using System;
using System.Collections.Generic;
using ln.http.exceptions;
using ln.types;
namespace ln.http.router
{
    public class VirtualHostRouter : HttpRouter
    {
        public HttpRouter DefaultRoute { get; set; }

        Dictionary<string, HttpRouter> virtualHosts = new Dictionary<string, HttpRouter>();

        public VirtualHostRouter()
        {
        }
        public VirtualHostRouter(HttpRouter defaultRoute)
        {
            DefaultRoute = defaultRoute;
        }
        public VirtualHostRouter(IEnumerable<KeyValuePair<string, HttpRouter>> routes)
        {
            foreach (KeyValuePair<string, HttpRouter> route in routes)
                virtualHosts.Add(route.Key, route.Value);
        }
        public VirtualHostRouter(HttpRouter defaultRoute,IEnumerable<KeyValuePair<string, HttpRouter>> routes)
            :this(routes)
        {
            DefaultRoute = defaultRoute;
        }
        public VirtualHostRouter(VirtualHostRouter source)
            : this(source.virtualHosts) { }

        public override IHTTPResource FindResource(HttpRequest httpRequest)
        {
            if (virtualHosts.TryGetValue(httpRequest.Hostname, out HttpRouter virtualHost))
                return virtualHost.FindResource(httpRequest);
            if (DefaultRoute != null)
                return DefaultRoute.FindResource(httpRequest);

            throw new HttpException(410, String.Format("Gone. Hostname {0} not found on this server.",httpRequest.Hostname));
        }
    }
}