//
// ServiceDocument.cs
//
// Author:
//	Atsushi Enomoto <atsushi@ximian.com>
//
// Copyright (C) 2009 Novell, Inc.  http://www.novell.com
//
// 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.Generic;
using System.Collections.ObjectModel;
using System.IO;
using System.ServiceModel;
using System.ServiceModel.Channels;
using System.Xml;

namespace System.ServiceModel.Syndication
{
	public class ServiceDocument
	{
		public static TServiceDocument Load<TServiceDocument> (XmlReader reader)
			where TServiceDocument : ServiceDocument, new()
		{
			var doc = new TServiceDocument ();
			new AtomPub10ServiceDocumentFormatter<TServiceDocument> (doc).ReadFrom (reader);
			return doc;
		}

		public static ServiceDocument Load (XmlReader reader)
		{
			return Load<ServiceDocument> (reader);
		}


		public ServiceDocument ()
		{
			Workspaces = new Collection<Workspace> ();
		}

		public ServiceDocument (IEnumerable<Workspace> workspaces)
			: this ()
		{
			if (workspaces != null)
				foreach (var w in workspaces)
					Workspaces.Add (w);
		}

		ServiceDocumentFormatter formatter;
		SyndicationExtensions extensions = new SyndicationExtensions ();

		internal ServiceDocumentFormatter InternalFormatter {
			set { formatter = value; }
		}

		public Dictionary<XmlQualifiedName, string> AttributeExtensions {
			get { return extensions.Attributes; }
		}

		public Uri BaseUri { get; set; }

		public SyndicationElementExtensionCollection ElementExtensions {
			get { return extensions.Elements; }
		}

		public string Language { get; set; }

		public Collection<Workspace> Workspaces { get; private set; }


		protected internal virtual Workspace CreateWorkspace ()
		{
			return new Workspace ();
		}

		public ServiceDocumentFormatter GetFormatter ()
		{
			if (formatter == null)
				formatter = new AtomPub10ServiceDocumentFormatter (this);
			return formatter;
		}

		public void Save (XmlWriter writer)
		{
			GetFormatter ().WriteTo (writer);
		}

		protected internal virtual bool TryParseAttribute (string name, string ns, string value, string version)
		{
			if (version != "http://www.w3.org/2007/app")
				return false;

			switch (ns) {
			case "http://www.w3.org/XML/1998/namespace":
				switch (name) {
				case "base":
					BaseUri = new Uri (value, UriKind.RelativeOrAbsolute);
					return true;
				case "lang":
					Language = value;
					return true;
				}
				return false;
			}
			return false;
		}

		protected internal virtual bool TryParseElement (XmlReader reader, string version)
		{
			if (reader == null)
				throw new ArgumentNullException ("reader");

			reader.MoveToContent ();

			if (reader.LocalName != "service" || reader.NamespaceURI != version)
				return false;

			for (int i = 0; i < reader.AttributeCount; i++) {
				reader.MoveToAttribute (i);
				if (!TryParseAttribute (reader.LocalName, reader.NamespaceURI, reader.Value, version))
					AttributeExtensions.Add (new XmlQualifiedName (reader.LocalName, reader.NamespaceURI), reader.Value);
			}
			reader.MoveToElement ();

			if (reader.IsEmptyElement)
				throw new XmlException ("AtomPP service element requires at least one workspace element");

			reader.ReadStartElement ();

			for (reader.MoveToContent (); reader.NodeType != XmlNodeType.EndElement; reader.MoveToContent ()) {
				if (reader.LocalName == "workspace" && reader.NamespaceURI == version) {
					var ws = CreateWorkspace ();
					if (ws.TryParseElement (reader, version)) {
						Workspaces.Add (ws);
						continue;
					}
				}
				ElementExtensions.Add (new SyndicationElementExtension (reader));
			}

			reader.ReadEndElement ();

			return true;
		}

		protected internal virtual void WriteAttributeExtensions (XmlWriter writer, string version)
		{
			extensions.WriteAttributeExtensions (writer, version);
		}

		protected internal virtual void WriteElementExtensions (XmlWriter writer, string version)
		{
			extensions.WriteElementExtensions (writer, version);
		}
	}
}