/*
 * Copyright (C) 2015 Jolla Ltd.
 * Contact: Thomas Perl <thomas.perl@jolla.com>
 *
 * You may use this file under the terms of the BSD license as follows:
 *
 * "Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *   * Neither the name of Nemo Mobile nor the names of its contributors
 *     may be used to endorse or promote products derived from this
 *     software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 */

#ifndef DISKUSAGE_H
#define DISKUSAGE_H

#include <QObject>
#include <QVariant>
#include <QJSValue>
#include <QScopedPointer>

#include <systemsettingsglobal.h>

class DiskUsagePrivate;

class SYSTEMSETTINGS_EXPORT DiskUsage : public QObject
{
    Q_OBJECT
    Q_DECLARE_PRIVATE(DiskUsage)

    // True while calculation takes place
    Q_PROPERTY(bool working READ working NOTIFY workingChanged)

    Q_PROPERTY(QVariantMap result READ result NOTIFY resultChanged)

public:
    explicit DiskUsage(QObject *parent=0);
    virtual ~DiskUsage();

    // Calculate the disk usage of the given paths, then call
    // callback with a QVariantMap (mapping paths to usages in bytes)
    Q_INVOKABLE void calculate(const QStringList &paths, QJSValue callback);

    QVariantMap result() const;

signals:
    void workingChanged();
    void resultChanged();

signals:
    void submit(QStringList paths, QJSValue *callback);

private slots:
    void finished(QVariantMap usage, QJSValue *callback);

private:
    bool working() const { return m_working; }

    void setWorking(bool working) {
        if (m_working != working) {
            m_working = working;
            emit workingChanged();
        }
    }

private:
    QScopedPointer<DiskUsagePrivate> const d_ptr;
    QVariantMap m_result;
    bool m_working;
};

#endif /* DISKUSAGE_H */