configstorage.cc

#include <QDebug>
#include <QStandardPaths>
#include <QCoreApplication>
#include <QDir>

#include "configstorage.h"

#define CHECK_INTERVAL 300

//-------------------------------------------------------------------------------------------------
ConfigStorage::ConfigStorage()
    : mConfigFile(nullptr)
{
    connect(&mWatchTimer, &QTimer::timeout, this, &ConfigStorage::checkConfigUpdate);
}

//-------------------------------------------------------------------------------------------------
bool ConfigStorage::init()
{
    Q_ASSERT(!mConfigFile); // call init only once

    QString cfgPath = QStandardPaths::writableLocation(QStandardPaths::ConfigLocation)
            + "/" + qApp->applicationName();

    if (!QDir(cfgPath).mkpath(cfgPath)) {
        qWarning() << "Failed to create path" << cfgPath;
        return false;
    }

    cfgPath.append("/config.json");
    mConfigFile = new QFile(cfgPath);
    bool useDefaults = !mConfigFile->exists() || mConfigFile->size() == 0;

    if (!mConfigFile->open(QIODevice::ReadWrite)) {
        qWarning() << "Could not open" << cfgPath << "with read/write mode";
        return false;
    }

    if (useDefaults)
        revertToDefaults();

    updateConfig();
    mWatchTimer.start(CHECK_INTERVAL);

    return true;
}

//-------------------------------------------------------------------------------------------------
void ConfigStorage::checkConfigUpdate()
{
    Q_ASSERT(mConfigFile);

    if (QFileInfo(*mConfigFile).lastModified() > mLastUpdate)
        updateConfig();
}

//-------------------------------------------------------------------------------------------------
void ConfigStorage::updateConfig()
{
    Q_ASSERT(mConfigFile->isOpen());

    mLastUpdate = QDateTime::currentDateTime();
    qDebug() << "update config";
}

//-------------------------------------------------------------------------------------------------
void ConfigStorage::revertToDefaults()
{
    Q_ASSERT(mConfigFile && mConfigFile->isOpen()); // call init first

    QFile defaults(":/config/install/default.json");
    Q_ASSERT(defaults.exists());
    bool open = defaults.open(QIODevice::ReadOnly);
    Q_ASSERT(open);

    mConfigFile->write(defaults.readAll());
    mConfigFile->flush();
}