#region License
/*
 * RequestHandshake.cs
 *
 * The MIT License
 *
 * Copyright (c) 2012-2013 sta.blockhead
 * 
 * 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.
 */
#endregion

using System;
using System.Collections.Specialized;
using System.Linq;
using System.Text;
using WebSocketSharp.Net;
using WebSocketSharp.Net.WebSockets;

namespace WebSocketSharp
{
  internal class RequestHandshake : HandshakeBase
  {
    #region Private Fields

    private NameValueCollection _queryString;

    #endregion

    #region Private Constructors

    private RequestHandshake ()
    {
    }

    #endregion

    #region Public Constructors

    public RequestHandshake (string uriString)
    {
      HttpMethod = "GET";
      RequestUri = uriString.ToUri ();
      AddHeader ("User-Agent", "websocket-sharp/1.0");
      AddHeader ("Upgrade", "websocket");
      AddHeader ("Connection", "Upgrade");
    }

    #endregion

    #region Public Properties

    public CookieCollection Cookies {
      get {
        return Headers.GetCookies (false);
      }
    }

    public string HttpMethod {
      get; private set;
    }

    public bool IsWebSocketRequest {
      get {
        return HttpMethod != "GET"
               ? false
               : ProtocolVersion < HttpVersion.Version11
                 ? false
                 : !ContainsHeader ("Upgrade", "websocket")
                   ? false
                   : !ContainsHeader ("Connection", "Upgrade")
                     ? false
                     : !ContainsHeader ("Host")
                       ? false
                       : !ContainsHeader ("Sec-WebSocket-Key")
                         ? false
                         : ContainsHeader ("Sec-WebSocket-Version");
      }
    }

    public NameValueCollection QueryString {
      get {
        if (_queryString == null)
        {
          _queryString = new NameValueCollection ();
          var i = RawUrl.IndexOf ('?');
          if (i > 0)
          {
            var query = RawUrl.Substring (i + 1);
            var components = query.Split ('&');
            foreach (var c in components)
            {
              var nv = c.GetNameAndValue ("=");
              if (nv.Key != null)
              {
                var name = nv.Key.UrlDecode ();
                var val = nv.Value.UrlDecode ();
                _queryString.Add (name, val);
              }
            }
          }
        }

        return _queryString;
      }
    }

    public string RawUrl {
      get {
        return RequestUri.IsAbsoluteUri
               ? RequestUri.PathAndQuery
               : RequestUri.OriginalString;
      }
    }

    public Uri RequestUri {
      get; private set;
    }

    #endregion

    #region Public Methods

    public static RequestHandshake Parse (string [] request)
    {
      var requestLine = request [0].Split (' ');
      if (requestLine.Length != 3)
      {
        var msg = "Invalid HTTP Request-Line: " + request [0];
        throw new ArgumentException (msg, "request");
      }

      var headers = new WebHeaderCollection ();
      for (int i = 1; i < request.Length; i++)
        headers.SetInternal (request [i], false);

      return new RequestHandshake {
        Headers = headers,
        HttpMethod = requestLine [0],
        RequestUri = requestLine [1].ToUri (),
        ProtocolVersion = new Version (requestLine [2].Substring (5))
      };
    }

    public static RequestHandshake Parse (WebSocketContext context)
    {
      return new RequestHandshake {
        Headers = context.Headers,
        HttpMethod = "GET",
        RequestUri = context.RequestUri,
        ProtocolVersion = HttpVersion.Version11
      };
    }

    public void SetCookies (CookieCollection cookies)
    {
      if (cookies == null || cookies.Count == 0)
        return;

      var sorted = cookies.Sorted.ToArray ();
      var header = new StringBuilder (sorted [0].ToString (), 64);
      for (int i = 1; i < sorted.Length; i++)
        if (!sorted [i].Expired)
          header.AppendFormat ("; {0}", sorted [i].ToString ());

      AddHeader ("Cookie", header.ToString ());
    }

    public void SetAuthorization (AuthenticationResponse response)
    {
      var credentials = response.ToString ();
      AddHeader ("Authorization", credentials);
    }

    public override string ToString ()
    {
      var buffer = new StringBuilder (64);
      buffer.AppendFormat ("{0} {1} HTTP/{2}{3}", HttpMethod, RawUrl, ProtocolVersion, CrLf);
      foreach (string key in Headers.AllKeys)
        buffer.AppendFormat ("{0}: {1}{2}", key, Headers [key], CrLf);

      buffer.Append (CrLf);
      return buffer.ToString ();
    }

    #endregion
  }
}