update-client/Common/ConfigHelper.h

#pragma once
#include <QJsonObject>
#include <QString>

class ConfigHelper
{
public:
    static ConfigHelper& instance();
    QString getValue(const QString& section, const QString& key) const;
    bool setValue(const QString& section, const QString& key, const QString& value);
    QString configPath() const;
    QString productConfigPath() const;
    QString stateLocation() const;
    QString installRoot() const;
    QString runtimeRoot() const;
    QString updateRoot() const;
    QString runtimeRelativePath() const;
    QString lastError() const;

private:
    ConfigHelper();
    bool loadProductConfig();
    bool migrateLegacyStateIfNeeded();
    bool initializeStateDefaults();
    QString stateStorageKey(const QString& key) const;
    QString stateValue(const QString& key) const;
    bool writeStateValue(const QString& key, const QString& value);
    static bool isMutableKey(const QString& key);

    QString m_productConfigPath;
    QString m_statePrefix;
    QJsonObject m_productConfig;
    QJsonObject m_initialState;
    QString m_error;
};