#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.Linq;
using OpenRA.Mods.RA;
using OpenRA.Traits;
using OpenRA.Widgets;

namespace OpenRA.Mods.RA.Widgets.Logic
{
	public enum IngameInfoPanel { AutoSelect, Map, Objectives, Debug }

	class GameInfoLogic
	{
		[ObjectCreator.UseCtor]
		public GameInfoLogic(Widget widget, World world, IngameInfoPanel activePanel)
		{
			var lp = world.LocalPlayer;
			var numTabs = 0;

			widget.IsVisible = () => activePanel != IngameInfoPanel.AutoSelect;

			// Objectives/Stats tab
			var iop = world.WorldActor.TraitsImplementing<IObjectivesPanel>().FirstOrDefault();
			if (lp != null && iop != null && iop.PanelName != null)
			{
				numTabs++;
				var objectivesTabButton = widget.Get<ButtonWidget>(string.Concat("BUTTON", numTabs.ToString()));
				objectivesTabButton.GetText = () => "Objectives";
				objectivesTabButton.IsVisible = () => lp != null && numTabs > 1;
				objectivesTabButton.OnClick = () => activePanel = IngameInfoPanel.Objectives;
				objectivesTabButton.IsHighlighted = () => activePanel == IngameInfoPanel.Objectives;

				var objectivesPanel = widget.Get<ContainerWidget>("OBJECTIVES_PANEL");
				objectivesPanel.IsVisible = () => activePanel == IngameInfoPanel.Objectives;

				Game.LoadWidget(world, iop.PanelName, objectivesPanel, new WidgetArgs());

				if (activePanel == IngameInfoPanel.AutoSelect)
					activePanel = IngameInfoPanel.Objectives;
			}

			// Briefing tab
			if (world.Map.CustomPreview != null)
			{
				numTabs++;
				var mapTabButton = widget.Get<ButtonWidget>(string.Concat("BUTTON", numTabs.ToString()));
				mapTabButton.Text = "Briefing";
				mapTabButton.IsVisible = () => numTabs > 1;
				mapTabButton.OnClick = () => activePanel = IngameInfoPanel.Map;
				mapTabButton.IsHighlighted = () => activePanel == IngameInfoPanel.Map;

				var mapPanel = widget.Get<ContainerWidget>("MAP_PANEL");
				mapPanel.IsVisible = () => activePanel == IngameInfoPanel.Map;

				Game.LoadWidget(world, "MAP_PANEL", mapPanel, new WidgetArgs());

				if (activePanel == IngameInfoPanel.AutoSelect)
					activePanel = IngameInfoPanel.Map;
			}

			// Debug/Cheats tab
			if (lp != null && world.LobbyInfo.GlobalSettings.AllowCheats)
			{
				numTabs++;
				var debugTabButton = widget.Get<ButtonWidget>(string.Concat("BUTTON", numTabs.ToString()));
				debugTabButton.Text = "Debug";
				debugTabButton.IsVisible = () => lp != null && world.LobbyInfo.GlobalSettings.AllowCheats && numTabs > 1;
				debugTabButton.OnClick = () => activePanel = IngameInfoPanel.Debug;
				debugTabButton.IsHighlighted = () => activePanel == IngameInfoPanel.Debug;

				var debugPanelContainer = widget.Get<ContainerWidget>("DEBUG_PANEL");
				debugPanelContainer.IsVisible = () => activePanel == IngameInfoPanel.Debug;

				Game.LoadWidget(world, "DEBUG_PANEL", debugPanelContainer, new WidgetArgs());

				if (activePanel == IngameInfoPanel.AutoSelect)
					activePanel = IngameInfoPanel.Debug;
			}

			// Handle empty space when tabs aren't displayed
			var titleText = widget.Get<LabelWidget>("TITLE");
			var titleTextNoTabs = widget.GetOrNull<LabelWidget>("TITLE_NO_TABS");

			titleText.IsVisible = () => numTabs > 1 || (numTabs == 1 && titleTextNoTabs == null);
			titleText.GetText = () => string.Concat(world.Map.Type, ": ", world.Map.Title);
			if (titleTextNoTabs != null)
			{
				titleTextNoTabs.IsVisible = () => numTabs == 1;
				titleTextNoTabs.GetText = () => string.Concat(world.Map.Type, ": ", world.Map.Title);
			}

			var bg = widget.Get<BackgroundWidget>("BACKGROUND");
			var bgNoTabs = widget.GetOrNull<BackgroundWidget>("BACKGROUND_NO_TABS");

			bg.IsVisible = () => numTabs > 1 || (numTabs == 1 && bgNoTabs == null);
			if (bgNoTabs != null)
				bgNoTabs.IsVisible = () => numTabs == 1;
		}
	}
}