using System;
using System.Collections.Generic;
using System.IO;
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> ();
		private bool authEnabled = false;
		private string realm = "7dtd Admin Panel";

		public Web ()
		{
			try {
				int webPort = GamePrefs.GetInt (EnumGamePrefs.ControlPanelPort);
				if (!GamePrefs.GetBool (EnumGamePrefs.ControlPanelEnabled) || webPort < 1 || webPort > 65533) {
					Log.Out ("Webserver not started (ControlPanel not enabled or ControlPanelPort not within 1-65534)");
					return;
				}
				if (!Directory.Exists (Application.dataPath + "/../webserver")) {
					Log.Out ("Webserver not started (folder \"webserver\" not found in game folder)");
					return;
				}

				if (!HttpListener.IsSupported)
					throw new NotSupportedException ("Needs Windows XP SP2, Server 2003 or later.");
 
				handlers.Add ("/index.htm", new SimpleRedirectHandler ("/static/index.html"));
				handlers.Add ("/static/", new StaticHandler ("/static/", Application.dataPath + "/../webserver", false/*true*/, true)); // TODO: Enable cache
				handlers.Add ("/map/", new StaticHandler ("/map/", StaticDirectories.GetSaveGameDir () + "/map", false, false));
				handlers.Add ("/api/", new ApiHandler ("/api/"));

				_listener.Prefixes.Add (String.Format ("http://*:{0}/", webPort + 2));
				authEnabled = File.Exists (Application.dataPath + "/../webserver/protect");
				if (authEnabled)
					_listener.AuthenticationSchemes = AuthenticationSchemes.Basic;
				_listener.Start ();
				_listener.Realm = realm;

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

				NetTelnetServer.RegisterServer(this);


				Log.Out ("Started Webserver on " + (webPort + 2) + " (authentication " + (authEnabled ? "enabled" : "disabled") + ")");
			} 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 = Authorize (ctx);

				if (!authEnabled || (user.Name.ToLower ().Equals ("admin") && user.Password.Equals (GamePrefs.GetString (EnumGamePrefs.ControlPanelPassword)))) {
					if (ctx.Request.Url.AbsolutePath.Length < 2) {
						handlers ["/index.htm"].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.Headers ["WWW-Authenticate"] = "Basic realm=\"" + 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 HttpListenerBasicIdentity Authorize (HttpListenerContext ctx)
		{
			try {
				return (HttpListenerBasicIdentity)ctx.User.Identity;
			} catch (NullReferenceException) {
				return null;
			}
		}

		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);
			}
		}

		public static void SetResponseTextContent (HttpListenerResponse resp, string text)
		{
			byte[] buf = Encoding.UTF8.GetBytes (text);
			resp.ContentLength64 = buf.Length;
			resp.ContentType = "text/html";
			resp.ContentEncoding = Encoding.UTF8;
			resp.OutputStream.Write (buf, 0, buf.Length);
		}

	}
}