<?php

defined('MOODLE_INTERNAL') || die();
class block_hshcourselist extends block_base {
    private $globalconf;
    public function init() {
        $this->globalconf = get_config('block_hshcourselist');
        $this->title = get_string('default_blocktitle', 'block_hshcourselist');
    }

    //stop it showing up on any add block lists
    public function applicable_formats() {
        return (array(
            'all' => false,
            'site' => true,
            'my' => true,
            'course-index' => true
        ));
    }

    public function has_config() {
        return true;
    }

    public function get_content() {
        global $CFG, $DB, $OUTPUT;

        $this->page->requires->js('/blocks/hshcourselist/javascript/jquery-3.2.0.min.js');
        $this->page->requires->css('/blocks/hshcourselist/style.css');

        if ($this->content !== null) {
            return $this->content;
        }

        $this->content = new stdClass();
        $context_block = context_block::instance($this->instance->id);
        $search = optional_param('hshcoursesearch', '', PARAM_TEXT);

        $hshcoursesubmit = optional_param('hshcoursesubmit', false, PARAM_TEXT);
        // set placeholder
        if($this->config->placeholder) {
            $placeholder = $this->config->placeholder;
        } else {
            $placeholder = "";
        }
        $list_contents = '';
        $anchor = html_writer::tag('a', '', array('name' => 'hshcourselistanchor'));

        $ordercheckbox = html_writer::empty_tag('input', array('type' => 'checkbox', 'name' => 'orderbysemestercheckbox', 'id' => 'orderbysemestercheckbox_id'));
        $ordercheckbox .= html_writer::start_tag('label', array('for' => 'orderbysemestercheckbox_id'));
        $ordercheckbox .= get_string('orderbysemester', 'block_hshcourselist');
        $ordercheckbox .= html_writer::end_tag('label');

        $idSearchinglabel = html_writer::empty_tag('p', array('class' => 'idSarchingLabel'));
        $idSearchinglabel .= get_string('idSearchingLabel', 'block_hshcourselist');
        $idSearchinglabel .= html_writer::end_tag('p');

        $inputattrs = array(
            'autocomplete' => 'off',
            'name' => 'hshcourselistsearch',
            'id' => 'hshcourselistsearch',
            'class' => 'form-control',
            'value' => $search,
            'placeholder' => $placeholder
        );
        $input = html_writer::empty_tag('input', $inputattrs);

        $questionattrs = array(
            'class' => 'icon fa fa-question-circle text-info fa-fw',
            'title' => 'Hilfe für HsH Kurssuche',
            'aria-label' => 'Hilfe für HsH Kurssuche',
            'aria-hidden' => 'true'
        );

        $atagparams = array(
            'class'=>'btn btn-link p-0',
            'role'=>'button',
            'data-container'=>'body',
            'data-toggle'=>'popover',
            'data-placement'=>'right',
            'data-content'=>"<div class='no-overflow'><p>Die Kurssuche ist eine Volltextsuche in der Sie auch mehrere Suchbegriffe (mit Leerzeichen getrennt) eingeben können.<br/>
               Verschiedene Suchbegriffe werden einzeln in den Kursnamen gesucht und dann eine vollständige Liste angezeigt.<br/>
                Bsp: WiSe Programmieren => zeigt Ihnen alle Kurse, dessen Kursname oder Kurskurzname 'WiSe' <i>UND</i> 'Programmieren' enthalten.</p>
                <p>Kurzsuche: Möchten Sie einen Kurs schnell über die <i>'id'</i> finden, so können Sie dies durch das Voranstellen einer Raute <i>'#'</i> erreichen.<br/>
                Bsp: <i>#3303</i> zeigt Ihnen den Kurs <i>'Moodle Demo-Kurs, ELC'</i></p>",
            'data-html'=>'true',
            'tabindex'=>'0',
            'data-trigger'=>'focus',
            'data-original-title'=>'',
            'title'=>''
        );

        $questionhsh = html_writer::start_span("helpbutton");
        $questionhsh .= html_writer::start_tag('a', $atagparams);
        $questionhsh .= html_writer::start_tag('i', $questionattrs);
        $questionhsh .= html_writer::end_tag('i');
        $questionhsh .= html_writer::end_tag('a');
        $questionhsh .= html_writer::end_span();

        $progressattrs = array(
            'src' => $OUTPUT->image_url('i/loading_small', 'moodle'),
            'class' => 'hshcourseprogress',
            'id' => 'hshcourseprogress',
            'alt' => get_string('loading', 'block_hshcourselist')
        );
        $progress = html_writer::empty_tag('img', $progressattrs);

        $formattrs = array(
            'id' => 'hshcourseform',
            'method' => 'post',
            'name' => 'hshcourselistform',
            'action' => new moodle_url('/')
        );

        $form = html_writer::tag('form', $idSearchinglabel.$ordercheckbox.$questionhsh.$input.$progress, $formattrs);
        if (!empty($hshcoursesubmit)) {
            $courses = self::get_courses($search, $context_block, $this->globalconf->splitterms,
                $this->globalconf->restrictcontext, $this->page->context,
                $this->globalconf->idSearching, $this->config->orderbysemester);

            if (!empty($courses)) {
                foreach ($courses as $course) {
                    $url = new moodle_url('/course/view.php', array('id' => $course->id));
                    $resultstr = null;
                    if (!empty($this->config->displaymode)) {
                        $displaymode = $this->config->displaymode;
                    } else {
                        $displaymode = 2;
                    }
                    switch ($displaymode):
                        case 1: $resultstr = $course->shortname; break;
                        case 2: $resultstr = $course->fullname; break;
                        default: $resultstr = $course->shortname.': '.$course->fullname; break;
                    endswitch;

                    $link = html_writer::tag('a', $resultstr, array('href' => $url->out()));
                    $li = html_writer::tag('li', $link);
                    $list_contents .= $li;
                }
            }
        }

        if(!isset($this->config->orderbysemester)) {
            $orderbysemester = false;
        } else {
            $orderbysemester = $this->config->orderbysemester;
        }
        if(!isset($this->config->displaymode)) {
            $displaymode = 2;
        } else {
            $displaymode = $this->config->displaymode;
        }

        $list = html_writer::tag('ul', $list_contents, array('id' => 'hshcourselistul'));
        $this->content->text = $anchor.$form.$list;
        $jsdata = array(
            'instanceid' => $this->instance->id,
            'sesskey' => sesskey(),
            'displaymode' => $displaymode,
            'orderbysemester' => $orderbysemester,
            'contextid' => $this->page->context->id
        );
        $this->page->requires->js_call_amd('block_hshcourselist/jmodule', 'init', array($jsdata, $CFG->wwwroot));

        //Einstellungen für den Custom-Footer
        if (!empty($this->config->footer) && $this->config->enablefooter) {
            $this->content->footer = $this->config->footer;
        }

        //Einstellungen für den Custom-Header
        if (!empty($this->config->title) && $this->config->enablecustomheader) {
            $this->title = $this->config->title;
        }
        $this->page->requires->js_call_amd('block_hshcourselist/listselect', 'init', array($CFG->wwwroot));
        return $this->content;
    }

    public static function get_courses($search, $blockcontext, $splitterms = false, $restrictcontext = false, $pagecontext = null, $idSearch, $orderbysemester) {
        global $DB;
        $params = array(SITEID);
        $keywordArray = explode(" ", $search);
        foreach($keywordArray as $key => $value) {
            $keywordArray[$key] = "%".$keywordArray[$key]."%";
        }
        $where = 'id != ? AND (';
        if ($splitterms) {
            $terms = explode(' ', $search);
            $like = '%1$s LIKE';
            foreach ($terms as $key => $term) {
                $like .= ' ?';
                if ($key < count($terms)-1) {
                    $like .= ' AND %1$s LIKE';
                }
                $terms[$key] = '%'.$term.'%';
            }
            $params = array_merge($params, $terms, $terms);
            $where .= sprintf($like, 'shortname').' OR '.sprintf($like, 'fullname');
        } else {
            if($idSearch) {
                $params = array_merge($params, array($search));
                $where .= 'id = ?';
            } else {
                $params = array_merge($params, $keywordArray);
                $where .= 'fullname ILIKE ?';
                for ($i = 0; $i <= count($keywordArray)-2; $i++) {
                    $where .= ' AND fullname ILIKE ? OR shortname ILIKE ?';
                }
            }
        }
        $where .= ')';
        if (!has_capability('moodle/course:viewhiddencourses', $blockcontext)) {
            $where .= ' AND visible=1';
        }
        if ($restrictcontext) {
            if ($pagecontext && $pagecontext->get_level_name() == get_string('category')) {
                $where .= ' AND category = ?';
                $params[] = $pagecontext->instanceid;
            }
        }
        if($orderbysemester) {
            $order = 'startdate DESC';
        } else if($idSearch) {
            $order = 'idnumber';
        } else {
            $order = 'fullname';
        }

        $fields = 'id, idnumber, shortname, fullname';
        $courses = $DB->get_recordset_select('course', $where, $params, $order, $fields);
        return $courses;
    }
}