#ifndef CREDENTIALS_H
#define CREDENTIALS_H

#include "client.h"
#include <QXmppTask.h>
#include <QXmppPromise.h>
#include <QObject>
#include <QList>
#include <QPair>
#include <QStringList>
#include <variant>

class Credentials : public QObject
{
    Q_OBJECT
public:
    struct Success {};
    struct Error
    {
        QString description;
    };

    using Pair = QPair<QString, QString>;
    using PairList = QList<Pair>;
    using StoreResult = std::variant<Success, Error>;
    using LoadResult = std::variant<QString, Error>;
    using PairListResult = std::variant<PairList, Error>;

    QXmppTask<PairListResult> load();
    QXmppTask<StoreResult> store(Client *c);

private:
    using Users = std::variant<QStringList, Error>;

    QXmppTask<StoreResult> store(const QString &key, const QString &value);
    QXmppTask<StoreResult> store(const QString &user);
    QXmppTask<LoadResult> load(const QString &key);
    QXmppTask<LoadResult> storedUsersList();
    QXmppTask<Users> storedUsers();
    QXmppTask<PairListResult> load(PairList &pairs,
        QStringList::const_iterator &it,
        QStringList::const_iterator end);
};

#endif