//  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 and distributed, without warranty, under the GNU Affero GPL license, either version 3 of the License or (at your option) any later version. Please see COPYING 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.Limits;
using IBBoard.CustomMath;
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)
		{
			//Do nothing special
		}
		
		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");
			GameSystem gameSystem = WarFoundryLoader.GetDefault ().GetGameSystem (systemID);
			
			if (gameSystem == null)
			{
				throw new InvalidFileException("Referenced game system, '"+systemID+"', did not exist");
			}
			
			Race race = new Race(id, subid, name, gameSystem, 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:categories/cat:cat"))
			{
				CreateCategoryFromElement(node, race);
			}
							
			foreach (XmlElement node  in WarFoundryXmlFactoryUtils.SelectNodes(extraData, "/race:race/race:equipment/race:equipmentItem"))
			{
				CreateEquipmentItemFromElement(node, race);
			}
							
			foreach (XmlElement node  in WarFoundryXmlFactoryUtils.SelectNodes(extraData, "/race:race/race:abilities/race:ability"))
			{
				CreateAbilityFromElement(node, race);
			}
			
			foreach (XmlElement node in WarFoundryXmlFactoryUtils.SelectNodes(extraData, "/race:race/race:units/race:unit"))
			{
				GetUnitTypeForElement(node, race);
			}
			
			race.SetAsFullyLoaded();
		}

		private Category CreateCategoryFromElement(XmlElement elem, Race parentRace)
		{
			Category cat = CreateCategoryFromElement(elem);
			parentRace.AddCategory(cat);
			return cat;
		}

		private UnitType GetUnitTypeFromDocument(XmlDocument doc, string id, Race parentRace)
		{
			XmlElement unitWithId = WarFoundryXmlFactoryUtils.SelectSingleElement (doc, "/race:race/race:units/race:unit[@id='" + id + "']");
			
			if (unitWithId == null)
			{
				throw new InvalidFileException("Could not find unit with ID "+id);
			}
			
			return GetUnitTypeForElement(unitWithId, parentRace);
		}
						
		private UnitType GetUnitTypeForElement(XmlElement elem, Race parentRace)
		{
			string id = elem.GetAttribute("id");
			UnitType type = parentRace.GetUnitType(id);

			if (type==null)
			{
				type = CreateUnitTypeFromElement(elem, id, parentRace);
			}
			
			return type;
		}

		private UnitType CreateUnitTypeFromElement(XmlElement elem, string id, Race parentRace)
		{
			string name = elem.GetAttribute("typeName");
			UnitType type = new UnitType(id, name, parentRace);
			LoadCoreValuesForUnitType(elem, type);
			LoadEquipmentSlotsForUnitType(elem, type);
			LoadEquipmentForUnitType(elem, type);
			LoadAbilitiesForUnitType(elem, type);
			LoadContainedUnitsForUnitType(elem, type);
			LoadRequirementsForUnitType(elem, type);
			LoadExtraDataForUnitType(elem, type);
			LoadNotesForUnitType(elem, type);
			parentRace.AddUnitType(type);
			return type;
		}

		private void LoadCoreValuesForUnitType(XmlElement elem, UnitType type)
		{
			try
			{
				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.GetDoubleValueFromAttribute(elem, "points");
				type.BaseUnitCost = XmlTools.GetDoubleValueFromAttribute(elem, "basePoints");
			}
			catch (FormatException ex)
			{
				throw new InvalidFileException(ex.Message, ex);
			}

			string mainCatID = elem.GetAttribute("cat");
			Category cat = type.Race.GetCategory(mainCatID);
			
			if (cat == null)
			{
				throw new InvalidFileException(String.Format("Category with ID '{1}' did not exist for UnitType '{0}'", type.Name, mainCatID));
			}
			
			type.MainCategory = cat;
			XmlElement statsElement = WarFoundryXmlFactoryUtils.SelectSingleElement(elem, "race:stats");
			Stats unitStats = ParseUnitStats(statsElement, type.GameSystem);
			type.SetUnitStats(unitStats);
		}

		private void LoadEquipmentSlotsForUnitType(XmlElement elem, UnitType type)
		{
			foreach (XmlElement equipSlot in WarFoundryXmlFactoryUtils.SelectNodes(elem, "race:equipmentSlots/race:equipmentSlot"))
			{
				LoadEquipmentSlotForUnitType (type, equipSlot);
			}
		}

		private static void LoadEquipmentSlotForUnitType (UnitType type, XmlElement equipSlot)
		{
			string slotName = equipSlot.GetAttribute ("name");
			AbstractLimit limit = GetMaxLimit (equipSlot);
			
			if (limit!=null)
			{
				type.AddEquipmentSlot (slotName, limit);
			}
		}

		private static AbstractLimit GetMaxLimit (XmlElement equipSlot)
		{
			XmlElement limitElem = WarFoundryXmlFactoryUtils.SelectSingleElement(equipSlot, "race:maxLimit/*[1]");
			return GetLimitFromElement(limitElem);
		}
		
		private static AbstractLimit GetLimitFromElement(XmlElement limitElem)
		{
			AbstractLimit limit = null;

			if (limitElem != null)
			{
				switch (limitElem.LocalName)
				{
					case "percentageLimit":
						double limitPercent = XmlTools.GetDoubleValueFromAttribute(limitElem, "limit");
						bool roundUp = limitElem.GetAttribute("round").Equals("up");
						limit = new SimpleRoundedPercentageLimit(limitPercent, roundUp);
						break;
					case "sizeConstrainedLimit":
						limit = new NumericSizeConstrainedLimit(XmlTools.GetIntValueFromAttribute(limitElem, "limit"));
						break;
					case "absoluteLimit":
						limit = new AbsoluteNumericLimit(XmlTools.GetIntValueFromAttribute(limitElem, "limit"));
						break;
					case "unitSizeLimit":
						limit = new SimpleRoundedPercentageLimit(100);
						break;
					default:
						//TODO: Warn of missing handler for when we've extended the limit list
						break;
				}
			}
			
			return limit;
		}


		private void LoadEquipmentForUnitType(XmlElement elem, UnitType type)
		{
			foreach (XmlElement equip in WarFoundryXmlFactoryUtils.SelectNodes(elem, "race:unitEquipment/race:unitEquipmentItem"))
			{
				string id = equip.GetAttribute("id");
				EquipmentItem equipItem = type.Race.GetEquipmentItem(id);
				
				if (equipItem!=null)
				{
					string mutexGroupString = equip.GetAttribute("exclusivityGroups");
					string[] mutexGroups;

					if (mutexGroupString == "")
					{
						mutexGroupString = equip.GetAttribute("exclusivityGroup");
					}

					if (mutexGroupString != "")
					{
						string[] groups = mutexGroupString.Split(',');
						int groupCount = groups.Length;

						for (int i = 0; i < groupCount; i++)
						{
							groups[i] = groups[i].Trim();
						}

						mutexGroups = groups;
					}
					else
					{
						mutexGroups = new string[0];
					}

					UnitEquipmentItem unitEquipItem = new UnitEquipmentItem(equipItem, type, mutexGroups);

					string equipSlot = equip.GetAttribute("equipmentSlot");

					if (equipSlot != "")
					{
						if (type.HasEquipmentSlot(equipSlot))
						{
							unitEquipItem.SlotName = equipSlot;
						}
						else
						{
							throw new InvalidFileException("Attribute 'equipmentSlot' of unit equipment item " + id + " for " + type.Name + " was not a valid slot name");
						}
					}

					AbstractLimit limit = GetMaxLimit(equip);

					if (limit != null)
					{
						unitEquipItem.MaxLimit = limit;
					}

					limit = GetMinLimit(equip);

					if (limit != null)
					{
						unitEquipItem.MinLimit = limit;
					}
					
					unitEquipItem.RoundNumberUp = equip.GetAttribute("roundDirection").Equals("up");
					
					try
					{
						unitEquipItem.IsRequired = XmlTools.GetBoolValueFromAttribute(equip, "required");
					}
					catch(FormatException e)
					{
						throw new InvalidFileException("Attribute 'required' of unit equipment item " + id + " for " + type.Name + " was not a valid boolean", e);
					}
					
					try
					{
						unitEquipItem.CostMultiplier = XmlTools.GetDoubleValueFromAttribute(equip, "costMultiplier");
					}
					catch (FormatException e)
					{
						throw new InvalidFileException("Attribute 'costMultiplier' of unit equipment item " + id + " for " + type.Name + " was not a valid decimal number", e);
					}
					
					try
					{
						unitEquipItem.CostRoundType = (RoundType) Enum.Parse(typeof(RoundType), equip.GetAttribute("costRounding"));
					}
					catch (ArgumentException e)
					{
						throw new InvalidFileException("Attribute 'costRounding' of unit equipment item " + id + " for " + type.Name + " was not a valid rounding type", e);
					}
				}
				else
				{
					throw new InvalidFileException("Equipment item with ID '" + id + "' was required by " + type.Name + " but was not found");
				}
			}		
		}

		private static AbstractLimit GetMinLimit(XmlElement elem)
		{
			XmlElement limitElem = WarFoundryXmlFactoryUtils.SelectSingleElement(elem, "race:minLimit/*[1]");
			return GetLimitFromElement(limitElem);
		}
		
		private void LoadAbilitiesForUnitType(XmlElement elem, UnitType type)
		{
			foreach (XmlElement abilityElem in WarFoundryXmlFactoryUtils.SelectNodes(elem, "race:unitAbilities/race:unitAbility"))
			{
				string id = abilityElem.GetAttribute("abilityID");
				Ability ability = type.Race.GetAbility(id);
				
				if (ability == null)
				{
					throw new InvalidFileException("Ability for "+type.Name+ " with ID "+id+ " did not exist in race definition");
				}

				bool required = XmlTools.GetBoolValueFromAttribute(abilityElem, "required");
				type.AddAbility(ability, required);
			}
		}
		
		private void LoadContainedUnitsForUnitType(XmlElement elem, UnitType type)
		{
			foreach (XmlElement containedUnitType in WarFoundryXmlFactoryUtils.SelectNodes(elem, "race:contains/race:containedUnit"))
			{
				string id = containedUnitType.GetAttribute("containedID");
				UnitType containedType = GetUnitTypeFromDocument(elem.OwnerDocument, id, type.Race);

				if (containedType!=null)
				{
					type.AddContainedUnitType(containedType);
				}
				else
				{
					throw new InvalidFileException("Unit type " + type.Name + " tried to contain undefined unit with ID "+id);
				}
			}
		}

		private void LoadRequirementsForUnitType(XmlElement elem, UnitType type)
		{
			//TODO: Load requirements
		}
		
		private void LoadExtraDataForUnitType(XmlElement elem, UnitType type)
		{
		}
		
		private void LoadNotesForUnitType(XmlElement elem, UnitType type)
		{
			XmlNode node = WarFoundryXmlFactoryUtils.SelectSingleNode(elem, "race:notes");

			if (node!=null)
			{
				type.Notes = node.InnerText;
			}
		}
		
		private Stats ParseUnitStats(XmlElement elem, GameSystem system)
		{
			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 WarFoundryXmlFactoryUtils.SelectNodes(elem, "race:stat"))
			{
				String statName = stat.GetAttribute("name");
				stats.SetStatValue(statName, stat.InnerText);
			}
			
			return stats;
		}
		
		private EquipmentItem CreateEquipmentItemFromElement(XmlElement elem, Race race)
		{
			string id = elem.GetAttribute("id");
			EquipmentItem item = race.GetEquipmentItem(id);

			if (item == null)
			{
				item = CreateEquipmentItemFromElement(elem, id, race);
			}
			
			return item;
		}

		private EquipmentItem CreateEquipmentItemFromElement(XmlElement elem, string id, Race race)
		{
			string name = elem.GetAttribute("name");
			EquipmentItem item = new EquipmentItem(id, name, race);
			double cost = 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
			item.Cost = cost;
			item.ItemArmourType = armourType;
			race.AddEquipmentItem(item);			
			return item;
		}
		
		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;
			race.AddAbility(ability);
			return ability;
		}
	}
}