using System;
using System.Linq;
using OpenRa.Effects;
using OpenRa.GameRules;
using OpenRa.Traits.Activities;
using OpenRa.Graphics;
using System.Collections.Generic;

namespace OpenRa.Traits
{
	public class OwnedActorInfo
	{
		public readonly int HP = 0;
		public readonly ArmorType Armor = ArmorType.none;
		public readonly bool Crewed = false;		// replace with trait?
		public readonly int Sight = 0;
		public readonly bool WaterBound = false;
	}

	public class BuildingInfo : OwnedActorInfo, ITraitInfo
	{
		public readonly int Power = 0;
		public readonly bool BaseNormal = true;
		public readonly int Adjacent = 2;
		public readonly bool Bib = false;
		public readonly bool Capturable = false;
		public readonly bool Repairable = true;
		public readonly string Footprint = "x";
		public readonly string[] Produces = { };		// does this go somewhere else?
		public readonly int2 Dimensions = new int2(1, 1);
		public readonly bool Unsellable = false;

		public object Create(Actor self) { return new Building(self); }
	}

	public class Building : INotifyDamage, IResolveOrder, ITick, IRenderModifier
	{
		readonly Actor self;
		public readonly BuildingInfo Info;
		[Sync]
		bool isRepairing = false;

		public bool Disabled
		{
			get	{ return self.traits.WithInterface<IDisable>().Any(t => t.Disabled); }
		}

		public Building(Actor self)
		{
			this.self = self;
			Info = self.Info.Traits.Get<BuildingInfo>();
			self.CenterLocation = Game.CellSize 
				* ((float2)self.Location + .5f * (float2)Info.Dimensions);
		}
		
		public int GetPowerUsage()
		{
			var modifier = self.traits
				.WithInterface<IPowerModifier>()
				.Select(t => t.GetPowerModifier())
				.Product();
				
			var maxHP = self.Info.Traits.Get<BuildingInfo>().HP;

			if (Info.Power > 0)
				return (int)(modifier*(self.Health * Info.Power) / maxHP);
			else
				return (int)(modifier * Info.Power);
		}

		public void Damaged(Actor self, AttackInfo e)
		{
			if (e.DamageState == DamageState.Dead)
				Sound.Play("kaboom22.aud");
		}

		public void ResolveOrder(Actor self, Order order)
		{
			if (order.OrderString == "Sell")
			{
				self.CancelActivity();
				self.QueueActivity(new Sell());
			}

			if (order.OrderString == "Repair")
			{
				isRepairing = !isRepairing;
			}
		}

		int remainingTicks;

		public void Tick(Actor self)
		{
			if (!isRepairing) return;

			if (remainingTicks == 0)
			{
				var maxHP = self.Info.Traits.Get<BuildingInfo>().HP;
				var costPerHp = (Rules.General.URepairPercent * self.Info.Traits.Get<BuildableInfo>().Cost) / maxHP;
				var hpToRepair = Math.Min(Rules.General.URepairStep, maxHP - self.Health);
				var cost = (int)Math.Ceiling(costPerHp * hpToRepair);
				if (!self.Owner.TakeCash(cost))
				{
					remainingTicks = 1;
					return;
				}

				self.World.AddFrameEndTask(w => w.Add(new RepairIndicator(self)));
				self.InflictDamage(self, -hpToRepair, Rules.WarheadInfo["Super"]);
				if (self.Health == maxHP)
				{
					isRepairing = false;
					return;
				}
				remainingTicks = (int)(Rules.General.RepairRate * 60 * 25);
			}
			else
				--remainingTicks;
		}
		
		public IEnumerable<Renderable> ModifyRender(Actor self, IEnumerable<Renderable> r)
		{
			foreach (var a in r)
			{
				yield return a;
				if (Disabled)
					yield return a.WithPalette("disabled");
			}
		}
	}
}