<?php
/**
 * PHP Built-in Server Router
 *
 * Usage: php -S localhost:8081 router.php
 *
 * Routes /api/* requests to api/index.php and serves all other
 * requests as static files (same behavior as Apache with .htaccess).
 */

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

// Route API requests to the API handler
if (strpos($uri, '/api/') === 0) {
    require __DIR__ . '/api/index.php';
    return true;
}

// Serve static files
$filePath = __DIR__ . $uri;
if ($uri !== '/' && is_file($filePath)) {
    // Video files need range request support for seeking
    $ext = strtolower(pathinfo($filePath, PATHINFO_EXTENSION));
    if (in_array($ext, ['mp4', 'webm', 'ogg', 'mov'])) {
        serveVideoWithRangeSupport($filePath, $ext);
        return true;
    }
    return false; // Let PHP's built-in server handle other files
}

// Default: serve index.html for directory requests
if (is_dir($filePath)) {
    $indexPath = rtrim($filePath, '/') . '/index.html';
    if (is_file($indexPath)) {
        return false;
    }
}

return false;

/**
 * Serve video files with HTTP Range request support (required for seeking).
 * PHP's built-in server does not support Range requests for static files.
 */
function serveVideoWithRangeSupport($filePath, $ext) {
    $mimeTypes = [
        'mp4'  => 'video/mp4',
        'webm' => 'video/webm',
        'ogg'  => 'video/ogg',
        'mov'  => 'video/quicktime',
    ];
    $mime = $mimeTypes[$ext] ?? 'application/octet-stream';
    $fileSize = filesize($filePath);

    header('Accept-Ranges: bytes');
    header('Content-Type: ' . $mime);

    if (isset($_SERVER['HTTP_RANGE'])) {
        // Parse range header: "bytes=start-end"
        if (preg_match('/bytes=(\d+)-(\d*)/', $_SERVER['HTTP_RANGE'], $matches)) {
            $start = intval($matches[1]);
            $end = $matches[2] !== '' ? intval($matches[2]) : $fileSize - 1;

            if ($start > $end || $start >= $fileSize) {
                http_response_code(416);
                header("Content-Range: bytes */$fileSize");
                return;
            }
            $end = min($end, $fileSize - 1);
            $length = $end - $start + 1;

            http_response_code(206);
            header("Content-Range: bytes $start-$end/$fileSize");
            header("Content-Length: $length");

            $fp = fopen($filePath, 'rb');
            fseek($fp, $start);
            $remaining = $length;
            while ($remaining > 0 && !feof($fp)) {
                $chunk = min(8192, $remaining);
                echo fread($fp, $chunk);
                $remaining -= $chunk;
            }
            fclose($fp);
        }
    } else {
        header("Content-Length: $fileSize");
        readfile($filePath);
    }
}