<?php
function admin_import() {
	global $PentabarfXMLhost, $PentabarfXMLpath;
	global $rooms_import;
	global $user;
	$html = "";

	$step = "input";
	if (isset ($_REQUEST['step']))
		$step = $_REQUEST['step'];

	$html .= '<p>';
	$html .= $step == "input" ? '<b>1. Input</b>' : '1. Input';
	$html .= ' &raquo; ';
	$html .= $step == "check" ? '<b>2. Validate</b>' : '2. Validate';
	$html .= ' &raquo; ';
	$html .= $step == "import" ? '<b>3. Import</b>' : '3. Import';
	$html .= '</p>';

	$import_file = '../import/import_' . $user['UID'] . '.xml';

	switch ($step) {
		case "input" :
			$ok = false;
			if ($test_handle = fopen('../import/tmp', 'w')) {
				fclose($test_handle);
				unlink('../import/tmp');
			} else {
				$msg = error("Webserver has no write-permission on import directory.", true);
			}

			if (isset ($_REQUEST['submit'])) {
				$ok = true;
				if (isset ($_REQUEST['user']) && $_REQUEST['user'] != "" && isset ($_REQUEST['password']) && $_REQUEST['password'] != "") {
					$fp = fsockopen("ssl://$PentabarfXMLhost", 443, $errno, $errstr, 5);

					if (!$fp) {
						$ok = false;
						$msg = error("File 'https://$PentabarfXMLhost/$PentabarfXMLpath" . $_REQUEST["url"] . "' not readable!" . "[$errstr ($errno)]", true);
					} else {
						$fileOut = fopen($import_file, "w");
						$head = 'GET /' . $PentabarfXMLpath . $_REQUEST["url"] . ' HTTP/1.1' . "\r\n" .
						'Host: ' . $PentabarfXMLhost . "\r\n" .
						'User-Agent: Engelsystem' . "\r\n" .
						'Authorization: Basic ' .
						base64_encode($_REQUEST["user"] . ':' . $_REQUEST["password"]) . "\r\n" .
						"\r\n";
						fputs($fp, $head);
						$Zeilen = -1;
						while (!feof($fp)) {
							$Temp = fgets($fp, 1024);

							// ende des headers
							if ($Temp == "f20\r\n") {
								$Zeilen = 0;
								$Temp = "";
							}

							//file ende?
							if ($Temp == "0\r\n")
								break;

							if (($Zeilen > -1) && ($Temp != "ffb\r\n")) {
								//steuerzeichen ausfiltern
								if (strpos("#$Temp", "\r\n") > 0)
									$Temp = substr($Temp, 0, strlen($Temp) - 2);
								if (strpos("#$Temp", "1005") > 0)
									$Temp = "";
								if (strpos("#$Temp", "783") > 0)
									$Temp = "";
								//schreiben in file
								fputs($fileOut, $Temp);
								$Zeilen++;
							}
						}
						fclose($fileOut);
						fclose($fp);
						$msg .= success("Es wurden $Zeilen Zeilen eingelesen.", true);
					}
				}
				elseif (isset ($_FILES['xcal_file']) && ($_FILES['xcal_file']['error'] == 0)) {
					if (move_uploaded_file($_FILES['xcal_file']['tmp_name'], $import_file)) {
						libxml_use_internal_errors(true);
						if (simplexml_load_file($import_file) === false) {
							$ok = false;
							$msg = error("No valid xml/xcal file provided.", true);
							unlink($import_file);
						}
					} else {
						$ok = false;
						$msg = error("File upload went wrong.", true);
					}
				} else {
					$ok = false;
					$msg = error("Please provide some data.", true);
				}
			}

			if ($ok)
				header("Location: " . page_link_to('admin_import') . "&step=check");
			else
				$html .= template_render('../templates/admin_import_input.html', array (
					'link' => page_link_to('admin_import'),
					'msg' => $msg,
					'url' => "https://$PentabarfXMLhost/$PentabarfXMLpath"
				));
			break;

		case "check" :
			if (!file_exists($import_file))
				header("Location: " . page_link_to('admin_import'));

			list ($rooms_new, $rooms_deleted) = prepare_rooms($import_file);
			list ($events_new, $events_updated, $events_deleted) = prepare_events($import_file);

			$html .= template_render('../templates/admin_import_check.html', array (
				'link' => page_link_to('admin_import'),
				'rooms_new' => count($rooms_new) == 0 ? "<tr><td>None</td></tr>" : table_body($rooms_new),
				'rooms_deleted' => count($rooms_deleted) == 0 ? "<tr><td>None</td></tr>" : table_body($rooms_deleted),
				'events_new' => count($events_new) == 0 ? "<tr><td>None</td><td></td><td></td><td></td><td></td></tr>" : table_body(shifts_printable($events_new)),
				'events_updated' => count($events_updated) == 0 ? "<tr><td>None</td><td></td><td></td><td></td><td></td></tr>" : table_body(shifts_printable($events_updated)),
				'events_deleted' => count($events_deleted) == 0 ? "<tr><td>None</td><td></td><td></td><td></td><td></td></tr>" : table_body(shifts_printable($events_deleted))
			));
			break;

		case "import" :
			if (!file_exists($import_file))
				header("Location: " . page_link_to('admin_import'));

			list ($rooms_new, $rooms_deleted) = prepare_rooms($import_file);
			foreach ($rooms_new as $room) {
				sql_query("INSERT INTO `Room` SET `Name`='" . sql_escape($room) . "', `FromPentabarf`='Y', `Show`='Y'");
				$rooms_import[trim($room)] = sql_id();
			}
			foreach ($rooms_deleted as $room)
				sql_query("DELETE FROM `Room` WHERE `Name`='" . sql_escape($room) . "' LIMIT 1");

			list ($events_new, $events_updated, $events_deleted) = prepare_events($import_file);
			foreach ($events_new as $event)
				sql_query("INSERT INTO `Shifts` SET `name`='" .
				sql_escape($event['name']) . "', `start`=" . sql_escape($event['start']) . ", `end`=" . sql_escape($event['end']) . ", `RID`=" . sql_escape($event['RID']) . ", `PSID`=" . sql_escape($event['PSID']) . ", `URL`='" . sql_escape($event['URL']) . "'");

			foreach ($events_updated as $event)
				sql_query("UPDATE `Shifts` SET `name`='" .
				sql_escape($event['name']) . "', `start`=" . sql_escape($event['start']) . ", `end`=" . sql_escape($event['end']) . ", `RID`=" . sql_escape($event['RID']) . ", `PSID`=" . sql_escape($event['PSID']) . ", `URL`='" . sql_escape($event['URL']) . "' WHERE `PSID`=" . sql_escape($event['PSID']) . " LIMIT 1");

			foreach ($events_deleted as $event)
				sql_query("DELETE FROM `Shifts` WHERE `PSID`=" .
				sql_escape($event['PSID']) . " LIMIT 1");

			unlink($import_file);

			$html .= template_render('../templates/admin_import_import.html', array ());
			break;
	}

	return $html;
}

function prepare_rooms($file) {
	global $rooms_import;
	$data = read_xml($file);

	// Load rooms from db for compare with input
	$rooms = sql_select("SELECT * FROM `Room` WHERE `FromPentabarf`='Y'");
	$rooms_db = array ();
	$rooms_import = array ();
	foreach ($rooms as $room) {
		$rooms_db[] = $room['Name'];
		$rooms_import[$room['Name']] = $room['RID'];
	}

	$events = $data->vcalendar->vevent;
	$rooms_pb = array ();
	foreach ($events as $event) {
		$rooms_pb[] = $event->location;
		if (!isset ($rooms_import[trim($event->location)]))
			$rooms_import[trim($event->location)] = trim($event->location);
	}
	$rooms_pb = array_unique($rooms_pb);

	$rooms_new = array_diff($rooms_pb, $rooms_db);
	$rooms_deleted = array_diff($rooms_db, $rooms_pb);

	return array (
		$rooms_new,
		$rooms_deleted
	);
}

function prepare_events($file) {
	global $rooms_import;
	$data = read_xml($file);

	$rooms = sql_select("SELECT * FROM `Room`");
	$rooms_db = array ();
	foreach ($rooms as $room)
		$rooms_db[$room['Name']] = $room['RID'];

	$events = $data->vcalendar->vevent;
	$shifts_pb = array ();
	foreach ($events as $event) {
		$event_pb = $event->children("http://pentabarf.org");
		$event_id = trim($event_pb-> {
			'event-id' });
		$shifts_pb[$event_id] = array (
			'start' => DateTime :: createFromFormat("Ymd\THis", $event->dtstart)->getTimestamp(),
			'end' => DateTime :: createFromFormat("Ymd\THis", $event->dtend)->getTimestamp(),
			'RID' => $rooms_import[trim($event->location)],
			'name' => trim($event->summary),
			'URL' => trim($event->url),
			'PSID' => $event_id
		);
	}

	$shifts = sql_select("SELECT * FROM `Shifts` WHERE `PSID` IS NOT NULL ORDER BY `start`");
	$shifts_db = array ();
	foreach ($shifts as $shift)
		$shifts_db[$shift['PSID']] = $shift;

	$shifts_new = array ();
	$shifts_updated = array ();
	foreach ($shifts_pb as $shift)
		if (!isset ($shifts_db[$shift['PSID']]))
			$shifts_new[] = $shift;
		else {
			$tmp = $shifts_db[$shift['PSID']];
			if ($shift['name'] != $tmp['name'] || $shift['start'] != $tmp['start'] || $shift['end'] != $tmp['end'] || $shift['RID'] != $tmp['RID'] || $shift['URL'] != $tmp['URL'])
				$shifts_updated[] = $shift;
		}

	$shifts_deleted = array ();
	foreach ($shifts_db as $shift)
		if (!isset ($shifts_pb[$shift['PSID']]))
			$shifts_deleted[] = $shift;

	return array (
		$shifts_new,
		$shifts_updated,
		$shifts_deleted
	);
}

function read_xml($file) {
	global $xml_import;
	if (!isset ($xml_import))
		$xml_import = simplexml_load_file($file);
	return $xml_import;
}

function shifts_printable($shifts) {
	global $rooms_import;
	$rooms = array_flip($rooms_import);

	uasort($shifts, 'shift_sort');

	$shifts_printable = array ();
	foreach ($shifts as $shift)
		$shifts_printable[] = array (
			'day' => date("l, Y-m-d", $shift['start']),
			'start' => date("H:i", $shift['start']),
			'name' => shorten($shift['name']),
			'end' => date("H:i", $shift['end']),
			'room' => $rooms[$shift['RID']]
		);
	return $shifts_printable;
}

function shift_sort($a, $b) {
	return ($a['start'] < $b['start']) ? -1 : 1;
}
?>