OpenRA/OpenRA.Mods.Common/Widgets/Logic/Lobby/LobbyLogic.cs

#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;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Threading.Tasks;
using OpenRA.Graphics;
using OpenRA.Network;
using OpenRA.Traits;
using OpenRA.Widgets;

namespace OpenRA.Mods.Common.Widgets.Logic
{
	public class LobbyLogic : ChromeLogic
	{
		static readonly Action DoNothing = () => { };

		readonly ModData modData;
		readonly Action onStart;
		readonly Action onExit;
		readonly OrderManager orderManager;
		readonly WorldRenderer worldRenderer;
		readonly bool skirmishMode;
		readonly Ruleset modRules;
		readonly World shellmapWorld;
		readonly WebServices services;

		enum PanelType { Players, Options, Music, Servers, Kick, ForceStart }
		PanelType panel = PanelType.Players;

		readonly Widget lobby;
		readonly Widget editablePlayerTemplate;
		readonly Widget nonEditablePlayerTemplate;
		readonly Widget emptySlotTemplate;
		readonly Widget editableSpectatorTemplate;
		readonly Widget nonEditableSpectatorTemplate;
		readonly Widget newSpectatorTemplate;

		readonly ScrollPanelWidget lobbyChatPanel;
		readonly Widget chatTemplate;

		readonly ScrollPanelWidget players;

		readonly Dictionary<string, LobbyFaction> factions = new Dictionary<string, LobbyFaction>();

		readonly ColorPreviewManagerWidget colorPreview;

		readonly TabCompletionLogic tabCompletion = new TabCompletionLogic();

		readonly LabelWidget chatLabel;

		MapPreview map;
		bool addBotOnMapLoad;
		bool teamChat;

		readonly string chatLineSound = ChromeMetrics.Get<string>("ChatLineSound");

		// Listen for connection failures
		void ConnectionStateChanged(OrderManager om)
		{
			if (om.Connection.ConnectionState == ConnectionState.NotConnected)
			{
				// Show connection failed dialog
				Ui.CloseWindow();

				Action onConnect = () =>
				{
					Game.OpenWindow("SERVER_LOBBY", new WidgetArgs()
					{
						{ "onExit", onExit },
						{ "onStart", onStart },
						{ "skirmishMode", false }
					});
				};

				Action<string> onRetry = password => ConnectionLogic.Connect(om.Host, om.Port, password, onConnect, onExit);

				var switchPanel = om.ServerExternalMod != null ? "CONNECTION_SWITCHMOD_PANEL" : "CONNECTIONFAILED_PANEL";
				Ui.OpenWindow(switchPanel, new WidgetArgs()
				{
					{ "orderManager", om },
					{ "onAbort", onExit },
					{ "onRetry", onRetry }
				});
			}
		}

		[ObjectCreator.UseCtor]
		internal LobbyLogic(Widget widget, ModData modData, WorldRenderer worldRenderer, OrderManager orderManager,
			Action onExit, Action onStart, bool skirmishMode, Dictionary<string, MiniYaml> logicArgs)
		{
			map = MapCache.UnknownMap;
			lobby = widget;
			this.modData = modData;
			this.orderManager = orderManager;
			this.worldRenderer = worldRenderer;
			this.onStart = onStart;
			this.onExit = onExit;
			this.skirmishMode = skirmishMode;

			// TODO: This needs to be reworked to support per-map tech levels, bots, etc.
			this.modRules = modData.DefaultRules;
			shellmapWorld = worldRenderer.World;

			services = modData.Manifest.Get<WebServices>();

			orderManager.AddChatLine += AddChatLine;
			Game.LobbyInfoChanged += UpdateCurrentMap;
			Game.LobbyInfoChanged += UpdatePlayerList;
			Game.BeforeGameStart += OnGameStart;
			Game.ConnectionStateChanged += ConnectionStateChanged;

			var name = lobby.GetOrNull<LabelWidget>("SERVER_NAME");
			if (name != null)
				name.GetText = () => orderManager.LobbyInfo.GlobalSettings.ServerName;

			var mapContainer = Ui.LoadWidget("MAP_PREVIEW", lobby.Get("MAP_PREVIEW_ROOT"), new WidgetArgs
			{
				{ "orderManager", orderManager },
				{ "getMap", (Func<MapPreview>)(() => map) },
				{ "onMouseDown",  (Action<MapPreviewWidget, MapPreview, MouseInput>)((preview, mapPreview, mi) =>
					LobbyUtils.SelectSpawnPoint(orderManager, preview, mapPreview, mi)) },
				{ "getSpawnOccupants", (Func<MapPreview, Dictionary<CPos, SpawnOccupant>>)(mapPreview => LobbyUtils.GetSpawnOccupants(orderManager.LobbyInfo, mapPreview)) },
				{ "showUnoccupiedSpawnpoints", true },
			});

			mapContainer.IsVisible = () => panel != PanelType.Servers;

			UpdateCurrentMap();

			var playerBin = Ui.LoadWidget("LOBBY_PLAYER_BIN", lobby.Get("TOP_PANELS_ROOT"), new WidgetArgs());
			playerBin.IsVisible = () => panel == PanelType.Players;

			players = playerBin.Get<ScrollPanelWidget>("LOBBY_PLAYERS");
			editablePlayerTemplate = players.Get("TEMPLATE_EDITABLE_PLAYER");
			nonEditablePlayerTemplate = players.Get("TEMPLATE_NONEDITABLE_PLAYER");
			emptySlotTemplate = players.Get("TEMPLATE_EMPTY");
			editableSpectatorTemplate = players.Get("TEMPLATE_EDITABLE_SPECTATOR");
			nonEditableSpectatorTemplate = players.Get("TEMPLATE_NONEDITABLE_SPECTATOR");
			newSpectatorTemplate = players.Get("TEMPLATE_NEW_SPECTATOR");
			colorPreview = lobby.Get<ColorPreviewManagerWidget>("COLOR_MANAGER");
			colorPreview.Color = Game.Settings.Player.Color;

			foreach (var f in modRules.Actors["world"].TraitInfos<FactionInfo>())
				factions.Add(f.InternalName, new LobbyFaction { Selectable = f.Selectable, Name = f.Name, Side = f.Side, Description = f.Description });

			var gameStarting = false;
			Func<bool> configurationDisabled = () => !Game.IsHost || gameStarting ||
				panel == PanelType.Kick || panel == PanelType.ForceStart ||
				!map.RulesLoaded || map.InvalidCustomRules ||
				orderManager.LocalClient == null || orderManager.LocalClient.IsReady;

			var mapButton = lobby.GetOrNull<ButtonWidget>("CHANGEMAP_BUTTON");
			if (mapButton != null)
			{
				mapButton.IsVisible = () => panel != PanelType.Servers;
				mapButton.IsDisabled = () => gameStarting || panel == PanelType.Kick || panel == PanelType.ForceStart ||
					orderManager.LocalClient == null || orderManager.LocalClient.IsReady;
				mapButton.OnClick = () =>
				{
					var onSelect = new Action<string>(uid =>
					{
						// Don't select the same map again
						if (uid == map.Uid)
							return;

						orderManager.IssueOrder(Order.Command("map " + uid));
						Game.Settings.Server.Map = uid;
						Game.Settings.Save();
					});

					Ui.OpenWindow("MAPCHOOSER_PANEL", new WidgetArgs()
					{
						{ "initialMap", map.Uid },
						{ "initialTab", MapClassification.System },
						{ "onExit", DoNothing },
						{ "onSelect", Game.IsHost ? onSelect : null },
						{ "filter", MapVisibility.Lobby },
					});
				};
			}

			var slotsButton = lobby.GetOrNull<DropDownButtonWidget>("SLOTS_DROPDOWNBUTTON");
			if (slotsButton != null)
			{
				slotsButton.IsVisible = () => panel != PanelType.Servers;
				slotsButton.IsDisabled = () => configurationDisabled() || panel != PanelType.Players ||
					(orderManager.LobbyInfo.Slots.Values.All(s => !s.AllowBots) &&
					orderManager.LobbyInfo.Slots.Count(s => !s.Value.LockTeam && orderManager.LobbyInfo.ClientInSlot(s.Key) != null) == 0);

				slotsButton.OnMouseDown = _ =>
				{
					var botTypes = map.Rules.Actors["player"].TraitInfos<IBotInfo>().Select(t => t.Type);
					var options = new Dictionary<string, IEnumerable<DropDownOption>>();

					var botController = orderManager.LobbyInfo.Clients.FirstOrDefault(c => c.IsAdmin);
					if (orderManager.LobbyInfo.Slots.Values.Any(s => s.AllowBots))
					{
						var botOptions = new List<DropDownOption>()
						{
							new DropDownOption()
							{
								Title = "Add",
								IsSelected = () => false,
								OnClick = () =>
								{
									foreach (var slot in orderManager.LobbyInfo.Slots)
									{
										var bot = botTypes.Random(Game.CosmeticRandom);
										var c = orderManager.LobbyInfo.ClientInSlot(slot.Key);
										if (slot.Value.AllowBots == true && (c == null || c.Bot != null))
											orderManager.IssueOrder(Order.Command("slot_bot {0} {1} {2}".F(slot.Key, botController.Index, bot)));
									}
								}
							}
						};

						if (orderManager.LobbyInfo.Clients.Any(c => c.Bot != null))
						{
							botOptions.Add(new DropDownOption()
							{
								Title = "Remove",
								IsSelected = () => false,
								OnClick = () =>
								{
									foreach (var slot in orderManager.LobbyInfo.Slots)
									{
										var c = orderManager.LobbyInfo.ClientInSlot(slot.Key);
										if (c != null && c.Bot != null)
											orderManager.IssueOrder(Order.Command("slot_open " + slot.Value.PlayerReference));
									}
								}
							});
						}

						options.Add("Configure Bots", botOptions);
					}

					var teamCount = (orderManager.LobbyInfo.Slots.Count(s => !s.Value.LockTeam && orderManager.LobbyInfo.ClientInSlot(s.Key) != null) + 1) / 2;
					if (teamCount >= 1)
					{
						var teamOptions = Enumerable.Range(2, teamCount - 1).Reverse().Select(d => new DropDownOption
						{
							Title = "{0} Teams".F(d),
							IsSelected = () => false,
							OnClick = () => orderManager.IssueOrder(Order.Command("assignteams {0}".F(d.ToString())))
						}).ToList();

						if (orderManager.LobbyInfo.Slots.Any(s => s.Value.AllowBots))
						{
							teamOptions.Add(new DropDownOption
							{
								Title = "Humans vs Bots",
								IsSelected = () => false,
								OnClick = () => orderManager.IssueOrder(Order.Command("assignteams 1"))
							});
						}

						teamOptions.Add(new DropDownOption
						{
							Title = "Free for all",
							IsSelected = () => false,
							OnClick = () => orderManager.IssueOrder(Order.Command("assignteams 0"))
						});

						options.Add("Configure Teams", teamOptions);
					}

					Func<DropDownOption, ScrollItemWidget, ScrollItemWidget> setupItem = (option, template) =>
					{
						var item = ScrollItemWidget.Setup(template, option.IsSelected, option.OnClick);
						item.Get<LabelWidget>("LABEL").GetText = () => option.Title;
						return item;
					};
					slotsButton.ShowDropDown("LABEL_DROPDOWN_TEMPLATE", 175, options, setupItem);
				};
			}

			var optionsBin = Ui.LoadWidget("LOBBY_OPTIONS_BIN", lobby.Get("TOP_PANELS_ROOT"), new WidgetArgs()
			{
				{ "orderManager", orderManager },
				{ "getMap", (Func<MapPreview>)(() => map) },
				{ "configurationDisabled", configurationDisabled }
			});

			optionsBin.IsVisible = () => panel == PanelType.Options;

			var musicBin = Ui.LoadWidget("LOBBY_MUSIC_BIN", lobby.Get("TOP_PANELS_ROOT"), new WidgetArgs
			{
				{ "onExit", DoNothing },
				{ "world", worldRenderer.World }
			});
			musicBin.IsVisible = () => panel == PanelType.Music;

			ServerListLogic serverListLogic = null;
			if (!skirmishMode)
			{
				Action<GameServer> doNothingWithServer = _ => { };

				var serversBin = Ui.LoadWidget("LOBBY_SERVERS_BIN", lobby.Get("TOP_PANELS_ROOT"), new WidgetArgs
				{
					{ "onJoin", doNothingWithServer },
				});

				serverListLogic = serversBin.LogicObjects.Select(l => l as ServerListLogic).FirstOrDefault(l => l != null);
				serversBin.IsVisible = () => panel == PanelType.Servers;
			}

			var tabContainer = skirmishMode ? lobby.Get("SKIRMISH_TABS") : lobby.Get("MULTIPLAYER_TABS");
			tabContainer.IsVisible = () => true;

			var optionsTab = tabContainer.Get<ButtonWidget>("OPTIONS_TAB");
			optionsTab.IsHighlighted = () => panel == PanelType.Options;
			optionsTab.IsDisabled = OptionsTabDisabled;
			optionsTab.OnClick = () => panel = PanelType.Options;
			optionsTab.GetText = () => !map.RulesLoaded ? "Loading..." : optionsTab.Text;

			var playersTab = tabContainer.Get<ButtonWidget>("PLAYERS_TAB");
			playersTab.IsHighlighted = () => panel == PanelType.Players;
			playersTab.IsDisabled = () => panel == PanelType.Kick || panel == PanelType.ForceStart;
			playersTab.OnClick = () => panel = PanelType.Players;

			var musicTab = tabContainer.Get<ButtonWidget>("MUSIC_TAB");
			musicTab.IsHighlighted = () => panel == PanelType.Music;
			musicTab.IsDisabled = () => panel == PanelType.Kick || panel == PanelType.ForceStart;
			musicTab.OnClick = () => panel = PanelType.Music;

			var serversTab = tabContainer.GetOrNull<ButtonWidget>("SERVERS_TAB");
			if (serversTab != null)
			{
				serversTab.IsHighlighted = () => panel == PanelType.Servers;
				serversTab.IsDisabled = () => panel == PanelType.Kick || panel == PanelType.ForceStart;
				serversTab.OnClick = () =>
				{
					// Refresh the list when switching to the servers tab
					if (serverListLogic != null && panel != PanelType.Servers)
						serverListLogic.RefreshServerList();

					panel = PanelType.Servers;
				};
			}

			// Force start panel
			Action startGame = () =>
			{
				gameStarting = true;
				orderManager.IssueOrder(Order.Command("startgame"));
			};

			var startGameButton = lobby.GetOrNull<ButtonWidget>("START_GAME_BUTTON");
			if (startGameButton != null)
			{
				startGameButton.IsDisabled = () => configurationDisabled() || map.Status != MapStatus.Available ||
					orderManager.LobbyInfo.Slots.Any(sl => sl.Value.Required && orderManager.LobbyInfo.ClientInSlot(sl.Key) == null) ||
					(!orderManager.LobbyInfo.GlobalSettings.EnableSingleplayer && orderManager.LobbyInfo.NonBotPlayers.Count() < 2);

				startGameButton.OnClick = () =>
				{
					// Bots and admins don't count
					if (orderManager.LobbyInfo.Clients.Any(c => c.Slot != null && !c.IsAdmin && c.Bot == null && !c.IsReady))
						panel = PanelType.ForceStart;
					else
						startGame();
				};
			}

			var forceStartBin = Ui.LoadWidget("FORCE_START_DIALOG", lobby.Get("TOP_PANELS_ROOT"), new WidgetArgs());
			forceStartBin.IsVisible = () => panel == PanelType.ForceStart;
			forceStartBin.Get("KICK_WARNING").IsVisible = () => orderManager.LobbyInfo.Clients.Any(c => c.IsInvalid);
			forceStartBin.Get<ButtonWidget>("OK_BUTTON").OnClick = startGame;
			forceStartBin.Get<ButtonWidget>("CANCEL_BUTTON").OnClick = () => panel = PanelType.Players;

			var disconnectButton = lobby.Get<ButtonWidget>("DISCONNECT_BUTTON");
			disconnectButton.OnClick = () => { Ui.CloseWindow(); onExit(); };

			if (skirmishMode)
				disconnectButton.Text = "Back";

			chatLabel = lobby.Get<LabelWidget>("LABEL_CHATTYPE");
			var chatTextField = lobby.Get<TextFieldWidget>("CHAT_TEXTFIELD");
			chatTextField.MaxLength = UnitOrders.ChatMessageMaxLength;

			chatTextField.TakeKeyboardFocus();
			chatTextField.OnEnterKey = () =>
			{
				if (chatTextField.Text.Length == 0)
					return true;

				// Always scroll to bottom when we've typed something
				lobbyChatPanel.ScrollToBottom();

				orderManager.IssueOrder(Order.Chat(teamChat, chatTextField.Text));
				chatTextField.Text = "";
				return true;
			};

			chatTextField.OnTabKey = () =>
			{
				var previousText = chatTextField.Text;
				chatTextField.Text = tabCompletion.Complete(chatTextField.Text);
				chatTextField.CursorPosition = chatTextField.Text.Length;

				if (chatTextField.Text == previousText)
					return SwitchTeamChat();
				else
					return true;
			};

			chatTextField.OnEscKey = () => { chatTextField.Text = ""; return true; };

			lobbyChatPanel = lobby.Get<ScrollPanelWidget>("CHAT_DISPLAY");
			chatTemplate = lobbyChatPanel.Get("CHAT_TEMPLATE");
			lobbyChatPanel.RemoveChildren();

			var settingsButton = lobby.GetOrNull<ButtonWidget>("SETTINGS_BUTTON");
			if (settingsButton != null)
			{
				settingsButton.OnClick = () => Ui.OpenWindow("SETTINGS_PANEL", new WidgetArgs
				{
					{ "onExit", DoNothing },
					{ "worldRenderer", worldRenderer }
				});
			}

			// Add a bot on the first lobbyinfo update
			if (skirmishMode)
				addBotOnMapLoad = true;

			MiniYaml yaml;
			if (logicArgs.TryGetValue("ChatLineSound", out yaml))
				chatLineSound = yaml.Value;
		}

		bool disposed;
		protected override void Dispose(bool disposing)
		{
			if (disposing && !disposed)
			{
				disposed = true;
				orderManager.AddChatLine -= AddChatLine;
				Game.LobbyInfoChanged -= UpdateCurrentMap;
				Game.LobbyInfoChanged -= UpdatePlayerList;
				Game.BeforeGameStart -= OnGameStart;
				Game.ConnectionStateChanged -= ConnectionStateChanged;
			}

			base.Dispose(disposing);
		}

		bool OptionsTabDisabled()
		{
			return !map.RulesLoaded || map.InvalidCustomRules || panel == PanelType.Kick || panel == PanelType.ForceStart;
		}

		public override void Tick()
		{
			if (panel == PanelType.Options && OptionsTabDisabled())
				panel = PanelType.Players;
		}

		void AddChatLine(Color c, string from, string text)
		{
			var template = (ContainerWidget)chatTemplate.Clone();
			LobbyUtils.SetupChatLine(template, c, DateTime.Now, from, text);

			var scrolledToBottom = lobbyChatPanel.ScrolledToBottom;
			lobbyChatPanel.AddChild(template);
			if (scrolledToBottom)
				lobbyChatPanel.ScrollToBottom(smooth: true);

			Game.Sound.PlayNotification(modRules, null, "Sounds", chatLineSound, null);
		}

		bool SwitchTeamChat()
		{
			teamChat ^= true;
			chatLabel.Text = teamChat ? "Team:" : "Chat:";
			return true;
		}

		void LoadMapPreviewRules(MapPreview map)
		{
			new Task(() =>
			{
				// Force map rules to be loaded on this background thread
				map.PreloadRules();
			}).Start();
		}

		void UpdateCurrentMap()
		{
			var uid = orderManager.LobbyInfo.GlobalSettings.Map;
			if (map.Uid == uid)
				return;

			map = modData.MapCache[uid];
			if (map.Status == MapStatus.Available)
			{
				// Maps need to be validated and pre-loaded before they can be accessed
				var currentMap = map;
				new Task(() =>
				{
					// Force map rules to be loaded on this background thread
					currentMap.PreloadRules();
					Game.RunAfterTick(() =>
					{
						// Map may have changed in the meantime
						if (currentMap != map)
							return;

						// Tell the server that we have the map
						if (!currentMap.InvalidCustomRules)
							orderManager.IssueOrder(Order.Command("state {0}".F(Session.ClientState.NotReady)));

						if (addBotOnMapLoad)
						{
							var slot = orderManager.LobbyInfo.FirstEmptyBotSlot();
							var bot = currentMap.Rules.Actors["player"].TraitInfos<IBotInfo>().Select(t => t.Type).FirstOrDefault();
							var botController = orderManager.LobbyInfo.Clients.FirstOrDefault(c => c.IsAdmin);
							if (slot != null && bot != null)
								orderManager.IssueOrder(Order.Command("slot_bot {0} {1} {2}".F(slot, botController.Index, bot)));

							addBotOnMapLoad = false;
						}
					});
				}).Start();
			}
			else if (map.Status == MapStatus.DownloadAvailable)
				LoadMapPreviewRules(map);
			else if (Game.Settings.Game.AllowDownloading)
				modData.MapCache.QueryRemoteMapDetails(services.MapRepository, new[] { uid }, LoadMapPreviewRules);
		}

		void UpdatePlayerList()
		{
			if (orderManager.LocalClient == null)
				return;

			var isHost = Game.IsHost;
			var idx = 0;
			foreach (var kv in orderManager.LobbyInfo.Slots)
			{
				var key = kv.Key;
				var slot = kv.Value;
				var client = orderManager.LobbyInfo.ClientInSlot(key);
				Widget template = null;

				// get template for possible reuse
				if (idx < players.Children.Count)
					template = players.Children[idx];

				if (client == null)
				{
					// Empty slot
					if (template == null || template.Id != emptySlotTemplate.Id)
						template = emptySlotTemplate.Clone();

					if (isHost)
						LobbyUtils.SetupEditableSlotWidget(template, slot, client, orderManager, worldRenderer, map);
					else
						LobbyUtils.SetupSlotWidget(template, slot, client);

					var join = template.Get<ButtonWidget>("JOIN");
					join.IsVisible = () => !slot.Closed;
					join.IsDisabled = () => orderManager.LocalClient.IsReady;
					join.OnClick = () => orderManager.IssueOrder(Order.Command("slot " + key));
				}
				else if ((client.Index == orderManager.LocalClient.Index) ||
						 (client.Bot != null && isHost))
				{
					// Editable player in slot
					if (template == null || template.Id != editablePlayerTemplate.Id)
						template = editablePlayerTemplate.Clone();

					LobbyUtils.SetupLatencyWidget(template, client, orderManager);

					if (client.Bot != null)
						LobbyUtils.SetupEditableSlotWidget(template, slot, client, orderManager, worldRenderer, map);
					else
						LobbyUtils.SetupEditableNameWidget(template, slot, client, orderManager, worldRenderer);

					LobbyUtils.SetupEditableColorWidget(template, slot, client, orderManager, shellmapWorld, colorPreview);
					LobbyUtils.SetupEditableFactionWidget(template, slot, client, orderManager, factions);
					LobbyUtils.SetupEditableTeamWidget(template, slot, client, orderManager, map);
					LobbyUtils.SetupEditableSpawnWidget(template, slot, client, orderManager, map);
					LobbyUtils.SetupEditableReadyWidget(template, slot, client, orderManager, map);
				}
				else
				{
					// Non-editable player in slot
					if (template == null || template.Id != nonEditablePlayerTemplate.Id)
						template = nonEditablePlayerTemplate.Clone();

					LobbyUtils.SetupLatencyWidget(template, client, orderManager);
					LobbyUtils.SetupColorWidget(template, slot, client);
					LobbyUtils.SetupFactionWidget(template, slot, client, factions);

					if (isHost)
					{
						LobbyUtils.SetupEditableTeamWidget(template, slot, client, orderManager, map);
						LobbyUtils.SetupEditableSpawnWidget(template, slot, client, orderManager, map);
						LobbyUtils.SetupPlayerActionWidget(template, slot, client, orderManager, worldRenderer,
							lobby, () => panel = PanelType.Kick, () => panel = PanelType.Players);
					}
					else
					{
						LobbyUtils.SetupNameWidget(template, slot, client, orderManager, worldRenderer);
						LobbyUtils.SetupTeamWidget(template, slot, client);
						LobbyUtils.SetupSpawnWidget(template, slot, client);
					}

					LobbyUtils.SetupReadyWidget(template, slot, client);
				}

				template.IsVisible = () => true;

				if (idx >= players.Children.Count)
					players.AddChild(template);
				else if (players.Children[idx].Id != template.Id)
					players.ReplaceChild(players.Children[idx], template);

				idx++;
			}

			// Add spectators
			foreach (var client in orderManager.LobbyInfo.Clients.Where(client => client.Slot == null))
			{
				Widget template = null;
				var c = client;

				// get template for possible reuse
				if (idx < players.Children.Count)
					template = players.Children[idx];

				// Editable spectator
				if (c.Index == orderManager.LocalClient.Index)
				{
					if (template == null || template.Id != editableSpectatorTemplate.Id)
						template = editableSpectatorTemplate.Clone();

					LobbyUtils.SetupEditableNameWidget(template, null, c, orderManager, worldRenderer);

					if (client.IsAdmin)
						LobbyUtils.SetupEditableReadyWidget(template, null, client, orderManager, map);
					else
						LobbyUtils.HideReadyWidgets(template);
				}
				else
				{
					// Non-editable spectator
					if (template == null || template.Id != nonEditableSpectatorTemplate.Id)
						template = nonEditableSpectatorTemplate.Clone();

					if (isHost)
						LobbyUtils.SetupPlayerActionWidget(template, null, client, orderManager, worldRenderer,
							lobby, () => panel = PanelType.Kick, () => panel = PanelType.Players);
					else
						LobbyUtils.SetupNameWidget(template, null, client, orderManager, worldRenderer);

					if (client.IsAdmin)
						LobbyUtils.SetupReadyWidget(template, null, client);
					else
						LobbyUtils.HideReadyWidgets(template);
				}

				LobbyUtils.SetupLatencyWidget(template, c, orderManager);
				template.IsVisible = () => true;

				if (idx >= players.Children.Count)
					players.AddChild(template);
				else if (players.Children[idx].Id != template.Id)
					players.ReplaceChild(players.Children[idx], template);

				idx++;
			}

			// Spectate button
			if (orderManager.LocalClient.Slot != null)
			{
				Widget spec = null;
				if (idx < players.Children.Count)
					spec = players.Children[idx];
				if (spec == null || spec.Id != newSpectatorTemplate.Id)
					spec = newSpectatorTemplate.Clone();

				LobbyUtils.SetupKickSpectatorsWidget(spec, orderManager, lobby,
					() => panel = PanelType.Kick, () => panel = PanelType.Players, skirmishMode);

				var btn = spec.Get<ButtonWidget>("SPECTATE");
				btn.OnClick = () => orderManager.IssueOrder(Order.Command("spectate"));
				btn.IsDisabled = () => orderManager.LocalClient.IsReady;
				btn.IsVisible = () => orderManager.LobbyInfo.GlobalSettings.AllowSpectators
					|| orderManager.LocalClient.IsAdmin;

				spec.IsVisible = () => true;

				if (idx >= players.Children.Count)
					players.AddChild(spec);
				else if (players.Children[idx].Id != spec.Id)
					players.ReplaceChild(players.Children[idx], spec);

				idx++;
			}

			while (players.Children.Count > idx)
				players.RemoveChild(players.Children[idx]);

			tabCompletion.Names = orderManager.LobbyInfo.Clients.Select(c => c.Name).Distinct().ToList();
		}

		void OnGameStart()
		{
			Ui.CloseWindow();
			onStart();
		}
	}

	public class LobbyFaction
	{
		public bool Selectable;
		public string Name;
		public string Description;
		public string Side;
	}

	class DropDownOption
	{
		public string Title;
		public Func<bool> IsSelected = () => false;
		public Action OnClick;
	}
}