#ifndef COCKATRICE_SINGLE_INSTANCE_MANAGER_H
#define COCKATRICE_SINGLE_INSTANCE_MANAGER_H

#include <QObject>
#include <QString>
#include <QStringList>
#include <qtmetamacros.h>

class QLocalServer;

class SingleInstanceManager : public QObject
{
    Q_OBJECT
public:
    explicit SingleInstanceManager(QObject *parent = nullptr);

    // Returns true if this process became the primary instance, false if
    // another instance is already running (and received our files).
    bool tryRun(const QStringList &initialFiles);

signals:
    void filesReceived(const QStringList &files);

private slots:
    void handleNewConnection();

private:
    enum class ForwardResult
    {
        Delivered,  // a live primary acknowledged the payload
        NoPrimary,  // no connectable primary socket exists
        PrimaryBusy // a primary exists but did not acknowledge in time
    };

    ForwardResult forwardToPrimary(const QStringList &filesToSend);

    QString serverName;
    QLocalServer *server = nullptr;
};

#endif // COCKATRICE_SINGLE_INSTANCE_MANAGER_H