using System;
using System.Collections.Generic;
using System.Net;
using System.Text;
using System.Threading;
using UnityEngine;

namespace AllocsFixes.NetConnections.Servers.Web
{
	public class Web : IServer
	{
		private readonly HttpListener _listener = new HttpListener ();
		private Dictionary<string, PathHandler> handlers = new Dictionary<string, PathHandler> ();

		public Web (int port)
		{
			try {
				if (!HttpListener.IsSupported)
					throw new NotSupportedException ("Needs Windows XP SP2, Server 2003 or later.");
 
				handlers.Add ("/index.", new SimpleRedirectHandler ("/static/index.html"));
				handlers.Add ("/static/", new StaticHandler ("/static/", Application.dataPath + "/../webserver", true, true));
				handlers.Add ("/map/", new StaticHandler ("/map/", StaticDirectories.GetSaveGameDir () + "/map", false, false));

				_listener.Prefixes.Add (String.Format ("http://*:{0}/", port));
				_listener.AuthenticationSchemes = AuthenticationSchemes.Basic;
				_listener.Start ();

				ThreadPool.QueueUserWorkItem ((o) =>
				{
					try {
						while (_listener.IsListening) {
							ThreadPool.QueueUserWorkItem ((c) =>
							{
								HttpListenerContext ctx = c as HttpListenerContext;
								HandleRequest (ctx);
							}, _listener.GetContext ());
						}
					} catch {
					}
				}
				);

				Log.Out ("Started Webserver on " + port);
			} catch (Exception e) {
				Log.Out ("Error in Web.ctor: " + e);
			}
		}

		private void HandleRequest (HttpListenerContext ctx)
		{
			try {
				ctx.Response.ProtocolVersion = new Version ("1.1");

				HttpListenerBasicIdentity user;

				if (Authorize (ctx, out user)) {
					if (ctx.Request.Url.AbsolutePath.Length < 2) {
						handlers ["/index."].HandleRequest (ctx.Request, ctx.Response, user);
						return;
					} else {
						foreach (KeyValuePair<string, PathHandler> kvp in handlers) {
							if (ctx.Request.Url.AbsolutePath.StartsWith (kvp.Key)) {
								kvp.Value.HandleRequest (ctx.Request, ctx.Response, user);
								return;
							}
						}
					}

					Log.Out ("Error in Web.HandleRequest(): No handler found for path \"" + ctx.Request.Url.AbsolutePath + "\"");
					ctx.Response.StatusCode = (int)HttpStatusCode.NotFound;
				} else {
					ctx.Response.StatusCode = (int)HttpStatusCode.Unauthorized;
					ctx.Response.AddHeader("WWW-Authenticate", "Basic realm=\"\"");
				}

//				byte[] buf = Encoding.UTF8.GetBytes ("Hello World");
//				resp.ContentLength64 = buf.Length;
//				resp.ContentType = "text/html";
//				resp.ContentEncoding = Encoding.UTF8;
//				resp.OutputStream.Write (buf, 0, buf.Length);
			} catch (Exception e) {
				Log.Out ("Error in Web.HandleRequest(): " + e);
			} finally {
				ctx.Response.Close ();
			}
		}

		private bool Authorize (HttpListenerContext ctx, out HttpListenerBasicIdentity user)
		{
			try {
				user = (HttpListenerBasicIdentity)ctx.User.Identity;
				return user.Name.Equals ("admin") && user.Password.Equals (GamePrefs.GetString (EnumGamePrefs.ControlPanelPassword));
			} catch (NullReferenceException) {
				user = null;
				return false;
			}
		}

		public void Disconnect ()
		{
			try {
				_listener.Stop ();
				_listener.Close ();
			} catch (Exception e) {
				Log.Out ("Error in Web.Disconnect: " + e);
			}
		}

		public void WriteToClient (string line)
		{
			try {
				Log.Out ("NOT IMPLEMENTED: Web.WriteToClient");
			} catch (Exception e) {
				Log.Out ("Error in Web.WriteToClient: " + e);
			}
		}

		public void WriteToClient_Single (string line, IConnection client)
		{
			try {
				Log.Out ("NOT IMPLEMENTED: Web.WriteToClient_Single");
			} catch (Exception e) {
				Log.Out ("Error in Web.WriteToClient_Single: " + e);
			}
		}

	}
}