#!/usr/local/bin/php
<?php
declare(strict_types=1);

define('PLUGIN_ROOT', dirname(__DIR__));
define('PLUGIN_EXEC_DIR', PLUGIN_ROOT . '/exec');

foreach ([
    'Settings.php',
    'RuleRepository.php',
    'DirectAdminSyncRepository.php',
    'MailboxDirectory.php',
    'DirectAdminVacationApi.php',
    'DirectAdminVacationSyncService.php',
] as $file) {
    require_once PLUGIN_EXEC_DIR . '/lib/' . $file;
}

function sync_usage(): void
{
    fwrite(STDERR, "Usage: sync_directadmin_vacations.php [--user=USERNAME]\n");
}

try {
    $targetUser = '';
    foreach (array_slice($_SERVER['argv'] ?? [], 1) as $arg) {
        if (str_starts_with($arg, '--user=')) {
            $targetUser = substr($arg, 7);
            continue;
        }
        sync_usage();
        exit(2);
    }
    if ($targetUser === '') {
        $targetUser = getenv('USERNAME') ?: getenv('USER') ?: '';
    }
    if ($targetUser !== '' && !preg_match('/^[A-Za-z0-9._-]+$/', $targetUser)) {
        throw new InvalidArgumentException('Invalid username');
    }

    $settings = Settings::load(Settings::EXTERNAL_SETTINGS);
    if ($settings->backendMode() !== 'da') {
        echo "DirectAdmin backend is not active; nothing to sync.\n";
        exit(0);
    }

    $users = $targetUser !== '' ? [$targetUser] : users_with_rules(Settings::DATA_DIR);
    $service = new DirectAdminVacationSyncService(
        new RuleRepository(),
        new DirectAdminSyncRepository(),
        new MailboxDirectory(),
        new DirectAdminVacationApi()
    );
    foreach ($users as $username) {
        $service->syncUser($username);
        echo "Synced {$username}\n";
    }
    exit(0);
} catch (Throwable $e) {
    fwrite(STDERR, "DirectAdmin vacation synchronization failed: " . $e->getMessage() . "\n");
    exit(1);
}

/** @return string[] */
function users_with_rules(string $baseDir): array
{
    $dir = rtrim($baseDir, '/') . '/users';
    if (!is_dir($dir)) {
        return [];
    }
    $users = [];
    foreach (scandir($dir) ?: [] as $entry) {
        if ($entry === '.' || $entry === '..' || !preg_match('/^[A-Za-z0-9._-]+$/', $entry)) {
            continue;
        }
        if (is_file($dir . '/' . $entry . '/rules.json')) {
            $users[] = $entry;
        }
    }
    sort($users);
    return $users;
}