#region License
/*
 * HttpRequest.cs
 *
 * The MIT License
 *
 * Copyright (c) 2012-2022 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 CookieCollection _cookies;
    private string           _method;
    private string           _target;

    #endregion

    #region Private Constructors

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

    #endregion

    #region Internal Constructors

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

    #endregion

    #region Internal Properties

    internal string RequestLine {
      get {
        return String.Format (
                 "{0} {1} HTTP/{2}{3}", _method, _target, ProtocolVersion, CrLf
               );
      }
    }

    #endregion

    #region Public Properties

    public AuthenticationResponse AuthenticationResponse {
      get {
        var val = Headers["Authorization"];

        return val != null && val.Length > 0
               ? AuthenticationResponse.Parse (val)
               : null;
      }
    }

    public CookieCollection Cookies {
      get {
        if (_cookies == null)
          _cookies = Headers.GetCookies (false);

        return _cookies;
      }
    }

    public string HttpMethod {
      get {
        return _method;
      }
    }

    public bool IsWebSocketRequest {
      get {
        return _method == "GET"
               && ProtocolVersion > HttpVersion.Version10
               && Headers.Upgrades ("websocket");
      }
    }

    public override string MessageHeader {
      get {
        return RequestLine + HeaderSection;
      }
    }

    public string RequestTarget {
      get {
        return _target;
      }
    }

    #endregion

    #region Internal Methods

    internal static HttpRequest CreateConnectRequest (Uri targetUri)
    {
      var host = targetUri.DnsSafeHost;
      var port = targetUri.Port;
      var authority = String.Format ("{0}:{1}", host, port);

      var ret = new HttpRequest ("CONNECT", authority);

      ret.Headers["Host"] = port != 80 ? authority : host;

      return ret;
    }

    internal static HttpRequest CreateWebSocketHandshakeRequest (Uri targetUri)
    {
      var ret = new HttpRequest ("GET", targetUri.PathAndQuery);

      var headers = ret.Headers;

      var port = targetUri.Port;
      var schm = targetUri.Scheme;
      var defaultPort = (port == 80 && schm == "ws")
                        || (port == 443 && schm == "wss");

      headers["Host"] = !defaultPort
                        ? targetUri.Authority
                        : targetUri.DnsSafeHost;

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

      return ret;
    }

    internal HttpResponse GetResponse (Stream stream, int millisecondsTimeout)
    {
      WriteTo (stream);

      return HttpResponse.ReadResponse (stream, millisecondsTimeout);
    }

    internal static HttpRequest Parse (string[] messageHeader)
    {
      var len = messageHeader.Length;

      if (len == 0) {
        var msg = "An empty request header.";

        throw new ArgumentException (msg);
      }

      var rlParts = messageHeader[0].Split (new[] { ' ' }, 3);

      if (rlParts.Length != 3) {
        var msg = "It includes an invalid request line.";

        throw new ArgumentException (msg);
      }

      var method = rlParts[0];
      var target = rlParts[1];
      var ver = rlParts[2].Substring (5).ToVersion ();

      var headers = new WebHeaderCollection ();

      for (var i = 1; i < len; i++)
        headers.InternalSet (messageHeader[i], false);

      return new HttpRequest (method, target, ver, headers);
    }

    internal static HttpRequest ReadRequest (
      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)
          continue;

        buff.AppendFormat ("{0}; ", cookie);
      }

      var len = buff.Length;

      if (len <= 2)
        return;

      buff.Length = len - 2;

      Headers["Cookie"] = buff.ToString ();
    }

    #endregion
  }
}