using System;
using System.Collections.Generic;
namespace ln.http.resources
{
    public class ResourceRouter : HttpRouter
    {
        Resource rootResource;
        ResourceApplication resourceApplication;

        public Resource RootResource => rootResource ?? resourceApplication.RootResource;

        public ResourceRouter(Resource rootResource)
        {
            this.rootResource = rootResource;
        }
        public ResourceRouter(ResourceApplication resourceApplication)
        {
            this.resourceApplication = resourceApplication;
        }

        public override IHTTPResource FindResource(HttpRequest httpRequest)
        {
            Resource currentResource = RootResource;
            Queue<String> pathStack = new Queue<String>(httpRequest.URI.AbsolutePath.Split(new String[] { "/" }, StringSplitOptions.RemoveEmptyEntries));

            while ((pathStack.Count > 0) && (!currentResource.HandlesDispatching))
            {
                String next = pathStack.Dequeue();
                if (!currentResource.Contains(next))
                {
                    return currentResource.GetFallBackResource();
                }
                currentResource = currentResource.GetResource(next);
            }

            return currentResource;
        }
    }
}