<?php

/**
 * @file include/account.php
 * @brief Some account related functions.
 */

use Zotlabs\Lib\Crypto;
use Zotlabs\Lib\System;

function get_account_by_id($account_id)
{
    $r = q(
        "select * from account where account_id = %d",
        intval($account_id)
    );
    return (($r) ? array_shift($r) : false);
}

function check_account_email($email)
{

    $email = punify($email);
    $result = [ 'error' => false, 'message' => '' ];

    // Caution: empty email isn't counted as an error in this function.
    // Check for empty value separately.

    if (! strlen($email)) {
        return $result;
    }

    if (! validate_email($email)) {
        $result['message'] .= t('Not a valid email address') . EOL;
    } elseif (! allowed_email($email)) {
        $result['message'] = t('Your email domain is not among those allowed on this site');
    } else {
        $r = q(
            "select account_email from account where account_email = '%s' limit 1",
            dbesc($email)
        );
        if ($r) {
            $result['message'] .= t('Your email address is already registered at this site.');
        }
    }
    if ($result['message']) {
        $result['error'] = true;
    }

    $arr = array('email' => $email, 'result' => $result);
    call_hooks('check_account_email', $arr);

    return $arr['result'];
}

function check_account_password($password)
{
    $result = [ 'error' => false, 'message' => '' ];

    // The only validation we perform by default is pure Javascript to
    // check minimum length and that both entered passwords match.
    // Use hooked functions to perform complexity requirement checks.

    $arr = [ 'password' => $password, 'result' => $result ];
    call_hooks('check_account_password', $arr);

    return $arr['result'];
}

function check_account_invite($invite_code)
{
    $result = [ 'error' => false, 'message' => '' ];

    $using_invites = get_config('system', 'invitation_only');

    if ($using_invites && defined('INVITE_WORKING')) {
        if (! $invite_code) {
            $result['message'] .= t('An invitation is required.') . EOL;
        }
        $r = q("select * from register where hash = '%s' limit 1", dbesc($invite_code));
        if (! $r) {
            $result['message'] .= t('Invitation could not be verified.') . EOL;
        }
    }
    if (strlen($result['message'])) {
        $result['error'] = true;
    }

    $arr = [ 'invite_code' => $invite_code, 'result' => $result ];
    call_hooks('check_account_invite', $arr);

    return $arr['result'];
}

function check_account_admin($arr)
{
    if (is_site_admin()) {
        return true;
    }
    $admin_email = trim(get_config('system', 'admin_email', ''));
    if (strlen($admin_email) && $admin_email === trim($arr['email'])) {
        return true;
    }
    return false;
}

function account_total()
{
    $r = q("select account_id from account where true");
    // Distinguish between an empty array and an error
    if (is_array($r)) {
        return count($r);
    }
    return false;
}


function account_store_lowlevel($arr)
{

    $store = [
        'account_parent'           => ((array_key_exists('account_parent', $arr))           ? $arr['account_parent']           : '0'),
        'account_default_channel'  => ((array_key_exists('account_default_channel', $arr))  ? $arr['account_default_channel']  : '0'),
        'account_salt'             => ((array_key_exists('account_salt', $arr))             ? $arr['account_salt']             : ''),
        'account_password'         => ((array_key_exists('account_password', $arr))         ? $arr['account_password']         : ''),
        'account_email'            => ((array_key_exists('account_email', $arr))            ? $arr['account_email']            : ''),
        'account_external'         => ((array_key_exists('account_external', $arr))         ? $arr['account_external']         : ''),
        'account_language'         => ((array_key_exists('account_language', $arr))         ? $arr['account_language']         : 'en'),
        'account_created'          => ((array_key_exists('account_created', $arr))          ? $arr['account_created']          : '0001-01-01 00:00:00'),
        'account_lastlog'          => ((array_key_exists('account_lastlog', $arr))          ? $arr['account_lastlog']          : '0001-01-01 00:00:00'),
        'account_flags'            => ((array_key_exists('account_flags', $arr))            ? $arr['account_flags']            : '0'),
        'account_roles'            => ((array_key_exists('account_roles', $arr))            ? $arr['account_roles']            : '0'),
        'account_reset'            => ((array_key_exists('account_reset', $arr))            ? $arr['account_reset']            : ''),
        'account_expires'          => ((array_key_exists('account_expires', $arr))          ? $arr['account_expires']          : '0001-01-01 00:00:00'),
        'account_expire_notified'  => ((array_key_exists('account_expire_notified', $arr))  ? $arr['account_expire_notified']  : '0001-01-01 00:00:00'),
        'account_service_class'    => ((array_key_exists('account_service_class', $arr))    ? $arr['account_service_class']    : ''),
        'account_level'            => ((array_key_exists('account_level', $arr))            ? $arr['account_level']            : '0'),
        'account_password_changed' => ((array_key_exists('account_password_changed', $arr)) ? $arr['account_password_changed'] : '0001-01-01 00:00:00')
    ];

    return create_table_from_array('account', $store);
}


function create_account($arr)
{

    // Required: { email, password }

    $result = [ 'success' => false, 'email' => '', 'password' => '', 'message' => '' ];

    $invite_code = ((isset($arr['invite_code']))   ? notags(trim($arr['invite_code']))  : '');
    $email       = ((isset($arr['email']))         ? notags(punify(trim($arr['email']))) : '');
    $password    = ((isset($arr['password']))      ? trim($arr['password'])             : '');
    $password2   = ((isset($arr['password2']))     ? trim($arr['password2'])            : '');
    $parent      = ((isset($arr['parent']))        ? intval($arr['parent'])             : 0 );
    $flags       = ((isset($arr['account_flags'])) ? intval($arr['account_flags'])      : ACCOUNT_OK);
    $roles       = ((isset($arr['account_roles'])) ? intval($arr['account_roles'])      : 0 );
    $expires     = ((isset($arr['expires']))       ? intval($arr['expires'])            : NULL_DATE);

    $default_service_class = get_config('system', 'default_service_class', EMPTY_STR);

    if (! ($email && $password)) {
        $result['message'] = t('Please enter the required information.');
        return $result;
    }

    // prevent form hackery

    if (($roles & ACCOUNT_ROLE_ADMIN) && (! check_account_admin($arr))) {
        $roles = $roles - ACCOUNT_ROLE_ADMIN;
    }

    // allow the admin_email account to be admin, but only if it's the first account.

    $c = account_total();
    if (($c === 0) && (check_account_admin($arr))) {
        $roles |= ACCOUNT_ROLE_ADMIN;
    }

    // Ensure that there is a host keypair.

    if ((! get_config('system', 'pubkey')) && (! get_config('system', 'prvkey'))) {
        $hostkey = Crypto::new_keypair(4096);
        set_config('system', 'pubkey', $hostkey['pubkey']);
        set_config('system', 'prvkey', $hostkey['prvkey']);
    }

    $invite_result = check_account_invite($invite_code);
    if ($invite_result['error']) {
        $result['message'] = $invite_result['message'];
        return $result;
    }

    $email_result = check_account_email($email);

    if ($email_result['error']) {
        $result['message'] = $email_result['message'];
        return $result;
    }

    $password_result = check_account_password($password);

    if ($password_result['error']) {
        $result['message'] = $password_result['message'];
        return $result;
    }

    $salt = random_string(32);
    $password_encoded = hash('whirlpool', $salt . $password);

    $r = account_store_lowlevel(
        [
            'account_parent'        => intval($parent),
            'account_salt'          => $salt,
            'account_password'      => $password_encoded,
            'account_email'         => $email,
            'account_language'      => get_best_language(),
            'account_created'       => datetime_convert(),
            'account_flags'         => intval($flags),
            'account_roles'         => intval($roles),
            'account_expires'       => $expires,
            'account_service_class' => $default_service_class
        ]
    );
    if (! $r) {
        logger('create_account: DB INSERT failed.');
        $result['message'] = t('Failed to store account information.');
        return($result);
    }

    $r = q(
        "select * from account where account_email = '%s' and account_password = '%s' limit 1",
        dbesc($email),
        dbesc($password_encoded)
    );
    if ($r && is_array($r) && count($r)) {
        $result['account'] = $r[0];
    } else {
        logger('create_account: could not retrieve newly created account');
    }

    // Set the parent record to the current record_id if no parent was provided

    if (! $parent) {
        $r = q(
            "update account set account_parent = %d where account_id = %d",
            intval($result['account']['account_id']),
            intval($result['account']['account_id'])
        );
        if (! $r) {
            logger('create_account: failed to set parent');
        }
        $result['account']['parent'] = $result['account']['account_id'];
    }

    $result['success']  = true;
    $result['email']    = $email;
    $result['password'] = $password;

    call_hooks('register_account', $result);

    return $result;
}


function verify_email_address($arr)
{

    if (array_key_exists('resend', $arr)) {
        $email = $arr['email'];
        $a = q(
            "select * from account where account_email = '%s' limit 1",
            dbesc($arr['email'])
        );
        if (! ($a && ($a[0]['account_flags'] & ACCOUNT_UNVERIFIED))) {
            return false;
        }
        $account = array_shift($a);
        $v = q(
            "select * from register where uid = %d and password = 'verify' limit 1",
            intval($account['account_id'])
        );
        if ($v) {
            $hash = $v[0]['hash'];
        } else {
            return false;
        }
    } else {
        $hash = random_string(24);

        $r = q(
            "INSERT INTO register ( hash, created, uid, password, lang ) VALUES ( '%s', '%s', %d, '%s', '%s' ) ",
            dbesc($hash),
            dbesc(datetime_convert()),
            intval($arr['account']['account_id']),
            dbesc('verify'),
            dbesc($arr['account']['account_language'])
        );
        $account = $arr['account'];
    }

    push_lang(($account['account_language']) ? $account['account_language'] : 'en');

    $email_msg = replace_macros(
        get_intltext_template('register_verify_member.tpl'),
        [
            '$sitename' => System::get_site_name(),
            '$siteurl'  => z_root(),
            '$email'    => $arr['email'],
            '$uid'      => $account['account_id'],
            '$hash'     => $hash,
            '$details'  => $details
        ]
    );

    $res = z_mail(
        [
        'toEmail' => $arr['email'],
        'messageSubject' => sprintf(t('Registration confirmation for %s'), System::get_site_name()),
        'textVersion' => $email_msg,
        ]
    );

    pop_lang();

    if ($res) {
        $delivered ++;
    } else {
        logger('send_reg_approval_email: failed to account_id: ' . $arr['account']['account_id']);
    }
    return $res;
}


function send_reg_approval_email($arr)
{

    $r = q(
        "select * from account where (account_roles & %d) >= 4096",
        intval(ACCOUNT_ROLE_ADMIN)
    );
    if (! ($r && is_array($r) && count($r))) {
        return false;
    }

    $admins = [];

    foreach ($r as $rr) {
        if (strlen($rr['account_email'])) {
            $admins[] = [ 'email' => $rr['account_email'], 'lang' => $rr['account_lang'] ];
        }
    }

    if (! count($admins)) {
        return false;
    }

    $hash = random_string();

    $r = q(
        "INSERT INTO register ( hash, created, uid, password, lang ) VALUES ( '%s', '%s', %d, '%s', '%s' ) ",
        dbesc($hash),
        dbesc(datetime_convert()),
        intval($arr['account']['account_id']),
        dbesc(''),
        dbesc($arr['account']['account_language'])
    );

    $ip = ((isset($_SERVER['REMOTE_ADDR'])) ? $_SERVER['REMOTE_ADDR'] : EMPTY_STR);

    $details = (($ip) ? $ip . ' [' . gethostbyaddr($ip) . ']' : '[unknown or stealth IP]');

    $delivered = 0;

    foreach ($admins as $admin) {
        if (strlen($admin['lang'])) {
            push_lang($admin['lang']);
        } else {
            push_lang('en');
        }

        $email_msg = replace_macros(get_intltext_template('register_verify_eml.tpl'), [
            '$sitename' => get_config('system', 'sitename'),
            '$siteurl'  =>  z_root(),
            '$email'    => $arr['email'],
            '$uid'      => $arr['account']['account_id'],
            '$hash'     => $hash,
            '$details'  => $details
         ]);

        $res = z_mail(
            [
            'toEmail' => $admin['email'],
            'messageSubject' => sprintf(t('Registration request at %s'), get_config('system', 'sitename')),
            'textVersion' => $email_msg,
            ]
        );

        if ($res) {
            $delivered ++;
        } else {
            logger('send_reg_approval_email: failed to ' . $admin['email'] . 'account_id: ' . $arr['account']['account_id']);
        }
        
        pop_lang();
    }

    return ($delivered ? true : false);
}

function send_register_success_email($email, $password)
{

    $email_msg = replace_macros(get_intltext_template('register_open_eml.tpl'), [
        '$sitename' => System::get_site_name(),
        '$siteurl' =>  z_root(),
        '$email'    => $email,
        '$password' => t('your registration password'),
    ]);

    $res = z_mail(
        [
            'toEmail' => $email,
            'messageSubject' => sprintf(t('Registration details for %s'), System::get_site_name()),
            'textVersion' => $email_msg,
        ]
    );

    return ($res ? true : false);
}

/**
 * @brief Allows a user registration.
 *
 * @param string $hash
 * @return array|bool
 */
function account_allow($hash)
{

    $ret = array('success' => false);

    $register = q(
        "SELECT * FROM register WHERE hash = '%s' LIMIT 1",
        dbesc($hash)
    );

    if (! $register) {
        return $ret;
    }

    $account = q(
        "SELECT * FROM account WHERE account_id = %d LIMIT 1",
        intval($register[0]['uid'])
    );

    if (! $account) {
        return $ret;
    }

    $r = q(
        "DELETE FROM register WHERE hash = '%s'",
        dbesc($register[0]['hash'])
    );

    $r = q(
        "update account set account_flags = (account_flags & ~%d) where (account_flags & %d) > 0 and account_id = %d",
        intval(ACCOUNT_BLOCKED),
        intval(ACCOUNT_BLOCKED),
        intval($register[0]['uid'])
    );
    $r = q(
        "update account set account_flags = (account_flags & ~%d) where (account_flags & %d) > 0 and account_id = %d",
        intval(ACCOUNT_PENDING),
        intval(ACCOUNT_PENDING),
        intval($register[0]['uid'])
    );

    push_lang($register[0]['lang']);

    $email_tpl = get_intltext_template("register_open_eml.tpl");
    $email_msg = replace_macros($email_tpl, [
        '$sitename' => System::get_site_name(),
        '$siteurl'  =>  z_root(),
        '$username' => $account[0]['account_email'],
        '$email'    => $account[0]['account_email'],
        '$password' => '',
        '$uid'      => $account[0]['account_id']
    ]);

    $res = z_mail(
        [
        'toEmail' => $account[0]['account_email'],
        'messageSubject' => sprintf(t('Registration details for %s'), System::get_site_name()),
        'textVersion' => $email_msg,
        ]
    );

    pop_lang();

    if (get_config('system', 'auto_channel_create')) {
        auto_channel_create($register[0]['uid']);
    }

    if ($res) {
        info(t('Account approved.') . EOL);
        return true;
    }
}


/**
 * @brief Denies an account registration.
 *
 * This does not have to go through user_remove() and save the nickname
 * permanently against re-registration, as the person was not yet
 * allowed to have friends on this system
 *
 * @param string $hash
 * @return bool
 */

function account_deny($hash)
{

    $register = q(
        "SELECT * FROM register WHERE hash = '%s' LIMIT 1",
        dbesc($hash)
    );

    if (! $register) {
        return false;
    }

    $account = q(
        "SELECT account_id, account_email FROM account WHERE account_id = %d LIMIT 1",
        intval($register[0]['uid'])
    );

    if (! $account) {
        return false;
    }

    $r = q(
        "DELETE FROM account WHERE account_id = %d",
        intval($register[0]['uid'])
    );

    $r = q(
        "DELETE FROM register WHERE id = %d",
        intval($register[0]['id'])
    );
    notice(sprintf(t('Registration revoked for %s'), $account[0]['account_email']) . EOL);

    return true;
}

// called from regver to activate an account from the email verification link

function account_approve($hash)
{

    $ret = false;

    // Note: when the password in the register table is 'verify', the uid actually contains the account_id

    $register = q(
        "SELECT * FROM register WHERE hash = '%s' and password = 'verify' LIMIT 1",
        dbesc($hash)
    );

    if (! $register) {
        return $ret;
    }

    $account = q(
        "SELECT * FROM account WHERE account_id = %d LIMIT 1",
        intval($register[0]['uid'])
    );

    if (! $account) {
        return $ret;
    }

    $r = q(
        "DELETE FROM register WHERE hash = '%s' and password = 'verify'",
        dbesc($register[0]['hash'])
    );

    $r = q(
        "update account set account_flags = (account_flags & ~%d) where (account_flags & %d)>0 and account_id = %d",
        intval(ACCOUNT_BLOCKED),
        intval(ACCOUNT_BLOCKED),
        intval($register[0]['uid'])
    );
    $r = q(
        "update account set account_flags = (account_flags & ~%d) where (account_flags & %d)>0 and account_id = %d",
        intval(ACCOUNT_PENDING),
        intval(ACCOUNT_PENDING),
        intval($register[0]['uid'])
    );
    $r = q(
        "update account set account_flags = (account_flags & ~%d) where (account_flags & %d)>0 and account_id = %d",
        intval(ACCOUNT_UNVERIFIED),
        intval(ACCOUNT_UNVERIFIED),
        intval($register[0]['uid'])
    );

    // get a fresh copy after we've modified it.

    $account = q(
        "SELECT * FROM account WHERE account_id = %d LIMIT 1",
        intval($register[0]['uid'])
    );

    if (! $account) {
        return $ret;
    }

    if (get_config('system', 'auto_channel_create')) {
        auto_channel_create($register[0]['uid']);
    } else {
        $_SESSION['login_return_url'] = 'new_channel';
        authenticate_success($account[0], null, true, true, false, true);
    }

    return true;
}


/**
 * @brief Checks for accounts that have past their expiration date.
 *
 * If the account has a service class which is not the site default,
 * the service class is reset to the site default and expiration reset to never.
 * If the account has no service class it is expired and subsequently disabled.
 * called from include/poller.php as a scheduled task.
 *
 * Reclaiming resources which are no longer within the service class limits is
 * not the job of this function, but this can be implemented by plugin if desired.
 * Default behaviour is to stop allowing additional resources to be consumed.
 */
function downgrade_accounts()
{

    $r = q(
        "select * from account where not ( account_flags & %d ) > 0 
		and account_expires > '%s' 
		and account_expires < %s ",
        intval(ACCOUNT_EXPIRED),
        dbesc(NULL_DATE),
        db_getfunc('UTC_TIMESTAMP')
    );

    if (! $r) {
        return;
    }

    $basic = get_config('system', 'default_service_class');

    foreach ($r as $rr) {
        if (($basic) && ($rr['account_service_class']) && ($rr['account_service_class'] != $basic)) {
            $x = q(
                "UPDATE account set account_service_class = '%s', account_expires = '%s'
				where account_id = %d",
                dbesc($basic),
                dbesc(NULL_DATE),
                intval($rr['account_id'])
            );
            $ret = [ 'account' => $rr ];
            call_hooks('account_downgrade', $ret);
            logger('downgrade_accounts: Account id ' . $rr['account_id'] . ' downgraded.');
        } else {
            $x = q(
                "UPDATE account SET account_flags = (account_flags | %d) where account_id = %d",
                intval(ACCOUNT_EXPIRED),
                intval($rr['account_id'])
            );
            $ret = [ 'account' => $rr ];
            call_hooks('account_downgrade', $ret);
            logger('downgrade_accounts: Account id ' . $rr['account_id'] . ' expired.');
        }
    }
}


/**
 * @brief Check service_class restrictions.
 *
 * If there are no service_classes defined, everything is allowed.
 * If $usage is supplied, we check against a maximum count and return true if
 * the current usage is less than the subscriber plan allows. Otherwise we
 * return boolean true or false if the property is allowed (or not) in this
 * subscriber plan. An unset property for this service plan means the property
 * is allowed, so it is only necessary to provide negative properties for each
 * plan, or what the subscriber is not allowed to do.
 *
 * Like account_service_class_allows() but queries directly by account rather
 * than channel. Service classes are set for accounts, so we look up the
 * account for the channel and fetch the service class restrictions of the
 * account.
 *
 * @see account_service_class_allows() if you have a channel_id already
 * @see service_class_fetch()
 *
 * @param int $uid The channel_id to check
 * @param string $property The service class property to check for
 * @param string|bool $usage (optional) The value to check against
 * @return bool
 */
function service_class_allows($uid, $property, $usage = false)
{
    $limit = service_class_fetch($uid, $property);

    if ($limit === false) {
        return true; // No service class set => everything is allowed
    }
    
    $limit = engr_units_to_bytes($limit);
    if ($usage === false) {
        // We use negative values for not allowed properties in a subscriber plan
        return (($limit) ? (bool) $limit : true);
    } else {
        return (((intval($usage)) < intval($limit)) ? true : false);
    }
}

/**
 * @brief Check service class restrictions by account.
 *
 * If there are no service_classes defined, everything is allowed.
 * If $usage is supplied, we check against a maximum count and return true if
 * the current usage is less than the subscriber plan allows. Otherwise we
 * return boolean true or false if the property is allowed (or not) in this
 * subscriber plan. An unset property for this service plan means the property
 * is allowed, so it is only necessary to provide negative properties for each
 * plan, or what the subscriber is not allowed to do.
 *
 * Like service_class_allows() but queries directly by account rather than channel.
 *
 * @see service_class_allows() if you have a channel_id instead of an account_id
 * @see account_service_class_fetch()
 *
 * @param int $aid The account_id to check
 * @param string $property The service class property to check for
 * @param int|bool $usage (optional) The value to check against
 * @return bool
 */
function account_service_class_allows($aid, $property, $usage = false)
{

    $limit = account_service_class_fetch($aid, $property);

    if ($limit === false) {
        return true; // No service class is set => everything is allowed
    }
    
    $limit = engr_units_to_bytes($limit);

    if ($usage === false) {
        // We use negative values for not allowed properties in a subscriber plan
        return (($limit) ? (bool) $limit : true);
    } else {
        return (((intval($usage)) < intval($limit)) ? true : false);
    }
}

/**
 * @brief Queries a service class value for a channel and property.
 *
 * Service classes are set for accounts, so look up the account for this channel
 * and fetch the service classe of the account.
 *
 * If no service class is available it returns false and everything should be
 * allowed.
 *
 * @see account_service_class_fetch()
 *
 * @param int $uid The channel_id to query
 * @param string $property The service property name to check for
 * @return bool|int
 *
 * @todo Should we merge this with account_service_class_fetch()?
 */
function service_class_fetch($uid, $property)
{


    if ($uid == local_channel()) {
        $service_class = App::$account['account_service_class'];
    } else {
        $r = q(
            "select account_service_class 
			from channel c, account a 
			where c.channel_account_id = a.account_id and c.channel_id = %d limit 1",
            intval($uid)
        );
        if ($r) {
            $service_class = $r[0]['account_service_class'];
        }
    }
    if (! $service_class) {
        return false; // everything is allowed
    }
    $arr = get_config('service_class', $service_class);

    if (! is_array($arr) || (! count($arr))) {
        return false;
    }

    return((array_key_exists($property, $arr)) ? $arr[$property] : false);
}

/**
 * @brief Queries a service class value for an account and property.
 *
 * Like service_class_fetch() but queries by account rather than channel.
 *
 * @see service_class_fetch() if you have channel_id.
 * @see account_service_class_allows()
 *
 * @param int $aid The account_id to query
 * @param string $property The service property name to check for
 * @return bool|int
 */
function account_service_class_fetch($aid, $property)
{

    $r = q(
        "select account_service_class as service_class from account where account_id = %d limit 1",
        intval($aid)
    );
    if ($r !== false && count($r)) {
        $service_class = $r[0]['service_class'];
    }

    if (! x($service_class)) {
        return false; // everything is allowed
    }

    $arr = get_config('service_class', $service_class);

    if (! is_array($arr) || (! count($arr))) {
        return false;
    }

    return((array_key_exists($property, $arr)) ? $arr[$property] : false);
}


function upgrade_link($bbcode = false)
{
    $l = get_config('service_class', 'upgrade_link');
    if (! $l) {
        return '';
    }
    if ($bbcode) {
        $t = sprintf('[zrl=%s]' . t('Click here to upgrade.') . '[/zrl]', $l);
    } else {
        $t = sprintf('<a href="%s">' . t('Click here to upgrade.') . '</div>', $l);
    }
    return $t;
}

function upgrade_message($bbcode = false)
{
    $x = upgrade_link($bbcode);
    return t('This action exceeds the limits set by your subscription plan.') . (($x) ? ' ' . $x : '') ;
}

function upgrade_bool_message($bbcode = false)
{
    $x = upgrade_link($bbcode);
    return t('This action is not available under your subscription plan.') . (($x) ? ' ' . $x : '') ;
}