//  This file (WarFoundryXmlRaceFactory.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.Collections.Generic;
using System.IO;
using System.Xml;
using IBBoard.Xml;
using IBBoard.IO;
using IBBoard.Logging;
using ICSharpCode.SharpZipLib.Zip;
using IBBoard.WarFoundry.API.Objects;

namespace IBBoard.WarFoundry.API.Factories.Xml
{
	/// <summary>
	/// A sub-factory for loading WarFoundry Race XML files
	/// </summary>
	public class WarFoundryXmlRaceFactory : AbstractStagedLoadedSubFactory
	{
		private Dictionary<Race, XmlDocument> extraData = new Dictionary<Race, XmlDocument>();
		
		public WarFoundryXmlRaceFactory(WarFoundryXmlFactory factory) : base (factory)
		{
		}
		
		private void StoreExtraData(Race wfObject, XmlElement elem)
		{
			extraData[wfObject] = elem.OwnerDocument;
		}
	
		private XmlDocument GetExtraData(Race obj)
		{
			XmlDocument extra = null;
			extraData.TryGetValue(obj, out extra);			
			return extra;
		}
		
		public 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 Race(id, subid, name, systemID, mainFactory);
			StoreExtraData(race, elem);
			return race;
		}
		
		public void CompleteLoading(Race race)
		{
			if (!WarFoundryXmlFactoryUtils.CanCompleteLoading(race))
			{
				return;
			}
			
			race.SetAsLoading();			
			XmlDocument extraData = GetExtraData(race);
			
			foreach (XmlElement node in WarFoundryXmlFactoryUtils.SelectNodes(extraData, "/race:race/race:units/race:unit"))
			{
				UnitType type = CreateUnitTypeFromElement(node, race, race.GameSystem);
				race.AddUnitType(type);
			}
			
			foreach (XmlElement node in WarFoundryXmlFactoryUtils.SelectNodes(extraData, "/race:race/race:categories/cat:cat"))
			{
				race.AddCategory(CreateCategoryFromElement(node));
			}
							
			foreach (XmlElement node  in WarFoundryXmlFactoryUtils.SelectNodes(extraData, "/race:race/race:equipment/cat:equipmentItem"))
			{
				EquipmentItem item = CreateEquipmentItemFromElement(node, race);
				race.AddEquipmentItem(item);
			}
							
			foreach (XmlElement node  in WarFoundryXmlFactoryUtils.SelectNodes(extraData, "/race:race/race:abilities/cat:ability"))
			{
				Ability ability = CreateAbilityFromElement(node, race);
				race.AddAbility(ability);
			}
			
			race.SetAsFullyLoaded();
			LogNotifier.DebugFormat(GetType(), "Completed loading of Race with ID {0}", race.ID);
		}
						
		private UnitType CreateUnitTypeFromElement(XmlElement elem, Race parentRace, GameSystem system)
		{
			string id = elem.GetAttribute("id");
			string name = elem.GetAttribute("typeName");
			UnitType type = new UnitType(id, name, parentRace);
			type.MaxNumber = XmlTools.GetIntValueFromAttribute(elem, "maxNum");
			type.MinNumber = XmlTools.GetIntValueFromAttribute(elem, "minNum");
			type.MaxSize = XmlTools.GetIntValueFromAttribute(elem, "maxSize");
			type.MinSize = XmlTools.GetIntValueFromAttribute(elem, "minSize");
			type.BaseSize = XmlTools.GetIntValueFromAttribute(elem, "baseSize");
			type.CostPerTrooper = XmlTools.GetIntValueFromAttribute(elem, "points");
			type.BaseUnitCost = XmlTools.GetIntValueFromAttribute(elem, "unitPoints");
			string mainCatID = elem.GetAttribute("cat");
			Category cat = parentRace.GetCategory(mainCatID);
			
			if (cat == null)
			{
				throw new InvalidDataException(String.Format("Attribute 'cat' of UnitType {0} (value: {1}) did not reference a valid category", id, mainCatID));
			}
			
			type.MainCategory = cat;
			XmlElement statsElement = WarFoundryXmlFactoryUtils.SelectSingleElement(elem, "/race:race/race:units/race:unit/race:stats");
			type.UnitStats = ParseUnitStats(statsElement, system);
			//TODO: Add unit requirements
			LogNotifier.Debug(GetType(), "Loaded "+type.Name);
			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.GetSystemStatsForID(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 EquipmentItem CreateEquipmentItemFromElement(XmlElement elem, Race race)
		{
			string id = elem.GetAttribute("id");
			string name = elem.GetAttribute("name");
			double cost = 0, min = 0, max = 0;
			ArmourType armourType;
			
			try
			{
				cost = XmlTools.GetDoubleValueFromAttribute(elem, "cost");
			}
			catch(FormatException ex)
			{
				throw new InvalidFileException("Attribute 'cost' of equipment item "+id+" was not a valid number", ex);
			}			
			
			try
			{
				armourType = (ArmourType)Enum.Parse(typeof(ArmourType), elem.GetAttribute("armourType"));
			}
			catch(ArgumentException ex)
			{
				throw new InvalidFileException("Attribute 'armourType' of equipment "+id+" was not a valid value from the enumeration", ex);
			}
			
			//TODO: Parse equipment stats if there are any
			
			return new EquipmentItem(id, name, cost, min, max, armourType, race);
		}
		
		private Ability CreateAbilityFromElement(XmlElement elem, Race race)
		{
			string id = elem.GetAttribute("id");
			string name = elem.GetAttribute("name");
			Ability ability = new Ability(id, name);
			XmlNode node = elem.SelectSingleNode("description", WarFoundryXmlFactoryUtils.GetNamespaceManager());
			ability.Description = (node == null) ? "" : node.InnerText;
			return ability;
		}
	}
}