feat: Add Live Emote Updates for BTTV (#4147)

This feature is enabled by default and can be disabled in settings with the "Enable BTTV live emotes updates" setting.

Co-authored-by: Felanbird <41973452+Felanbird@users.noreply.github.com>
Co-authored-by: pajlada <rasmus.karlsson@pajlada.com>

src/providers/bttv/BttvLiveUpdates.cpp

@@ -0,0 +1,92 @@
+#include "providers/bttv/BttvLiveUpdates.hpp"
+
+#include <QJsonDocument>
+
+#include <utility>
+
+namespace chatterino {
+
+BttvLiveUpdates::BttvLiveUpdates(QString host)
+    : BasicPubSubManager(std::move(host))
+{
+}
+
+void BttvLiveUpdates::joinChannel(const QString &channelID,
+                                  const QString &userName)
+{
+    if (this->joinedChannels_.insert(channelID).second)
+    {
+        this->subscribe({BttvLiveUpdateSubscriptionChannel{channelID}});
+        this->subscribe({BttvLiveUpdateBroadcastMe{.twitchID = channelID,
+                                                   .userName = userName}});
+    }
+}
+
+void BttvLiveUpdates::partChannel(const QString &id)
+{
+    if (this->joinedChannels_.erase(id) > 0)
+    {
+        this->unsubscribe({BttvLiveUpdateSubscriptionChannel{id}});
+    }
+}
+
+void BttvLiveUpdates::onMessage(
+    websocketpp::connection_hdl /*hdl*/,
+    BasicPubSubManager<BttvLiveUpdateSubscription>::WebsocketMessagePtr msg)
+{
+    const auto &payload = QString::fromStdString(msg->get_payload());
+    QJsonDocument jsonDoc(QJsonDocument::fromJson(payload.toUtf8()));
+
+    if (jsonDoc.isNull())
+    {
+        qCDebug(chatterinoBttv) << "Failed to parse live update JSON";
+        return;
+    }
+    auto json = jsonDoc.object();
+
+    auto eventType = json["name"].toString();
+    auto eventData = json["data"].toObject();
+
+    if (eventType == "emote_create")
+    {
+        auto message = BttvLiveUpdateEmoteUpdateAddMessage(eventData);
+
+        if (!message.validate())
+        {
+            qCDebug(chatterinoBttv) << "Invalid add message" << json;
+            return;
+        }
+
+        this->signals_.emoteAdded.invoke(message);
+    }
+    else if (eventType == "emote_update")
+    {
+        auto message = BttvLiveUpdateEmoteUpdateAddMessage(eventData);
+
+        if (!message.validate())
+        {
+            qCDebug(chatterinoBttv) << "Invalid update message" << json;
+            return;
+        }
+
+        this->signals_.emoteUpdated.invoke(message);
+    }
+    else if (eventType == "emote_delete")
+    {
+        auto message = BttvLiveUpdateEmoteRemoveMessage(eventData);
+
+        if (!message.validate())
+        {
+            qCDebug(chatterinoBttv) << "Invalid deletion message" << json;
+            return;
+        }
+
+        this->signals_.emoteRemoved.invoke(message);
+    }
+    else
+    {
+        qCDebug(chatterinoBttv) << "Unhandled event:" << json;
+    }
+}
+
+}  // namespace chatterino