function manage_display($task)
{
    global $cfg, $db, $cache;
    if ($task == '') {
        $task = 'status';
    }
    // Verify that the user has management perms for the selected contest
    $res =& db_query('contest_by_id', $_GET['id']);
    $res->fetchInto($row);
    $res->free();
    if ($_SESSION['user_id'] != $row['manager'] && !auth_user_in_group('Administrators')) {
        error("Access denied. You are not the contest-manager for this contest.");
    }
    switch ($task) {
        case 'status':
            $table = new HTML_Table();
            // Re-use $row from above
            if ($row['show_future'] == 1) {
                $status = 'Hidden (not activated yet)';
            } else {
                if ($row['begin_future'] == 1) {
                    $status = 'Not started';
                } else {
                    if ($row['end_future'] == 1) {
                        $status = 'Running';
                    } else {
                        $status = 'Ended';
                    }
                }
            }
            $table->addRow(array('Contest status: ', $status), null, 'TH');
            $table->addRow(array('Name: ', $row['name']));
            $table->addRow(array('Description: ', $row['description']));
            $table->addRow(array('Activation time: ', $row['show_time']));
            $table->addRow(array('Begin time: ', $row['begin_time']));
            $table->addRow(array('End time: ', $row['end_time']));
            if ($row['team_size'] != 1) {
                $table->addRow(array('Max size of team: ', $row['team_size']));
                $prefix = 'Teams';
            } else {
                $table->addRow(array('Individual event: ', 'Yes'));
                $prefix = 'Participants';
            }
            // No. of registered teams
            $res =& db_query('count_teams_by_contest_id', $_GET['id']);
            $res->fetchInto($row);
            $res->free();
            $table->addRow(array($prefix . ' registered: ', $row['count']));
            // No. of teams logged in
            $res =& db_query('count_last_teams_by_contest_id', $_GET['id']);
            $res->fetchInto($row);
            $res->free();
            $table->addRow(array($prefix . ' seen in last 30 minutes: ', $row['count']));
            $table->altRowAttributes(1, null, array("class" => "altrow"));
            echo '<div class="overflow">' . $table->toHtml() . '</div>';
            break;
        case 'problems':
            // display problem info as table
            $table = new HTML_Table();
            $res =& db_query('problems_by_contest_id', $_GET['id']);
            if (!$res->fetchInto($row)) {
                ?>
<p>No problems added yet.</p>			
			<?php 
            } else {
                // extra attributes
                $row['content'] = null;
                $row['actions'] = null;
                $table->addRow(array_keys($row), null, 'TH');
                while ($row) {
                    $row['content'] = "<a href=\"index.php?view=manage&amp;task=show_problem&amp;id={$_GET['id']}&amp;prob_id={$row['prob_id']}\">show</a>";
                    $row['actions'] = "<a href=\"index.php?view=manage&amp;task=edit_problem&amp;id={$_GET['id']}&amp;prob_id={$row['prob_id']}\">edit</a>, " . "<a href=\"index.php?view=manage&amp;task=del_problem&amp;id={$_GET['id']}&amp;prob_id={$row['prob_id']}\">delete</a>";
                    $table->addRow(array_values($row));
                    $res->fetchInto($row);
                }
                $res->free();
                // display tables
                $table->altRowAttributes(1, null, array("class" => "altrow"));
                echo '<div class="overflow">' . $table->toHtml() . '</div>';
            }
            echo "<hr />";
            // form for adding a problem
            $form = new HTML_QuickForm('problemAddForm', 'post', selflink());
            $form->addElement('header', null, 'Add a problem');
            $form->addElement('text', 'prob_id', 'Name (one word ID): ');
            $form->addElement('text', 'summary', 'Summary: ');
            $form->addElement('text', 'weight', 'Points weightage: ');
            $form->addElement('text', 'time_limit', 'Time limit: ');
            $form->addElement('text', 'mem_limit', 'Memory limit: ');
            $elem =& $form->addElement('textarea', 'content', 'Problem content (XML): ');
            $elem->setRows(10);
            $elem->setCols(80);
            $form->addElement('submit', null, 'Submit');
            $form->applyFilter('prob_id', 'trim');
            $form->applyFilter('summary', 'trim');
            $form->applyFilter('weight', 'trim');
            $form->applyFilter('time_limit', 'trim');
            $form->applyFilter('mem_limit', 'trim');
            $form->addRule('prob_id', 'Problem ID is required', 'required', null, 'client');
            $form->addRule('summary', 'Problem summary is required', 'required', null, 'client');
            $form->addRule('weight', 'Points weightage is required', 'required', null, 'client');
            $form->addRule('time_limit', 'Time limit is required', 'required', null, 'client');
            $form->addRule('mem_limit', 'Memory limit is required', 'required', null, 'client');
            $form->addRule('content', 'Problem content in XML is required', 'required', null, 'client');
            if ($form->validate()) {
                $data = $form->getSubmitValues();
                $errs = problem_check($data['content']);
                if ($errs == null) {
                    $data['contest_id'] = $_GET['id'];
                    $res =& $db->autoExecute('problems', $data, DB_AUTOQUERY_INSERT);
                    if (PEAR::isError($res)) {
                        error($res->toString());
                    }
                    $cache->remove(problem_cache_id($_GET['id'], $data['prob_id']) . '.htm');
                    $cache->remove(problem_cache_id($_GET['id'], $data['prob_id']) . '.prob');
                    redirect('index.php?view=manage&task=problems&id=' . $_GET['id']);
                } else {
                    ?>
<p><b>Error:</b> The problem could not be added due to the following errors encountered while
parsing the problem XML file. Please fix them and try submitting again.</p>
				<?php 
                    echo "<ol class=\"errors\">\n";
                    foreach ($errs as $line) {
                        echo "<li>{$line}</li>\n";
                    }
                    echo "</ol>\n<hr />\n";
                }
            }
            $form->display();
            break;
        case 'del_problem':
            db_query('del_problem_by_id', array($_GET['prob_id'], $_GET['id']));
            redirect('index.php?view=manage&task=problems&id=' . $_GET['id']);
            break;
        case 'edit_problem':
            $res =& db_query('problem_by_id', array($_GET['prob_id'], $_GET['id']));
            $res->fetchInto($row);
            $res->free();
            // Get XML content too
            $res =& db_query('problem_content_by_id', array($_GET['prob_id'], $_GET['id']));
            $res->fetchInto($row2);
            $res->free();
            $row['content'] =& $row2['content'];
            // form for editing a problem
            $form = new HTML_QuickForm('problemAddForm', 'post', selflink());
            $form->addElement('header', null, 'Edit a problem');
            $form->addElement('text', 'prob_id', 'Name (one word ID): ');
            $form->addElement('text', 'summary', 'Summary: ');
            $form->addElement('text', 'weight', 'Points weightage: ');
            $form->addElement('text', 'time_limit', 'Time limit: ');
            $form->addElement('text', 'mem_limit', 'Memory limit: ');
            $elem =& $form->addElement('textarea', 'content', 'Problem content (XML): ');
            $elem->setRows(10);
            $elem->setCols(80);
            $form->addElement('submit', null, 'Submit');
            $form->applyFilter('prob_id', 'trim');
            $form->applyFilter('summary', 'trim');
            $form->applyFilter('weight', 'trim');
            $form->applyFilter('time_limit', 'trim');
            $form->applyFilter('mem_limit', 'trim');
            $form->addRule('prob_id', 'Problem ID is required', 'required', null, 'client');
            $form->addRule('summary', 'Problem summary is required', 'required', null, 'client');
            $form->addRule('weight', 'Points weightage is required', 'required', null, 'client');
            $form->addRule('time_limit', 'Time limit is required', 'required', null, 'client');
            $form->addRule('mem_limit', 'Memory limit is required', 'required', null, 'client');
            $form->addRule('content', 'Problem content in XML is required', 'required', null, 'client');
            $form->setDefaults($row);
            if ($form->validate()) {
                $data = $form->getSubmitValues();
                $errs = problem_check($data['content']);
                if ($errs == null) {
                    //$data['contest_id'] = $_GET['id'];
                    $data['version'] = $row['version'] + 1;
                    // increment version
                    $res =& $db->autoExecute('problems', $data, DB_AUTOQUERY_UPDATE, 'contest_id=' . $_GET['id'] . " AND prob_id='" . $data['prob_id'] . "'");
                    if (PEAR::isError($res)) {
                        error($res->toString());
                    }
                    $cache->remove(problem_cache_id($_GET['id'], $data['prob_id']) . '.htm');
                    $cache->remove(problem_cache_id($_GET['id'], $data['prob_id']) . '.prob');
                    redirect('index.php?view=manage&task=problems&id=' . $_GET['id']);
                } else {
                    ?>
<p><b>Error:</b> The changes could not be saved due to the following errors encountered while
parsing the problem XML file. Please fix them and try submitting again.</p>
				<?php 
                    echo "<ol class=\"errors\">\n";
                    foreach ($errs as $line) {
                        echo "<li>{$line}</li>\n";
                    }
                    echo "</ol>\n<hr />\n";
                }
            }
            $form->display();
            break;
        case 'show_problem':
            $res =& db_query('problem_by_id', array($_GET['prob_id'], $_GET['id']));
            $res->fetchInto($problem);
            $res->free();
            problem_display($problem);
            break;
        case 'settings':
            // Re-using $row from above
            // form for editing the contest
            $form = new HTML_QuickForm('contestEditForm', 'post', selflink());
            $form->addElement('header', null, "Edit contest {$row['name']} (id: {$row['contest_id']})");
            $form->addElement('text', 'name', 'Name: ');
            $form->addElement('text', 'description', 'Description: ');
            $elem =& $form->addElement('text', 'team_size', 'Size of team: ');
            $elem->setValue('1');
            $date = getdate();
            $form->addElement('date', 'show_time', 'Activation time: ', array('format' => 'dMY H:i', 'minYear' => $date['year'], 'maxYear' => $date['year'] + 5));
            $form->addElement('date', 'begin_time', 'Begin time: ', array('format' => 'dMY H:i', 'minYear' => $date['year'], 'maxYear' => $date['year'] + 5));
            $form->addElement('date', 'end_time', 'End time: ', array('format' => 'dMY H:i', 'minYear' => $date['year'], 'maxYear' => $date['year'] + 5));
            $form->addElement('text', 'rules', 'Rules URL: ');
            $form->addElement('submit', null, 'Submit');
            // convert date format and store default values
            $row['show_time'] = sql2form_datetime($row['show_time']);
            $row['begin_time'] = sql2form_datetime($row['begin_time']);
            $row['end_time'] = sql2form_datetime($row['end_time']);
            $form->setDefaults($row);
            $form->applyFilter('name', 'trim');
            $form->applyFilter('description', 'trim');
            $form->applyFilter('team_size', 'trim');
            $form->addRule('name', 'Contest name is required.', 'required', null, 'client');
            $form->addRule('team_size', 'Team size is required.', 'required', null, 'client');
            // validate or display form
            if ($form->validate()) {
                $data = $form->getSubmitValues();
                $data['show_time'] = form2sql_datetime($data['show_time']);
                $data['begin_time'] = form2sql_datetime($data['begin_time']);
                $data['end_time'] = form2sql_datetime($data['end_time']);
                $db->autoExecute('contests', $data, DB_AUTOQUERY_UPDATE, 'contest_id=' . $_GET['id']);
                if (PEAR::isError($res)) {
                    error($db->toString());
                }
                redirect('index.php?view=manage&id=' . $_GET['id']);
            } else {
                $form->display();
            }
            break;
        case 'submissions':
            // Re-use $row from above
            if ($row['end_future'] != '1') {
                // Contest has ended, show system test button
                if ($row['tested'] != 1) {
                    ?>
    <p>Contest has ended. 
    <a class="button" href="index.php?view=manage&amp;&amp;task=test&amp;updateratings=false&amp;id=<?php 
                    echo $_GET['id'];
                    ?>
">Test and grade all submissions.</a>
    <a class="button" href="index.php?view=manage&amp;task=test&amp;updateratings=true&amp;id=<?php 
                    echo $_GET['id'];
                    ?>
">Update Ratings</a>

    </p>
                <?php 
                } else {
                    ?>
    <p>Contest has ended and system tests are over.
    <a class="button" href="index.php?view=manage&amp;task=test&amp;id=<?php 
                    echo $_GET['id'];
                    ?>
">Re-run system tests.</a>
    </p>
                <?php 
                }
            }
            // Show table of all solutions in the contest
            $table = new HTML_Table();
            $res =& db_query('solutions_by_contest_id', $_GET['id']);
            if (!$res->fetchInto($row)) {
                // If no solutions in yet
                ?>
<p>Sorry, no solutions have been submitted yet.</p>
			<?php 
            } else {
                $table->addRow(array_keys($row), null, 'TH');
                if ($row['score'] == '') {
                    $row['score'] = 'n/a';
                }
                if ($row['passed'] == '') {
                    $row['passed'] = 'n/a';
                }
                $table->addRow(array_values($row));
                while ($res->fetchInto($row)) {
                    if ($row['score'] == '') {
                        $row['score'] = 'n/a';
                    }
                    if ($row['passed'] == '') {
                        $row['passed'] = 'n/a';
                    }
                    $table->addRow(array_values($row));
                }
                $table->altRowAttributes(1, null, array("class" => "altrow"));
                echo '<div class="overflow">' . $table->toHtml() . '</div>';
            }
            break;
        case 'test':
            require_once 'tester.php';
            ob_end_clean();
            html_reset();
            html_header(null, $cfg["dir"]["themes"] . '/' . $_SESSION["theme"] . '.css', $cfg["dir"]["themes"] . '/' . $_SESSION["theme"] . '-ie.css', null, "submit_frame");
            $contest_id = $_GET['id'];
            $update_ratings = $_GET['updateratings'];
            session_write_close();
            test_contest($update_ratings, $contest_id);
            echo ' <a class="white" href="index.php?view=statistics&amp;task=contest&amp;id=' . $_GET['id'] . '">See the results.</a>';
            html_footer();
            exit;
    }
}
function admin_display($task)
{
    global $db, $cfg;
    if ($task == NULL) {
        $task = 'contests';
    }
    switch ($task) {
        case 'users':
            $table = new HTML_Table();
            $res =& db_query('users_list');
            $res->fetchInto($row);
            // add users table headers
            $headers = array_keys($row);
            array_push($headers, 'groups');
            array_push($headers, 'actions');
            $table->addRow($headers, null, 'TH');
            // add user records
            while ($row) {
                $res2 =& db_query('groups_by_user_id', $row['user_id']);
                // get list of gourps for this user
                $groups = '';
                $res2->fetchInto($row2);
                while ($row2) {
                    $groups .= $row2['name'];
                    if ($res2->fetchInto($row2)) {
                        $groups .= ', ';
                    }
                }
                $res2->free();
                array_push($row, $groups);
                // actions
                array_push($row, "<a href=\"index.php?view=admin&amp;task=edit_user&amp;id={$row['user_id']}\">edit</a>" . ", <a href=\"index.php?view=admin&amp;task=del_user&amp;id={$row['user_id']}\">delete</a>");
                $table->addRow(array_values($row));
                $res->fetchInto($row);
            }
            $res->free();
            $table->altRowAttributes(1, null, array("class" => "altrow"));
            echo '<div class="overflow">' . $table->toHtml() . '</div>';
            break;
        case 'del_user':
            db_query('del_user_by_id', $_GET['id']);
            db_query('del_user_perms_by_id', $_GET['id']);
            redirect('index.php?view=admin&task=users');
            break;
        case 'edit_user':
            // user id to edit given as arg
            $res =& db_query('groups_by_user_id', $_GET['id']);
            // get list of all groups for this user
            $user_groups = array();
            while ($res->fetchInto($row)) {
                array_push($user_groups, $row['group_id']);
            }
            $res->free();
            // get hanndle of user
            $res =& db_query('user_by_id', $_GET['id']);
            $res->fetchInto($row);
            $handle = $row['handle'];
            $res->free();
            $form = new HTML_QuickForm('userForm', 'post', 'index.php?view=admin&task=edit_user&id=' . $_GET['id']);
            $form->addElement('header', null, 'Groups for user ' . $handle . ' (id: ' . $_GET['id'] . ')');
            // get list of all available groups
            $res =& db_query('groups_list');
            // add checkbox for each group
            $groups = array();
            while ($res->fetchInto($row)) {
                $elem =& $form->addElement('checkbox', $row['group_id'], $row['name']);
                if (in_array($row['group_id'], $user_groups)) {
                    $elem->setChecked(true);
                }
                $groups[$row['group_id']] = $row['name'];
            }
            $res->free();
            $form->addElement('submit', 'submit', 'Apply Changes');
            if ($form->validate()) {
                $data = $form->getSubmitValues();
                foreach ($groups as $gid => $name) {
                    $elem =& $form->getElement($gid);
                    if ($data[$gid] == 1) {
                        auth_set_perm($_GET['id'], $gid);
                        $elem->setChecked(true);
                    } else {
                        auth_clear_perm($_GET['id'], $gid);
                        $elem->setChecked(false);
                    }
                }
            }
            $form->display();
            break;
        case 'groups':
            $table = new HTML_Table();
            $res =& db_query('groups_list');
            $res->fetchInto($row);
            // add groups table header
            $headers = array_keys($row);
            array_push($headers, 'views');
            array_push($headers, 'actions');
            $table->addRow($headers, null, 'TH');
            // add group records
            while ($row) {
                $res2 =& db_query('views_by_group_id', $row['group_id']);
                // get list of views allowed for this group
                $views = '';
                $res2->fetchInto($row2);
                while ($row2) {
                    $views .= $row2['view'];
                    if ($res2->fetchInto($row2)) {
                        $views .= ', ';
                    }
                }
                $res2->free();
                array_push($row, $views);
                array_push($row, "<a href=\"index.php?view=admin&amp;task=edit_group&amp;id={$row['group_id']}\">edit</a>" . ", <a href=\"index.php?view=admin&amp;task=del_group&amp;id={$row['group_id']}\">delete</a>");
                $table->addRow(array_values($row));
                $res->fetchInto($row);
            }
            $res->free();
            // decor
            $table->altRowAttributes(1, null, array("class" => "altrow"));
            echo '<div class="overflow">' . $table->toHtml() . '</div>';
            echo "<hr />";
            // form for adding a group
            $form = new HTML_QuickForm('addGroupForm', 'post', 'index.php?view=admin&task=groups');
            $form->addElement('header', null, 'Add a group');
            $form->addElement('text', 'name', 'Name: ');
            $form->addElement('submit', null, 'Submit');
            $form->applyFilter('name', 'trim');
            $form->addRule('name', 'Group name is required.', 'required', null, 'client');
            if ($form->validate()) {
                $res =& $db->autoExecute('groups', $form->getSubmitValues(), DB_AUTOQUERY_INSERT);
                if (PEAR::isError($res)) {
                    error($db->toString());
                }
                redirect('index.php?view=admin&task=groups');
            }
            $form->display();
            break;
        case 'del_group':
            db_query('del_group_by_id', $_GET['id']);
            redirect('index.php?view=admin&task=groups');
            break;
        case 'edit_group':
            // get list of views allowed for this group
            $group_views = array();
            $res =& db_query('views_by_group_id', $_GET['id']);
            while ($res->fetchInto($row)) {
                array_push($group_views, $row['view']);
            }
            $res->free();
            // get name of group
            $res =& db_query('group_by_id', $_GET['id']);
            $res->fetchInto($row);
            $name = $row['name'];
            $res->free();
            $form = new HTML_QuickForm('groupForm', 'post', 'index.php?view=admin&task=edit_group&id=' . $_GET['id']);
            $form->addElement('header', null, 'Views for group ' . $name . ' (id: ' . $_GET['id'] . ')');
            // get list of all available views
            $view_paths = glob($cfg['dir']['views'] . '/*.php');
            $views = array();
            // create the checkboxes, add each view to $views for later checking
            foreach ($view_paths as $path) {
                $tmp = explode('.', basename($path));
                $elem =& $form->addElement('checkbox', $tmp[0], $tmp[0]);
                if (in_array($tmp[0], $group_views)) {
                    $elem->setChecked(true);
                }
                array_push($views, $tmp[0]);
            }
            $form->addElement('submit', 'submit', 'Apply Changes');
            if ($form->validate()) {
                $data = $form->getSubmitValues();
                foreach ($views as $view) {
                    $elem =& $form->getElement($view);
                    if ($data[$view] == 1) {
                        auth_set_view($_GET['id'], $view);
                        $elem->setChecked(true);
                    } else {
                        auth_clear_view($_GET['id'], $view);
                        $elem->setChecked(false);
                    }
                }
            }
            $form->display();
            break;
        case 'views':
            $table = new HTML_Table();
            $table->addRow(array('name', 'path'), null, 'TH');
            // display list of views
            $view_paths = glob($cfg['dir']['views'] . '/*.php');
            foreach ($view_paths as $path) {
                $tmp = explode('.', basename($path));
                $table->addRow(array($tmp[0], $path));
            }
            $table->altRowAttributes(1, null, array("class" => "altrow"));
            echo '<div class="overflow">' . $table->toHtml() . '</div>';
            ?>
<p>To add a view, just drop a .php view-module file inside the views directory.
You can remove a view by deleting or renaming the corresponding file
inside the views directory.
</p> 
		<?php 
            break;
        case 'contests':
            $table = new HTML_Table();
            $res =& db_query('contests_list');
            $res->fetchInto($row);
            if ($row) {
                // add contests table headers
                $headers = array_keys($row);
                array_push($headers, 'actions');
                $table->addRow($headers, null, 'TH');
                // add contests table records
                while ($row) {
                    // Get the handle of the manager for displaying
                    $manager_name = '[none]';
                    $res2 =& $db->query($cfg['sql']['user_by_id'], $row['manager']);
                    if (!PEAR::isError($res2)) {
                        $res2->fetchInto($row2);
                        $manager_name = $row2['handle'];
                        $res2->free();
                    }
                    $row['manager'] = $manager_name;
                    // add edit,delete actions
                    $row['actions'] = "<a href=\"index.php?view=admin&amp;task=edit_contest&amp;id={$row['contest_id']}\">edit</a>, " . "<a href=\"index.php?view=admin&amp;task=del_contest&amp;id={$row['contest_id']}\">delete</a>";
                    $table->addRow(array_values($row));
                    $res->fetchInto($row);
                }
                $res->free();
                // decoration
                $table->altRowAttributes(1, null, array("class" => "altrow"));
                echo '<div class="overflow">' . $table->toHtml() . '</div>';
            } else {
                ?>
<p>No contests added yet.</p>			
			<?php 
            }
            echo "<hr />";
            // get list of all available managers
            $res =& db_query('users_by_group_name', 'Managers');
            while ($res->fetchInto($row)) {
                $managers[$row['user_id']] = $row['handle'];
            }
            // form for adding a contest
            $form = new HTML_QuickForm('contestAddForm', 'post', selflink());
            $form->addElement('header', null, 'Add a contest');
            $form->addElement('text', 'name', 'Name:');
            $form->addElement('text', 'description', 'Description:');
            $elem =& $form->addElement('text', 'team_size', 'Size of team:');
            $form->addElement('select', 'division', 'Division:', $cfg['tcl']['divisions']);
            $elem->setValue('1');
            $date = getdate();
            $form->addElement('date', 'show_time', 'Activation time:', array('format' => 'dMY H:i', 'minYear' => $date['year'], 'maxYear' => $date['year'] + 5));
            $form->addElement('date', 'begin_time', 'Begin time:', array('format' => 'dMY H:i', 'minYear' => $date['year'], 'maxYear' => $date['year'] + 5));
            $form->addElement('date', 'end_time', 'End time:', array('format' => 'dMY H:i', 'minYear' => $date['year'], 'maxYear' => $date['year'] + 5));
            $form->addElement('select', 'manager', 'Contest manager:', $managers);
            $form->addElement('submit', null, 'Submit');
            $form->applyFilter('name', 'trim');
            $form->applyFilter('description', 'trim');
            $form->applyFilter('team_size', 'trim');
            $form->addRule('name', 'Contest name is required.', 'required', null, 'client');
            $form->addRule('manager', 'Contest manager is required.', 'required', null, 'client');
            $form->addRule('team_size', 'Team size is required.', 'required', null, 'client');
            // validate or display form
            if ($form->validate()) {
                $data = $form->getSubmitValues();
                $data['show_time'] = form2sql_datetime($data['show_time']);
                $data['begin_time'] = form2sql_datetime($data['begin_time']);
                $data['end_time'] = form2sql_datetime($data['end_time']);
                $db->autoExecute('contests', $data, DB_AUTOQUERY_INSERT);
                if (PEAR::isError($res)) {
                    error($db->toString());
                }
                redirect('index.php?view=admin&task=contests');
            } else {
                $form->display();
            }
            break;
        case 'del_contest':
            $res =& db_query('del_contest_by_id', $_GET['id']);
            redirect('index.php?view=admin&task=contests');
            break;
        case 'edit_contest':
            // contest to edit given as arg
            $res =& db_query('contest_by_id', $_GET['id']);
            $res->fetchInto($row);
            $res->free();
            // get list of all available managers
            $res =& db_query('users_by_group_name', 'Managers');
            while ($res->fetchInto($row2)) {
                $managers[$row2['user_id']] = $row2['handle'];
            }
            // form for editing the contest
            $form = new HTML_QuickForm('contestEditForm', 'post', selflink());
            $form->addElement('header', null, "Edit contest {$row['name']} (id: {$row['contest_id']})");
            $form->addElement('text', 'name', 'Name:');
            $form->addElement('text', 'description', 'Description:');
            $elem =& $form->addElement('text', 'team_size', 'Size of team:');
            $elem->setValue('1');
            $form->addElement('select', 'division', 'Division:', $cfg['tcl']['divisions']);
            $date = getdate();
            $form->addElement('date', 'show_time', 'Activation time:', array('format' => 'dMY H:i', 'minYear' => $date['year'], 'maxYear' => $date['year'] + 5));
            $form->addElement('date', 'begin_time', 'Begin time:', array('format' => 'dMY H:i', 'minYear' => $date['year'], 'maxYear' => $date['year'] + 5));
            $form->addElement('date', 'end_time', 'End time:', array('format' => 'dMY H:i', 'minYear' => $date['year'], 'maxYear' => $date['year'] + 5));
            $form->addElement('select', 'manager', 'Contest manager:', $managers);
            $form->addElement('text', 'rules', 'Rules URL:');
            $form->addElement('submit', null, 'Submit');
            // convert date format and dtore default values
            $row['show_time'] = sql2form_datetime($row['show_time']);
            $row['begin_time'] = sql2form_datetime($row['begin_time']);
            $row['end_time'] = sql2form_datetime($row['end_time']);
            $form->setDefaults($row);
            $form->applyFilter('name', 'trim');
            $form->applyFilter('description', 'trim');
            $form->applyFilter('team_size', 'trim');
            $form->addRule('name', 'Contest name is required.', 'required', null, 'client');
            $form->addRule('manager', 'Contest manager is required.', 'required', null, 'client');
            $form->addRule('team_size', 'Team size is required.', 'required', null, 'client');
            // validate or display form
            if ($form->validate()) {
                $data = $form->getSubmitValues();
                $data['show_time'] = form2sql_datetime($data['show_time']);
                $data['begin_time'] = form2sql_datetime($data['begin_time']);
                $data['end_time'] = form2sql_datetime($data['end_time']);
                $db->autoExecute('contests', $data, DB_AUTOQUERY_UPDATE, 'contest_id=' . $_GET['id']);
                if (PEAR::isError($res)) {
                    error($db->toString());
                }
                redirect('index.php?view=admin&task=contests');
            } else {
                $form->display();
            }
            break;
        case 'shell':
            $form = new HTML_QuickForm('shellForm', 'post', selflink());
            $field =& $form->addElement('text', 'command', 'Command:');
            $field->setSize(100);
            $ifield =& $form->addElement('textarea', 'input', 'Standard Input:');
            $ifield->setRows(10);
            $ifield->SetCols(80);
            $form->addElement('submit', null, 'Submit');
            $form->display();
            if ($form->validate()) {
                // Write std input file
                $iname = tempnam("/tmp", "in");
                $ifile = fopen($iname, 'w');
                fwrite($ifile, $form->getSubmitValue('input'));
                fclose($ifile);
                $cmd = $form->getSubmitValue('command');
                echo "<pre class=\"shell_output\">";
                echo "<b>\$ " . html_escape($cmd) . "</b>\n";
                exec("{$cmd} 2>&1 < {$iname}", $out, $ret);
                foreach ($out as $line) {
                    echo html_escape($line) . "\n";
                }
                echo "</pre>\n";
                echo "<p>Command returned: {$ret}</p>\n";
            }
            break;
        case 'uploader':
            // Get list of directories to which files can be uploaded
            $dirs = subdir_list('.');
            array_unshift($dirs, './');
            $form = new HTML_QuickForm('uploaderForm', 'post', selflink());
            $form->addElement('header', null, 'Upload a File:');
            $file =& $form->addElement('file', 'file', 'File:');
            $form->addElement('select', 'dir', 'Destination:', $dirs);
            $form->addElement('submit', 'upload', 'Upload');
            $form->addRule('file', 'Please select file to upload.', 'required', null, 'client');
            $form->setMaxFileSize(10485760);
            // try 10 MB max file size
            if ($form->validate()) {
                if ($file->isUploadedFile()) {
                    $dir = $dirs[$form->getSubmitValue('dir')];
                    if ($file->moveUploadedFile($dir)) {
                        echo "<p>File uploaded successfully to {$dir}.</p>";
                    } else {
                        echo "<p>Failed to save uploaded file to {$dir} (insufficient permissions?).</p>";
                    }
                } else {
                    echo "<p>File upload did not finish successfully</p>";
                }
            }
            $form->display();
            echo "<p><b>Note:</b> Any previous file with the same name will be replaced.</p>";
            echo "<hr />";
            $form = new HTML_QuickForm('mkdirForm', 'post', selflink());
            $form->addElement('header', null, 'Create a Directory:');
            $form->addElement('text', 'name', 'Name:');
            $form->addElement('select', 'dir', 'Destination:', $dirs);
            $form->addElement('submit', 'mkdir', 'Mkdir');
            $form->addRule('name', 'Please enter directory name.', 'required', null, 'client');
            if ($form->validate()) {
                $path = $dirs[$form->getSubmitValue('dir')] . '/' . $form->getSubmitValue('name');
                if (file_exists($path)) {
                    echo "<p><b>Warning:</b> File or directory {$path} already exists.</p>";
                } else {
                    if (mkdir($path)) {
                        echo "<p>Directory {$path} created.</p>";
                    } else {
                        echo "<p>Failed to create directory {$path}. Make sure parent directory permissions allow it.</p>";
                    }
                }
            }
            $form->display();
            break;
        case 'phpinfo':
            phpinfo();
            break;
    }
}