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****************************************************************************/

#ifndef QBS_SETTINGS_H
#define QBS_SETTINGS_H

#include "qbs_export.h"

#include <QtCore/qstring.h>
#include <QtCore/qstringlist.h>
#include <QtCore/qvariant.h>

#include <memory>

QT_BEGIN_NAMESPACE
class QSettings;
QT_END_NAMESPACE

namespace qbs {

class QBS_EXPORT Settings
{
public:
    // The "pure" base directory without any version scope. Empty string means "system default".
    Settings(const QString &baseDir);
    Settings(const QString &baseDir, const QString &systemBaseDir);

    ~Settings();

    enum Scope { UserScope = 0x1, SystemScope = 0x2 };
    Q_DECLARE_FLAGS(Scopes, Scope)
    static Scopes allScopes() { return {UserScope, SystemScope}; }

    QVariant value(const QString &key, Scopes scopes,
                   const QVariant &defaultValue = QVariant()) const;
    QStringList allKeys(Scopes scopes) const;
    QStringList directChildren(const QString &parentGroup, Scope scope) const; // Keys and groups.
    QStringList allKeysWithPrefix(const QString &group, Scopes scopes) const;
    void setValue(const QString &key, const QVariant &value);
    void remove(const QString &key);
    void clear();
    void sync();

    void setScopeForWriting(Scope scope) { m_scopeForWriting = scope; }
    Scope scopeForWriting() const { return m_scopeForWriting; }

    QString defaultProfile() const;
    QStringList profiles() const;

    QString fileName() const;
    QString baseDirectory() const { return m_baseDir; } // As passed into the constructor.

    static QString defaultSystemSettingsBaseDir();

private:
    QString internalRepresentation(const QString &externalKey) const;
    QString externalRepresentation(const QString &internalKey) const;
    void fixupKeys(QStringList &keys) const;
    QSettings *settingsForScope(Scope scope) const;
    QSettings *targetForWriting() const;
    void checkForWriteError();

    const std::unique_ptr<QSettings> m_settings;
    const std::unique_ptr<QSettings> m_systemSettings;
    const QString m_baseDir;
    Scope m_scopeForWriting = UserScope;
};

Q_DECLARE_OPERATORS_FOR_FLAGS(Settings::Scopes)

} // namespace qbs

#endif // QBS_SETTINGS_H
