<?php

require 'vendor/autoload.php';

function checkDNS($domain)
{
    if (!preg_match('/(?=^.{4,253}$)(^((?!-)[a-zA-Z0-9-]{0,62}[a-zA-Z0-9]\.)+[a-zA-Z]{2,63}$)/', strtolower($domain))) {
        throw new Exception('not valid domain : "'.$domain.'".');
    }
    $currentip = dns_get_record($domain, DNS_A + DNS_AAAA);
    if (empty($currentip)) {
        throw new Exception('the domain '.$domain.' was not found in DNS record.');
    }
    if ($currentip[0]['ip'] !== $_SERVER['ip4']) {
        throw new Exception('the current ip v4 address of '.$domain.' is '.$currentip[0]['ip'].'. it should be '.$_SERVER['ip4']);
    }
    if ($currentip[1]['ipv6'] !== $_SERVER['ip6']) {
        throw new Exception('the current ip v6 address of '.$domain.' is '.$currentip[1]['ipv6'].'. it should be '.$_SERVER['ip6']);
    }
    return true;
}

function checkIfInstalled($domain)
{
    exec('find /home/* -maxdepth 1 -type d | grep '.$domain, $output);
    if (!empty($output)) {
        throw new Exception('the domain '.$domain.' was already found on the server.');
    }
}

function checkIfUserExist($user)
{
    exec('cut -d: -f1 /etc/passwd | grep '.$user, $output);
    return !empty($output);
}

function generateUserFromDomain($domain, $recursive = null)
{
    if ($recursive == 100) {
        throw new Exception('Too much users found, 100 that is too much for '.$domain);
    }
    $user = str_split(str_replace([$_SERVER['maindomain'], '-', '.'], '', $domain), 30)[0].$recursive;
    // try anthor username if user exists or if reserved name
    if (checkIfUserExist($user) || in_array($user, explode(',', $_SERVER['reservedsubdomains']))) {
        if ($recursive === null) {
            $recursive = 1;
        }
        $user = generateUserFromDomain($domain, $recursive + 1);
    }
    return $user;
}

function findUserFromExistingDomain($domain)
{
    exec('find /home/* -maxdepth 1 -type d | grep '.$domain, $output);
    if (empty($output)) {
        throw new Exception('the domain '.$domain.' was not found on the server.');
    } else {
        return str_replace(['/home/', '/'.$domain], '', $output[0]);
    }
}

function generatePassword($length = 32, $add_dashes = false, $available_sets = 'luds')
{
    $sets = array();
    if (strpos($available_sets, 'l') !== false) {
        $sets[] = 'abcdefghjkmnpqrstuvwxyz';
    }
    if (strpos($available_sets, 'u') !== false) {
        $sets[] = 'ABCDEFGHJKMNPQRSTUVWXYZ';
    }
    if (strpos($available_sets, 'd') !== false) {
        $sets[] = '23456789';
    }
    if (strpos($available_sets, 's') !== false) {
        $sets[] = '!@#$%&*?';
    }

    $all = '';
    $password = '';
    foreach ($sets as $set) {
        $password .= $set[array_rand(str_split($set))];
        $all .= $set;
    }

    $all = str_split($all);
    for ($i = 0; $i < $length - count($sets); $i++) {
        $password .= $all[array_rand($all)];
    }

    $password = str_shuffle($password);

    if (!$add_dashes) {
        return $password;
    }

    $dash_len = floor(sqrt($length));
    $dash_str = '';
    while (strlen($password) > $dash_len) {
        $dash_str .= substr($password, 0, $dash_len) . '-';
        $password = substr($password, $dash_len);
    }
    $dash_str .= $password;
    return $dash_str;
}

function createSQLUserAndDatabase($user, $type)
{
    $pass = generatePassword();
    exec('mysql -u '.$_SERVER['mysqluser'].' -p\''.$_SERVER['mysqlpassword'].'\' -e \'CREATE DATABASE IF NOT EXISTS '.$user.';\'', $output);
    exec('mysql -u '.$_SERVER['mysqluser'].' -p\''.$_SERVER['mysqlpassword'].'\' -e "CREATE USER IF NOT EXISTS \''.$user.'\'@\'localhost\' IDENTIFIED BY \''.$pass.'\';"', $output);
    exec('mysql -u '.$_SERVER['mysqluser'].' -p\''.$_SERVER['mysqlpassword'].'\' -e "GRANT ALL PRIVILEGES ON '.$user.'.* TO \''.$user.'\'@\'localhost\';"', $output);
    exec('mysql -u '.$_SERVER['mysqluser'].' -p\''.$_SERVER['mysqlpassword'].'\' -e "FLUSH PRIVILEGES;"', $output);
    $databaseModel = ($type === 'solo') ? $_SERVER['solomodel'] : $_SERVER['fermemodel'];
    exec('mysqldump -u '.$_SERVER['mysqluser'].' -p\''.$_SERVER['mysqlpassword'].'\' -v '.$databaseModel.' | mysql -u '.$user.' -p\''.$pass.'\' -D '.$user, $output);
    // TODO: add first user and make him admin
    return ['database' => $user, 'user' => $user, 'password' => $pass];
}

function removeMySQLUserAndDatabase($user)
{
    exec('mysql -u '.$_SERVER['mysqluser'].' -p\''.$_SERVER['mysqlpassword'].'\' -e \'DROP DATABASE IF EXISTS '.$user.';\'', $output);
    exec('mysql -u '.$_SERVER['mysqluser'].' -p\''.$_SERVER['mysqlpassword'].'\' -e "DROP USER IF EXISTS \''.$user.'\'@\'localhost\';"', $output);
    exec('mysql -u '.$_SERVER['mysqluser'].' -p\''.$_SERVER['mysqlpassword'].'\' -e "FLUSH PRIVILEGES;"', $output);
    return;
}

function createUnixUserWithQuota($user, $quota)
{
    $pass = generatePassword();
    exec('useradd -m -p "'.$pass.'" '.$user, $output);
    exec('setquota -u '.$user.' '.$quota.' '.$quota.' 0 0 -a /dev/loop0', $output);
    // TODO : handle errors
    return ['user' => $user, 'password' => $pass, 'quota' => $quota];
}

function removeUnixUser($user)
{
    exec('deluser --remove-home '.$user, $output);
    // TODO : handle errors
    return;
}

function createNginxConfig($domain, $user, $herseUser, $hersePass)
{
    $nginxFile = '/etc/nginx/conf.d/'.$domain.'.conf';
    if (empty($herseUser) && empty($hersePass)) {
        // no herse needed
    } elseif (empty($herseUser) || empty($hersePass)) {
        throw new Exception('You need an username AND a password to add a herse.');
    } else {
        // add password file to domain
        file_put_contents(
            '/home'.'/'.$user.'/'.$domain.'/.htpasswd',
            $herseUser.':'.password_hash($hersePass, PASSWORD_BCRYPT)
        );
    }
    $subDomain = preg_match('/.'.$_SERVER['maindomain'].'$/isU', $domain, $matches, PREG_OFFSET_CAPTURE, 0);
    if (!$subDomain) {
        exec('/root/.acme.sh/acme.sh --issue -d '.$domain.' -d www.'.$domain.' -k ec-384 --nginx', $output);
        exec('mkdir -p /etc/letsencrypt/live/'.$domain, $output);
        exec('/root/.acme.sh/acme.sh --install-cert -d '.$domain.' --ecc \
        --cert-file /etc/letsencrypt/live/'.$domain.'/cert.pem \
        --key-file /etc/letsencrypt/live/'.$domain.'/key.pem \
        --fullchain-file /etc/letsencrypt/live/'.$domain.'/fullchain.pem \
        --ca-file /etc/letsencrypt/live/'.$domain.'/ca.pem \
        --reloadcmd "systemctl restart nginx.service"', $output);
    }
    $templates = new League\Plates\Engine(dirname(__FILE__).'/templates');
    file_put_contents(
        $nginxFile,
        $templates->render(
            'nginx-maindomain',
            [
                'domain' => $domain,
                'user' => $user,
                'herseUser' => $herseUser,
                'hersePass' => $hersePass,
                'subDomain' => $subDomain,
            ]
        )
    );
    exec('service nginx force-reload', $output);
}

function removeNginxConfig($domain)
{
    $nginxFile = '/etc/nginx/conf.d/'.$domain.'.conf';
    unlink($nginxFile);
    exec('service nginx force-reload', $output);
}

function createPhpFpmConfig($user)
{
    $phpVersion = str_replace(['php', '-fpm'], '', $_SERVER['phpservice']);
    $phpConfFile = '/etc/php/'.$phpVersion.'/fpm/pool.d/'.$user.'.conf';
    $templates = new League\Plates\Engine(dirname(__FILE__).'/templates');
    file_put_contents($phpConfFile, $templates->render('php-fpm', ['user' => $user]));
    exec('service '.$_SERVER['phpservice'].' reload', $output);
}

function removePhpFpmConfig($user)
{
    $phpVersion = str_replace(['php', '-fpm'], '', $_SERVER['phpservice']);
    $phpConfFile = '/etc/php/'.$phpVersion.'/fpm/pool.d/'.$user.'.conf';
    unlink($phpConfFile);
    exec('service '.$_SERVER['phpservice'].' reload', $output);
}

function copyYesWikiFiles($domain, $user)
{
    $destDir = '/home'.'/'.$user.'/'.$domain;
    exec('mkdir -p '.$destDir, $output);
    exec('mkdir -p '.$destDir.'/cache', $output);
    exec('mkdir -p '.$destDir.'/custom', $output);
    exec('mkdir -p '.$destDir.'/files', $output);
    exec('mkdir -p '.$destDir.'/files', $output);
    // TODO : handle errors
    return;
}

function checkHerse($herseUser, $hersePass)
{
    if (empty($herseUser) && empty($hersePass)) {
        return false; // no herse needed
    } elseif (empty($herseUser) || empty($hersePass)) {
        throw new Exception('You need an username AND a password to add a herse.');
    }
    return true; // herse needed
}