#region Copyright & License Information
/*
 * Copyright (c) The OpenRA Developers and Contributors
 * 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.Collections.Generic;
using OpenRA.Traits;

namespace OpenRA.Mods.Common.Traits
{
	[TraitLocation(SystemActors.Player)]
	[Desc("Enables defined prerequisites at game start for all players if the checkbox is enabled.")]
	public class LobbyPrerequisiteCheckboxInfo : TraitInfo, ILobbyOptions, ITechTreePrerequisiteInfo
	{
		[FieldLoader.Require]
		[Desc("Internal id for this checkbox.")]
		public readonly string ID = null;

		[FluentReference]
		[FieldLoader.Require]
		[Desc("Display name for this checkbox.")]
		public readonly string Label = null;

		[FluentReference]
		[Desc("Description name for this checkbox.")]
		public readonly string Description = null;

		[Desc("Default value of the checkbox in the lobby.")]
		public readonly bool Enabled = false;

		[Desc("Prevent the checkbox from being changed from its default value.")]
		public readonly bool Locked = false;

		[Desc("Display the checkbox in the lobby.")]
		public readonly bool Visible = true;

		[Desc("Display order for the checkbox in the lobby.")]
		public readonly int DisplayOrder = 0;

		[FieldLoader.Require]
		[Desc("Prerequisites to grant when this checkbox is enabled.")]
		public readonly HashSet<string> Prerequisites = new();

		IEnumerable<string> ITechTreePrerequisiteInfo.Prerequisites(ActorInfo info) { return Prerequisites; }

		IEnumerable<LobbyOption> ILobbyOptions.LobbyOptions(MapPreview map)
		{
			yield return new LobbyBooleanOption(map, ID, Label, Description,
				Visible, DisplayOrder, Enabled, Locked);
		}

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

	public class LobbyPrerequisiteCheckbox : INotifyCreated, ITechTreePrerequisite
	{
		readonly LobbyPrerequisiteCheckboxInfo info;
		HashSet<string> prerequisites = new();

		public LobbyPrerequisiteCheckbox(LobbyPrerequisiteCheckboxInfo info)
		{
			this.info = info;
		}

		void INotifyCreated.Created(Actor self)
		{
			var enabled = self.World.LobbyInfo.GlobalSettings.OptionOrDefault(info.ID, info.Enabled);
			if (enabled)
				prerequisites = info.Prerequisites;
		}

		IEnumerable<string> ITechTreePrerequisite.ProvidesPrerequisites => prerequisites;
	}
}