<?php
// Mail configuration sourced from environment variables,
// falling back to database settings if configured.

function env_val(string $key, $default = null) {
    $v = getenv($key);
    return ($v === false || $v === null || $v === '') ? $default : $v;
}

function load_dotenv_if_needed(array $keys): void {
    $missing = array_filter($keys, fn($k) => getenv($k) === false || getenv($k) === '');
    if (empty($missing)) return;
    static $loaded = false;
    if ($loaded) return;
    $envPath = realpath(__DIR__ . '/../../.env'); // executor/.env
    if ($envPath && is_readable($envPath)) {
        $lines = @file($envPath, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES) ?: [];
        foreach ($lines as $line) {
            if ($line[0] === '#' || trim($line) === '') continue;
            if (!str_contains($line, '=')) continue;
            [$k, $v] = array_map('trim', explode('=', $line, 2));
            $v = trim($v, "'\" ");
            if ($k !== '' && (getenv($k) === false || getenv($k) === '')) {
                putenv("{$k}={$v}");
            }
        }
        $loaded = true;
    }
}

load_dotenv_if_needed([
    'MAIL_TRANSPORT','SMTP_HOST','SMTP_PORT','SMTP_SECURE','SMTP_USER','SMTP_PASS',
    'MAIL_FROM','MAIL_FROM_NAME','MAIL_REPLY_TO','MAIL_TO',
    'DKIM_DOMAIN','DKIM_SELECTOR','DKIM_PRIVATE_KEY_PATH'
]);

// Attempt to load settings from DB safely
function get_mail_db_settings(): array {
    $settings = [];
    $dbPath = __DIR__ . '/../db/config.php';
    if (file_exists($dbPath)) {
        require_once $dbPath;
        if (function_exists('db')) {
            try {
                $stmt = db()->query("SELECT setting_key, setting_value FROM settings");
                while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
                    $settings[$row['setting_key']] = $row['setting_value'];
                }
            } catch (Throwable $e) {
                // Ignore DB errors if not initialized
            }
        }
    }
    return $settings;
}

$dbSettings = get_mail_db_settings();

$transport   = env_val('MAIL_TRANSPORT', 'smtp');

$smtp_host   = !empty($dbSettings['smtp_host']) ? $dbSettings['smtp_host'] : env_val('SMTP_HOST');
$smtp_port   = !empty($dbSettings['smtp_port']) ? (int)$dbSettings['smtp_port'] : (int) env_val('SMTP_PORT', 587);
$smtp_secure = isset($dbSettings['smtp_secure']) && $dbSettings['smtp_secure'] !== '' ? $dbSettings['smtp_secure'] : env_val('SMTP_SECURE', 'tls');
if (isset($dbSettings['smtp_secure']) && $dbSettings['smtp_secure'] === 'none') {
    $smtp_secure = '';
}
if ($smtp_secure === 'none') $smtp_secure = ''; // Normalize None to empty for PHPMailer

$smtp_user   = !empty($dbSettings['smtp_user']) ? $dbSettings['smtp_user'] : env_val('SMTP_USER');
$smtp_pass   = !empty($dbSettings['smtp_pass']) ? $dbSettings['smtp_pass'] : env_val('SMTP_PASS');

$from_email  = !empty($dbSettings['mail_from']) ? $dbSettings['mail_from'] : env_val('MAIL_FROM', 'no-reply@localhost');
$from_name   = !empty($dbSettings['mail_from_name']) ? $dbSettings['mail_from_name'] : env_val('MAIL_FROM_NAME', 'App');
$reply_to    = env_val('MAIL_REPLY_TO');

$dkim_domain           = env_val('DKIM_DOMAIN');
$dkim_selector         = env_val('DKIM_SELECTOR');
$dkim_private_key_path = env_val('DKIM_PRIVATE_KEY_PATH');

return [
    'transport'   => $transport,
    'smtp_host'   => $smtp_host,
    'smtp_port'   => $smtp_port,
    'smtp_secure' => $smtp_secure,
    'smtp_user'   => $smtp_user,
    'smtp_pass'   => $smtp_pass,
    'from_email'  => $from_email,
    'from_name'   => $from_name,
    'reply_to'    => $reply_to,
    'dkim_domain'           => $dkim_domain,
    'dkim_selector'         => $dkim_selector,
    'dkim_private_key_path' => $dkim_private_key_path,
];