//
// VPathToHost.cs
//
// Authors:
//	Gonzalo Paniagua Javier (gonzalo@ximian.com)
//	Lluis Sanchez Gual (lluis@ximian.com)
//
// Copyright (c) Copyright 2002-2007 Novell, Inc
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//


using System;
using System.Web.Hosting;
using System.Globalization;

namespace Mono.WebServer
{
	public class VPathToHost
	{
		public readonly string vhost;
		public readonly int vport;
		public readonly string vpath;
		public string realPath;
		public readonly bool haveWildcard;
		public IApplicationHost AppHost;
		public IRequestBroker RequestBroker;

		public VPathToHost (string vhost, int vport, string vpath, string realPath)
		{
			this.vhost = (vhost != null) ? vhost.ToLower (CultureInfo.InvariantCulture) : null;
			this.vport = vport;
			this.vpath = vpath;
			if (String.IsNullOrEmpty (vpath) || vpath [0] != '/')
				throw new ArgumentException ("Virtual path must begin with '/': " + vpath,
							     "vpath");

			this.realPath = realPath;
			AppHost = null;
			if (vhost != null && this.vhost.Length != 0 && this.vhost [0] == '*') {
				haveWildcard = true;
				if (this.vhost.Length > 2 && this.vhost [1] == '.')
					this.vhost = this.vhost.Substring (2);
			}
		}

		public bool TryClearHost (IApplicationHost host)
		{
			if (AppHost == host) {
				AppHost = null;
				return true;
			}

			return false;
		}

		public void UnloadHost ()
		{
			if (AppHost != null)
				AppHost.Unload ();

			AppHost = null;
		}

		public bool Redirect (string path, out string redirect)
		{
			redirect = null;
			if (path.Length == vpath.Length - 1) {
				redirect = vpath;
				return true;
			}

			return false;
		}

		public bool Match (string vhost, int vport, string vpath)
		{
			if (vport != -1 && this.vport != -1 && vport != this.vport)
				return false;

			if (vpath == null)
				return false;

			if (vhost != null && this.vhost != null && this.vhost != "*") {
				int length = this.vhost.Length;
				string lwrvhost = vhost.ToLower (CultureInfo.InvariantCulture);
				if (haveWildcard) {
					if (length > vhost.Length)
						return false;

					if (length == vhost.Length && this.vhost != lwrvhost)
						return false;

					if (vhost [vhost.Length - length - 1] != '.')
						return false;

					if (!lwrvhost.EndsWith (this.vhost))
						return false;

				} else if (this.vhost != lwrvhost) {
					return false;
				}
			}

			int local = vpath.Length;
			int vlength = this.vpath.Length;
			if (vlength > local) {
				// Check for /xxx requests to be redirected to /xxx/
				if (this.vpath [vlength - 1] != '/')
					return false;

				return (vlength - 1 == local && this.vpath.Substring (0, vlength - 1) == vpath);
			}

			return (vpath.StartsWith (this.vpath));
		}

		public void CreateHost (ApplicationServer server, WebSource webSource)
		{
			string v = vpath;
			if (v != "/" && v.EndsWith ("/")) {
				v = v.Substring (0, v.Length - 1);
			}

			AppHost = ApplicationHost.CreateApplicationHost (webSource.GetApplicationHostType(), v, realPath) as IApplicationHost;
			AppHost.Server = server;
			
			if (!server.SingleApplication) {
				// Link the host in the application domain with a request broker in the main domain
				RequestBroker = webSource.CreateRequestBroker ();
				AppHost.RequestBroker = RequestBroker;
			}
		}
	}
}