/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
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** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
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****************************************************************************/

#pragma once

#include "utils_global.h"

#include <QSet>
#include <QString>
#include <QVariant>
#include <QWizardPage>

#include <functional>

namespace Utils {

class Wizard;
namespace Internal {

class QTCREATOR_UTILS_EXPORT ObjectToFieldWidgetConverter : public QWidget
{
    Q_OBJECT
    Q_PROPERTY(QVariant value READ value NOTIFY valueChanged)

public:
    template<class T, typename... Arguments>
    static ObjectToFieldWidgetConverter *create(T *sender,
                                                void (T::*member)(Arguments...),
                                                const std::function<QVariant()> &toVariantFunction)
    {
        auto widget = new ObjectToFieldWidgetConverter();
        widget->toVariantFunction = toVariantFunction;
        connect(sender, &QObject::destroyed, widget, &QObject::deleteLater);
        connect(sender, member, widget, [widget]() { emit widget->valueChanged(widget->value()); });
        return widget;
    }

signals:
    void valueChanged(const QVariant &);

private:
    ObjectToFieldWidgetConverter () = default;

    // is used by the property value
    QVariant value() { return toVariantFunction(); }
    std::function<QVariant()> toVariantFunction;
};

} // Internal

class QTCREATOR_UTILS_EXPORT WizardPage : public QWizardPage
{
    Q_OBJECT

public:
    explicit WizardPage(QWidget *parent = nullptr);

    virtual void pageWasAdded(); // called when this page was added to a Utils::Wizard

    template<class T, typename... Arguments>
    void registerObjectAsFieldWithName(const QString &name,
                                       T *sender,
                                       void (T::*changeSignal)(Arguments...),
                                       const std::function<QVariant()> &senderToVariant)
    {
        registerFieldWithName(name,
                              Internal::ObjectToFieldWidgetConverter::create(sender,
                                                                             changeSignal,
                                                                             senderToVariant),
                              "value",
                              SIGNAL(valueChanged(QValue)));
    }

    void registerFieldWithName(const QString &name, QWidget *widget,
                               const char *property = nullptr, const char *changedSignal = nullptr);

    virtual bool handleReject();
    virtual bool handleAccept();

signals:
    // Emitted when there is something that the developer using this page should be aware of.
    void reportError(const QString &errorMessage);

private:
    void registerFieldName(const QString &name);

    QSet<QString> m_toRegister;
};

} // namespace Utils