<?php

function getNCVersionFromComposer($path) {
	if (!file_exists($path)) {
		throw new Exception('Composer file does not exists: '.$path);
	}
	if (!is_readable($path)) {
		throw new Exception('Composer file is not readable: '.$path);
	}
	$content = file_get_contents($path);
	$json = json_decode($content);
	if (!is_object($json)) {
		throw new Exception('Composer file does not contain valid JSON');
	}
	$dev = getValidProperty($json, 'require-dev');
	$v = getValidProperty($dev, 'christophwurst/nextcloud');
	if (substr($v, 0, 1) == '^') {
		$v = substr($v, 1);
	}
	if (substr($v, 0, 2) == '>=') {
		$v = substr($v, 2);
	}
	return $v;
}


function getNCVersionFromComposerBranchAlias($path) {
	if (!file_exists($path)) {
		throw new Exception('Composer file does not exists: '.$path);
	}
	if (!is_readable($path)) {
		throw new Exception('Composer file is not readable: '.$path);
	}
	$content = file_get_contents($path);
	$json = json_decode($content);
	if (!is_object($json)) {
		throw new Exception('Composer file does not contain valid JSON');
	}
	$extra = getValidProperty($json, 'extra');
	$branchAlias = getValidProperty($extra, 'branch-alias');
	$v = getValidProperty($branchAlias, 'dev-master');
	if (substr($v, -4) == '-dev') {
		$v = substr($v, 0, -4);
	}
	return $v;
}


function getValidProperty($json, $prop) {
	if (!property_exists($json, $prop)) {
		throw new Exception('Composer file has no "'.$prop.'" section');
	}
	return $json->{$prop};
}

function getDependencyVersionFromAppInfo($path, $type = 'nextcloud', $minmax = 'min') {
	if (!file_exists($path)) {
		throw new Exception('AppInfo does not exists: '.$path);
	}
	if (!is_readable($path)) {
		throw new Exception('AppInfo is not readable: '.$path);
	}
	$content = file_get_contents($path);
	$info = new SimpleXMLElement($content);
	$nc = $info->dependencies->$type;
	$v = (string)$nc->attributes()->{$minmax.'-version'};
	return $v;
}

function isServerBranch($branch) : bool {
	require_once dirname(__FILE__).'/../vendor/autoload.php';
	$http = new \GuzzleHttp\Client(['http_errors' => false]);
	$response = $http->request('GET', 'https://api.github.com/repos/nextcloud/server/branches/'.$branch);
	$status = $response->getStatusCode();
	switch ($status) {
	case 200:
		return true;
	case 404:
		return false;
	default:
		throw new \Exception('HTTP Error while checking branch '.$branch.' for Nextcloud server: '.$status);
	}
}

function versionCompare($sv1, $sv2, $type) {
	$v1 = explode('.', $sv1);
	$v2 = explode('.', $sv2);
	$count = min(count($v1), count($v2));
	for ($i = 0; $i < $count; $i++) {
		if ($type == 'max' && $v1[$i] < $v2[$i]) {
			return true;
		}
		if ($v1[$i] !== $v2[$i]) {
			return false;
		}
	}
	return true;
}

$pathAppInfo = __DIR__.'/../appinfo/info.xml';


if (in_array('--appinfo', $argv)) {
	echo getDependencyVersionFromAppInfo($pathAppInfo, 'nextcloud', 'min');
	exit;
}
if (in_array('--serverbranch', $argv)) {
	$ncVersion = getDependencyVersionFromAppInfo($pathAppInfo, 'nextcloud', 'min');
	$branch = 'stable' . $ncVersion;
	if (!isServerBranch($branch)) {
		$branch = 'master';
	}
	echo $branch;
	exit;
}
if (in_array('--php-min', $argv)) {
	echo getDependencyVersionFromAppInfo($pathAppInfo, 'php', 'min');
	exit;
}
if (in_array('--php-max', $argv)) {
	echo getDependencyVersionFromAppInfo($pathAppInfo, 'php', 'max');
	exit;
}

echo 'Testing Nextcloud version ';
try {
	$vComposer = getNCVersionFromComposer(__DIR__.'/../composer.json');
	if ($vComposer === 'dev-master') {
		$vComposer = getNCVersionFromComposerBranchAlias(__DIR__.'/../vendor/christophwurst/nextcloud/composer.json');
		$vAppInfo = getDependencyVersionFromAppInfo($pathAppInfo, 'nextcloud', 'max');
		$type = 'max';
	} else {
		$vAppInfo = getDependencyVersionFromAppInfo($pathAppInfo, 'nextcloud', 'min');
		$type = 'min';
	}
	echo $type.': '.$vAppInfo.' (AppInfo) vs. '.$vComposer.' (Composer) => ';
	if (versionCompare($vComposer, $vAppInfo, $type)) {
		echo 'OK'.PHP_EOL;
	} else {
		echo 'FAILED'.PHP_EOL;
		exit(1);
	}
} catch (Exception $e) {
	echo $e->getMessage().PHP_EOL;
	exit(1);
}