/*
 * Copyright 2015 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 as published by
 * the Free Software Foundation; version 3.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY 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 TIMER_P_H
#define TIMER_P_H

#include <QtCore/QObject>
#include <QtCore/QPointer>
#include <QtCore/QTimer>

#include <UbuntuGestures/ubuntugesturesglobal.h>
#include <UbuntuGestures/private/timesource_p.h>

UG_NAMESPACE_BEGIN

/* Defines an interface for a Timer. */
class UBUNTUGESTURES_EXPORT AbstractTimer : public QObject
{
    Q_OBJECT
public:
    AbstractTimer(QObject *parent) : QObject(parent), m_isRunning(false) {}
    virtual int interval() const = 0;
    virtual void setInterval(int msecs) = 0;
    virtual void start() { m_isRunning = true; }
    virtual void stop() { m_isRunning = false; }
    bool isRunning() const { return m_isRunning; }
    virtual bool isSingleShot() const = 0;
    virtual void setSingleShot(bool value) = 0;
Q_SIGNALS:
    void timeout();
private:
    bool m_isRunning;
};

/* Essentially a QTimer wrapper */
class UBUNTUGESTURES_EXPORT Timer : public AbstractTimer
{
    Q_OBJECT
public:
    Timer(QObject *parent = nullptr);

    int interval() const override;
    void setInterval(int msecs) override;
    void start() override;
    void stop() override;
    bool isSingleShot() const override;
    void setSingleShot(bool value) override;
private:
    QTimer m_timer;
};

/* For tests */
class UBUNTUGESTURES_EXPORT FakeTimer : public AbstractTimer
{
    Q_OBJECT
public:
    FakeTimer(const SharedTimeSource &timeSource, QObject *parent = nullptr);

    void update();
    qint64 nextTimeoutTime() const { return m_nextTimeoutTime; }

    int interval() const override;
    void setInterval(int msecs) override;
    void start() override;
    bool isSingleShot() const override;
    void setSingleShot(bool value) override;
private:
    int m_interval;
    bool m_singleShot;
    SharedTimeSource m_timeSource;
    qint64 m_nextTimeoutTime;
};

class UBUNTUGESTURES_EXPORT AbstractTimerFactory
{
public:
    virtual ~AbstractTimerFactory() {}
    virtual AbstractTimer *createTimer(QObject *parent = nullptr) = 0;
};

class UBUNTUGESTURES_EXPORT TimerFactory : public AbstractTimerFactory
{
public:
    AbstractTimer *createTimer(QObject *parent = nullptr) override { return new Timer(parent); }
};

class UBUNTUGESTURES_EXPORT FakeTimerFactory : public AbstractTimerFactory
{
public:
    FakeTimerFactory();
    virtual ~FakeTimerFactory() {}

    void updateTime(qint64 msecsSinceReference);
    QSharedPointer<TimeSource> timeSource() { return m_timeSource; }

    AbstractTimer *createTimer(QObject *parent = nullptr) override;
    QList<QPointer<FakeTimer>> timers;
private:
    QSharedPointer<FakeTimeSource> m_timeSource;
};

UG_NAMESPACE_END

#endif // TIMER_P_H
