using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml;
using Rssdp.Infrastructure;

namespace Rssdp
{
    /// <summary>
    /// Base class representing the common details of a (root or embedded) device, either to be published or that has been located.
    /// </summary>
    /// <remarks>
    /// <para>Do not derive new types directly from this class. New device classes should derive from either <see cref="SsdpRootDevice"/> or <see cref="SsdpEmbeddedDevice"/>.</para>
    /// </remarks>
    /// <seealso cref="SsdpRootDevice"/>
    /// <seealso cref="SsdpEmbeddedDevice"/>
    public abstract class SsdpDevice
    {

        #region Fields

        private string _Udn;
        private string _DeviceType;
        private string _DeviceTypeNamespace;
        private int _DeviceVersion;
        private SsdpDevicePropertiesCollection _CustomProperties;
        private CustomHttpHeadersCollection _CustomResponseHeaders;

        private IList<SsdpDevice> _Devices;

        #endregion

        #region Events

        /// <summary>
        /// Raised when a new child device is added.
        /// </summary>
        /// <seealso cref="AddDevice"/>
        /// <seealso cref="DeviceAdded"/>
        public event EventHandler<DeviceEventArgs> DeviceAdded;

        /// <summary>
        /// Raised when a child device is removed.
        /// </summary>
        /// <seealso cref="RemoveDevice"/>
        /// <seealso cref="DeviceRemoved"/>
        public event EventHandler<DeviceEventArgs> DeviceRemoved;

        #endregion

        #region Constructors

        /// <summary>
        /// Derived type constructor, allows constructing a device with no parent. Should only be used from derived types that are or inherit from <see cref="SsdpRootDevice"/>.
        /// </summary>
        protected SsdpDevice()
        {
            _DeviceTypeNamespace = SsdpConstants.UpnpDeviceTypeNamespace;
            _DeviceType = SsdpConstants.UpnpDeviceTypeBasicDevice;
            _DeviceVersion = 1;

            this.Icons = new List<SsdpDeviceIcon>();
            _Devices = new List<SsdpDevice>();
            this.Devices = new ReadOnlyCollection<SsdpDevice>(_Devices);
            _CustomResponseHeaders = new CustomHttpHeadersCollection();
            _CustomProperties = new SsdpDevicePropertiesCollection();
        }

        /// <summary>
        /// Deserialisation constructor.
        /// </summary>
        /// <remarks><para>Uses the provided XML string and parent device properties to set the properties of the object. The XML provided must be a valid UPnP device description document.</para></remarks>
        /// <param name="deviceDescriptionXml">A UPnP device description XML document.</param>
        /// <exception cref="System.ArgumentNullException">Thrown if the <paramref name="deviceDescriptionXml"/> argument is null.</exception>
        /// <exception cref="System.ArgumentException">Thrown if the <paramref name="deviceDescriptionXml"/> argument is empty.</exception>
        protected SsdpDevice(string deviceDescriptionXml)
            : this()
        {
            if (deviceDescriptionXml == null) throw new ArgumentNullException("deviceDescriptionXml");
            if (deviceDescriptionXml.Length == 0) throw new ArgumentException("deviceDescriptionXml cannot be an empty string.", "deviceDescriptionXml");

            using (var ms = new System.IO.MemoryStream(System.Text.UTF8Encoding.UTF8.GetBytes(deviceDescriptionXml)))
            {
                var reader = XmlReader.Create(ms);

                LoadDeviceProperties(reader, this);
            }
        }

        #endregion

        #region Public Properties

        #region UPnP Device Description Properties

        /// <summary>
        /// Sets or returns the core device type (not including namespace, version etc.). Required.
        /// </summary>
        /// <remarks><para>Defaults to the UPnP basic device type.</para></remarks>
        /// <seealso cref="DeviceTypeNamespace"/>
        /// <seealso cref="DeviceVersion"/>
        /// <seealso cref="FullDeviceType"/>
        public string DeviceType
        {
            get
            {
                return _DeviceType;
            }
            set
            {
                _DeviceType = value;
            }
        }

        public string DeviceClass { get; set; }

        /// <summary>
        /// Sets or returns the namespace for the <see cref="DeviceType"/> of this device. Optional, but defaults to UPnP schema so should be changed if <see cref="DeviceType"/> is not a UPnP device type.
        /// </summary>
        /// <remarks><para>Defaults to the UPnP standard namespace.</para></remarks>
        /// <seealso cref="DeviceType"/>
        /// <seealso cref="DeviceVersion"/>
        /// <seealso cref="FullDeviceType"/>
        public string DeviceTypeNamespace
        {
            get
            {
                return _DeviceTypeNamespace;
            }
            set
            {
                _DeviceTypeNamespace = value;
            }
        }

        /// <summary>
        /// Sets or returns the version of the device type. Optional, defaults to 1.
        /// </summary>
        /// <remarks><para>Defaults to a value of 1.</para></remarks>
        /// <seealso cref="DeviceType"/>
        /// <seealso cref="DeviceTypeNamespace"/>
        /// <seealso cref="FullDeviceType"/>
        public int DeviceVersion
        {
            get
            {
                return _DeviceVersion;
            }
            set
            {
                _DeviceVersion = value;
            }
        }

        /// <summary>
        /// Returns the full device type string.
        /// </summary>
        /// <remarks>
        /// <para>The format used is urn:<see cref="DeviceTypeNamespace"/>:device:<see cref="DeviceType"/>:<see cref="DeviceVersion"/></para>
        /// </remarks>
        public string FullDeviceType
        {
            get
            {
                return String.Format("urn:{0}:{3}:{1}:{2}",
                this.DeviceTypeNamespace ?? String.Empty,
                this.DeviceType ?? String.Empty,
                this.DeviceVersion,
                this.DeviceClass ?? "device");
            }
        }

        /// <summary>
        /// Sets or returns the universally unique identifier for this device (without the uuid: prefix). Required.
        /// </summary>
        /// <remarks>
        /// <para>Must be the same over time for a specific device instance (i.e. must survive reboots).</para>
        /// <para>For UPnP 1.0 this can be any unique string. For UPnP 1.1 this should be a 128 bit number formatted in a specific way, preferably generated using the time and MAC based algorithm. See section 1.1.4 of http://upnp.org/specs/arch/UPnP-arch-DeviceArchitecture-v1.1.pdf for details.</para>
        /// <para>Technically this library implements UPnP 1.0, so any value is allowed, but we advise using UPnP 1.1 compatible values for good behaviour and forward compatibility with future versions.</para>
        /// </remarks>
        public string Uuid { get; set; }

        /// <summary>
        /// Returns (or sets*) a unique device name for this device. Optional, not recommended to be explicitly set.
        /// </summary>
        /// <remarks>
        /// <para>* In general you should not explicitly set this property. If it is not set (or set to null/empty string) the property will return a UDN value that is correct as per the UPnP specification, based on the other device properties.</para>
        /// <para>The setter is provided to allow for devices that do not correctly follow the specification (when we discover them), rather than to intentionally deviate from the specification.</para>
        /// <para>If a value is explicitly set, it is used verbatim, and so any prefix (such as uuid:) must be provided in the value.</para>
        /// </remarks>
        public string Udn
        {
            get
            {
                if (String.IsNullOrEmpty(_Udn) && !String.IsNullOrEmpty(this.Uuid))
                    return "uuid:" + this.Uuid;
                else
                    return _Udn;
            }
            set
            {
                _Udn = value;
            }
        }

        /// <summary>
        /// Sets or returns a friendly/display name for this device on the network. Something the user can identify the device/instance by, i.e Lounge Main Light. Required.
        /// </summary>
        /// <remarks><para>A short description for the end user. </para></remarks>
        public string FriendlyName { get; set; }

        /// <summary>
        /// Sets or returns the name of the manufacturer of this device. Required.
        /// </summary>
        public string Manufacturer { get; set; }

        /// <summary>
        /// Sets or returns a URL to the manufacturers web site. Optional.
        /// </summary>
        public Uri ManufacturerUrl { get; set; }

        /// <summary>
        /// Sets or returns a description of this device model. Recommended.
        /// </summary>
        /// <remarks><para>A long description for the end user.</para></remarks>
        public string ModelDescription { get; set; }

        /// <summary>
        /// Sets or returns the name of this model. Required.
        /// </summary>
        public string ModelName { get; set; }

        /// <summary>
        /// Sets or returns the number of this model. Recommended.
        /// </summary>
        public string ModelNumber { get; set; }

        /// <summary>
        /// Sets or returns a URL to a web page with details of this device model. Optional.
        /// </summary>
        /// <remarks>
        /// <para>Optional. May be relative to base URL.</para>
        /// </remarks>
        public Uri ModelUrl { get; set; }

        /// <summary>
        /// Sets or returns the serial number for this device. Recommended.
        /// </summary>
        public string SerialNumber { get; set; }

        /// <summary>
        /// Sets or returns the universal product code of the device, if any. Optional.
        /// </summary>
        /// <remarks>
        /// <para>If not blank, must be exactly 12 numeric digits.</para>
        /// </remarks>
        public string Upc { get; set; }

        /// <summary>
        /// Sets or returns the URL to a web page that can be used to configure/manager/use the device. Recommended.
        /// </summary>
        /// <remarks>
        /// <para>May be relative to base URL. </para>
        /// </remarks>
        public Uri PresentationUrl { get; set; }

        #endregion

        /// <summary>
        /// Returns a list of icons (images) that can be used to display this device. Optional, but recommended you provide at least one at 48x48 pixels.
        /// </summary>
        public IList<SsdpDeviceIcon> Icons
        {
            get;
            private set;
        }

        /// <summary>
        /// Returns a read-only enumerable set of <see cref="SsdpDevice"/> objects representing children of this device. Child devices are optional.
        /// </summary>
        /// <seealso cref="AddDevice"/>
        /// <seealso cref="RemoveDevice"/>
        public IEnumerable<SsdpDevice> Devices
        {
            get;
            private set;
        }

        /// <summary>
        /// Returns a dictionary of <see cref="SsdpDeviceProperty"/> objects keyed by <see cref="SsdpDeviceProperty.FullName"/>. Each value represents a custom property in the device description document.
        /// </summary>
        public SsdpDevicePropertiesCollection CustomProperties
        {
            get
            {
                return _CustomProperties;
            }
        }

        /// <summary>
        /// Provides a list of additional information to provide about this device in search response and notification messages.
        /// </summary>
        /// <remarks>
        /// <para>The headers included here are included in the (HTTP headers) for search response and alive notifications sent in relation to this device.</para>
        /// <para>Only values specified directly on this <see cref="SsdpDevice"/> instance will be included, headers from ancestors are not automatically included.</para>
        /// </remarks>
        public CustomHttpHeadersCollection CustomResponseHeaders
        {
            get
            {
                return _CustomResponseHeaders;
            }
        }

        #endregion

        #region Public Methods

        /// <summary>
        /// Adds a child device to the <see cref="Devices"/> collection.
        /// </summary>
        /// <param name="device">The <see cref="SsdpEmbeddedDevice"/> instance to add.</param>
        /// <remarks>
        /// <para>If the device is already a member of the <see cref="Devices"/> collection, this method does nothing.</para>
        /// <para>Also sets the <see cref="SsdpEmbeddedDevice.RootDevice"/> property of the added device and all descendant devices to the relevant <see cref="SsdpRootDevice"/> instance.</para>
        /// </remarks>
        /// <exception cref="System.ArgumentNullException">Thrown if the <paramref name="device"/> argument is null.</exception>
        /// <exception cref="System.InvalidOperationException">Thrown if the <paramref name="device"/> is already associated with a different <see cref="SsdpRootDevice"/> instance than used in this tree. Can occur if you try to add the same device instance to more than one tree. Also thrown if you try to add a device to itself.</exception>
        /// <seealso cref="DeviceAdded"/>
        public void AddDevice(SsdpEmbeddedDevice device)
        {
            if (device == null) throw new ArgumentNullException("device");
            if (device.RootDevice != null && device.RootDevice != this.ToRootDevice()) throw new InvalidOperationException("This device is already associated with a different root device (has been added as a child in another branch).");
            if (device == this) throw new InvalidOperationException("Can't add device to itself.");

            bool wasAdded = false;
            lock (_Devices)
            {
                device.RootDevice = this.ToRootDevice();
                _Devices.Add(device);
                wasAdded = true;
            }

            if (wasAdded)
                OnDeviceAdded(device);
        }

        /// <summary>
        /// Removes a child device from the <see cref="Devices"/> collection.
        /// </summary>
        /// <param name="device">The <see cref="SsdpEmbeddedDevice"/> instance to remove.</param>
        /// <remarks>
        /// <para>If the device is not a member of the <see cref="Devices"/> collection, this method does nothing.</para>
        /// <para>Also sets the <see cref="SsdpEmbeddedDevice.RootDevice"/> property to null for the removed device and all descendant devices.</para>
        /// </remarks>
        /// <exception cref="System.ArgumentNullException">Thrown if the <paramref name="device"/> argument is null.</exception>
        /// <seealso cref="DeviceRemoved"/>
        public void RemoveDevice(SsdpEmbeddedDevice device)
        {
            if (device == null) throw new ArgumentNullException("device");

            bool wasRemoved = false;
            lock (_Devices)
            {
                wasRemoved = _Devices.Remove(device);
                if (wasRemoved)
                {
                    device.RootDevice = null;
                }
            }

            if (wasRemoved)
                OnDeviceRemoved(device);
        }

        /// <summary>
        /// Raises the <see cref="DeviceAdded"/> event.
        /// </summary>
        /// <param name="device">The <see cref="SsdpEmbeddedDevice"/> instance added to the <see cref="Devices"/> collection.</param>
        /// <seealso cref="AddDevice"/>
        /// <seealso cref="DeviceAdded"/>		
        protected virtual void OnDeviceAdded(SsdpEmbeddedDevice device)
        {
            var handlers = this.DeviceAdded;
            if (handlers != null)
                handlers(this, new DeviceEventArgs(device));
        }

        /// <summary>
        /// Raises the <see cref="DeviceRemoved"/> event.
        /// </summary>
        /// <param name="device">The <see cref="SsdpEmbeddedDevice"/> instance removed from the <see cref="Devices"/> collection.</param>
        /// <seealso cref="RemoveDevice"/>
        /// <see cref="DeviceRemoved"/>
        protected virtual void OnDeviceRemoved(SsdpEmbeddedDevice device)
        {
            var handlers = this.DeviceRemoved;
            if (handlers != null)
                handlers(this, new DeviceEventArgs(device));
        }

        /// <summary>
        /// Writes this device to the specified <see cref="System.Xml.XmlWriter"/> as a device node and it's content.
        /// </summary>
        /// <param name="writer">The <see cref="System.Xml.XmlWriter"/> to output to.</param>
        /// <param name="device">The <see cref="SsdpDevice"/> to write out.</param>
        /// <exception cref="System.ArgumentNullException">Thrown if the <paramref name="writer"/> or <paramref name="device"/> argument is null.</exception>
        protected virtual void WriteDeviceDescriptionXml(XmlWriter writer, SsdpDevice device)
        {
            if (writer == null) throw new ArgumentNullException("writer");
            if (device == null) throw new ArgumentNullException("device");

            writer.WriteStartElement("device");

            if (!String.IsNullOrEmpty(device.FullDeviceType))
                WriteNodeIfNotEmpty(writer, "deviceType", device.FullDeviceType);

            WriteNodeIfNotEmpty(writer, "friendlyName", device.FriendlyName);
            WriteNodeIfNotEmpty(writer, "manufacturer", device.Manufacturer);
            WriteNodeIfNotEmpty(writer, "manufacturerURL", device.ManufacturerUrl);
            WriteNodeIfNotEmpty(writer, "modelDescription", device.ModelDescription);
            WriteNodeIfNotEmpty(writer, "modelName", device.ModelName);
            WriteNodeIfNotEmpty(writer, "modelNumber", device.ModelNumber);
            WriteNodeIfNotEmpty(writer, "modelURL", device.ModelUrl);
            WriteNodeIfNotEmpty(writer, "presentationURL", device.PresentationUrl);
            WriteNodeIfNotEmpty(writer, "serialNumber", device.SerialNumber);
            WriteNodeIfNotEmpty(writer, "UDN", device.Udn);
            WriteNodeIfNotEmpty(writer, "UPC", device.Upc);

            WriteCustomProperties(writer, device);
            WriteIcons(writer, device);
            WriteChildDevices(writer, device);

            writer.WriteEndElement();
        }

        /// <summary>
        /// Converts a string to a <see cref="Uri"/>, or returns null if the string provided is null.
        /// </summary>
        /// <param name="value">The string value to convert.</param>
        /// <returns>A <see cref="Uri"/>.</returns>
        protected static Uri StringToUri(string value)
        {
            if (!String.IsNullOrEmpty(value))
                return new Uri(value, UriKind.RelativeOrAbsolute);

            return null;
        }

        #endregion

        #region Private Methods

        #region Serialisation Methods

        private static void WriteCustomProperties(XmlWriter writer, SsdpDevice device)
        {
            foreach (var prop in device.CustomProperties)
            {
                writer.WriteElementString(prop.Namespace, prop.Name, SsdpConstants.SsdpDeviceDescriptionXmlNamespace, prop.Value);
            }
        }

        private static void WriteIcons(XmlWriter writer, SsdpDevice device)
        {
            if (device.Icons.Any())
            {
                writer.WriteStartElement("iconList");

                foreach (var icon in device.Icons)
                {
                    writer.WriteStartElement("icon");

                    writer.WriteElementString("mimetype", icon.MimeType);
                    writer.WriteElementString("width", icon.Width.ToString());
                    writer.WriteElementString("height", icon.Height.ToString());
                    writer.WriteElementString("depth", icon.ColorDepth.ToString());
                    writer.WriteElementString("url", icon.Url.ToString());

                    writer.WriteEndElement();
                }

                writer.WriteEndElement();
            }
        }

        private void WriteChildDevices(XmlWriter writer, SsdpDevice parentDevice)
        {
            if (parentDevice.Devices.Any())
            {
                writer.WriteStartElement("deviceList");

                foreach (var device in parentDevice.Devices)
                {
                    WriteDeviceDescriptionXml(writer, device);
                }

                writer.WriteEndElement();
            }
        }

        private static void WriteNodeIfNotEmpty(XmlWriter writer, string nodeName, string value)
        {
            if (!String.IsNullOrEmpty(value))
                writer.WriteElementString(nodeName, value);
        }

        private static void WriteNodeIfNotEmpty(XmlWriter writer, string nodeName, Uri value)
        {
            if (value != null)
                writer.WriteElementString(nodeName, value.ToString());
        }

        #endregion

        #region Deserialisation Methods

        private void LoadDeviceProperties(XmlReader reader, SsdpDevice device)
        {
            ReadUntilDeviceNode(reader);

            while (!reader.EOF)
            {
                if (reader.NodeType == XmlNodeType.EndElement && reader.Name == "device")
                {
                    reader.Read();
                    break;
                }

                if (!SetPropertyFromReader(reader, device))
                    reader.Read();
            }
        }

        private static void ReadUntilDeviceNode(XmlReader reader)
        {
            while (!reader.EOF && (reader.LocalName != "device" || reader.NodeType != XmlNodeType.Element))
            {
                reader.Read();
            }
        }

        [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Maintainability", "CA1502:AvoidExcessiveComplexity", Justification = "Yes, there is a large switch statement, not it's not really complex and doesn't really need to be rewritten at this point.")]
        private bool SetPropertyFromReader(XmlReader reader, SsdpDevice device)
        {
            switch (reader.LocalName)
            {
                case "friendlyName":
                    device.FriendlyName = reader.ReadElementContentAsString();
                    break;

                case "manufacturer":
                    device.Manufacturer = reader.ReadElementContentAsString();
                    break;

                case "manufacturerURL":
                    device.ManufacturerUrl = StringToUri(reader.ReadElementContentAsString());
                    break;

                case "modelDescription":
                    device.ModelDescription = reader.ReadElementContentAsString();
                    break;

                case "modelName":
                    device.ModelName = reader.ReadElementContentAsString();
                    break;

                case "modelNumber":
                    device.ModelNumber = reader.ReadElementContentAsString();
                    break;

                case "modelURL":
                    device.ModelUrl = StringToUri(reader.ReadElementContentAsString());
                    break;

                case "presentationURL":
                    device.PresentationUrl = StringToUri(reader.ReadElementContentAsString());
                    break;

                case "serialNumber":
                    device.SerialNumber = reader.ReadElementContentAsString();
                    break;

                case "UDN":
                    device.Udn = reader.ReadElementContentAsString();
                    SetUuidFromUdn(device);
                    break;

                case "UPC":
                    device.Upc = reader.ReadElementContentAsString();
                    break;

                case "deviceType":
                    SetDeviceTypePropertiesFromFullDeviceType(device, reader.ReadElementContentAsString());
                    break;

                case "iconList":
                    reader.Read();
                    LoadIcons(reader, device);
                    break;

                case "deviceList":
                    reader.Read();
                    LoadChildDevices(reader, device);
                    break;

                case "serviceList":
                    reader.Skip();
                    break;

                default:
                    if (reader.NodeType == XmlNodeType.Element && reader.Name != "device" && reader.Name != "icon")
                    {
                        AddCustomProperty(reader, device);
                        break;
                    }
                    else
                        return false;
            }
            return true;
        }

        private static void SetDeviceTypePropertiesFromFullDeviceType(SsdpDevice device, string value)
        {
            if (String.IsNullOrEmpty(value) || !value.Contains(":"))
                device.DeviceType = value;
            else
            {
                var parts = value.Split(':');
                if (parts.Length == 5)
                {
                    int deviceVersion = 1;
                    if (Int32.TryParse(parts[4], out deviceVersion))
                    {
                        device.DeviceTypeNamespace = parts[1];
                        device.DeviceType = parts[3];
                        device.DeviceVersion = deviceVersion;
                    }
                    else
                        device.DeviceType = value;
                }
                else
                    device.DeviceType = value;
            }
        }

        private static void SetUuidFromUdn(SsdpDevice device)
        {
            if (device.Udn != null && device.Udn.StartsWith("uuid:", StringComparison.OrdinalIgnoreCase))
                device.Uuid = device.Udn.Substring(5).Trim();
            else
                device.Uuid = device.Udn;
        }

        private static void LoadIcons(XmlReader reader, SsdpDevice device)
        {
            while (!reader.EOF)
            {
                while (!reader.EOF && reader.NodeType != XmlNodeType.Element)
                {
                    reader.Read();
                }

                if (reader.LocalName != "icon") break;

                while (reader.Name == "icon")
                {
                    var icon = new SsdpDeviceIcon();
                    LoadIconProperties(reader, icon);
                    device.Icons.Add(icon);

                    reader.Read();
                }
            }
        }

        private static void LoadIconProperties(XmlReader reader, SsdpDeviceIcon icon)
        {
            while (!reader.EOF)
            {
                if (reader.NodeType != XmlNodeType.Element)
                {
                    if (reader.NodeType == XmlNodeType.EndElement && reader.Name == "icon") break;

                    reader.Read();
                    continue;
                }

                switch (reader.LocalName)
                {
                    case "depth":
                        icon.ColorDepth = reader.ReadElementContentAsInt();
                        break;

                    case "height":
                        icon.Height = reader.ReadElementContentAsInt();
                        break;

                    case "width":
                        icon.Width = reader.ReadElementContentAsInt();
                        break;

                    case "mimetype":
                        icon.MimeType = reader.ReadElementContentAsString();
                        break;

                    case "url":
                        icon.Url = StringToUri(reader.ReadElementContentAsString());
                        break;

                }

                reader.Read();
            }
        }

        private void LoadChildDevices(XmlReader reader, SsdpDevice device)
        {
            while (!reader.EOF && reader.NodeType != XmlNodeType.Element)
            {
                reader.Read();
            }

            while (!reader.EOF)
            {
                while (!reader.EOF && reader.NodeType != XmlNodeType.Element)
                {
                    reader.Read();
                }

                if (reader.LocalName == "device")
                {
                    var childDevice = new SsdpEmbeddedDevice();
                    LoadDeviceProperties(reader, childDevice);
                    device.AddDevice(childDevice);
                }
                else
                    break;
            }
        }

        private static void AddCustomProperty(XmlReader reader, SsdpDevice device)
        {
            var newProp = new SsdpDeviceProperty() { Namespace = reader.Prefix, Name = reader.LocalName };
            int depth = reader.Depth;
            reader.Read();
            while (reader.NodeType == XmlNodeType.Whitespace || reader.NodeType == XmlNodeType.Comment)
            {
                reader.Read();
            }

            if (reader.NodeType != XmlNodeType.CDATA && reader.NodeType != XmlNodeType.Text)
            {
                while (!reader.EOF && (reader.NodeType != XmlNodeType.EndElement || reader.Name != newProp.Name || reader.Prefix != newProp.Namespace || reader.Depth != depth))
                {
                    reader.Read();
                }
                if (!reader.EOF)
                    reader.Read();
                return;
            }

            newProp.Value = reader.Value;

            // We don't support complex nested types or repeat/multi-value properties
            if (!device.CustomProperties.Contains(newProp.FullName))
                device.CustomProperties.Add(newProp);
        }

        #endregion

        //private bool ChildDeviceExists(SsdpDevice device)
        //{
        //	return (from d in _Devices where device.Uuid == d.Uuid select d).Any();
        //}

        #endregion

    }
}
