<?php

// Called after updates to rebuild all configs
if (Request::any('action') === 'rebuild' && isLocalExecution()) {
	ConfigTgz::rebuildAllConfigs();
	die('OK');
}

$ip = $_SERVER['REMOTE_ADDR'];
if (substr($ip, 0, 7) === '::ffff:') {
	$ip = substr($ip, 7);
}

$uuid = Request::any('uuid', false, 'string');
if ($uuid !== false && strlen($uuid) !== 36) {
	$uuid = false;
}

// What we do if we can't supply the requested config
function deliverEmpty($message)
{
	EventLog::failure($message);
	Header('HTTP/1.1 404 Not found');
	die('Config file could not be found or read!');
}

$locationId = false;
if (Module::isAvailable('locations')) {
	$locationId = Location::getFromIpAndUuid($ip, $uuid);
	if ($locationId !== false) {
		$locationChain = Location::getLocationRootChain($locationId);
		$locationChain[] = 0;
	}
}
if ($locationId === false) {
	$locationId = 0;
	$locationChain = array(0);
}

// Get config module path

// We get all the configs for the whole location chain up to root
$res = Database::simpleQuery("SELECT c.title, c.filepath, c.status, cl.locationid FROM configtgz c"
	. " INNER JOIN configtgz_location cl USING (configid)"
	. " WHERE cl.locationid IN (" . implode(',', $locationChain) . ")");

$best = 1000;
$row = false;
while ($r = $res->fetch(PDO::FETCH_ASSOC)) {
	settype($r['locationid'], 'int');
	$index = array_search($r['locationid'], $locationChain);
	if ($index === false || $index > $best)
		continue;
	if (!file_exists($r['filepath'])) {
		if ($r['locationid'] === 0) {
			EventLog::failure("The global config.tgz '{$r['title']}' was not found at '{$r['filepath']}'. Please regenerate the system configuration");
		} else {
			EventLog::warning("config.tgz '{$r['title']}' for location $locationId not found at '{$r['filepath']}', trying fallback....");
		}
		continue;
	}
	$best = $index;
	$row = $r;
}

if ($row === false) {
	// TODO Not found in DB
	deliverEmpty("No config.tgz for location $locationId found (src $ip)");
}

@ob_end_clean(); // Disable gzip output handler since this is already a compressed file
Header('Content-Type: application/gzip');
Header('Content-Disposition: attachment; filename=' . Util::sanitizeFilename($row['title']) . '.tgz');
$ret = readfile($row['filepath']);

if ($ret === false || $ret === 0) {
	// TODO didn't send anything/everything
	// Cannot deliver empty, don't know what has been send already
	EventLog::warning("Could not deliver config.tgz to client $ip: readfile() returned " . ($ret === false ? 'false' : $ret));
}

exit;