param(
    [string]$Dir = ".",
    [int]$Port = 8080
)

$prefix = "http://localhost:$Port/"
$listener = New-Object System.Net.HttpListener
$listener.Prefixes.Add($prefix)
$listener.Start()

Write-Host "Server laeuft auf $prefix" -ForegroundColor Green
Write-Host "Druecke STRG+C zum Beenden."
Write-Host ""

try {
    while ($listener.IsListening) {
        $ctx = $listener.GetContext()

        try {
            $path = $ctx.Request.Url.AbsolutePath
            if ($path -eq "/") { $path = "/index.html" }

            $rel = $path.TrimStart("/")
            $file = Join-Path (Resolve-Path $Dir) $rel

            if ((Test-Path $file) -and -not (Get-Item $file -ErrorAction SilentlyContinue).PSIsContainer) {
                $bytes = [System.IO.File]::ReadAllBytes($file)
                $ext = [System.IO.Path]::GetExtension($file).ToLower()
                $mime = switch ($ext) {
                    ".html" { "text/html; charset=utf-8" }
                    ".htm"  { "text/html; charset=utf-8" }
                    ".css"  { "text/css" }
                    ".js"   { "application/javascript" }
                    ".json" { "application/json" }
                    ".png"  { "image/png" }
                    ".jpg"  { "image/jpeg" }
                    ".jpeg" { "image/jpeg" }
                    ".gif"  { "image/gif" }
                    ".svg"  { "image/svg+xml" }
                    ".ico"  { "image/x-icon" }
                    ".woff2"{ "font/woff2" }
                    default { "application/octet-stream" }
                }
                $ctx.Response.ContentType = $mime
                $ctx.Response.OutputStream.Write($bytes, 0, $bytes.Length)
            }
            else {
                $ctx.Response.StatusCode = 404
            }
        }
        finally {
            $ctx.Response.OutputStream.Close()
        }
    }
}
finally {
    $listener.Stop()
}