Split drawing and business logic of ChatOverlay

osu.Game.Tests/Visual/TestCaseChatLink.cs

@@ -15,6 +15,7 @@ using System.Linq;
 using NUnit.Framework;
 using osu.Game.Graphics.Containers;
 using osu.Game.Graphics.Sprites;
+using osu.Game.Online.API;
 using osu.Game.Overlays;
 
 namespace osu.Game.Tests.Visual
@@ -50,17 +51,14 @@ namespace osu.Game.Tests.Visual
         }
 
         [BackgroundDependencyLoader]
-        private void load(OsuColour colours)
+        private void load(OsuColour colours, IAPIProvider api)
         {
             linkColour = colours.Blue;
-            dependencies.Cache(new ChatOverlay
+            dependencies.Cache(new ChatOverlay());
-            {
+
-                AvailableChannels =
+            var chatManager = new ChatManager(Scheduler);
-                {
+            api.Register(chatManager);
-                    new ChannelChat { Name = "#english" },
+            dependencies.Cache(chatManager);
-                    new ChannelChat { Name = "#japanese" }
-                }
-            });
 
             testLinksGeneral();
             testEcho();

osu.Game/Graphics/Containers/LinkFlowContainer.cs

@@ -23,15 +23,15 @@ namespace osu.Game.Graphics.Containers
         public override bool HandleMouseInput => true;
 
         private OsuGame game;
-
+        private ChatManager chatManager;
         private Action showNotImplementedError;
 
         [BackgroundDependencyLoader(true)]
-        private void load(OsuGame game, NotificationOverlay notifications)
+        private void load(OsuGame game, NotificationOverlay notifications, ChatManager chatManager)
         {
             // will be null in tests
             this.game = game;
-
+            this.chatManager = chatManager;
             showNotImplementedError = () => notifications?.Post(new SimpleNotification
             {
                 Text = @"This link type is not yet supported!",
@@ -80,7 +80,9 @@ namespace osu.Game.Graphics.Containers
                                 game?.ShowBeatmapSet(setId);
                             break;
                         case LinkAction.OpenChannel:
-                            game?.OpenChannel(linkArgument);
+                            var channel = chatManager.AvailableChannels.FirstOrDefault(c => c.Name == linkArgument);
+                            if (channel != null)
+                                chatManager.CurrentChat.Value = channel;
                             break;
                         case LinkAction.OpenEditorTimestamp:
                         case LinkAction.JoinMultiplayerMatch:

osu.Game/Online/Chat/ChannelChat.cs

@@ -1,16 +1,11 @@
 // Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
-using System;
-using System.Collections.Generic;
-using System.Linq;
 using Newtonsoft.Json;
-using osu.Framework.Configuration;
-using osu.Framework.Lists;
 
 namespace osu.Game.Online.Chat
 {
-    public class ChannelChat
+    public class ChannelChat : ChatBase
     {
         [JsonProperty(@"name")]
         public string Name;
@@ -24,82 +19,13 @@ namespace osu.Game.Online.Chat
         [JsonProperty(@"channel_id")]
         public int Id;
 
-        public readonly SortedList<Message> Messages = new SortedList<Message>(Comparer<Message>.Default);
-
-        private readonly List<LocalEchoMessage> pendingMessages = new List<LocalEchoMessage>();
-
-        public Bindable<bool> Joined = new Bindable<bool>();
-
-        public bool ReadOnly => false;
-
-        public const int MAX_HISTORY = 300;
-
         [JsonConstructor]
         public ChannelChat()
         {
         }
 
-        public event Action<IEnumerable<Message>> NewMessagesArrived;
-        public event Action<LocalEchoMessage, Message> PendingMessageResolved;
-        public event Action<Message> MessageRemoved;
-
-        public void AddLocalEcho(LocalEchoMessage message)
-        {
-            pendingMessages.Add(message);
-            Messages.Add(message);
-
-            NewMessagesArrived?.Invoke(new[] { message });
-        }
-
-        public void AddNewMessages(params Message[] messages)
-        {
-            messages = messages.Except(Messages).ToArray();
-
-            Messages.AddRange(messages);
-
-            purgeOldMessages();
-
-            NewMessagesArrived?.Invoke(messages);
-        }
-
-        private void purgeOldMessages()
-        {
-            // never purge local echos
-            int messageCount = Messages.Count - pendingMessages.Count;
-            if (messageCount > MAX_HISTORY)
-                Messages.RemoveRange(0, messageCount - MAX_HISTORY);
-        }
-
-        /// <summary>
-        /// Replace or remove a message from the channel.
-        /// </summary>
-        /// <param name="echo">The local echo message (client-side).</param>
-        /// <param name="final">The response message, or null if the message became invalid.</param>
-        public void ReplaceMessage(LocalEchoMessage echo, Message final)
-        {
-            if (!pendingMessages.Remove(echo))
-                throw new InvalidOperationException("Attempted to remove echo that wasn't present");
-
-            Messages.Remove(echo);
-
-            if (final == null)
-            {
-                MessageRemoved?.Invoke(echo);
-                return;
-            }
-
-            if (Messages.Contains(final))
-            {
-                // message already inserted, so let's throw away this update.
-                // we may want to handle this better in the future, but for the time being api requests are single-threaded so order is assumed.
-                MessageRemoved?.Invoke(echo);
-                return;
-            }
-
-            Messages.Add(final);
-            PendingMessageResolved?.Invoke(echo, final);
-        }
-
         public override string ToString() => Name;
+        public override long ChatID => Id;
+        public override TargetType Target => TargetType.Channel;
     }
 }

osu.Game/Online/Chat/ChatBase.cs

@@ -0,0 +1,85 @@
+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using osu.Framework.Configuration;
+using osu.Framework.Lists;
+
+namespace osu.Game.Online.Chat
+{
+    public abstract class ChatBase
+    {
+        public const int MAX_HISTORY = 300;
+        public bool ReadOnly { get; } = false;
+        public abstract TargetType Target { get; }
+        public abstract long ChatID { get; }
+        public Bindable<bool> Joined = new Bindable<bool>();
+
+        public readonly SortedList<Message> Messages = new SortedList<Message>(Comparer<Message>.Default);
+        private readonly List<LocalEchoMessage> pendingMessages = new List<LocalEchoMessage>();
+
+        public event Action<IEnumerable<Message>> NewMessagesArrived;
+        public event Action<LocalEchoMessage, Message> PendingMessageResolved;
+        public event Action<Message> MessageRemoved;
+
+        public void AddLocalEcho(LocalEchoMessage message)
+        {
+            pendingMessages.Add(message);
+            Messages.Add(message);
+
+            NewMessagesArrived?.Invoke(new[] { message });
+        }
+
+        public void AddNewMessages(params Message[] messages)
+        {
+            messages = messages.Except(Messages).ToArray();
+
+            Messages.AddRange(messages);
+
+            purgeOldMessages();
+
+            NewMessagesArrived?.Invoke(messages);
+        }
+
+        private void purgeOldMessages()
+        {
+            // never purge local echos
+            int messageCount = Messages.Count - pendingMessages.Count;
+            if (messageCount > MAX_HISTORY)
+                Messages.RemoveRange(0, messageCount - MAX_HISTORY);
+        }
+
+        /// <summary>
+        /// Replace or remove a message from the chat.
+        /// </summary>
+        /// <param name="echo">The local echo message (client-side).</param>
+        /// <param name="final">The response message, or null if the message became invalid.</param>
+        public void ReplaceMessage(LocalEchoMessage echo, Message final)
+        {
+            if (!pendingMessages.Remove(echo))
+                throw new InvalidOperationException("Attempted to remove echo that wasn't present");
+
+            Messages.Remove(echo);
+
+            if (final == null)
+            {
+                MessageRemoved?.Invoke(echo);
+                return;
+            }
+
+            if (Messages.Contains(final))
+            {
+                // message already inserted, so let's throw away this update.
+                // we may want to handle this better in the future, but for the time being api requests are single-threaded so order is assumed.
+                MessageRemoved?.Invoke(echo);
+                return;
+            }
+
+            Messages.Add(final);
+            PendingMessageResolved?.Invoke(echo, final);
+        }
+
+    }
+}

osu.Game/Online/Chat/ChatManager.cs

@@ -0,0 +1,193 @@
+// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+using osu.Framework.Configuration;
+using osu.Framework.Extensions.IEnumerableExtensions;
+using osu.Framework.Logging;
+using osu.Framework.Threading;
+using osu.Game.Online.API;
+using osu.Game.Online.API.Requests;
+
+namespace osu.Game.Online.Chat
+{
+    /// <summary>
+    /// Manages everything chat related
+    /// </summary>
+    public sealed class ChatManager : IOnlineComponent
+    {
+        /// <summary>
+        /// The channels the player joins on startup
+        /// </summary>
+        private readonly string[] defaultChannels =
+        {
+            @"#lazer", @"#osu", @"#lobby"
+        };
+
+        /// <summary>
+        /// The currently opened chat
+        /// </summary>
+        public Bindable<ChatBase> CurrentChat { get; } = new Bindable<ChatBase>();
+        /// <summary>
+        /// The Channels the player has joined
+        /// </summary>
+        public ObservableCollection<ChannelChat> JoinedChannels { get; } = new ObservableCollection<ChannelChat>();
+        /// <summary>
+        /// The channels available for the player to join
+        /// </summary>
+        public ObservableCollection<ChannelChat> AvailableChannels { get; } = new ObservableCollection<ChannelChat>();
+
+        private APIAccess api;
+        private readonly Scheduler scheduler;
+        private ScheduledDelegate fetchMessagesScheduleder;
+        private GetChannelMessagesRequest fetchChannelMsgReq;
+        private long? lastChannelMsgId;
+
+        public ChatManager(Scheduler scheduler)
+        {
+            this.scheduler = scheduler ?? throw new ArgumentNullException(nameof(scheduler));
+            CurrentChat.ValueChanged += currentChatChanged;
+        }
+
+        private void currentChatChanged(ChatBase chatBase)
+        {
+            if (chatBase is ChannelChat channel && !JoinedChannels.Contains(channel))         
+                JoinedChannels.Add(channel);
+            
+        }
+
+        /// <summary>
+        /// Posts a message to the currently opened chat.
+        /// </summary>
+        /// <param name="text">The message text that is going to be posted</param>
+        /// <param name="isAction">Is true if the message is an action, e.g.: user is currently eating </param>
+        public void PostMessage(string text, bool isAction = false)
+        {
+            if (CurrentChat.Value == null)
+                return;
+
+            if (!api.IsLoggedIn)
+            {
+                CurrentChat.Value.AddNewMessages(new ErrorMessage("Please sign in to participate in chat!"));
+                return;
+            }
+
+            var message = new LocalEchoMessage
+            {
+                Sender = api.LocalUser.Value,
+                Timestamp = DateTimeOffset.Now,
+                TargetType = CurrentChat.Value.Target,
+                TargetId = CurrentChat.Value.ChatID,
+                IsAction = isAction,
+                Content = text
+            };
+
+            CurrentChat.Value.AddLocalEcho(message);
+
+            var req = new PostMessageRequest(message);
+            req.Failure += e => CurrentChat.Value?.ReplaceMessage(message, null);
+            req.Success += m => CurrentChat.Value?.ReplaceMessage(message, m);
+            api.Queue(req);
+        }
+
+        public void PostCommand(string text)
+        {
+            if (CurrentChat.Value == null)
+                return;
+
+            var parameters = text.Split(new[] { ' ' }, 2);
+            string command = parameters[0];
+            string content = parameters.Length == 2 ? parameters[1] : string.Empty;
+
+            switch (command)
+            {
+                case "me":
+                    if (string.IsNullOrWhiteSpace(content))
+                    {
+                        CurrentChat.Value.AddNewMessages(new ErrorMessage("Usage: /me [action]"));
+                        break;
+                    }
+                    PostMessage(content, true);
+                    break;
+
+                case "help":
+                    CurrentChat.Value.AddNewMessages(new InfoMessage("Supported commands: /help, /me [action]"));
+                    break;
+
+                default:
+                    CurrentChat.Value.AddNewMessages(new ErrorMessage($@"""/{command}"" is not supported! For a list of supported commands see /help"));
+                    break;
+            }
+        }
+
+        private void fetchNewMessages()
+        {
+            if (fetchChannelMsgReq == null)
+                fetchNewChannelMessages();
+        }
+
+        private void fetchNewChannelMessages()
+        {
+            fetchChannelMsgReq = new GetChannelMessagesRequest(JoinedChannels, lastChannelMsgId);
+
+            fetchChannelMsgReq.Success += messages =>
+            {
+                handleChannelMessages(messages);
+                lastChannelMsgId = messages.LastOrDefault()?.Id ?? lastChannelMsgId;
+                fetchChannelMsgReq = null;
+            };
+            fetchChannelMsgReq.Failure += exception => Logger.Error(exception, "Fetching channel messages failed.");
+
+            api.Queue(fetchChannelMsgReq);
+        }
+
+        private void handleChannelMessages(IEnumerable<Message> messages)
+        {
+            var channels = JoinedChannels.ToList();
+
+            foreach (var group in messages.GroupBy(m => m.TargetId))
+                channels.Find(c => c.Id == group.Key)?.AddNewMessages(group.ToArray());
+        }
+
+        private void initializeDefaultChannels()
+        {
+            var req = new ListChannelsRequest();
+
+            req.Success += channels =>
+            { 
+                channels.Where(channel => AvailableChannels.All(c => c.ChatID != channel.ChatID))
+                        .ForEach(channel => AvailableChannels.Add(channel));
+
+                channels.Where(channel => defaultChannels.Contains(channel.Name))
+                        .Where(channel => JoinedChannels.All(c => c.ChatID != channel.ChatID))
+                        .ForEach(channel => JoinedChannels.Add(channel));
+
+                fetchNewMessages();
+            };
+            req.Failure += error => Logger.Error(error, "Fetching channels failed");
+
+            api.Queue(req);
+        }
+
+        public void APIStateChanged(APIAccess api, APIState state)
+        {
+            this.api = api ?? throw new ArgumentNullException(nameof(api));
+
+            switch (state)
+            {
+                case APIState.Online:
+                    if (JoinedChannels.Count == 0)
+                        initializeDefaultChannels();
+                    fetchMessagesScheduleder = scheduler.AddDelayed(fetchNewMessages, 1000, true);
+                    break;
+                default:
+                    fetchChannelMsgReq?.Cancel();
+                    fetchMessagesScheduleder?.Cancel();
+                    break;
+            }
+        }
+    }
+}

osu.Game/Online/Chat/Message.cs

@@ -22,7 +22,7 @@ namespace osu.Game.Online.Chat
         public TargetType TargetType;
 
         [JsonProperty(@"target_id")]
-        public int TargetId;
+        public long TargetId;
 
         [JsonProperty(@"is_action")]
         public bool IsAction;

osu.Game/OsuGame.cs

@@ -29,6 +29,7 @@ using osu.Game.Overlays.Notifications;
 using osu.Game.Rulesets;
 using osu.Game.Screens.Play;
 using osu.Game.Input.Bindings;
+using osu.Game.Online.Chat;
 using osu.Game.Rulesets.Mods;
 using osu.Game.Skinning;
 using OpenTK.Graphics;
@@ -142,12 +143,6 @@ namespace osu.Game
 
         private ScheduledDelegate scoreLoad;
 
-        /// <summary>
-        /// Open chat to a channel matching the provided name, if present.
-        /// </summary>
-        /// <param name="channelName">The name of the channel.</param>
-        public void OpenChannel(string channelName) => chat.OpenChannel(chat.AvailableChannels.Find(c => c.Name == channelName));
-
         /// <summary>
         /// Show a beatmap set as an overlay.
         /// </summary>

osu.Game/OsuGameBase.cs

@@ -28,6 +28,7 @@ using osu.Game.Graphics.Textures;
 using osu.Game.Input;
 using osu.Game.Input.Bindings;
 using osu.Game.IO;
+using osu.Game.Online.Chat;
 using osu.Game.Rulesets;
 using osu.Game.Rulesets.Scoring;
 using osu.Game.Skinning;
@@ -112,6 +113,11 @@ namespace osu.Game
             dependencies.Cache(api);
             dependencies.CacheAs<IAPIProvider>(api);
 
+            var chatManager = new ChatManager(Scheduler);
+            api.Register(chatManager);
+
+            dependencies.Cache(chatManager);
+
             dependencies.Cache(RulesetStore = new RulesetStore(contextFactory));
             dependencies.Cache(FileStore = new FileStore(contextFactory, Host.Storage));
             dependencies.Cache(BeatmapManager = new BeatmapManager(Host.Storage, contextFactory, RulesetStore, api, Audio, Host));

osu.Game/Overlays/Chat/ChatLine.cs

@@ -81,6 +81,8 @@ namespace osu.Game.Overlays.Chat
             Padding = new MarginPadding { Left = padding, Right = padding };
         }
 
+        private ChatManager chatManager;
+
         private Message message;
         private OsuSpriteText username;
         private LinkFlowContainer contentFlow;
@@ -104,9 +106,9 @@ namespace osu.Game.Overlays.Chat
         }
 
         [BackgroundDependencyLoader(true)]
-        private void load(OsuColour colours, ChatOverlay chat)
+        private void load(OsuColour colours, ChatManager chatManager)
         {
-            this.chat = chat;
+            this.chatManager = chatManager;
             customUsernameColour = colours.ChatBlue;
         }
 
@@ -215,8 +217,6 @@ namespace osu.Game.Overlays.Chat
             FinishTransforms(true);
         }
 
-        private ChatOverlay chat;
-
         private void updateMessageContent()
         {
             this.FadeTo(message is LocalEchoMessage ? 0.4f : 1.0f, 500, Easing.OutQuint);
@@ -226,7 +226,7 @@ namespace osu.Game.Overlays.Chat
             username.Text = $@"{message.Sender.Username}" + (senderHasBackground || message.IsAction ? "" : ":");
 
             // remove non-existent channels from the link list
-            message.Links.RemoveAll(link => link.Action == LinkAction.OpenChannel && chat?.AvailableChannels.Any(c => c.Name == link.Argument) != true);
+            message.Links.RemoveAll(link => link.Action == LinkAction.OpenChannel && chatManager?.AvailableChannels.Any(c => c.Name == link.Argument) != true);
 
             contentFlow.Clear();
             contentFlow.AddLinks(message.DisplayContent, message.Links);

osu.Game/Overlays/Chat/DrawableChat.cs

@@ -15,15 +15,15 @@ using osu.Game.Online.Chat;
 
 namespace osu.Game.Overlays.Chat
 {
-    public class DrawableChannel : Container
+    public class DrawableChat : Container
     {
-        public readonly ChannelChat Channel;
+        public readonly ChatBase Chat;
         private readonly ChatLineContainer flow;
         private readonly ScrollContainer scroll;
 
-        public DrawableChannel(ChannelChat channel)
+        public DrawableChat(ChatBase chat)
         {
-            Channel = channel;
+            Chat = chat;
 
             RelativeSizeAxes = Axes.Both;
 
@@ -50,15 +50,15 @@ namespace osu.Game.Overlays.Chat
                 }
             };
 
-            Channel.NewMessagesArrived += newMessagesArrived;
+            Chat.NewMessagesArrived += newMessagesArrived;
-            Channel.MessageRemoved += messageRemoved;
+            Chat.MessageRemoved += messageRemoved;
-            Channel.PendingMessageResolved += pendingMessageResolved;
+            Chat.PendingMessageResolved += pendingMessageResolved;
         }
 
         [BackgroundDependencyLoader]
         private void load()
         {
-            newMessagesArrived(Channel.Messages);
+            newMessagesArrived(Chat.Messages);
         }
 
         protected override void LoadComplete()
@@ -71,15 +71,15 @@ namespace osu.Game.Overlays.Chat
         {
             base.Dispose(isDisposing);
 
-            Channel.NewMessagesArrived -= newMessagesArrived;
+            Chat.NewMessagesArrived -= newMessagesArrived;
-            Channel.MessageRemoved -= messageRemoved;
+            Chat.MessageRemoved -= messageRemoved;
-            Channel.PendingMessageResolved -= pendingMessageResolved;
+            Chat.PendingMessageResolved -= pendingMessageResolved;
         }
 
         private void newMessagesArrived(IEnumerable<Message> newMessages)
         {
-            // Add up to last Channel.MAX_HISTORY messages
+            // Add up to last ChatBase.MAX_HISTORY messages
-            var displayMessages = newMessages.Skip(Math.Max(0, newMessages.Count() - ChannelChat.MAX_HISTORY));
+            var displayMessages = newMessages.Skip(Math.Max(0, newMessages.Count() - ChatBase.MAX_HISTORY));
 
             flow.AddRange(displayMessages.Select(m => new ChatLine(m)));
 
@@ -89,7 +89,7 @@ namespace osu.Game.Overlays.Chat
                 scrollToEnd();
 
             var staleMessages = flow.Children.Where(c => c.LifetimeEnd == double.MaxValue).ToArray();
-            int count = staleMessages.Length - ChannelChat.MAX_HISTORY;
+            int count = staleMessages.Length - ChatBase.MAX_HISTORY;
 
             for (int i = 0; i < count; i++)
             {

osu.Game/Overlays/ChatOverlay.cs

@@ -1,10 +1,9 @@
 // Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
 // Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
 
-using System;
 using System.Collections.Generic;
+using System.Collections.Specialized;
 using System.Diagnostics;
-using System.Linq;
 using OpenTK;
 using OpenTK.Graphics;
 using osu.Framework.Allocation;
@@ -16,41 +15,36 @@ using osu.Framework.Graphics.Transforms;
 using osu.Framework.Graphics.UserInterface;
 using osu.Framework.Input;
 using osu.Framework.MathUtils;
-using osu.Framework.Threading;
 using osu.Game.Configuration;
 using osu.Game.Graphics;
 using osu.Game.Graphics.Containers;
 using osu.Game.Graphics.UserInterface;
 using osu.Game.Online.API;
-using osu.Game.Online.API.Requests;
 using osu.Game.Online.Chat;
 using osu.Game.Overlays.Chat;
 
 namespace osu.Game.Overlays
 {
-    public class ChatOverlay : OsuFocusedOverlayContainer, IOnlineComponent
+    public class ChatOverlay : OsuFocusedOverlayContainer
     {
         private const float textbox_height = 60;
         private const float channel_selection_min_height = 0.3f;
 
-        private ScheduledDelegate messageRequest;
+        private ChatManager chatManager;
 
-        private readonly Container<DrawableChannel> currentChannelContainer;
+        private readonly Container<DrawableChat> currentChannelContainer;
+        private readonly List<DrawableChat> loadedChannels = new List<DrawableChat>();
 
         private readonly LoadingAnimation loading;
 
         private readonly FocusedTextBox textbox;
 
-        private APIAccess api;
-
         private const int transition_length = 500;
 
         public const float DEFAULT_HEIGHT = 0.4f;
 
         public const float TAB_AREA_HEIGHT = 50;
 
-        private GetChannelMessagesRequest fetchReq;
-
         private readonly ChatTabControl channelTabs;
 
         private readonly Container chatContainer;
@@ -60,10 +54,10 @@ namespace osu.Game.Overlays
 
         public Bindable<double> ChatHeight { get; set; }
 
-        public List<ChannelChat> AvailableChannels { get; private set; } = new List<ChannelChat>();
         private readonly Container channelSelectionContainer;
         private readonly ChannelSelectionOverlay channelSelection;
 
+
         public override bool Contains(Vector2 screenSpacePos) => chatContainer.ReceiveMouseInputAt(screenSpacePos) || channelSelection.State == Visibility.Visible && channelSelection.ReceiveMouseInputAt(screenSpacePos);
 
         public ChatOverlay()
@@ -110,7 +104,7 @@ namespace osu.Game.Overlays
                                 {
                                     RelativeSizeAxes = Axes.Both,
                                 },
-                                currentChannelContainer = new Container<DrawableChannel>
+                                currentChannelContainer = new Container<DrawableChat>
                                 {
                                     RelativeSizeAxes = Axes.Both,
                                     Padding = new MarginPadding
@@ -163,7 +157,7 @@ namespace osu.Game.Overlays
                                 channelTabs = new ChatTabControl
                                 {
                                     RelativeSizeAxes = Axes.Both,
-                                    OnRequestLeave = removeChannel,
+                                    OnRequestLeave = channel => chatManager.JoinedChannels.Remove(channel),
                                 },
                             }
                         },
@@ -171,7 +165,7 @@ namespace osu.Game.Overlays
                 },
             };
 
-            channelTabs.Current.ValueChanged += newChannel => CurrentChannel = newChannel;
+            channelTabs.Current.ValueChanged += newChannel => chatManager.CurrentChat.Value = newChannel;
             channelTabs.ChannelSelectorActive.ValueChanged += value => channelSelection.State = value ? Visibility.Visible : Visibility.Hidden;
             channelSelection.StateChanged += state =>
             {
@@ -186,13 +180,97 @@ namespace osu.Game.Overlays
                 else
                     textbox.HoldFocus = true;
             };
+            channelSelection.OnRequestJoin = channel =>
+            {
+                if (!chatManager.JoinedChannels.Contains(channel))
+                    chatManager.JoinedChannels.Add(channel);
+            };
+            channelSelection.OnRequestLeave = channel => chatManager.JoinedChannels.Remove(channel);
+        }
+
+        private void availableChannelsChanged(object sender, NotifyCollectionChangedEventArgs args)
+        {
+            channelSelection.Sections = new[]
+            {
+                new ChannelSection
+                {
+                    Header = "All Channels",
+                    Channels = chatManager.AvailableChannels,
+                },
+            };
+        }
+
+        private void joinedChannelsChanged(object sender, NotifyCollectionChangedEventArgs args)
+        {
+            switch (args.Action)
+            {
+                case NotifyCollectionChangedAction.Add:
+                    foreach (ChannelChat newChannel in args.NewItems)
+                    {
+                        channelTabs.AddItem(newChannel);
+                        newChannel.Joined.Value = true;
+                        if (chatManager.CurrentChat.Value == null)
+                        {
+                            chatManager.CurrentChat.Value = newChannel;
+                        }
+                            
+                    }
+                    break;
+                case NotifyCollectionChangedAction.Remove:
+                    foreach (ChannelChat removedChannel in args.OldItems)
+                    { 
+                        channelTabs.RemoveItem(removedChannel);
+                        loadedChannels.Remove(loadedChannels.Find(c => c.Chat == removedChannel ));
+                        removedChannel.Joined.Value = false;
+                        if (chatManager.CurrentChat.Value == removedChannel)
+                            chatManager.CurrentChat.Value = null;
+                    }
+                    break;
+            }
+        }
+
+        private void currentChatChanged(ChatBase chat)
+        {
+            if (chat == null)
+            {
+                textbox.Current.Disabled = true;
+                currentChannelContainer.Clear(false);
+                return;
+            }
+
+            textbox.Current.Disabled = chat.ReadOnly;
+
+            if (chat is ChannelChat channelChat)
+                channelTabs.Current.Value = channelChat;
+
+            var loaded = loadedChannels.Find(d => d.Chat == chat);
+            if (loaded == null)
+            {
+                currentChannelContainer.FadeOut(500, Easing.OutQuint);
+                loading.Show();
+
+                loaded = new DrawableChat(chat);
+                loadedChannels.Add(loaded);
+                LoadComponentAsync(loaded, l =>
+                {
+                    loading.Hide();
+
+
+                    currentChannelContainer.Clear(false);
+                    currentChannelContainer.Add(loaded);
+                    currentChannelContainer.FadeIn(500, Easing.OutQuint);
+                });
+            }
+            else
+            {
+                currentChannelContainer.Clear(false);
+                currentChannelContainer.Add(loaded);
+            }
         }
 
         private double startDragChatHeight;
         private bool isDragging;
 
-        public void OpenChannel(ChannelChat channel) => addChannel(channel);
-
         protected override bool OnDragStart(InputState state)
         {
             isDragging = tabsArea.IsHovered;
@@ -229,19 +307,6 @@ namespace osu.Game.Overlays
             return base.OnDragEnd(state);
         }
 
-        public void APIStateChanged(APIAccess api, APIState state)
-        {
-            switch (state)
-            {
-                case APIState.Online:
-                    initializeChannels();
-                    break;
-                default:
-                    messageRequest?.Cancel();
-                    break;
-            }
-        }
-
         public override bool AcceptsFocus => true;
 
         protected override void OnFocus(InputState state)
@@ -270,10 +335,9 @@ namespace osu.Game.Overlays
         }
 
         [BackgroundDependencyLoader]
-        private void load(APIAccess api, OsuConfigManager config, OsuColour colours)
+        private void load(APIAccess api, OsuConfigManager config, OsuColour colours, ChatManager chatManager)
         {
-            this.api = api;
+            api.Register(chatManager);
-            api.Register(this);
 
             ChatHeight = config.GetBindable<double>(OsuSetting.ChatDisplayHeight);
             ChatHeight.ValueChanged += h =>
@@ -285,253 +349,27 @@ namespace osu.Game.Overlays
             ChatHeight.TriggerChange();
 
             chatBackground.Colour = colours.ChatBlue;
-        }
-
-        private long? lastMessageId;
-
-        private readonly List<ChannelChat> careChannels = new List<ChannelChat>();
-
-        private readonly List<DrawableChannel> loadedChannels = new List<DrawableChannel>();
-
-        private void initializeChannels()
-        {
             loading.Show();
 
-            messageRequest?.Cancel();
+            this.chatManager = chatManager;
-
+            chatManager.CurrentChat.ValueChanged += currentChatChanged;
-            ListChannelsRequest req = new ListChannelsRequest();
+            chatManager.JoinedChannels.CollectionChanged += joinedChannelsChanged;
-            req.Success += delegate (List<ChannelChat> channels)
+            chatManager.AvailableChannels.CollectionChanged += availableChannelsChanged;
-            {
-                AvailableChannels = channels;
-
-                Scheduler.Add(delegate
-                {
-                    addChannel(channels.Find(c => c.Name == @"#lazer"));
-                    addChannel(channels.Find(c => c.Name == @"#osu"));
-                    addChannel(channels.Find(c => c.Name == @"#lobby"));
-
-                    channelSelection.OnRequestJoin = addChannel;
-                    channelSelection.OnRequestLeave = removeChannel;
-                    channelSelection.Sections = new[]
-                    {
-                        new ChannelSection
-                        {
-                            Header = "All Channels",
-                            Channels = channels,
-                        },
-                    };
-                });
-
-                messageRequest = Scheduler.AddDelayed(fetchNewMessages, 1000, true);
-            };
-
-            api.Queue(req);
-        }
-
-        private ChannelChat currentChannel;
-
-        protected ChannelChat CurrentChannel
-        {
-            get
-            {
-                return currentChannel;
-            }
-
-            set
-            {
-                if (currentChannel == value) return;
-
-                if (value == null)
-                {
-                    currentChannel = null;
-                    textbox.Current.Disabled = true;
-                    currentChannelContainer.Clear(false);
-                    return;
-                }
-
-                currentChannel = value;
-
-                textbox.Current.Disabled = currentChannel.ReadOnly;
-                channelTabs.Current.Value = value;
-
-                var loaded = loadedChannels.Find(d => d.Channel == value);
-                if (loaded == null)
-                {
-                    currentChannelContainer.FadeOut(500, Easing.OutQuint);
-                    loading.Show();
-
-                    loaded = new DrawableChannel(currentChannel);
-                    loadedChannels.Add(loaded);
-                    LoadComponentAsync(loaded, l =>
-                    {
-                        if (currentChannel.Messages.Any())
-                            loading.Hide();
-
-                        currentChannelContainer.Clear(false);
-                        currentChannelContainer.Add(loaded);
-                        currentChannelContainer.FadeIn(500, Easing.OutQuint);
-                    });
-                }
-                else
-                {
-                    currentChannelContainer.Clear(false);
-                    currentChannelContainer.Add(loaded);
-                }
-            }
-        }
-
-        private void addChannel(ChannelChat channel)
-        {
-            if (channel == null) return;
-
-            // ReSharper disable once AccessToModifiedClosure
-            var existing = careChannels.Find(c => c.Id == channel.Id);
-
-            if (existing != null)
-            {
-                // if we already have this channel loaded, we don't want to make a second one.
-                channel = existing;
-            }
-            else
-            {
-                careChannels.Add(channel);
-                channelTabs.AddItem(channel);
-            }
-
-            // let's fetch a small number of messages to bring us up-to-date with the backlog.
-            fetchInitialMessages(channel);
-
-            if (CurrentChannel == null)
-                CurrentChannel = channel;
-
-            channel.Joined.Value = true;
-        }
-
-        private void removeChannel(ChannelChat channel)
-        {
-            if (channel == null) return;
-
-            if (channel == CurrentChannel) CurrentChannel = null;
-
-            careChannels.Remove(channel);
-            loadedChannels.Remove(loadedChannels.Find(c => c.Channel == channel));
-            channelTabs.RemoveItem(channel);
-
-            channel.Joined.Value = false;
-        }
-
-        private void fetchInitialMessages(ChannelChat channel)
-        {
-            var req = new GetChannelMessagesRequest(new List<ChannelChat> { channel }, null);
-
-            req.Success += delegate (List<Message> messages)
-            {
-                loading.Hide();
-                channel.AddNewMessages(messages.ToArray());
-                Debug.Write("success!");
-            };
-            req.Failure += delegate
-            {
-                Debug.Write("failure!");
-            };
-
-            api.Queue(req);
-        }
-
-        private void fetchNewMessages()
-        {
-            if (fetchReq != null) return;
-
-            fetchReq = new GetChannelMessagesRequest(careChannels, lastMessageId);
-
-            fetchReq.Success += delegate (List<Message> messages)
-            {
-                foreach (var group in messages.Where(m => m.TargetType == TargetType.Channel).GroupBy(m => m.TargetId))
-                    careChannels.Find(c => c.Id == group.Key)?.AddNewMessages(group.ToArray());
-
-                lastMessageId = messages.LastOrDefault()?.Id ?? lastMessageId;
-
-                Debug.Write("success!");
-                fetchReq = null;
-            };
-
-            fetchReq.Failure += delegate
-            {
-                Debug.Write("failure!");
-                fetchReq = null;
-            };
-
-            api.Queue(fetchReq);
         }
 
         private void postMessage(TextBox textbox, bool newText)
         {
-            var postText = textbox.Text;
+            var text = textbox.Text.Trim();
+
+            if (string.IsNullOrWhiteSpace(text))
+                return;
+
+            if (text[0] == '/')
+                chatManager.PostCommand(text.Substring(1));
+            else
+                chatManager.PostMessage(text);
 
             textbox.Text = string.Empty;
-
-            if (string.IsNullOrWhiteSpace(postText))
-                return;
-
-            var target = currentChannel;
-
-            if (target == null) return;
-
-            if (!api.IsLoggedIn)
-            {
-                target.AddNewMessages(new ErrorMessage("Please sign in to participate in chat!"));
-                return;
-            }
-
-            bool isAction = false;
-
-            if (postText[0] == '/')
-            {
-                string[] parameters = postText.Substring(1).Split(new[] { ' ' }, 2);
-                string command = parameters[0];
-                string content = parameters.Length == 2 ? parameters[1] : string.Empty;
-
-                switch (command)
-                {
-                    case "me":
-
-                        if (string.IsNullOrWhiteSpace(content))
-                        {
-                            currentChannel.AddNewMessages(new ErrorMessage("Usage: /me [action]"));
-                            return;
-                        }
-
-                        isAction = true;
-                        postText = content;
-                        break;
-
-                    case "help":
-                        currentChannel.AddNewMessages(new InfoMessage("Supported commands: /help, /me [action]"));
-                        return;
-
-                    default:
-                        currentChannel.AddNewMessages(new ErrorMessage($@"""/{command}"" is not supported! For a list of supported commands see /help"));
-                        return;
-                }
-            }
-
-            var message = new LocalEchoMessage
-            {
-                Sender = api.LocalUser.Value,
-                Timestamp = DateTimeOffset.Now,
-                TargetType = TargetType.Channel, //TODO: read this from channel
-                TargetId = target.Id,
-                IsAction = isAction,
-                Content = postText
-            };
-
-            var req = new PostMessageRequest(message);
-
-            target.AddLocalEcho(message);
-            req.Failure += e => target.ReplaceMessage(message, null);
-            req.Success += m => target.ReplaceMessage(message, m);
-
-            api.Queue(req);
         }
 
         private void transformChatHeightTo(double newChatHeight, double duration = 0, Easing easing = Easing.None)