#region Copyright & License Information
/*
 * Copyright 2007-2015 The OpenRA Developers (see AUTHORS)
 * This file is part of OpenRA, which is free software. It is made
 * available to you under the terms of the GNU General Public License
 * as published by the Free Software Foundation. For more information,
 * see COPYING.
 */
#endregion

using System.Collections.Generic;
using System.Linq;
using OpenRA.Graphics;
using OpenRA.Mods.Common.Graphics;
using OpenRA.Mods.Common.Traits;
using OpenRA.Traits;

namespace OpenRA.Mods.TS.Traits
{
	[Desc("Play an animation when a unit exits or blocks the exit after production finished.")]
	class WithProductionDoorOverlayInfo : ITraitInfo, IRenderActorPreviewSpritesInfo, Requires<RenderSpritesInfo>, Requires<IBodyOrientationInfo>, Requires<BuildingInfo>
	{
		public readonly string Sequence = "idle-door";
		public readonly string BuildSequence = "build-door";

		public object Create(ActorInitializer init) { return new WithProductionDoorOverlay(init.Self, this); }

		public IEnumerable<IActorPreview> RenderPreviewSprites(ActorPreviewInitializer init, RenderSpritesInfo rs, string image, int facings, PaletteReference p)
		{
			var anim = new Animation(init.World, image, () => 0);
			anim.PlayRepeating(Sequence);

			var bi = init.Actor.Traits.Get<BuildingInfo>();
			var offset = FootprintUtils.CenterOffset(init.World, bi).Y + 512; // Additional 512 units move from center -> top of cell
			yield return new SpriteActorPreview(anim, WVec.Zero, offset, p, rs.Scale);
		}
	}

	class WithProductionDoorOverlay : INotifyBuildComplete, ITick, INotifyProduction, INotifySold, INotifyDamageStateChanged
	{
		readonly WithProductionDoorOverlayInfo info;
		readonly RenderSprites renderSprites;
		readonly Animation door;

		bool isOpen;
		CPos openExit;
		bool buildComplete;

		public WithProductionDoorOverlay(Actor self, WithProductionDoorOverlayInfo info)
		{
			this.info = info;
			renderSprites = self.Trait<RenderSprites>();
			door = new Animation(self.World, renderSprites.GetImage(self));
			door.Play(RenderSprites.NormalizeSequence(door, self.GetDamageState(), info.Sequence));

			var buildingInfo = self.Info.Traits.Get<BuildingInfo>();

			var offset = FootprintUtils.CenterOffset(self.World, buildingInfo).Y + 512;
			renderSprites.Add("door_overlay_{0}".F(info.Sequence), new AnimationWithOffset(door, null, () => !buildComplete, offset));
		}

		public void BuildingComplete(Actor self)
		{
			buildComplete = true;
		}

		public void Tick(Actor self)
		{
			if (isOpen && !self.World.ActorMap.GetUnitsAt(openExit).Any(a => a != self))
			{
				isOpen = false;
				door.PlayBackwardsThen(RenderSprites.NormalizeSequence(door, self.GetDamageState(), info.BuildSequence),
					() => door.Play(RenderSprites.NormalizeSequence(door, self.GetDamageState(), info.Sequence)));
			}
		}

		public void DamageStateChanged(Actor self, AttackInfo e)
		{
			if (door.CurrentSequence != null)
				door.ReplaceAnim(RenderSprites.NormalizeSequence(door, e.DamageState, door.CurrentSequence.Name));
		}

		public void UnitProduced(Actor self, Actor other, CPos exit)
		{
			door.PlayThen(RenderSprites.NormalizeSequence(door, self.GetDamageState(), info.BuildSequence), () => { isOpen = true; openExit = exit; });
		}

		public void Selling(Actor self) { buildComplete = false; }
		public void Sold(Actor self) { }
	}
}