<?php // $Id$
/**
 * File in which the overview_report class is defined.
 * @package gradebook
 */

require_once($CFG->dirroot . '/grade/report/lib.php');
require_once($CFG->libdir.'/tablelib.php');

/**
 * Class providing an API for the overview report building and displaying.
 * @uses grade_report
 * @package gradebook
 */
class grade_report_overview extends grade_report {

    /**
     * The user.
     * @var object $user
     */
    var $user;

    /**
     * A flexitable to hold the data.
     * @var object $table
     */
    var $table;

    /**
     * Constructor. Sets local copies of user preferences and initialises grade_tree.
     * @param int $userid
     * @param object $gpr grade plugin return tracking object
     * @param string $context
     */
    function grade_report_overview($userid, $gpr, $context) {
        global $CFG, $COURSE;
        parent::grade_report($COURSE->id, $gpr, $context);

        // get the user (for full name)
        $this->user = get_record('user', 'id', $userid);

        // base url for sorting by first/last name
        $this->baseurl = $CFG->wwwroot.'/grade/overview/index.php?id='.$userid;
        $this->pbarurl = $this->baseurl;

        $this->setup_table();
    }

    /**
     * Prepares the headers and attributes of the flexitable.
     */
    function setup_table() {
        /*
        * Table has 3 columns
        *| course  | final grade | rank |
        */

        // setting up table headers
        $tablecolumns = array('coursename', 'grade', 'rank');
        $tableheaders = array($this->get_lang_string('coursename', 'grades'),
                              $this->get_lang_string('grade'),
                              $this->get_lang_string('rank', 'grades'));

        $this->table = new flexible_table('grade-report-overview-'.$this->user->id);

        $this->table->define_columns($tablecolumns);
        $this->table->define_headers($tableheaders);
        $this->table->define_baseurl($this->baseurl);

        $this->table->set_attribute('cellspacing', '0');
        $this->table->set_attribute('id', 'overview-grade');
        $this->table->set_attribute('class', 'boxaligncenter generaltable');

        $this->table->setup();
    }

    function fill_table() {
        global $CFG;
        $numusers = $this->get_numusers();

        if ($courses = get_courses('all', null, 'c.id, c.shortname')) {
            foreach ($courses as $course) {
                // Get course grade_item
                $grade_item_id = get_field('grade_items', 'id', 'itemtype', 'course', 'courseid', $course->id);

                // Get the grade
                $finalgrade = get_field('grade_grades', 'finalgrade', 'itemid', $grade_item_id, 'userid', $this->user->id);

                /// prints rank
                if ($finalgrade) {
                    /// find the number of users with a higher grade
                    $sql = "SELECT COUNT(DISTINCT(userid))
                            FROM {$CFG->prefix}grade_grades
                            WHERE finalgrade > $finalgrade
                            AND itemid = $grade_item_id";
                    $rank = count_records_sql($sql) + 1;

                    $rankdata = "$rank/$numusers";
                } else {
                    // no grade, no rank
                    $rankdata = "-";
                }

                $this->table->add_data(array($course->shortname, $finalgrade, $rankdata));
            }

            return true;
        } else {
            notify(get_string('nocourses', 'grades'));
            return false;
        }
    }

    /**
     * Prints or returns the HTML from the flexitable.
     * @param bool $return Whether or not to return the data instead of printing it directly.
     * @return string
     */
    function print_table($return=false) {
        ob_start();
        $this->table->print_html();
        $html = ob_get_clean();
        if ($return) {
            return $html;
        } else {
            echo $html;
        }
    }

    /**
     * Processes the data sent by the form (grades and feedbacks).
     * @var array $data
     * @return bool Success or Failure (array of errors).
     */
    function process_data($data) {
    }

}
?>
