/*  This file is part of the KDE libraries
    Copyright (C) 2022 Ivailo Monev <xakepa10@gmail.com>

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License version 2, as published by the Free Software Foundation.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public License
    along with this library; see the file COPYING.LIB.  If not, write to
    the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
    Boston, MA 02110-1301, USA.
*/

#ifndef KPASSWDSTORE_H
#define KPASSWDSTORE_H

#include "kpasswdstore_export.h"

#include <QObject>

class KPasswdStorePrivate;

/*!
    Class to store and retrieve passwords.

    The password used for encrypting and decrypting the store will be asked for
    upon the first request and again after 2 minutes of inactivity. Opening the
    store pre-emptively is also possbile but optional.

    @code
    KPasswdStore kpasswdstore;
    kpasswdstore.setStoreID("myid");
    if (kpasswdstore.openStore()) {
        qDebug() << kpasswdstore.storePasswd("mykey", "mypass");
        qDebug() << kpasswdstore.getPasswd("mykey");
    } else {
        qWarning() << "could not open store";
    }
    @endcode

    Unlike KWallet the password stores do not use master password (for the
    commonly used network and local wallets) - each store has its own password
    and if password for one store is compromised the other stores will not be
    affected, unless the same password is used for multiple stores. Note that
    this is left up to the user - using the same password for multiple password
    stores is absolutely possible.

    @since 4.21
    @note there are some type of changes and additions I will intentionally not
    make nor will I accept patches for
*/
class KPASSWDSTORE_EXPORT KPasswdStore : public QObject
{
    Q_OBJECT
public:
    /*!
        @brief Contructs object with @p parent
    */
    KPasswdStore(QObject *parent = nullptr);
    ~KPasswdStore();

    /*!
        @brief Sets the store ID to @p id
        @note The ID is @p QApplication::applicationName() by default
    */
    void setStoreID(const QString &id);

    /*!
        @brief Opens the store by asking for the password for it and returns
        @p true if the store is open, @p false otherwise
    */
    bool openStore(const qlonglong windowid = 0);

    /*!
        @brief If @p cacheonly is @p true then no permanent storage is used and
        passwords store is discarded when the object is destroyed. Whenever
        called the cache is also cleared
        @note Caching only is disabled by default
    */
    void setCacheOnly(const bool cacheonly);
    /*!
        @brief Returns @p true if passwords are cached only, @p false otherwise
    */
    bool cacheOnly() const;

    /*!
        @brief Returns @p true if there is password for the given @p key in the
        password store, @p false otherwise
    */
    bool hasPasswd(const QByteArray &key, const qlonglong windowid = 0);
    /*!
        @brief Retrieves password for the given @p key from the password store
    */
    QString getPasswd(const QByteArray &key, const qlonglong windowid = 0);
    /*!
        @brief Stores @p passwd with the given @p key in the password store
    */
    bool storePasswd(const QByteArray &key, const QString &passwd, const qlonglong windowid = 0);

    /*!
        @brief Returns unique key for @p string for use with @p getPasswd() and @p storePasswd()
    */
    static QByteArray makeKey(const QString &string);

    /*!
        @brief Returns all current password stores
    */
    static QStringList stores();

private:
    Q_DISABLE_COPY(KPasswdStore);
    KPasswdStorePrivate *const d;
};

#endif // KPASSWDSTORE_H