// WarFoundryXmlFactory.cs
//
//  Copyright (C) 2007 IBBoard
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License version 2.1 of the License as published by the Free
// Software Foundation.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 
//
//

using System;
using System.IO;
using System.Xml;
using System.Xml.Schema;
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>
	/// Summary description for WarFoundryXmlFactory.
	/// </summary>
	public class WarFoundryXmlFactory : AbstractNativeWarFoundryFactory
	{
		private Dictionary<IWarFoundryObject, XmlDocument> extraData = new Dictionary<IWarFoundryObject, XmlDocument>();
		private XmlResolver xmlResolver;

		public static AbstractNativeWarFoundryFactory CreateFactory()
		{
			return new WarFoundryXmlFactory();
		}
		
		protected WarFoundryXmlFactory() : base()
		{
			xmlResolver = new IBBXmlResolver(Constants.ExecutablePath);
		}
		
		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 XmlElement GetRootElementFromStream(Stream stream, WarFoundryXmlElementName elementName)
		{
			XmlDocument doc = CreateXmlDocumentFromStream(stream);			
			XmlElement elem = (XmlElement)doc.LastChild;
			
			if (!elem.Name.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 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 CreateArmyFromElement(file, elem);
		}
		
		private Army CreateArmyFromElement(ZipFile file, XmlElement elem)
		{
			string name = elem.GetAttribute("name");
			string systemID = elem.GetAttribute("gameSystem");
			GameSystem system = WarFoundryLoader.GetDefault().GetGameSystem(systemID);
			string raceID = elem.GetAttribute("race");
			Race race = WarFoundryLoader.GetDefault().GetRace(system, raceID);
			string pointsString = elem.GetAttribute("maxPoints");
			int points = 0;
			
			try
			{
				points = int.Parse(pointsString);
			}
			catch(FormatException)
			{
				throw new FormatException("Attribute 'maxPoints' of army '"+name+"' was not a valid number");
			}
			
			Army army = new Army(race, name, points, file);//, this);
			extraData[army] = elem.OwnerDocument;
			return army;
		}

		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 CreateSystemFromElement(file, elem);
		}
		
		private GameSystem CreateSystemFromElement(ZipFile file, XmlElement elem)
		{
			string id = elem.GetAttribute("id");
			string name = elem.GetAttribute("name");
			GameSystem system = new StagedLoadingGameSystem(id, name, this);
			//system.SourceZipFile = file.;
			extraData[system] = elem.OwnerDocument;
			return system;
		}
		
		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 CreateRaceFromElement(file, elem);
		}
		
		private Race CreateRaceFromElement(ZipFile file, XmlElement elem)
		{
			string id = elem.GetAttribute("id");
			string subid = elem.GetAttribute("subid");
			string systemID = elem.GetAttribute("system");
			string name = elem.GetAttribute("name");
			Race race = new StagedLoadingRace(id, subid, name, systemID, this);
			//race.SourceZipFile = file; //TODO reference source file
			extraData[race] = elem.OwnerDocument;
			return race;
		}

		/*public WarFoundryObject CreateObjectFromStream(ZipFile file, Stream stream)
		{
			try
			{
				WarFoundryObject obj = LoadFileObjectFromElement(file, elem);
				
				if (obj != null)
				{			
					extraData[obj] = doc;
					return obj;
				}
				else
				{
					throw new InvalidFileException(String.Format(Translation.GetTranslation("ErrorInvalidXmlFile", "XML file '{0}' was not a loadable XML file. Please ensure it is a valid and supported WarFoundry XML file."), file.Name));
				}
			}
			catch (XmlSchemaException ex)
			{
				throw new InvalidFileException(String.Format(Translation.GetTranslation("ErrorInvalidXmlFile", "Failed to parse invalid XML data file in {0}. Error at line {1} position {2}: {3}"), file.Name, ex.LineNumber, ex.LinePosition, ex.Message.Substring(0, ex.Message.IndexOf(".")+1)), ex);
			}
			catch (InvalidFileException ex)
			{
				throw new InvalidFileException(String.Format(Translation.GetTranslation("ErrorInvalidNamedXmlFile", "XML data file in '{0}' was not a valid XML file. It should contain three child nodes - XML definition, DocType and root node."), file.Name), ex);
			}
		}
		
		private WarFoundryObject LoadFileObjectFromElement(ZipFile file, XmlElement elem)
		{
			WarFoundryObject obj = null;
				
			if (elem.Name.Equals(WarFoundryXmlElementName.SYSTEM_ELEMENT.Value))
			{
				logger.Debug("Create GameSystem");
				obj = CreateSystemFromElement(file, elem);
			}
			else if (elem.Name.Equals(WarFoundryXmlElementName.RACE_ELEMENT.Value))
			{
				logger.Debug("Create Race");
				obj = CreateRaceFromElement(file, elem);
			}
			
			return obj;
		}*/

		public override void CompleteLoading(IWarFoundryStagedLoadObject obj)
		{		
			LogNotifier.DebugFormat(GetType(), "Complete loading of {0} with ID {1}", obj.GetType().Name, obj.ID);
				
			if (!obj.IsFullyLoaded)
			{			
				XmlDocument extra = extraData[obj];
				
				if (obj is GameSystem)
				{
					GameSystem system = (GameSystem)obj;
					XmlNode elem = extra.LastChild;
					
					XmlNode catsElem = elem.FirstChild;					
					Category[] cats;
					List<Category> catList = new List<Category>();
					WarFoundryObject tempObj;
					
					foreach (XmlElement cat in catsElem.ChildNodes)
					{
						tempObj = CreateObjectFromElement(cat);
						
						if (tempObj is Category)
						{
							catList.Add((Category)tempObj);
						}
						else
						{
							LogNotifier.WarnFormat(GetType(), "Object for string {0} was not of type Category", cat.OuterXml);
						}
					}
					
					cats = catList.ToArray();
					LogNotifier.DebugFormat(GetType(), "Found {0} categories", cats.Length);
					
					XmlElement statsElem = (XmlElement)catsElem.NextSibling;					
					Dictionary<string, SystemStats> sysStats = CreateSystemStatsSetFromElement(statsElem);
					string defaultStatsID = statsElem.GetAttribute("defaultStats");
										
					LogNotifier.DebugFormat(GetType(), "Complete loading of {0}", system.Name);
					system.Categories = cats;
					system.SystemStats = new SystemStatsSet(sysStats); 
					system.StandardSystemStatsID = defaultStatsID;
				}
				else if (obj is Race)
				{
					Race race = (Race)obj;
					XmlNode elem = extra.LastChild;
					XmlNode colNode = elem.FirstChild;
					
					Dictionary<string, UnitType> unitTypes = new Dictionary<string, UnitType>();
					
					foreach (XmlElement node in colNode.ChildNodes)
					{
						UnitType type = CreateUnitTypeFromElement(node, race, race.GameSystem);
						unitTypes.Add(type.ID, type);
					}
					
					colNode = colNode.NextSibling;
					List<Category> catOverrides = new List<Category>();
					
					if (colNode!=null && colNode.Name == WarFoundryXmlElementName.CATEGORIES_ELEMENT.Value)
					{
						foreach (XmlElement node in colNode.ChildNodes)
						{
							catOverrides.Add(CreateCategoryFromElement(node));
						}
						
						colNode = colNode.NextSibling;
					}
						
					Dictionary<string, EquipmentItem> raceEquipment = new Dictionary<string, EquipmentItem>();
					
					if (colNode!=null && colNode.Name == WarFoundryXmlElementName.RACE_EQUIPMENT_ITEMS_ELEMENT.Value)
					{
						foreach (XmlElement node in colNode.ChildNodes)
						{
							EquipmentItem item = CreateEquipmentItemFromElement(node, race);
							raceEquipment.Add(item.ID, item);
						}
					}
					
					Dictionary<string, Ability> raceAbilities = new Dictionary<string, Ability>();
					//TODO: Load abilities
					
					LogNotifier.DebugFormat(GetType(), "Complete loading of {0}", race.Name);
					race.Categories = catOverrides.ToArray();
					race.SetUnitTypes(unitTypes);
					race.SetEquipmentItems(raceEquipment);
					race.SetAbilities(raceAbilities);
				}
			}
			else
			{
				LogNotifier.Debug(GetType(), "Object is already fully loaded");
			}
		}
		
		protected XmlDocument CreateXmlDocumentFromStream(Stream stream)
		{
			XmlDocument doc = new XmlDocument();
			XmlReaderSettings settings = new XmlReaderSettings();
			settings.XmlResolver = xmlResolver;
			settings.ValidationType = ValidationType.DTD;
			settings.ProhibitDtd = false;
			settings.ValidationEventHandler+= new ValidationEventHandler(ValidationEventMethod);
			XmlReader reader = XmlReader.Create(stream, settings);
			
			try
			{
				doc.Load(reader);			
			}
			//Don't catch XMLSchemaExceptions - let them get thrown out
			finally
			{
				reader.Close();
			}
			
			if (doc.ChildNodes.Count!=3)
			{
				throw new InvalidFileException(Translation.GetTranslation("ErrorInvalidXmlFile", "XML file was not a valid XML file. It should contain three child nodes - XML definition, DocType and root node."));
			}

			return doc;
		}

		protected XmlDocument CreateXmlDocumentFromString(string xmlString)
		{			
			XmlReaderSettings settings = new XmlReaderSettings();
			settings.XmlResolver = xmlResolver;
			settings.ValidationType = ValidationType.DTD;
			settings.ProhibitDtd = false;
			settings.ValidationEventHandler+= new ValidationEventHandler(ValidationEventMethod);
			XmlReader reader = XmlReader.Create(new MemoryStream(Encoding.UTF8.GetBytes(xmlString)), settings);
			XmlDocument doc = new XmlDocument();

			try
			{
				doc.Load(reader);
			}
			catch(XmlSchemaException ex)
			{
				throw new InvalidFileException(Translation.GetTranslation("ErrorInvalidXmlString", "Failed to parse invalid XML string"), ex);
			}
			finally
			{
				//We might not need to make sure the memory stream is closed, but do it just in case
				reader.Close();
			}
			
			if (doc.ChildNodes.Count!=3)
			{
				throw new InvalidFileException(String.Format(Translation.GetTranslation("ErrorInvalidXmlFile", "XML string was not a valid XML file. It should contain three child nodes - XML definition, DocType and root node.")));
			}

			return doc;
		}
					
		private WarFoundryObject CreateObjectFromElement(XmlElement elem)
		{
			WarFoundryObject obj = null;
			LogNotifier.DebugFormat(GetType(), "Create object for <{0}>", elem.Name);
			
			if (elem.Name.Equals(WarFoundryXmlElementName.CATEGORY_ELEMENT.Value))
			{
				LogNotifier.Debug(GetType(), "Create Category");
				obj = CreateCategoryFromElement(elem);
			}
			else
			{
				LogNotifier.Debug(GetType(), "No match");
			}
			
			return obj;
		}
		
		private Category CreateCategoryFromElement(XmlElement elem)
		{
			string id = elem.GetAttribute("id");
			string name = elem.GetAttribute("name");
			int minPc, maxPc, minPts, maxPts, minChoices, maxChoices, baseValue, incValue, incAmount;
			
			try
			{
				minPc = int.Parse(elem.GetAttribute("minPercentage"));
			}
			catch(FormatException)
			{
				throw new FormatException("Attribute 'minPercentage' of category "+id+" was not a valid number");
			}

			try
			{
				maxPc = int.Parse(elem.GetAttribute("maxPercentage"));
			}
			catch(FormatException)
			{
				throw new FormatException("Attribute 'maxPercentage' of category "+id+" was not a valid number");
			}
			
			try
			{
				minPts = int.Parse(elem.GetAttribute("minPoints"));
			}
			catch(FormatException)
			{
				throw new FormatException("Attribute 'minPoints' of category "+id+" was not a valid number");
			}

			try
			{
				maxPts = int.Parse(elem.GetAttribute("maxPoints"));
			}
			catch(FormatException)
			{
				throw new FormatException("Attribute 'maxPoints' of category "+id+" was not a valid number");
			}
			
			try
			{
				minChoices = int.Parse(elem.GetAttribute("minChoices"));
			}
			catch(FormatException)
			{
				throw new FormatException("Attribute 'minChoices' of category "+id+" was not a valid number");
			}

			try
			{
				maxChoices = int.Parse(elem.GetAttribute("maxChoices"));
			}
			catch(FormatException)
			{
				throw new FormatException("Attribute 'maxChoices' of category "+id+" was not a valid number");
			}

			try
			{
				baseValue = int.Parse(elem.GetAttribute("baseValue"));
			
			}
			catch(FormatException)
			{
				throw new FormatException("Attribute 'baseValue' of category "+id+" was not a valid number");
			}
			
			try
			{
				incValue = int.Parse(elem.GetAttribute("incValue"));
			}
			catch(FormatException)
			{
				throw new FormatException("Attribute 'incValue' of category "+id+" was not a valid number");
			}

			try
			{
				incAmount = int.Parse(elem.GetAttribute("incAmount"));
			}
			catch(FormatException)
			{
				throw new FormatException("Attribute 'incAmount' of category "+id+" was not a valid number");
			}
			
			return new Category(id, name, minPts, maxPts, minPc, maxPc, minChoices, maxChoices, baseValue, incValue, incAmount);
		}
						
		private UnitType CreateUnitTypeFromElement(XmlElement elem, Race parentRace, GameSystem system)
		{
			string id = elem.GetAttribute("id");
			string name = elem.GetAttribute("typeName");
			string mainCatID = elem.GetAttribute("cat");
			int minNum, maxNum, minSize, maxSize, baseSize;//TODO: Add base size
			float points, unitPoints;
			Stats stats;
			List<UnitRequirement> unitRequirements = new List<UnitRequirement>();
			bool found = false;
			List<string> catIDs = new List<string>();
			string catID;
			
			try
			{
				minNum = int.Parse(elem.GetAttribute("minNum"));
			}
			catch(FormatException)
			{
				throw new FormatException("Attribute 'minNum' of unit "+id+" was not a valid number");
			}
			
			try
			{
				maxNum = int.Parse(elem.GetAttribute("maxNum"));
			}
			catch(FormatException)
			{
				throw new FormatException("Attribute 'maxNum' of unit "+id+" was not a valid number");
			}
			
			try
			{
				minSize = int.Parse(elem.GetAttribute("minSize"));
			}
			catch(FormatException)
			{
				throw new FormatException("Attribute 'minSize' of unit "+id+" was not a valid number");
			}
			
			try
			{
				maxSize = int.Parse(elem.GetAttribute("maxSize"));
			}
			catch(FormatException)
			{
				throw new FormatException("Attribute 'maxSize' of unit "+id+" was not a valid number");
			}
			
			if (minSize > maxSize && maxSize!=-1)
			{
				minSize = maxSize;
			}
			
			try
			{
				points = int.Parse(elem.GetAttribute("points"));
			}
			catch(FormatException)
			{
				throw new FormatException("Attribute 'points' of unit "+id+" was not a valid number");
			}
			
			try
			{
				unitPoints = int.Parse(elem.GetAttribute("unitPoints"));
			}
			catch(FormatException)
			{
				throw new FormatException("Attribute 'trooperPoints' of unit "+id+" was not a valid number");
			}
			
			XmlNode node = elem.FirstChild;
			
			foreach(XmlElement cat in node.ChildNodes)
			{
				catID = cat.GetAttribute("catID");
				catIDs.Add(catID);
				
				if (catID == mainCatID)
				{
					found = true;
				}
			}
			
			if (!found)
			{
				throw new InvalidFileException("The main cat "+mainCatID+" was not found in the list of categories for unit "+id);
			}
			
			node = node.NextSibling;			
			stats = ParseUnitStats((XmlElement)node, system);
			//TODO: Add unit requirements
			UnitType type = new UnitType(id, name, mainCatID, catIDs.ToArray(), minNum, maxNum, minSize, maxSize, unitPoints, points, stats, unitRequirements.ToArray(), parentRace);
			
			return type;
		}
		
		private Stats ParseUnitStats(XmlElement elem, GameSystem system)
		{
			List<Stat> statsList = new List<Stat>();
			String statsID = elem.GetAttribute("statSet");
			SystemStats statsSet;
			
			if (statsID == "")
			{
				statsSet = system.StandardSystemStats;
			}
			else
			{
				statsSet = system.SystemStats[statsID];
			}
			
			Stats stats = new Stats(statsSet);
			
			foreach (XmlElement stat in elem.ChildNodes)
			{
				String statID = stat.GetAttribute("name");
				StatSlot slot = statsSet[statID];
				
				if (slot!=null)
				{
					statsList.Add(new Stat(slot, stat.InnerText));
				}
				else
				{
					throw new InvalidFileException("The stat "+statID+" was not found in stats set "+statsID);
				}
			}
			
			stats.SetStats(statsList);
			
			return stats;
		}
		
		private Dictionary<string, SystemStats> CreateSystemStatsSetFromElement(XmlElement elem)
		{
			Dictionary<string, SystemStats> dict = new Dictionary<string,SystemStats>();
			
			foreach (XmlElement stats in elem.ChildNodes)
			{
				SystemStats sysStats = CreateSystemStatsFromElement(stats);
				dict.Add(sysStats.ID, sysStats);
			}
			
			return dict;
		}
		
		private SystemStats CreateSystemStatsFromElement(XmlElement elem)
		{
			List<StatSlot> slots = new List<StatSlot>();
			string id = elem.GetAttribute("id");	
			
			foreach (XmlElement slot in elem.ChildNodes)
			{
				StatSlot statSlot = new StatSlot(slot.GetAttribute("name"));
				slots.Add(statSlot);
			}
			
			return new SystemStats(id, slots.ToArray());
		}
		
		private EquipmentItem CreateEquipmentItemFromElement(XmlElement elem, Race race)
		{
			string id = elem.GetAttribute("id");
			string name = elem.GetAttribute("name");
			float cost = 0, min = 0, max = 0;
			ArmourType armourType;
			
			try
			{
				cost = float.Parse(elem.GetAttribute("cost"));
			}
			catch(FormatException)
			{
				throw new FormatException("Attribute 'cost' of equipment item "+id+" was not a valid number");
			}			
			
			try
			{
				min = float.Parse(elem.GetAttribute("min"));
			}
			catch(FormatException)
			{
				throw new FormatException("Attribute 'min' of equipment item "+id+" was not a valid number");
			}			
			
			try
			{
				max = float.Parse(elem.GetAttribute("max"));
			}
			catch(FormatException)
			{
				throw new FormatException("Attribute 'max' of equipment item "+id+" was not a valid number");
			}
			
			try
			{
				armourType = (ArmourType)Enum.Parse(typeof(ArmourType), elem.GetAttribute("armourType"));
			}
			catch(FormatException)
			{
				throw new InvalidFileException("Attribute 'armourType' of equipment "+id+" was not a valid value from the enumeration");
			}
			
			if (elem.ChildNodes.Count>0)
			{
				//It has stats!
				//TODO: Parse equipment stats
			}
			
			return new EquipmentItem(id, name, cost, min, max, armourType, race);
		}
		
		private void ValidationEventMethod(object sender, ValidationEventArgs e)
		{
			//TODO: Fire a validation failure event
    		LogNotifier.WarnFormat(GetType(), "Validation Error: {0}", e.Message);
		}
	}
}