#region License
/*
 * HttpRequest.cs
 *
 * The MIT License
 *
 * Copyright (c) 2012-2015 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

#region Contributors
/*
 * Contributors:
 * - David Burhans
 */
#endregion

using System;
using System.Collections.Specialized;
using System.IO;
using System.Text;
using WebSocketSharp.Net;

namespace WebSocketSharp
{
  internal class HttpRequest : HttpBase
  {
    #region Private Fields

    private string _method;
    private string _uri;
    private bool   _websocketRequest;
    private bool   _websocketRequestSet;

    #endregion

    #region Private Constructors

    private HttpRequest (string method, string uri, Version version, NameValueCollection headers)
      : base (version, headers)
    {
      _method = method;
      _uri = uri;
    }

    #endregion

    #region Internal Constructors

    internal HttpRequest (string method, string uri)
      : this (method, uri, HttpVersion.Version11, new NameValueCollection ())
    {
      Headers["User-Agent"] = "websocket-sharp/1.0";
    }

    #endregion

    #region Public Properties

    public AuthenticationResponse AuthenticationResponse {
      get {
        var res = Headers["Authorization"];
        return res != null && res.Length > 0
               ? AuthenticationResponse.Parse (res)
               : null;
      }
    }

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

    public string HttpMethod {
      get {
        return _method;
      }
    }

    public bool IsWebSocketRequest {
      get {
        if (!_websocketRequestSet) {
          _websocketRequest = _method == "GET"
                              && ProtocolVersion > HttpVersion.Version10
                              && Headers.Upgrades ("websocket");

          _websocketRequestSet = true;
        }

        return _websocketRequest;
      }
    }

    public string RequestUri {
      get {
        return _uri;
      }
    }

    #endregion

    #region Internal Methods

    internal static HttpRequest CreateConnectRequest (Uri uri)
    {
      var host = uri.DnsSafeHost;
      var port = uri.Port;
      var authority = String.Format ("{0}:{1}", host, port);
      var req = new HttpRequest ("CONNECT", authority);
      req.Headers["Host"] = port == 80 ? host : authority;

      return req;
    }

    internal static HttpRequest CreateWebSocketRequest (Uri uri)
    {
      var req = new HttpRequest ("GET", uri.PathAndQuery);
      var headers = req.Headers;

      // Only includes a port number in the Host header value if it's non-default.
      // See: https://tools.ietf.org/html/rfc6455#page-17
      var port = uri.Port;
      var schm = uri.Scheme;
      headers["Host"] = (port == 80 && schm == "ws") || (port == 443 && schm == "wss")
                        ? uri.DnsSafeHost
                        : uri.Authority;

      headers["Upgrade"] = "websocket";
      headers["Connection"] = "Upgrade";

      return req;
    }

    internal HttpResponse GetResponse (Stream stream, int millisecondsTimeout)
    {
      var buff = ToByteArray ();
      stream.Write (buff, 0, buff.Length);

      return Read<HttpResponse> (stream, HttpResponse.Parse, millisecondsTimeout);
    }

    internal static HttpRequest Parse (string[] headerParts)
    {
      var requestLine = headerParts[0].Split (new[] { ' ' }, 3);
      if (requestLine.Length != 3)
        throw new ArgumentException ("Invalid request line: " + headerParts[0]);

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

      return new HttpRequest (
        requestLine[0], requestLine[1], new Version (requestLine[2].Substring (5)), headers);
    }

    internal static HttpRequest Read (Stream stream, int millisecondsTimeout)
    {
      return Read<HttpRequest> (stream, Parse, millisecondsTimeout);
    }

    #endregion

    #region Public Methods

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

      var buff = new StringBuilder (64);
      foreach (var cookie in cookies.Sorted)
        if (!cookie.Expired)
          buff.AppendFormat ("{0}; ", cookie.ToString ());

      var len = buff.Length;
      if (len > 2) {
        buff.Length = len - 2;
        Headers["Cookie"] = buff.ToString ();
      }
    }

    public override string ToString ()
    {
      var output = new StringBuilder (64);
      output.AppendFormat ("{0} {1} HTTP/{2}{3}", _method, _uri, ProtocolVersion, CrLf);

      var headers = Headers;
      foreach (var key in headers.AllKeys)
        output.AppendFormat ("{0}: {1}{2}", key, headers[key], CrLf);

      output.Append (CrLf);

      var entity = EntityBody;
      if (entity.Length > 0)
        output.Append (entity);

      return output.ToString ();
    }

    #endregion
  }
}
