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#pragma once
// qt
#include <QDebug>
#include <QDir>
#include <QFile>
#include <QFileSystemWatcher>
#include <QJsonDocument>
#include <QJsonObject>
#include <QMutex>
#include <QSharedPointer>
#include <QStandardPaths>
#include <QVariant>
#define JSON_OBJECT_FILE(classname) JsonObjectFile<classname>::get().data()
template <class T> class JsonObjectFile
{
public:
static QSharedPointer<T> get()
{
static QMutex mtx;
QMutexLocker l(&mtx);
if (!m_instance)
{
m_instance = read();
qDebug() << "add filepath" << filepath();
if (!m_watcher.addPath(filepath()))
{
qt_noop();
}
qDebug() << m_watcher.directories() << m_watcher.files();
QObject::connect(
&m_watcher,
&QFileSystemWatcher::directoryChanged,
&m_watcher,
[&](const QString& path) {
qDebug() << filepath() << "changed";
if (path == filename())
{
qDebug() << "file changed:" << filename();
*get() = *read();
}
},
Qt::DirectConnection
);
}
return m_instance;
}
static QSharedPointer<T> read(const QString fileName = QString())
{
static QMutex mtx;
QMutexLocker l(&mtx);
if (!QDir(filepath()).exists())
{
QDir().mkpath(filepath());
}
QFile f(!fileName.isEmpty() ? fileName : filename());
if (!f.open(QFile::ReadOnly))
{
qDebug() << Q_FUNC_INFO << ":"
<< "cannot open file" << f.fileName() << ":\n"
<< f.errorString();
return QSharedPointer<T>();
}
auto data = f.readAll();
QJsonValue json = QJsonDocument::fromJson(data).object();
return QSharedPointer<T>(
new T(json[T::staticMetaObject.className()]),
&T::deleteLater
);
}
static bool write(
const QSharedPointer<T>& value,
const QString fileName = QString()
)
{
static QMutex mtx;
QMutexLocker l(&mtx);
QFile f(!fileName.isEmpty() ? fileName : filename());
if (!QDir(filepath()).exists())
{
QDir().mkpath(filepath());
}
// bool fileExists = f.exists();
if (!f.open(QFile::WriteOnly))
{
qDebug() << Q_FUNC_INFO << ":"
<< "cannot open file" << f.fileName() << ":\n"
<< f.errorString();
return false;
}
const auto json =
QJsonObject{{T::staticMetaObject.className(), *value}};
f.write(QJsonDocument(json).toJson());
f.flush();
m_instance = read();
return true;
}
static bool remove(const QString fileName = QString())
{
static QMutex mtx;
QMutexLocker l(&mtx);
QFile f(!fileName.isEmpty() ? fileName : filename());
if (!f.remove())
{
qDebug() << Q_FUNC_INFO << ":"
<< "cannot delete file" << f.fileName() << ":\n"
<< f.errorString();
return false;
}
return true;
}
static QString filepath()
{
return QStandardPaths::writableLocation(
QStandardPaths::AppConfigLocation
);
}
static QString filename()
{
return filepath() + QDir::separator() +
T::staticMetaObject.className() + "." + extension;
}
typedef QSharedPointer<T> FactorySharedPointer;
public:
static const QString extension;
private:
static FactorySharedPointer m_instance;
static QFileSystemWatcher m_watcher;
};
template <typename T>
QString const JsonObjectFile<T>::extension = QStringLiteral("json");
template <class T>
typename JsonObjectFile<T>::FactorySharedPointer JsonObjectFile<T>::m_instance;
template <class T> QFileSystemWatcher JsonObjectFile<T>::m_watcher;
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