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/models/serverlistmodel.h

@@ -0,0 +1,116 @@
+// SPDX-FileCopyrightText: 2022 James Graham <james.h.graham@protonmail.com>
+// SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+
+#pragma once
+
+#include <Quotient/csapi/list_public_rooms.h>
+
+#include <QAbstractListModel>
+#include <QPointer>
+#include <QQmlEngine>
+#include <QUrl>
+
+class NeoChatConnection;
+
+/**
+ * @class ServerListModel
+ *
+ * This class defines the model for visualising a list of matrix servers.
+ *
+ * The list of servers is retrieved from the local cache. Any additions are also
+ * stored locally so that they are retrieved on subsequent instantiations.
+ *
+ * The model also automatically adds the local user's home server and matrix.org to
+ * the model. Finally the model also adds an entry to create a space in the model
+ * for an "add new server" delegate.
+ */
+class ServerListModel : public QAbstractListModel
+{
+    Q_OBJECT
+    QML_ELEMENT
+
+    Q_PROPERTY(NeoChatConnection *connection READ connection WRITE setConnection NOTIFY connectionChanged)
+
+public:
+    /**
+     * @brief Define the data required to represent a server.
+     */
+    struct Server {
+        QString url; /**< Server URL. */
+        bool isHomeServer; /**< Whether the server is the local user's home server. */
+        bool isAddServerDelegate; /**< Wether the item is the "add new server" delegate. */
+        bool isDeletable; /**< Whether the item can be deleted from the model. */
+    };
+
+    /**
+     * @brief Defines the model roles.
+     */
+    enum EventRoles {
+        UrlRole = Qt::UserRole + 1, /**< Server URL. */
+        IsHomeServerRole, /**< Whether the server is the local user's home server. */
+        IsAddServerDelegateRole, /**< Whether the item is the add new server delegate. */
+        IsDeletableRole, /**< Whether the item can be deleted from the model. */
+    };
+
+    explicit ServerListModel(QObject *parent = nullptr);
+
+    /**
+     * @brief Get the given role value at the given index.
+     *
+     * @sa QAbstractItemModel::data
+     */
+    [[nodiscard]] QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
+
+    /**
+     * @brief Number of rows in the model.
+     *
+     * @sa QAbstractItemModel::rowCount
+     */
+    [[nodiscard]] int rowCount(const QModelIndex &parent = QModelIndex()) const override;
+
+    /**
+     * @brief Returns a mapping from Role enum values to role names.
+     *
+     * @sa EventRoles, QAbstractItemModel::roleNames()
+     */
+    [[nodiscard]] QHash<int, QByteArray> roleNames() const override;
+
+    /**
+     * @brief Start a check to see if the given URL is a valid matrix server.
+     *
+     * This function starts the check but due to the requests being asynchronous
+     * the caller will need to watch the serverCheckComplete signal for confirmation.
+     * The server URL should be treated as invalid until the signal is emitted true.
+     *
+     * @sa serverCheckComplete()
+     */
+    Q_INVOKABLE void checkServer(const QString &url);
+
+    /**
+     * @brief Add a new server to the model.
+     *
+     * The server will also be stored in local cache.
+     */
+    Q_INVOKABLE void addServer(const QString &url);
+
+    /**
+     * @brief Remove the server at the given index.
+     *
+     * The server will also be removed from local cache.
+     */
+    Q_INVOKABLE void removeServerAtIndex(int index);
+
+    NeoChatConnection *connection() const;
+    void setConnection(NeoChatConnection *connection);
+
+Q_SIGNALS:
+    void serverCheckComplete(QString url, bool valid);
+    void connectionChanged();
+
+private:
+    QList<Server> m_servers;
+    QPointer<Quotient::QueryPublicRoomsJob> m_checkServerJob = nullptr;
+    QPointer<NeoChatConnection> m_connection;
+
+    void initialize();
+};