z-bar-qt/Plugins/ZShell/Settings/settingsfile.hpp

#pragma once

#include <qfilesystemwatcher.h>
#include <qjsonvalue.h>
#include <qobject.h>
#include <qtimer.h>

namespace ZShell::settings {

class SettingsFile : public QObject {
	Q_OBJECT

	public:
	enum class LoadResult : quint8 { Unchanged, Changed, ParseError, Error };

	explicit SettingsFile(QString path, QObject* parent = nullptr);

	[[nodiscard]] std::optional<QJsonValue> read() const;
	void write(const QJsonValue& json);

	LoadResult load(bool reportErrors = true);

	signals:
	void changed(); // Data changed, not file watcher event
	void readFailed(const QString& error);
	void writeFailed(const QString& error);

	private:
	QString m_path;
	QFileSystemWatcher* m_watcher;
	QTimer* m_saveDebounce;
	QTimer* m_loadDebounce;
	int m_loadRetries;
	std::optional<QJsonValue> m_lastData;
	std::optional<QJsonValue> m_pendingWrite;

	void onFileChanged();
	void onDirChanged();

	void initWatcher();
	void scheduleLoad();
	void onLoadDebounced();
	void save();
};

} // namespace ZShell::settings