<?php
// Mail configuration sourced from DB settings with environment variables fallback.

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

$db_settings = [];
if (file_exists(__DIR__ . '/../db/config.php')) {
    try {
        require_once __DIR__ . '/../db/config.php';
        if (function_exists('db')) {
            $pdo = db();
            if ($pdo) {
                $stmt = $pdo->query("SELECT setting_key, setting_value FROM settings WHERE setting_key IN ('smtp_host', 'smtp_port', 'smtp_user', 'smtp_pass', 'smtp_secure', 'mail_from', 'mail_from_name')");
                while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
                    $db_settings[$row['setting_key']] = $row['setting_value'];
                }
            }
        }
    } catch (\Throwable $e) {
        // ignore DB errors during config loading
    }
}

// Function to get config value with fallback
function get_cfg($db_settings, $key, $env_key, $default = null, $allow_empty = false) {
    if (isset($db_settings[$key])) {
        if ($allow_empty || $db_settings[$key] !== '') {
            return $db_settings[$key];
        }
    }
    return env_val($env_key, $default);
}

$transport   = env_val('MAIL_TRANSPORT', 'smtp');
$smtp_host   = get_cfg($db_settings, 'smtp_host', 'SMTP_HOST');
$smtp_port   = (int) get_cfg($db_settings, 'smtp_port', 'SMTP_PORT', 587);
$smtp_secure = get_cfg($db_settings, 'smtp_secure', 'SMTP_SECURE', 'tls', true);
$smtp_user   = get_cfg($db_settings, 'smtp_user', 'SMTP_USER');
$smtp_pass   = get_cfg($db_settings, 'smtp_pass', 'SMTP_PASS', null, true);

$from_email  = get_cfg($db_settings, 'mail_from', 'MAIL_FROM', 'no-reply@localhost');
$from_name   = get_cfg($db_settings, 'mail_from_name', '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
    'smtp_host'   => $smtp_host,
    'smtp_port'   => $smtp_port,
    'smtp_secure' => $smtp_secure,
    'smtp_user'   => $smtp_user,
    'smtp_pass'   => $smtp_pass,

    // From / Reply-To
    'from_email'  => $from_email,
    'from_name'   => $from_name,
    'reply_to'    => $reply_to,

    // DKIM (optional)
    'dkim_domain'           => $dkim_domain,
    'dkim_selector'         => $dkim_selector,
    'dkim_private_key_path' => $dkim_private_key_path,
];