/**

* Called to define this moodle form

*

* @return void

*/

public function definition() {

global $USER, $DB, $PAGE;

$mform =& $this->_form;

$course = $this->_customdata['course'];

$cm = $this->_customdata['cm'];

$modcontext = $this->_customdata['modcontext'];

$mform->addElement('header', 'general', get_string('export', 'attendance'));

$groupmode = groups_get_activity_groupmode($cm, $course);

$groups = groups_get_activity_allowed_groups($cm, $USER->id);

if ($groupmode == VISIBLEGROUPS or has_capability('moodle/site:accessallgroups', $modcontext)) {

$grouplist[0] = get_string('allparticipants');

}

if ($groups) {

foreach ($groups as $group) {

$grouplist[$group->id] = $group->name;

}

}

$mform->addElement('select', 'group', get_string('group'), $grouplist);

// Restrict the export to the selected users.

$namefields = get_all_user_name_fields(true, 'u');

$allusers = get_enrolled_users($modcontext, 'mod/attendance:canbelisted', 0, 'u.id,'.$namefields);

$userlist = array();

foreach ($allusers as $user) {

$userlist[$user->id] = fullname($user);

}

unset($allusers);

$tempusers = $DB->get_records('attendance_tempusers', array('courseid' => $course->id), 'studentid, fullname');

foreach ($tempusers as $user) {

$userlist[$user->studentid] = $user->fullname;

}

list($gsql, $gparams) = $DB->get_in_or_equal(array_keys($grouplist), SQL_PARAMS_NAMED);

list($usql, $uparams) = $DB->get_in_or_equal(array_keys($userlist), SQL_PARAMS_NAMED);

$params = array_merge($gparams, $uparams);

$groupmembers = $DB->get_recordset_select('groups_members', "groupid {$gsql} AND userid {$usql}", $params,

'', 'groupid, userid');

$groupmappings = array();

foreach ($groupmembers as $groupmember) {

if (!isset($groupmappings[$groupmember->groupid])) {

$groupmappings[$groupmember->groupid] = array();

}

$groupmappings[$groupmember->groupid][$groupmember->userid] = $userlist[$groupmember->userid];

}

if (isset($grouplist[0])) {

$groupmappings[0] = $userlist;

}

$mform->addElement('selectyesno', 'selectedusers', get_string('onlyselectedusers', 'mod_attendance'));

$sel = $mform->addElement('select', 'users', get_string('users', 'mod_attendance'), $userlist, array('size' => 12));

$sel->setMultiple(true);

$mform->disabledIf('users', 'selectedusers', 'eq', 0);

$opts = array('groupmappings' => $groupmappings);

$PAGE->requires->yui_module('moodle-mod_attendance-groupfilter', 'M.mod_attendance.groupfilter.init', array($opts));

$ident = array();

$ident[] =& $mform->createElement('checkbox', 'id', '', get_string('studentid', 'attendance'));

$ident[] =& $mform->createElement('checkbox', 'uname', '', get_string('username'));

$optional = array('idnumber', 'institution', 'department');

foreach ($optional as $opt) {

$ident[] =& $mform->createElement('checkbox', $opt, '', get_string($opt));

$mform->setType($opt, PARAM_NOTAGS);

}

$mform->addGroup($ident, 'ident', get_string('identifyby', 'attendance'), array('<br />'), true);

$mform->setDefaults(array('ident[id]' => true, 'ident[uname]' => true));

$mform->setType('id', PARAM_INT);

$mform->setType('uname', PARAM_INT);

$mform->addElement('checkbox', 'includeallsessions', get_string('includeall', 'attendance'), get_string('yes'));

$mform->setDefault('includeallsessions', true);

$mform->addElement('checkbox', 'includenottaken', get_string('includenottaken', 'attendance'), get_string('yes'));

$mform->addElement('checkbox', 'includeremarks', get_string('includeremarks', 'attendance'), get_string('yes'));

$mform->addElement('date_selector', 'sessionstartdate', get_string('startofperiod', 'attendance'));

$mform->setDefault('sessionstartdate', $course->startdate);

$mform->disabledIf('sessionstartdate', 'includeallsessions', 'checked');

$mform->addElement('date_selector', 'sessionenddate', get_string('endofperiod', 'attendance'));

$mform->disabledIf('sessionenddate', 'includeallsessions', 'checked');

$mform->addElement('select', 'format', get_string('format'),

array('excel' => get_string('downloadexcel', 'attendance'),

'ooo' => get_string('downloadooo', 'attendance'),

'text' => get_string('downloadtext', 'attendance')

));

$submitstring = get_string('ok');

$this->add_action_buttons(false, $submitstring);

$mform->addElement('hidden', 'id', $cm->id);

}

public function validation($data, $files) {

$errors = parent::validation($data, $files);

// Validate the 'users' field.

if ($data['selectedusers'] && empty($data['users'])) {

$errors['users'] = get_string('mustselectusers', 'mod_attendance');

}

return $errors;

}