#region Copyright & License Information
/*
 * Copyright 2007-2018 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, either version 3 of
 * the License, or (at your option) any later version. For more
 * information, see COPYING.
 */
#endregion

using System.Linq;
using OpenRA.Traits;

namespace OpenRA.Mods.Common.Traits.Render
{
	public class WithTurretAimAnimationInfo : ConditionalTraitInfo, Requires<WithSpriteTurretInfo>, Requires<ArmamentInfo>, Requires<AttackBaseInfo>
	{
		[Desc("Armament name")]
		public readonly string Armament = "primary";

		[Desc("Turret name")]
		public readonly string Turret = "primary";

		[Desc("Displayed while targeting.")]
		[SequenceReference] public readonly string Sequence = null;

		[Desc("Shown while reloading.")]
		[SequenceReference(null, true)] public readonly string ReloadPrefix = null;

		public override object Create(ActorInitializer init) { return new WithTurretAimAnimation(init, this); }

		public override void RulesetLoaded(Ruleset rules, ActorInfo ai)
		{
			var turretAttackAnim = ai.TraitInfos<WithTurretAttackAnimationInfo>().Any(t => t.Turret == Turret);
			if (turretAttackAnim)
				throw new YamlException("WithTurretAimAnimation is currently not compatible with WithTurretAttackAnimation. Don't use them on the same turret.");

			base.RulesetLoaded(rules, ai);
		}
	}

	public class WithTurretAimAnimation : ConditionalTrait<WithTurretAimAnimationInfo>, ITick
	{
		readonly AttackBase attack;
		readonly Armament armament;
		readonly WithSpriteTurret wst;
		string sequence;

		public WithTurretAimAnimation(ActorInitializer init, WithTurretAimAnimationInfo info)
			: base(info)
		{
			attack = init.Self.Trait<AttackBase>();
			armament = init.Self.TraitsImplementing<Armament>()
				.Single(a => a.Info.Name == info.Armament);
			wst = init.Self.TraitsImplementing<WithSpriteTurret>()
				.Single(st => st.Info.Turret == info.Turret);

			sequence = wst.Info.Sequence;
		}

		void ITick.Tick(Actor self)
		{
			if (IsTraitDisabled && sequence == wst.Info.Sequence)
				return;

			sequence = wst.Info.Sequence;
			if (!IsTraitDisabled && !string.IsNullOrEmpty(Info.Sequence) && attack.IsAiming)
				sequence = Info.Sequence;

			var prefix = (armament.IsReloading && !string.IsNullOrEmpty(Info.ReloadPrefix)) ? Info.ReloadPrefix : "";

			if (!IsTraitDisabled && !string.IsNullOrEmpty(prefix) && sequence != (prefix + sequence))
				sequence = prefix + sequence;

			wst.DefaultAnimation.ReplaceAnim(sequence);
		}
	}
}