<?php
/* For licensing terms, see /license.txt */

/**
 * Process links before pass it to search listing scripts.
 */
class link_processor extends search_processor
{
    public $links = [];

    public function __construct($rows)
    {
        $this->rows = $rows;

        // group all links together
        foreach ($rows as $row_id => $row_val) {
            $link_id = $row_val['xapian_data'][SE_DATA]['link_id'];
            $courseid = $row_val['courseid'];
            $item = [
                'courseid' => $courseid,
                'score' => $row_val['score'],
                'link_id' => $link_id,
                'row_id' => $row_id,
            ];
            $this->links[$courseid]['links'][] = $item;
            $this->links[$courseid]['total_score'] += $row_val['score'];
        }
    }

    public function process()
    {
        $results = [];
        foreach ($this->links as $courseCode => $one_course_links) {
            $course_info = api_get_course_info($courseCode);
            $search_show_unlinked_results = ('true' == api_get_setting('search_show_unlinked_results'));
            $course_visible_for_user = api_is_course_visible_for_user(null, $courseCode);
            // can view course?
            if ($course_visible_for_user || $search_show_unlinked_results) {
                $result = null;
                foreach ($one_course_links['links'] as $one_link) {
                    // is visible?
                    $visibility = api_get_item_visibility($course_info, TOOL_LINK, $one_link['link_id']);
                    if ($visibility) {
                        // if one is visible let show the result for a course
                        // also asume all data of this item like the data of the whole group of links(Ex. author)
                        list($thumbnail, $image, $name, $author, $url) = $this->get_information($courseCode, $one_link['link_id']);
                        $result_tmp = [
                            'toolid' => TOOL_LINK,
                            'score' => $one_course_links['total_score'] / (count($one_course_links) - 1), // not count total_score array item
                            'url' => $url,
                            'thumbnail' => $thumbnail,
                            'image' => $image,
                            'title' => $name,
                            'author' => $author,
                        ];
                        if ($course_visible_for_user) {
                            $result = $result_tmp;
                        } else { // course not visible for user
                            if ($search_show_unlinked_results) {
                                $result_tmp['url'] = '';
                                $result = $result_tmp;
                            }
                        }
                        break;
                    }
                }
                if (!is_null($result)) {
                    // if there is at least one link item found show link to course Links tool page
                    $results[] = $result;
                }
            }
        }

        // get information to sort
        foreach ($results as $key => $row) {
            $score[$key] = $row['score'];
        }

        // Sort results with score descending
        array_multisort($score, SORT_DESC, $results);

        return $results;
    }

    /**
     * Get document information.
     */
    private function get_information($course_id, $link_id)
    {
        $course_information = api_get_course_info($course_id);
        $course_id = $course_information['real_id'];
        $course_id_alpha = $course_information['id'];
        if (!empty($course_information)) {
            $item_property_table = Database::get_course_table(TABLE_ITEM_PROPERTY);

            $link_id = intval($link_id);
            $sql = "SELECT insert_user_id FROM $item_property_table
              		WHERE ref = $link_id AND tool = '".TOOL_LINK."' AND c_id = $course_id
              		LIMIT 1";

            $name = get_lang('Links');
            $url = api_get_path(WEB_PATH).'main/link/link.php?cidReq=%s';
            $url = sprintf($url, $course_id_alpha);
            // Get the image path
            $thumbnail = Display::returnIconPath('link.png');
            $image = $thumbnail; //FIXME: use big images
            // get author
            $author = '';
            $item_result = Database::query($sql);
            if ($row = Database::fetch_array($item_result)) {
                $user_data = api_get_user_info($row['insert_user_id']);
                $author = api_get_person_name($user_data['firstName'], $user_data['lastName']);
            }

            return [$thumbnail, $image, $name, $author, $url];
        } else {
            return [];
        }
    }
}
