WaterLevelSensor/configinterface.cpp

#include "configinterface.h"

#include <fstream>
#include <sstream>
#include <filesystem>

ConfigInterface::ConfigInterface(QObject *parent)
    : QObject{parent}
{
}

QString ConfigInterface::fileName() const
{
    return m_fileName;
}

void ConfigInterface::setFileName(const QString &newFileName)
{
    if (m_fileName == newFileName)
        return;
    m_fileName = newFileName;
    std::fstream input(newFileName.toStdString(), std::fstream::in);
    if(!input.is_open()) {
        return;
    }
    std::string data;
    std::string temp;
    while(std::getline(input, temp)) {
        data += temp;
    }
    input.flush();
    input.close();
    QByteArray arr_data(data);
    QJsonDocument doc = QJsonDocument::fromJson(arr_data);
    // The following works even the qml part is not initailzed/connected
    // do not change back to just emit config()
    QMetaObject::invokeMethod(this, &ConfigInterface::config, Qt::QueuedConnection, doc.object());
    emit fileNameChanged();
}

void ConfigInterface::deleteConfig()
{
    std::filesystem::remove(std::filesystem::path(m_fileName.toStdString()));
    emit configDeleted();
}

void ConfigInterface::saveConfig(QJsonObject config)
{
    QJsonDocument doc;
    doc.setObject(config);
    std::string data = doc.toJson().toStdString();
    std::fstream output(m_fileName.toStdString(), std::fstream::out);
    if(!output.is_open()) {
        return;
    }
    output << data;
    output.flush();
    output.close();
    QMetaObject::invokeMethod(this, &ConfigInterface::config, Qt::QueuedConnection, doc.object());
}