#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;
using System.Collections.Generic;
using System.Linq;
using OpenRA.Activities;
using OpenRA.Mods.Common.Activities;
using OpenRA.Mods.Common.Orders;
using OpenRA.Traits;

namespace OpenRA.Mods.Common.Traits
{
	public class DeployToUpgradeInfo : ITraitInfo, Requires<UpgradeManagerInfo>
	{
		[UpgradeGrantedReference, FieldLoader.Require]
		[Desc("The upgrades to grant when deploying and revoke when undeploying.")]
		public readonly string[] Upgrades = { };

		[Desc("The terrain types that this actor can deploy on to receive these upgrades. " +
			"Leave empty to allow any.")]
		public readonly HashSet<string> AllowedTerrainTypes = new HashSet<string>();

		[Desc("Cursor to display when able to (un)deploy the actor.")]
		public readonly string DeployCursor = "deploy";

		[Desc("Cursor to display when unable to (un)deploy the actor.")]
		public readonly string DeployBlockedCursor = "deploy-blocked";

		[SequenceReference, Desc("Animation to play for deploying/undeploying.")]
		public readonly string DeployAnimation = null;

		[Desc("Facing that the actor must face before deploying. Set to -1 to deploy regardless of facing.")]
		public readonly int Facing = -1;

		[Desc("Sound to play when deploying.")]
		public readonly string DeploySound = null;

		[Desc("Sound to play when undeploying.")]
		public readonly string UndeploySound = null;

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

	public class DeployToUpgrade : IResolveOrder, IIssueOrder
	{
		readonly Actor self;
		readonly DeployToUpgradeInfo info;
		readonly UpgradeManager manager;
		readonly bool checkTerrainType;
		readonly bool canTurn;
		readonly Lazy<ISpriteBody> body;

		bool isUpgraded;

		public DeployToUpgrade(Actor self, DeployToUpgradeInfo info)
		{
			this.self = self;
			this.info = info;
			manager = self.Trait<UpgradeManager>();
			checkTerrainType = info.AllowedTerrainTypes.Count > 0;
			canTurn = self.Info.Traits.WithInterface<IFacingInfo>().Any();
			body = Exts.Lazy(self.TraitOrDefault<ISpriteBody>);
		}

		public IEnumerable<IOrderTargeter> Orders
		{
			get { yield return new DeployOrderTargeter("DeployToUpgrade", 5,
				() => OnValidTerrain() ? info.DeployCursor : info.DeployBlockedCursor); }
		}

		public Order IssueOrder(Actor self, IOrderTargeter order, Target target, bool queued)
		{
			if (order.OrderID == "DeployToUpgrade")
				return new Order(order.OrderID, self, queued);

			return null;
		}

		public void ResolveOrder(Actor self, Order order)
		{
			if (order.OrderString != "DeployToUpgrade")
				return;

			if (!OnValidTerrain())
				return;

			if (isUpgraded)
			{
				// Play undeploy animation and after that revoke the upgrades
				self.QueueActivity(false, new CallFunc(() =>
				{
					if (!string.IsNullOrEmpty(info.UndeploySound))
						Game.Sound.Play(info.UndeploySound, self.CenterPosition);

					if (string.IsNullOrEmpty(info.DeployAnimation))
					{
						RevokeUpgrades();
						return;
					}

					if (body.Value != null)
						body.Value.PlayCustomAnimationBackwards(self, info.DeployAnimation, RevokeUpgrades);
					else
						RevokeUpgrades();
				}));
			}
			else
			{
				self.CancelActivity();

				// Turn
				if (info.Facing != -1 && canTurn)
					self.QueueActivity(new Turn(self, info.Facing));

				// Grant the upgrade
				self.QueueActivity(new CallFunc(GrantUpgrades));

				// Play deploy sound and animation
				self.QueueActivity(new CallFunc(() =>
				{
					if (!string.IsNullOrEmpty(info.DeploySound))
						Game.Sound.Play(info.DeploySound, self.CenterPosition);

					if (string.IsNullOrEmpty(info.DeployAnimation))
						return;

					if (body.Value != null)
						body.Value.PlayCustomAnimation(self, info.DeployAnimation,
							() => body.Value.PlayCustomAnimationRepeating(self, "idle"));
				}));
			}

			isUpgraded = !isUpgraded;
		}

		bool OnValidTerrain()
		{
			if (!self.World.Map.Contains(self.Location))
				return false;

			if (!checkTerrainType)
				return true;

			var tileSet = self.World.TileSet;
			var tiles = self.World.Map.MapTiles.Value;
			var terrainType = tileSet[tileSet.GetTerrainIndex(tiles[self.Location])].Type;

			return info.AllowedTerrainTypes.Contains(terrainType);
		}

		void GrantUpgrades()
		{
			foreach (var up in info.Upgrades)
				manager.GrantUpgrade(self, up, this);
		}

		void RevokeUpgrades()
		{
			foreach (var up in info.Upgrades)
				manager.RevokeUpgrade(self, up, this);
		}
	}
}