/*
 * Copyright (C) 2016 Canonical, Ltd.
 *
 * This program is free software: you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License version 3, as published by
 * the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranties of MERCHANTABILITY,
 * SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef UNITY_SCREENS_H
#define UNITY_SCREENS_H

#include <QAbstractListModel>
#include <QSharedPointer>
#include <QPointer>

namespace qtmir
{
class Screen;
class Screens;
}

class Screen;
class ProxyScreens;

class Screens : public QAbstractListModel
{
    Q_OBJECT
    Q_PROPERTY(int count READ count NOTIFY countChanged)
    Q_PROPERTY(QVariant activeScreen READ activeScreen WRITE activateScreen NOTIFY activeScreenChanged)

public:
    enum ItemRoles {
        ScreenRole = Qt::UserRole + 1
    };

    ~Screens();

    /* QAbstractItemModel */
    QHash<int, QByteArray> roleNames() const override;
    QVariant data(const QModelIndex &index, int role = ScreenRole) const override;
    int rowCount(const QModelIndex &parent = QModelIndex()) const override;

    int count() const;
    QVariant activeScreen() const;

    bool isSyncing() const { return m_syncing; }

    const QVector<Screen*>& list() const { return m_screens; }

public Q_SLOTS:
    void activateScreen(const QVariant& index);

Q_SIGNALS:
    void countChanged();
    void activeScreenChanged();

    void screenAdded(Screen* screen);
    void screenRemoved(Screen* screen);

protected:
    Screens(const QSharedPointer<qtmir::Screens>& model);

    QVector<Screen*> m_screens;
    const QSharedPointer<qtmir::Screens> m_wrapped;
    bool m_syncing;

    friend class ProxyScreens;
};

class ConcreteScreens : public Screens
{
    Q_OBJECT
public:
    explicit ConcreteScreens(const QSharedPointer<qtmir::Screens>& model);

    Q_INVOKABLE ProxyScreens *createProxy();
    Q_INVOKABLE void sync(Screens *proxy);

    static ConcreteScreens *self();

protected Q_SLOTS:
    void onScreenAdded(qtmir::Screen *screen);
    void onScreenRemoved(qtmir::Screen *screen);

private:
    static ConcreteScreens* m_self;
};

class ProxyScreens : public Screens
{
public:
    explicit ProxyScreens(Screens*const screens);

private:
    const QPointer<Screens> m_original;
};

#endif // SCREENS_H