Move remaining code to app module

There's still some stuff that could potentially go elsewhere but I think it's enough for now.

src/app/controller.h

@@ -0,0 +1,134 @@
+// SPDX-FileCopyrightText: 2018-2019 Black Hat <bhat@encom.eu.org>
+// SPDX-License-Identifier: GPL-3.0-only
+
+#pragma once
+
+#include <QObject>
+#include <QQmlEngine>
+
+#include "accountmanager.h"
+#include "neochatconnection.h"
+#include "notificationsmanager.h"
+#include <Quotient/accountregistry.h>
+
+class TrayIcon;
+
+namespace QKeychain
+{
+class ReadPasswordJob;
+}
+
+/**
+ * @class Controller
+ *
+ * A singleton class designed to help manage the application.
+ *
+ * There are also a bunch of helper functions that currently don't fit anywhere
+ * else.
+ */
+class Controller : public QObject
+{
+    Q_OBJECT
+    QML_ELEMENT
+    QML_SINGLETON
+
+    /**
+     * @brief The current connection for the rest of NeoChat to use.
+     */
+    Q_PROPERTY(NeoChatConnection *activeConnection READ activeConnection WRITE setActiveConnection NOTIFY activeConnectionChanged)
+
+    /**
+     * @brief Whether the OS NeoChat is running on supports sytem tray icons.
+     */
+    Q_PROPERTY(bool supportSystemTray READ supportSystemTray CONSTANT)
+
+    /**
+     * @brief Whether NeoChat is running as a flatpak.
+     *
+     * This is the only way to gate NeoChat features in flatpaks in QML.
+     */
+    Q_PROPERTY(bool isFlatpak READ isFlatpak CONSTANT)
+
+    Q_PROPERTY(QStringList accountsLoading READ accountsLoading NOTIFY accountsLoadingChanged)
+
+public:
+    static Controller &instance();
+    static Controller *create(QQmlEngine *engine, QJSEngine *)
+    {
+        engine->setObjectOwnership(&instance(), QQmlEngine::CppOwnership);
+        return &instance();
+    }
+
+    void setAccountManager(AccountManager *manager);
+
+    [[nodiscard]] NeoChatConnection *activeConnection() const;
+    void setActiveConnection(NeoChatConnection *connection);
+
+    QStringList accountsLoading() const;
+
+    [[nodiscard]] bool supportSystemTray() const;
+
+    bool isFlatpak() const;
+
+    /**
+     * @brief Start listening for notifications in dbus-activated mode.
+     * These notifications will quit the application when closed.
+     */
+    static void listenForNotifications();
+
+    /**
+     * @brief Clear an existing invite notification for the given room.
+     *
+     * Nothing happens if the given room doesn't have an invite notification.
+     */
+    Q_INVOKABLE void clearInvitationNotification(const QString &roomId);
+
+    Q_INVOKABLE QString loadFileContent(const QString &path) const;
+
+    Quotient::AccountRegistry *accounts();
+
+    Q_INVOKABLE void removeConnection(const QString &userId);
+
+    /**
+     * @brief Revert all configuration values to their default.
+     *
+     * The parameters along with their defaults are specified in the config file
+     * neochatconfig.kcfg.
+     */
+    Q_INVOKABLE void revertToDefaultConfig();
+
+    Q_INVOKABLE bool isImageShown(const QString &eventId);
+    Q_INVOKABLE void markImageShown(const QString &eventId);
+
+private:
+    explicit Controller(QObject *parent = nullptr);
+
+    QPointer<AccountManager> m_accountManager;
+    void initConnection(NeoChatConnection *connection);
+    void teardownConnection(NeoChatConnection *connection);
+    void initActiveConnection(NeoChatConnection *oldConnection, NeoChatConnection *newConnection);
+
+    QPointer<NeoChatConnection> m_connection;
+    TrayIcon *m_trayIcon = nullptr;
+
+    QString m_endpoint;
+    QStringList m_shownImages;
+
+    NotificationsManager m_notificationsManager;
+
+private Q_SLOTS:
+    void setQuitOnLastWindowClosed();
+    void updateBadgeNotificationCount(int count);
+
+Q_SIGNALS:
+    /**
+     * @brief Request a error message be shown to the user.
+     */
+    void errorOccured(const QString &error);
+    void connectionAdded(NeoChatConnection *connection);
+    void connectionDropped(NeoChatConnection *connection);
+    void activeConnectionChanged(NeoChatConnection *connection);
+    void accountsLoadingChanged();
+
+    void globalUrlPreviewDefaultChanged();
+};