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//
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//
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// You should have received a copy of the GNU General Public License
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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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// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
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/**
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/**
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 * This filter provides automatic linking to database activity entries
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 * when found inside every Moodle text.
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 * File only retained to prevent fatal errors in code that tries to require/include this.
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 *
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 *
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 * @todo MDL-82708 delete this file as part of Moodle 6.0 development.
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 * @package    filter
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 * @deprecated This file is no longer required in Moodle 4.5+.
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 * @subpackage data
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 * @package filter_data
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 * @copyright  2006 Vy-Shane Sin Fat
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 * @copyright Vy-Shane Sin Fat
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 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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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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 */
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defined('MOODLE_INTERNAL') || die();
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/**
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 * Database activity filtering
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 */
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class filter_data extends moodle_text_filter {
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    public function filter($text, array $options = array()) {
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        global $CFG, $DB, $USER;
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        // Trivial-cache - keyed on $cachedcourseid + $cacheduserid.
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        static $cachedcourseid = null;
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        static $cacheduserid = null;
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        static $coursecontentlist = array();
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        static $sitecontentlist = array();
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        static $nothingtodo;
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        // Try to get current course.
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        $coursectx = $this->context->get_course_context(false);
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defined('MOODLE_INTERNAL') || die();
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        if (!$coursectx) {
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            // We could be in a course category so no entries for courseid == 0 will be found.
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            $courseid = 0;
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        } else {
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            $courseid = $coursectx->instanceid;
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        }
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        if ($cacheduserid !== $USER->id) {
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            // Invalidate all caches if the user changed.
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            $coursecontentlist = array();
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            $sitecontentlist = array();
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            $cacheduserid = $USER->id;
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            $cachedcourseid = $courseid;
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            $nothingtodo = false;
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        } else if ($courseid != get_site()->id && $courseid != 0 && $cachedcourseid != $courseid) {
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            // Invalidate course-level caches if the course id changed.
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            $coursecontentlist = array();
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            $cachedcourseid = $courseid;
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            $nothingtodo = false;
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        }
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        if ($nothingtodo === true) {
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            return $text;
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        }
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        // If courseid == 0 only site entries will be returned.
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        if ($courseid == get_site()->id || $courseid == 0) {
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            $contentlist = & $sitecontentlist;
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        } else {
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            $contentlist = & $coursecontentlist;
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        }
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        // Create a list of all the resources to search for. It may be cached already.
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        if (empty($contentlist)) {
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            $coursestosearch = $courseid ? array($courseid) : array(); // Add courseid if found
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            if (get_site()->id != $courseid) { // Add siteid if was not courseid
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                $coursestosearch[] = get_site()->id;
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            }
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            // We look for text field contents only if have autolink enabled (param1)
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            list ($coursesql, $params) = $DB->get_in_or_equal($coursestosearch);
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            $sql = 'SELECT dc.id AS contentid, dr.id AS recordid, dc.content AS content, d.id AS dataid
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                      FROM {data} d
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                      JOIN {data_fields} df ON df.dataid = d.id
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                      JOIN {data_records} dr ON dr.dataid = d.id
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                      JOIN {data_content} dc ON dc.fieldid = df.id AND dc.recordid = dr.id
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                     WHERE d.course ' . $coursesql . '
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                       AND df.type = \'text\'
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                       AND ' . $DB->sql_compare_text('df.param1', 1) . " = '1'";
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            if (!$contents = $DB->get_records_sql($sql, $params)) {
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                $nothingtodo = true;
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                return $text;
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            }
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            foreach ($contents as $key => $content) {
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                // Trim empty or unlinkable concepts
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                $currentcontent = trim(strip_tags($content->content));
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                if (empty($currentcontent)) {
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                    unset($contents[$key]);
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                    continue;
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                } else {
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                    $contents[$key]->content = $currentcontent;
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                }
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                // Rule out any small integers.  See bug 1446
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                $currentint = intval($currentcontent);
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                if ($currentint && (strval($currentint) == $currentcontent) && $currentint < 1000) {
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                    unset($contents[$key]);
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                }
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            }
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            if (empty($contents)) {
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                $nothingtodo = true;
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                return $text;
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            }
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            usort($contents, 'filter_data::sort_entries_by_length');
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            foreach ($contents as $content) {
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                $href_tag_begin = '<a class="data autolink dataid'.$content->dataid.'" title="'.s($content->content).'" '.
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                                  'href="'.$CFG->wwwroot.'/mod/data/view.php?d='.$content->dataid.
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                                  '&amp;rid='.$content->recordid.'">';
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                $contentlist[] = new filterobject($content->content, $href_tag_begin, '</a>', false, true);
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            }
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            $contentlist = filter_remove_duplicates($contentlist); // Clean dupes
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        }
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        return filter_phrases($text, $contentlist);  // Look for all these links in the text
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    }
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    private static function sort_entries_by_length($content0, $content1) {
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        $len0 = strlen($content0->content);
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        $len1 = strlen($content1->content);
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        if ($len0 < $len1) {
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            return 1;
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        } else if ($len0 > $len1) {
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            return -1;
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        } else {
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            return 0;
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        }
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