/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
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** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
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****************************************************************************/

#pragma once

#include "core_global.h"

#include <QObject>
#include <QString>
#include <QStringList>
#include <QVariant>

namespace Core {

namespace Internal { class SettingsDatabasePrivate; }

class CORE_EXPORT SettingsDatabase : public QObject
{
public:
    SettingsDatabase(const QString &path, const QString &application, QObject *parent = nullptr);
    ~SettingsDatabase() override;

    void setValue(const QString &key, const QVariant &value);
    QVariant value(const QString &key, const QVariant &defaultValue = QVariant()) const;

    template<typename T>
    void setValueWithDefault(const QString &key, const T &val, const T &defaultValue);
    template<typename T>
    void setValueWithDefault(const QString &key, const T &val);

    bool contains(const QString &key) const;
    void remove(const QString &key);

    void beginGroup(const QString &prefix);
    void endGroup();
    QString group() const;
    QStringList childKeys() const;

    void beginTransaction();
    void endTransaction();

    void sync();

private:
    Internal::SettingsDatabasePrivate *d;
};

template<typename T>
void SettingsDatabase::setValueWithDefault(const QString &key, const T &val, const T &defaultValue)
{
    if (val == defaultValue)
        remove(key);
    else
        setValue(key, QVariant::fromValue(val));
}

template<typename T>
void SettingsDatabase::setValueWithDefault(const QString &key, const T &val)
{
    if (val == T())
        remove(key);
    else
        setValue(key, QVariant::fromValue(val));
}

} // namespace Core
