//
// System.Net.HttpWebResponse
//
// Authors:
// 	Lawrence Pit (loz@cable.a2000.nl)
// 	Gonzalo Paniagua Javier (gonzalo@ximian.com)
//      Daniel Nauck    (dna(at)mono-project(dot)de)
//
// (c) 2002 Lawrence Pit
// (c) 2003 Ximian, Inc. (http://www.ximian.com)
// (c) 2008 Daniel Nauck
//

//
// 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.Collections;
using System.Globalization;
using System.IO;
using System.IO.Compression;
using System.Net.Sockets;
using System.Runtime.Serialization;
using System.Text;

namespace System.Net 
{
#if MOONLIGHT
	internal class HttpWebResponse : WebResponse, ISerializable, IDisposable {
#else
	[Serializable]
	public class HttpWebResponse : WebResponse, ISerializable, IDisposable {
#endif
		Uri uri;
		WebHeaderCollection webHeaders;
		CookieCollection cookieCollection;
		string method;
		Version version;
		HttpStatusCode statusCode;
		string statusDescription;
		long contentLength;
		string contentType;
		CookieContainer cookie_container;

		bool disposed;
		Stream stream;
		
		// Constructors
		
		internal HttpWebResponse (Uri uri, string method, WebConnectionData data, CookieContainer container)
		{
			this.uri = uri;
			this.method = method;
			webHeaders = data.Headers;
			version = data.Version;
			statusCode = (HttpStatusCode) data.StatusCode;
			statusDescription = data.StatusDescription;
			stream = data.stream;
			contentLength = -1;

			try {
				string cl = webHeaders ["Content-Length"];
				if (String.IsNullOrEmpty (cl) || !Int64.TryParse (cl, out contentLength))
					contentLength = -1;
			} catch (Exception) {
				contentLength = -1;
			}

			if (container != null) {
				this.cookie_container = container;	
				FillCookies ();
			}

			string content_encoding = webHeaders ["Content-Encoding"];
			if (content_encoding == "gzip" && (data.request.AutomaticDecompression & DecompressionMethods.GZip) != 0)
				stream = new GZipStream (stream, CompressionMode.Decompress);
			else if (content_encoding == "deflate" && (data.request.AutomaticDecompression & DecompressionMethods.Deflate) != 0)
				stream = new DeflateStream (stream, CompressionMode.Decompress);
		}

		[Obsolete ("Serialization is obsoleted for this type", false)]
		protected HttpWebResponse (SerializationInfo serializationInfo, StreamingContext streamingContext)
		{
			SerializationInfo info = serializationInfo;

			uri = (Uri) info.GetValue ("uri", typeof (Uri));
			contentLength = info.GetInt64 ("contentLength");
			contentType = info.GetString ("contentType");
			method = info.GetString ("method");
			statusDescription = info.GetString ("statusDescription");
			cookieCollection = (CookieCollection) info.GetValue ("cookieCollection", typeof (CookieCollection));
			version = (Version) info.GetValue ("version", typeof (Version));
			statusCode = (HttpStatusCode) info.GetValue ("statusCode", typeof (HttpStatusCode));
		}
		
		// Properties
		
		public string CharacterSet {
			// Content-Type   = "Content-Type" ":" media-type
			// media-type     = type "/" subtype *( ";" parameter )
			// parameter      = attribute "=" value
			// 3.7.1. default is ISO-8859-1
			get { 
				string contentType = ContentType;
				if (contentType == null)
					return "ISO-8859-1";
				string val = contentType.ToLower (); 					
				int pos = val.IndexOf ("charset=", StringComparison.Ordinal);
				if (pos == -1)
					return "ISO-8859-1";
				pos += 8;
				int pos2 = val.IndexOf (';', pos);
				return (pos2 == -1)
				     ? contentType.Substring (pos) 
				     : contentType.Substring (pos, pos2 - pos);
			}
		}
		
		public string ContentEncoding {
			get {
				CheckDisposed ();
				string h = webHeaders ["Content-Encoding"];
				return h != null ? h : "";
			}
		}
		
		public override long ContentLength {		
			get {
				return contentLength;
			}
		}
		
		public override string ContentType {		
			get {
				CheckDisposed ();

				if (contentType == null)
					contentType = webHeaders ["Content-Type"];

				return contentType;
			}
		}
		
		public CookieCollection Cookies {
			get {
				CheckDisposed ();
				if (cookieCollection == null)
					cookieCollection = new CookieCollection ();
				return cookieCollection;
			}
			set {
				CheckDisposed ();
				cookieCollection = value;
			}
		}
		
		public override WebHeaderCollection Headers {		
			get {
				return webHeaders; 
			}
		}

		static Exception GetMustImplement ()
		{
			return new NotImplementedException ();
		}
		
		[MonoTODO]
		public override bool IsMutuallyAuthenticated
		{
			get {
				throw GetMustImplement ();
			}
		}
		
		public DateTime LastModified {
			get {
				CheckDisposed ();
				try {
					string dtStr = webHeaders ["Last-Modified"];
					return MonoHttpDate.Parse (dtStr);
				} catch (Exception) {
					return DateTime.Now;	
				}
			}
		}
		
		public string Method {
			get {
				CheckDisposed ();
				return method; 
			}
		}
		
		public Version ProtocolVersion {
			get {
				CheckDisposed ();
				return version; 
			}
		}
		
		public override Uri ResponseUri {		
			get {
				CheckDisposed ();
				return uri; 
			}
		}		
		
		public string Server {
			get {
				CheckDisposed ();
				return webHeaders ["Server"]; 
			}
		}
		
		public HttpStatusCode StatusCode {
			get {
				return statusCode; 
			}
		}
		
		public string StatusDescription {
			get {
				CheckDisposed ();
				return statusDescription; 
			}
		}

		// Methods
		
		public string GetResponseHeader (string headerName)
		{
			CheckDisposed ();
			string value = webHeaders [headerName];
			return (value != null) ? value : "";
		}

		internal void ReadAll ()
		{
			WebConnectionStream wce = stream as WebConnectionStream;
			if (wce == null)
				return;
				
			try {
				wce.ReadAll ();
			} catch {}
		}

		public override Stream GetResponseStream ()
		{
			CheckDisposed ();
			if (stream == null)
				return Stream.Null;  
			if (0 == String.Compare (method, "HEAD", true)) // see par 4.3 & 9.4
				return Stream.Null;  

			return stream;
		}
		
		void ISerializable.GetObjectData (SerializationInfo serializationInfo,
		   				  StreamingContext streamingContext)
		{
			GetObjectData (serializationInfo, streamingContext);
		}

		protected override void GetObjectData (SerializationInfo serializationInfo,
			StreamingContext streamingContext)
		{
			SerializationInfo info = serializationInfo;

			info.AddValue ("uri", uri);
			info.AddValue ("contentLength", contentLength);
			info.AddValue ("contentType", contentType);
			info.AddValue ("method", method);
			info.AddValue ("statusDescription", statusDescription);
			info.AddValue ("cookieCollection", cookieCollection);
			info.AddValue ("version", version);
			info.AddValue ("statusCode", statusCode);
		}

		// Cleaning up stuff

		public override void Close ()
		{
			if (stream != null) {
				Stream st = stream;
				stream = null;
				if (st != null)
					st.Close ();
			}
		}
		
		void IDisposable.Dispose ()
		{
			Dispose (true);
			GC.SuppressFinalize (this);  
		}

		void Dispose (bool disposing) 
		{
			this.disposed = true;
			if (disposing)
				Close ();
		}
		
		private void CheckDisposed () 
		{
			if (disposed)
				throw new ObjectDisposedException (GetType ().FullName);
		}

		void FillCookies ()
		{
			if (webHeaders == null)
				return;

			string value = webHeaders.Get ("Set-Cookie");
			if (value != null) {
				SetCookie (value);
			}

			value = webHeaders.Get ("Set-Cookie2");
			if (value != null) {
				SetCookie (value);
			}
		}

		void SetCookie (string header)
		{
			if (cookieCollection == null)
				cookieCollection = new CookieCollection ();

			var parser = new CookieParser (header);
			foreach (var cookie in parser.Parse ()) {
				if (cookie.Domain == "")
					cookie.Domain = uri.Host;

				cookieCollection.Add (cookie);
				if (cookie_container != null)
					cookie_container.Add (uri, cookie);
			}
		}
	}	
}