#region Copyright & License Information
/*
 * Copyright 2007-2019 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 OpenRA.Activities;
using OpenRA.Mods.Common.Traits;
using OpenRA.Traits;

namespace OpenRA.Mods.Common.Activities
{
	public class DeployForGrantedCondition : Activity
	{
		readonly GrantConditionOnDeploy deploy;
		readonly bool canTurn;

		public DeployForGrantedCondition(Actor self, GrantConditionOnDeploy deploy)
		{
			this.deploy = deploy;
			canTurn = self.Info.HasTraitInfo<IFacingInfo>();
		}

		protected override void OnFirstRun(Actor self)
		{
			// Turn to the required facing.
			if (deploy.Info.Facing != -1 && canTurn)
				QueueChild(new Turn(self, deploy.Info.Facing));
		}

		public override Activity Tick(Actor self)
		{
			// Do turn first, if needed.
			if (ChildActivity != null)
			{
				ChildActivity = ActivityUtils.RunActivity(self, ChildActivity);
				return this;
			}

			// Without this, turn for facing deploy angle will be canceled and immediately deploy!
			if (IsCanceled)
				return NextActivity;

			if (IsInterruptible)
			{
				IsInterruptible = false; // must DEPLOY from now.
				deploy.Deploy();
				return this;
			}

			// Wait for deployment
			if (deploy.DeployState == DeployState.Deploying)
				return this;

			// Failed or success, we are going to NextActivity.
			// Deploy() at the first run would have put DeployState == Deploying so
			// if we are back to DeployState.Undeployed, it means deploy failure.
			// Parent activity will see the status and will take appropriate action.
			return NextActivity;
		}
	}
}