<?php
// Mail configuration sourced from environment variables or Database.

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

// Fallback: if critical vars are missing from process env, try to parse executor/.env
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'
]);

// Try to load from Database
$dbSettings = [];
try {
    require_once __DIR__ . '/../db/config.php';
    $pdo = db();
    $stmt = $pdo->prepare("SELECT setting_key, setting_value FROM integration_settings WHERE provider = 'smtp'");
    $stmt->execute();
    $rows = $stmt->fetchAll(PDO::FETCH_ASSOC);
    foreach ($rows as $row) {
        $dbSettings[$row['setting_key']] = $row['setting_value'];
    }
} catch (Exception $e) {
    // Database might not be ready or table might not exist yet
}

$transport   = $dbSettings['transport'] ?? env_val('MAIL_TRANSPORT', 'smtp');
$smtp_host   = $dbSettings['host'] ?? env_val('SMTP_HOST');
$smtp_port   = (int) ($dbSettings['port'] ?? env_val('SMTP_PORT', 587));
$smtp_secure = $dbSettings['secure'] ?? env_val('SMTP_SECURE', 'tls'); 
$smtp_user   = $dbSettings['username'] ?? env_val('SMTP_USER');
$smtp_pass   = $dbSettings['password'] ?? env_val('SMTP_PASS');

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

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,
];