namespace DTLib.Web.Routes;

public class ServeFilesRoute(IOPath _publicDir, string _homePageUrl = "index.html") : Route
{
    public override async Task<HttpStatusCode> HandleRequest(HttpListenerContext ctx)
    {
        if (ctx.Request.HttpMethod != "GET")
            return HttpStatusCode.BadRequest;

        string requestPath = ctx.Request.Url?.AbsolutePath ?? "/";
        if (requestPath == "/")
            requestPath = _homePageUrl;
        string ext = Path.Extension(requestPath).Str;
        IOPath filePath = Path.Concat(_publicDir, requestPath);
        if (!File.Exists(filePath)) 
            return HttpStatusCode.NotFound;
        
        string contentType = ext switch
        {
            "html" => "text/html",
            "css" => "text/css",
            "js" or "jsx" or "ts" or "tsx" or "map" => "text/javascript",
            _ => "binary/octet-stream"
        };
        ctx.Response.Headers.Set("Content-Type", contentType);
        ctx.Response.Headers.Set("Content-Disposition", "attachment filename=" + filePath.LastName());
        
        var fileStream = File.OpenRead(filePath);
        ctx.Response.ContentLength64 = fileStream.Length;
        await fileStream.CopyToAsync(ctx.Response.OutputStream);
        return HttpStatusCode.OK;
    }
}