#include "persistence/PersistentBinaryObject.h"

#include <QDataStream>
#include <QDir>
#include <QFile>
#include <QFileInfo>

namespace core {

bool PersistentBinaryObject::saveToFile(const QString& absolutePath) const {
    if (absolutePath.isEmpty()) {
        return false;
    }
    const auto parent = QFileInfo(absolutePath).absolutePath();
    if (!QFileInfo(parent).exists()) {
        QDir().mkpath(parent);
    }

    const QString tmpPath = absolutePath + QStringLiteral(".tmp");
    QFile f(tmpPath);
    if (!f.open(QIODevice::WriteOnly | QIODevice::Truncate)) {
        return false;
    }

    QDataStream ds(&f);
    ds.setVersion(QDataStream::Qt_5_15);
    ds << quint32(recordMagic()) << quint32(recordFormatVersion());
    writeBody(ds);

    f.close();
    if (f.error() != QFile::NoError) {
        QFile::remove(tmpPath);
        return false;
    }
    QFile::remove(absolutePath);
    return QFile::rename(tmpPath, absolutePath);
}

bool PersistentBinaryObject::loadFromFile(const QString& absolutePath) {
    QFile f(absolutePath);
    if (!f.open(QIODevice::ReadOnly)) {
        return false;
    }

    QDataStream ds(&f);
    ds.setVersion(QDataStream::Qt_5_15);

    quint32 magic = 0;
    quint32 version = 0;
    ds >> magic >> version;
    if (ds.status() != QDataStream::Ok || magic != recordMagic() || version != recordFormatVersion()) {
        return false;
    }
    return readBody(ds);
}

}  // namespace core