);
$completion->set_module_viewed($cm);

    $showscales = ($template->name != 'ciqname');

    $strsurvey = get_string("modulename", "survey");
    $PAGE->set_title($survey->name);
    $PAGE->set_heading($course->fullname);
    echo $OUTPUT->header();
    echo $OUTPUT->heading($survey->name);

/// Check to see if groups are being used in this survey
    if ($groupmode = groups_get_activity_groupmode($cm)) {   // Groups are being used
        $currentgroup = groups_get_activity_group($cm);
    } else {
        $currentgroup = 0;
    }
    $groupingid = $cm->groupingid;

    if (has_capability('mod/survey:readresponses', $context) or ($groupmode == VISIBLEGROUPS)) {
        $currentgroup = 0;
    }

    if (has_capability('mod/survey:readresponses', $context)) {
        $numusers = survey_count_responses($survey->id, $currentgroup, $groupingid);
        echo "<div class=\"reportlink\"><a href=\"report.php?id=$cm->id\">".
              get_string("viewsurveyresponses", "survey", $numusers)."</a></div>";
    } else if (!$cm->visible) {
        notice(get_string("activityiscurrentlyhidden"));
    }

    if (!is_enrolled($context)) {
        echo $OUTPUT->notification(get_string("guestsnotallowed", "survey"));
    }


//  Check the survey hasn't already been filled out.

    if (survey_already_done($survey->id, $USER->id)) {
        $params = array(
            'objectid' => $survey->id,
            'context' => $context,
            'courseid' => $course->id,
            'other' => array('viewed' => 'graph')
        );
        $event = \mod_survey\event\course_module_viewed::create($params);
        $event->trigger();
        $numusers = survey_count_responses($survey->id, $currentgroup, $groupingid);

        if ($showscales) {
            // Ensure that graph.php will allow the user to see the graph.
            if (has_capability('mod/survey:readresponses', $context) || !$groupmode || groups_is_member($currentgroup)) {

                echo $OUTPUT->box(get_string("surveycompleted", "survey"));
                echo $OUTPUT->box(get_string("peoplecompleted", "survey", $numusers));

                echo '<div class="resultgraph">';
                survey_print_graph("id=$cm->id&amp;sid=$USER->id&amp;group=$currentgroup&amp;type=student.png");
                echo '</div>';
            } else {
                echo $OUTPUT->box(get_string("surveycompletednograph", "survey"));
                echo $OUTPUT->box(get_string("peoplecompleted", "survey", $numusers));
            }

        } else {

            echo $OUTPUT->box(format_module_intro('survey', $survey, $cm->id), 'generalbox', 'intro');
            echo $OUTPUT->spacer(array('height'=>30, 'width'=>1), true);  // should be done with CSS instead

            $questions = $DB->get_records_list("survey_questions", "id", explode(',', $survey->questions));
            $questionorder = explode(",", $survey->questions);
            foreach ($questionorder as $key => $val) {
                $question = $questions[$val];
                if ($question->type == 0 or $question->type == 1) {
                    if ($answer = survey_get_user_answer($survey->id, $question->id, $USER->id)) {
                        $table = new html_table();
                        $table->head = array(get_string($question->text, "survey"));
                        $table->align = array ("left");
                        $table->data[] = array(s($answer->answer1));//no html here, just plain text
                        echo html_writer::table($table);
                        echo $OUTPUT->spacer(array('height'=>30, 'width'=>1), true);
                    }
                }
            }
        }

        echo $OUTPUT->footer();
        exit;
    }

//  Start the survey form
    $params = array(
        'objectid' => $survey->id,
        'context' => $context,
        'courseid' => $course->id,
        'other' => array('viewed' => 'form')
    );
    $event = \mod_survey\event\course_module_viewed::create($params);
    $event->trigger();

    echo "<form method=\"post\" action=\"save.php\" id=\"surveyform\">";
    echo '<div>';
    echo "<input type=\"hidden\" name=\"id\" value=\"$id\" />";
    echo "<input type=\"hidden\" name=\"sesskey\" value=\"".sesskey()."\" />";

    echo $OUTPUT->box(format_module_intro('survey', $survey, $cm->id), 'generalbox boxaligncenter bowidthnormal', 'intro');
    echo '<div>'. get_string('allquestionrequireanswer', 'survey'). '</div>';

// Get all the major questions and their proper order
    if (! $questions = $DB->get_records_list("survey_questions", "id", explode(',', $survey->questions))) {
        print_error('cannotfindquestion', 'survey');
    }
    $questionorder = explode( ",", $survey->questions);

// Cycle through all the questions in order and print them

    global $qnum;  //TODO: ugly globals hack for survey_print_*()
    global $checklist; //TODO: ugly globals hack for survey_print_*()
    $qnum = 0;
    $checklist = array();
    foreach ($questionorder as $key => $val) {
        $question = $questions["$val"];
        $question->id = $val;

        if ($question->type >= 0) {

            if ($question->text) {
                $question->text = get_string($question->text, "survey");
            }

            if ($question->shorttext) {
                $question->shorttext = get_string($question->shorttext, "survey");
            }

            if ($question->intro) {
                $question->intro = get_string($question->intro, "survey");
            }

            if ($question->options) {
                $question->options = get_string($question->options, "survey");
            }

            if ($question->multi) {
                survey_print_multi($question);
            } else {
                survey_print_single($question);
            }
        }
    }

    if (!is_enrolled($context)) {
        echo '</div>';
        echo "</form>";
        echo $OUTPUT->footer();
        exit;
    }

    $checkarray = Array('questions'=>Array());
    if (!empty($checklist)) {
       foreach ($checklist as $question => $default) {
           $checkarray['questions'][] = Array('question'=>$question, 'default'=>$default);
       }
    }
    $PAGE->requires->data_for_js('surveycheck', $checkarray);
    $module = array(
        'name'      => 'mod_survey',
        'fullpath'  => '/mod/survey/survey.js',
        'requires'  => array('yui2-event'),
    );
    $PAGE->requires->string_for_js('questionsnotanswered', 'survey');
    $PAGE->requires->js_init_call('M.mod_survey.init', $checkarray, true, $module);

    echo '<br />';
    echo '<input type="submit" value="'.get_string("clicktocontinue", "survey").'" />';
    echo '</div>';
    echo "</form>";

    echo $OUTPUT->footer();


