// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
 
 
using System.ComponentModel;
using System.Runtime;
using System.Threading;
 
namespace System.ServiceModel.Channels
{
    public sealed class WebSocketTransportSettings : IEquatable<WebSocketTransportSettings>
    {
        public const string BinaryMessageReceivedAction = "http://schemas.microsoft.com/2011/02/websockets/onbinarymessage";
        public const string TextMessageReceivedAction = "http://schemas.microsoft.com/2011/02/websockets/ontextmessage";
        public const string SoapContentTypeHeader = "soap-content-type";
        public const string BinaryEncoderTransferModeHeader = "microsoft-binary-transfer-mode";
        internal const string WebSocketMethod = "WEBSOCKET";
        internal const string SoapSubProtocol = "soap";
        internal const string TransportUsageMethodName = "TransportUsage";
 
        private WebSocketTransportUsage _transportUsage;
        private TimeSpan _keepAliveInterval;
        private string _subProtocol;
 
        public WebSocketTransportSettings()
        {
            _transportUsage = WebSocketDefaults.TransportUsage;
            _keepAliveInterval = WebSocketDefaults.DefaultKeepAliveInterval;
            _subProtocol = WebSocketDefaults.SubProtocol;
        }
 
        private WebSocketTransportSettings(WebSocketTransportSettings settings)
        {
            Fx.Assert(settings != null, "settings should not be null.");
            TransportUsage = settings.TransportUsage;
            SubProtocol = settings.SubProtocol;
            KeepAliveInterval = settings.KeepAliveInterval;
        }
 
        [DefaultValue(WebSocketDefaults.TransportUsage)]
        public WebSocketTransportUsage TransportUsage
        {
            get
            {
                return _transportUsage;
            }
 
            set
            {
                WebSocketTransportUsageHelper.Validate(value);
                _transportUsage = value;
            }
        }
 
        [DefaultValue(typeof(TimeSpan), WebSocketDefaults.DefaultKeepAliveIntervalString)]
        public TimeSpan KeepAliveInterval
        {
            get
            {
                return _keepAliveInterval;
            }
 
            set
            {
                if (value < TimeSpan.Zero && value != Timeout.InfiniteTimeSpan)
                {
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException(
                                "value",
                                value,
                                SR.SFxTimeoutOutOfRange0));
                }
 
                if (TimeoutHelper.IsTooLarge(value))
                {
                    throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException(
                                            "value",
                                            value,
                                            SR.SFxTimeoutOutOfRangeTooBig));
                }
 
                _keepAliveInterval = value;
            }
        }
 
        [DefaultValue(WebSocketDefaults.SubProtocol)]
        public string SubProtocol
        {
            get
            {
                return _subProtocol;
            }
 
            set
            {
                if (value != null)
                {
                    if (value == string.Empty)
                    {
                        throw FxTrace.Exception.Argument("value", SR.WebSocketInvalidProtocolEmptySubprotocolString);
                    }
 
                    if (value.Split(WebSocketHelper.ProtocolSeparators).Length > 1)
                    {
                        throw FxTrace.Exception.Argument("value", SR.Format(SR.WebSocketInvalidProtocolContainsMultipleSubProtocolString, value));
                    }
 
                    string invalidChar;
                    if (WebSocketHelper.IsSubProtocolInvalid(value, out invalidChar))
                    {
                        throw FxTrace.Exception.Argument("value", SR.Format(SR.WebSocketInvalidProtocolInvalidCharInProtocolString, value, invalidChar));
                    }
                }
 
                _subProtocol = value;
            }
        }
 
        public bool DisablePayloadMasking
        {
            get
            {
                throw ExceptionHelper.PlatformNotSupported();
            }
 
            set
            {
                throw ExceptionHelper.PlatformNotSupported();
            }
        }
 
        public bool Equals(WebSocketTransportSettings other)
        {
            if (other == null)
            {
                return false;
            }
 
            return TransportUsage == other.TransportUsage
                   && KeepAliveInterval == other.KeepAliveInterval
                   && StringComparer.OrdinalIgnoreCase.Compare(SubProtocol, other.SubProtocol) == 0;
        }
 
        public override bool Equals(object obj)
        {
            if (obj == null)
            {
                return base.Equals(obj);
            }
 
            WebSocketTransportSettings settings = obj as WebSocketTransportSettings;
            return Equals(settings);
        }
 
        public override int GetHashCode()
        {
            int hashcode = TransportUsage.GetHashCode()
                           ^ KeepAliveInterval.GetHashCode();
            if (SubProtocol != null)
            {
                hashcode ^= SubProtocol.ToLowerInvariant().GetHashCode();
            }
 
            return hashcode;
        }
 
        internal WebSocketTransportSettings Clone()
        {
            return new WebSocketTransportSettings(this);
        }
    }
}