#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 : Handshake
  {
    #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
                 : !HeaderExists("Upgrade", "websocket")
                   ? false
                   : !HeaderExists("Connection", "Upgrade")
                     ? false
                     : !HeaderExists("Host")
                       ? false
                       : !HeaderExists("Sec-WebSocket-Key")
                         ? false
                         : HeaderExists("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.IsNull() || cookies.Count == 0)
        return;

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

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

    public override string ToString()
    {
      var buffer = new StringBuilder();
      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
  }
}