<?php
/**
 * generate_mock_data.php
 * Standalone JWT generator — ZERO external dependencies.
 * Generates HS256 JWT using pure PHP (no composer/vendor needed).
 */

// Show errors so we can debug
error_reporting(E_ALL);
ini_set('display_errors', '1');

// ── Load .env ──
$loadedFiles = [];
function loadEnvFile(string $path): void {
    global $loadedFiles;
    if (!file_exists($path)) {
        $loadedFiles[] = "NOT_FOUND: $path";
        return;
    }
    $loadedFiles[] = "LOADED: $path";
    foreach (file($path, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES) as $line) {
        $line = trim($line);
        if (empty($line) || $line[0] === '#' || strpos($line, '=') === false) continue;
        [$name, $value] = explode('=', $line, 2);
        putenv(trim($name) . '=' . trim($value, "\"'"));
        $_ENV[trim($name)] = trim($value, "\"'");
    }
}

// Try multiple .env locations
loadEnvFile('/home/location/env/.env');
loadEnvFile(dirname(__DIR__) . '/backend/.env');

// ── Resolve JWT secret ──
function getJwtSecret(): string {
    // Priority 1: key file
    $keyPath = getenv('JWT_SECRET_KEY_PATH');
    if ($keyPath && file_exists($keyPath)) {
        return trim(file_get_contents($keyPath));
    }
    // Priority 2: JWT_SECRET_KEY env var
    $key = getenv('JWT_SECRET_KEY') ?: ($_ENV['JWT_SECRET_KEY'] ?? '');
    if ($key) return $key;
    // Priority 3: JWT_SECRET env var (backend .env uses this)
    $key = getenv('JWT_SECRET') ?: ($_ENV['JWT_SECRET'] ?? '');
    if ($key) return $key;
    return '';
}

// ── Pure PHP HS256 JWT (no libraries needed) ──
function base64url_encode(string $data): string {
    return rtrim(strtr(base64_encode($data), '+/', '-_'), '=');
}

function generate_jwt(string $secret, array $payload): string {
    $header = base64url_encode(json_encode(['alg' => 'HS256', 'typ' => 'JWT']));
    $body   = base64url_encode(json_encode($payload));
    $sig    = base64url_encode(hash_hmac('sha256', "$header.$body", $secret, true));
    return "$header.$body.$sig";
}

// ── Main ──
$secret = getJwtSecret();
if (empty($secret)) {
    echo json_encode(['error' => 'JWT secret not found in any .env', 'files_checked' => $loadedFiles, 'jwt' => '']);
    // Do not exit with 1 so Node.js can print the JSON error
    exit(0);
}

$driverId = $argv[1] ?? '999999';

$jwt = generate_jwt($secret, [
    'sub'  => (string)$driverId,
    'role' => 'driver',
    'iat'  => time(),
    'exp'  => time() + 86400,
]);

echo json_encode(['driver_id' => $driverId, 'jwt' => $jwt]);