/* === This file is part of Calamares - <https://github.com/calamares> ===
 *
 *   Copyright 2014-2017, Teo Mrnjavac <teo@kde.org>
 *   Copyright 2017, Adriaan de Groot <groot@kde.org>
 *
 *   Calamares is free software: you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation, either version 3 of the License, or
 *   (at your option) any later version.
 *
 *   Calamares 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 General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with Calamares. If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef REQUIREMENTSCHECKER_H
#define REQUIREMENTSCHECKER_H

#include <QObject>
#include <QStringList>

#include <functional>

class CheckerWidget;
class QWidget;

/**
 * An indication of a requirement, which is checked in preparation
 * for system installation. An entry has a name and some explanation,
 * as well as three meaningful states:
 *  - checked = true, the requirement is met (green)
 *  - checked = false, the requirement is not met
 *      - required = false, warn about it (yellow), no failure
 *      - required = true, prohibit installation (red)
 */
struct PrepareEntry
{
    QString name;
    std::function< QString() > enumerationText; //Partial string, inserted in a
                                                //list of requirements to satisfy.
    std::function< QString() > negatedText;     //Complete sentence about this requirement
                                                //not having been met.
    bool checked;
    bool required;
};

class RequirementsChecker : public QObject
{
    Q_OBJECT
public:
    explicit RequirementsChecker( QObject* parent = nullptr );
    virtual ~RequirementsChecker();

    QWidget* widget() const;

    void setConfigurationMap( const QVariantMap& configurationMap );

    bool verdict() const;

signals:
    void verdictChanged( bool );

private:
    QStringList m_entriesToCheck;
    QStringList m_entriesToRequire;

    bool checkEnoughStorage( qint64 requiredSpace );
    bool checkEnoughRam( qint64 requiredRam );
    bool checkBatteryExists();
    bool checkHasPower();
    bool checkHasInternet();
    bool checkIsRoot();
    void detectFirmwareType();

    QWidget* m_widget;
    qreal m_requiredStorageGB;
    qreal m_requiredRamGB;
    QString m_checkHasInternetUrl;

    CheckerWidget* m_actualWidget;
    bool m_verdict;
};

#endif // REQUIREMENTSCHECKER_H