using System;
using System.Collections.Generic;
using System.Linq;
using OpenRa.FileFormats;
using OpenRa.Game.Graphics;
using IjwFramework.Types;

namespace OpenRa.Game.GameRules
{
	public class UnitInfoLoader
	{
		static Func<string, IniSection, UnitInfo> BindInfoCtor<T>()
			where T : UnitInfo
		{
			var ctor = typeof( T ).GetConstructor( new[] { typeof( string ), typeof( IniSection ) } );
			return ( s, i ) => (UnitInfo)ctor.Invoke( new object[] { s, i } );
		}

		readonly Dictionary<string, UnitInfo> unitInfos = new Dictionary<string, UnitInfo>();

		public UnitInfoLoader( IniFile rules )
		{
			var srcs = new[] 
			{
				Pair.New( "buildings.txt", BindInfoCtor<UnitInfo.BuildingInfo>() ),
				Pair.New( "infantry.txt", BindInfoCtor<UnitInfo.InfantryInfo>() ),
				Pair.New( "vehicles.txt", BindInfoCtor<UnitInfo.VehicleInfo>() ),
			};

			foreach( var src in srcs )
				foreach( var s in Util.ReadAllLines( FileSystem.Open( src.First ) ) )
				{
					var unitName = s.Split( ',' )[ 0 ];
					unitInfos.Add( unitName.ToLowerInvariant(),
						src.Second( unitName, rules.GetSection( unitName ) ) );
				}
		}

		public UnitInfo this[ string unitName ]
		{
			get
			{
				return unitInfos[ unitName.ToLowerInvariant() ];
			}
		}
	}

	public class UnitInfo
	{
		public enum ArmorType
		{
			none = 0,
			wood = 1,
			light = 2,
			heavy = 3,
			concrete = 4,
		}

		public readonly string Name;

		public readonly int Ammo = -1;
		public readonly ArmorType Armor = ArmorType.none;
		public readonly bool DoubleOwned = false;
		public readonly bool Cloakable = false;
		public readonly int Cost = 0;
		public readonly bool Crewed = false;
		public readonly bool Explodes = false;
		public readonly int GuardRange = -1; // -1 = use weapon's range
		public readonly string Image = null; // sprite-set to use when rendering
		public readonly bool Invisible = false;
		public readonly string Owner = "allies,soviet"; // TODO: make this an enum
		public readonly int Points = 0;
		public readonly string Prerequisite = "";
		public readonly string Primary = null;
		public readonly string Secondary = null;
		public readonly int ROT = 0;
		public readonly int Reload = 0;
		public readonly bool SelfHealing = false;
		public readonly bool Sensors = false; // no idea what this does
		public readonly int Sight = 1;
		public readonly int Strength = 1;
		public readonly int TechLevel = -1;

		public UnitInfo( string name, IniSection ini )
		{
			Name = name.ToLowerInvariant();

			FieldLoader.Load( this, ini );
		}

		public class MobileInfo : UnitInfo
		{
			public readonly int Passengers = 0;
			public readonly int Speed = 0;

			public MobileInfo( string name, IniSection ini )
				: base( name, ini )
			{
			}
		}

		public class InfantryInfo : MobileInfo
		{

			public readonly bool C4 = false;
			public readonly bool FraidyCat = false;
			public readonly bool Infiltrate = false;
			public readonly bool IsCanine = false;

			public InfantryInfo( string name, IniSection ini )
				: base( name, ini )
			{
			}
		}

		public class VehicleInfo : MobileInfo
		{
			public readonly bool Crushable = false;
			public readonly bool Tracked = false;
			public readonly bool NoMovingFire = false;

			public VehicleInfo( string name, IniSection ini )
				: base( name, ini )
			{
			}
		}

		public class BuildingInfo : UnitInfo
		{
			public readonly bool BaseNormal = true;
			public readonly int Adjacent = 1;
			public readonly bool Bib = false;
			public readonly bool Capturable = false;
			public readonly int Power = 0;
			public readonly bool Powered = false;
			public readonly bool Repairable = true;
			public readonly int Storage = 0;
			public readonly bool Unsellable = false;
			public readonly bool WaterBound = false;

			public BuildingInfo( string name, IniSection ini )
				: base( name, ini )
			{
			}
		}

		/*
		 * Example: HARV
		 *		Unit (can move, etc)
		 *		PlayerOwned
		 *		Selectable
		 *		CanHarvest
		 *		
		 * Example: PROC (refinery)
		 *		Building (can't move)
		 *		AcceptsOre (harvester returns here)
		 *		
		 * Example: 3TNK (soviet heavy tank)
		 *		Unit
		 *		Turret (can aim in different direction to movement)
		 * 
		 * Example: GUN (allied base defense turret)
		 *		Building
		 *		Turret
		 * 
		 * some traits can be determined by fields in rules.ini
		 * and some can't :
		 *		Gap-generator's ability
		 *		Nuke, chrone, curtain, (super-weapons)
		 *		Aircraft-landable
		 *		Selectable (bomber/spyplane can't be selected, for example)
		 *		AppearsFriendly (spy)
		 *		IsInfantry (can be build in TENT/BARR, 5-in-a-square)
		 *		IsVehicle
		 *		Squashable (sandbags, infantry)
		 *		Special rendering for war factory
		 */
	}
}