// This file (WarFoundryXmlFactory.cs) is a part of the IBBoard.WarFoundry.API project and is copyright 2009 IBBoard.
//
// The file and the library/program it is in are licensed under the GNU LGPL license, either version 3 of the License or (at your option) any later version. Please see COPYING.LGPL for more information and the full license.

using System;
using System.IO;
using System.Xml;
using System.Xml.Schema;
using System.Xml.XPath;
using System.Collections.Generic;
using System.Text;
using IBBoard;
using IBBoard.IO;
using IBBoard.Lang;
using IBBoard.Logging;
using IBBoard.Xml;
using IBBoard.WarFoundry.API.Requirements;
using IBBoard.WarFoundry.API.Objects;
using ICSharpCode.SharpZipLib.Zip;

namespace IBBoard.WarFoundry.API.Factories.Xml
{
	/// <summary>
	/// The WarFoundryXmlFactory loads WarFoundry classes from the native "XML in a zip" file format. Files are validated using the schema for the file type, so structurally invalid files should be identified at initial load.
	/// </summary>
	public class WarFoundryXmlFactory : AbstractNativeWarFoundryFactory
	{
		private static WarFoundryXmlFactory factory;
		private WarFoundryXmlGameSystemFactory gameSystemFactory;
		private WarFoundryXmlRaceFactory raceFactory;
		private WarFoundryXmlArmyFactory armyFactory;

		public static AbstractNativeWarFoundryFactory GetFactory()
		{
			if (factory == null)
			{
				factory = new WarFoundryXmlFactory();
			}
			
			return factory;
		}
		
		private WarFoundryXmlFactory() : base()
		{
			gameSystemFactory = new WarFoundryXmlGameSystemFactory(this);
			raceFactory = new WarFoundryXmlRaceFactory(this);
			armyFactory = new WarFoundryXmlArmyFactory();
		}
		
		protected override bool CheckCanFindArmyFileContent(ZipFile file)
		{
			return file.FindEntry("data.armyx", true) > -1;
		}
		
		protected override bool CheckCanFindSystemFileContent(ZipFile file)
		{
			return file.FindEntry("data.systemx", true) > -1;
		}
		
		protected override bool CheckCanFindRaceFileContent(ZipFile file)
		{
			return file.FindEntry("data.racex", true) > -1;
		}
		
		protected override Stream GetArmyDataStream(ZipFile file)
		{
			return file.GetInputStream(file.FindEntry("data.armyx", true));
		}
		
		protected override Army CreateArmyFromStream (ZipFile file, Stream dataStream)
		{
			XmlElement elem = GetRootElementFromStream(dataStream, WarFoundryXmlElementName.ARMY_ELEMENT);
			return armyFactory.CreateArmyFromElement(file, elem);
		}
		
		private XmlElement GetRootElementFromStream(Stream stream, WarFoundryXmlElementName elementName)
		{
			XmlDocument doc = WarFoundryXmlFactoryUtils.CreateXmlDocumentFromStream(stream);			
			XmlElement elem = (XmlElement)doc.LastChild;
			
			if (!elem.LocalName.Equals(elementName.Value))
			{
				throw new InvalidFileException(String.Format("Root element of XML was not valid. Expected {0} but got {1}", elementName.Value, elem.Name));
			}
			
			return elem;
		}

		protected override Stream GetGameSystemDataStream (ZipFile file)
		{
			return file.GetInputStream(file.FindEntry("data.systemx", true));
		}
		
		protected override GameSystem CreateGameSystemFromStream (ZipFile file, Stream dataStream)
		{
			XmlElement elem = GetRootElementFromStream(dataStream, WarFoundryXmlElementName.SYSTEM_ELEMENT);
			LogNotifier.Debug(GetType(), "Create GameSystem");
			return gameSystemFactory.CreateSystemFromElement(file, elem);
		}
		
		protected override Stream GetRaceDataStream (ZipFile file)
		{
			return file.GetInputStream(file.FindEntry("data.racex", true));
		}
		
		protected override Race CreateRaceFromStream (ZipFile file, Stream dataStream)
		{
			XmlElement elem = GetRootElementFromStream(dataStream, WarFoundryXmlElementName.RACE_ELEMENT);
			LogNotifier.Debug(GetType(), "Create Race");
			return raceFactory.CreateRaceFromElement(file, elem);
		}

		public override void CompleteLoading(IWarFoundryStagedLoadObject obj)
		{			
			LogNotifier.DebugFormat(GetType(), "Complete loading of {0} with ID {1}", obj.GetType().Name, obj.ID);
							
			if (obj is GameSystem)
			{
				gameSystemFactory.CompleteLoading((GameSystem)obj);
			}
			else if (obj is Race)
			{
				raceFactory.CompleteLoading((Race)obj);
			}
		}
	}
}