<?php
// Root router — serve frontend or API
// Works at web root or in a subdirectory (e.g. /protocol-droid/)

// Detect the base path (for subdirectory deployments)
$scriptName = $_SERVER['SCRIPT_NAME'] ?? '/index.php';
$basePath = rtrim(str_replace('\\', '/', dirname($scriptName)), '/');
// If basePath is just / or . , clear it
if ($basePath === '/' || $basePath === '.') $basePath = '';

$uri = parse_url($_SERVER['REQUEST_URI'], PHP_URL_PATH);

// Strip base path from URI for routing
if ($basePath && strpos($uri, $basePath) === 0) {
    $uri = substr($uri, strlen($basePath));
}

if (preg_match('#^/api(/|$)#', $uri)) {
    require __DIR__ . '/api/index.php';
    exit;
}

// Everything else: serve frontend files
// Normalize the path to prevent traversal
$uri = preg_replace('#/+#', '/', $uri);
$file = __DIR__ . '/frontend' . $uri;

// Resolve real path and verify it's within the frontend directory
$real_file = realpath($file);
$frontend_dir = realpath(__DIR__ . '/frontend');

// Helper: serve index.html with asset paths rewritten for subdirectory deployments
$serve_index = function() use ($basePath) {
    $index = __DIR__ . '/frontend/index.html';
    if (file_exists($index)) {
        header('Content-Type: text/html');
        $html = file_get_contents($index);
        // Rewrite absolute /frontend/ paths to include the base path
        if ($basePath) {
            $html = str_replace('/frontend/', $basePath . '/frontend/', $html);
        }
        echo $html;
        exit;
    }
    http_response_code(404);
    echo 'Frontend not found';
    exit;
};

if ($real_file === false || strpos($real_file, $frontend_dir) !== 0) {
    $serve_index();
}

if (!is_file($real_file)) {
    $serve_index();
}

$ext = pathinfo($real_file, PATHINFO_EXTENSION);
$types = [
    'css' => 'text/css',
    'js' => 'application/javascript',
    'html' => 'text/html',
    'svg' => 'image/svg+xml',
    'png' => 'image/png',
    'jpg' => 'image/jpeg',
    'json' => 'application/json',
];
if (isset($types[$ext])) header('Content-Type: ' . $types[$ext]);
readfile($real_file);