/*
  This file is part of KDDockWidgets.

  Copyright (C) 2019 Klarälvdalens Datakonsult AB, a KDAB Group company, info@kdab.com
  Author: Sérgio Martins <sergio.martins@kdab.com>

  This program 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 2 of the License, or
  (at your option) any later version.

  This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
*/

// We don't care about performance related checks in the tests
// clazy:excludeall=ctor-missing-parent-argument,missing-qobject-macro,range-loop,missing-typeinfo,detaching-member,function-args-by-ref,non-pod-global-static,reserve-candidates,qstring-allocations

#ifndef KDDOCKWIDGETS_FUZZER_H
#define KDDOCKWIDGETS_FUZZER_H

#include "../Testing.h"
#include "MainWindowBase.h"
#include "Operations.h"

#include <QJsonDocument>
#include <QVector>
#include <random>

namespace KDDockWidgets {
namespace Testing {

static QVariantMap sizeToVariantMap(QSize sz)
{
    QVariantMap map;
    map["width"] = sz.width();
    map["height"] = sz.height();
    return map;
}

static QVariantMap rectToVariantMap(QRect r)
{
    QVariantMap map;
    map["size"] = sizeToVariantMap(r.size());
    map["x"] = r.x();
    map["y"] = r.y();
    return map;
}

class Fuzzer : public QObject
             , WarningObserver
{
    Q_OBJECT
public:

    struct FuzzerConfig
    {
        int numTests;
        int numOperationsPerTest;
        bool singleMainWindow;
    };

    struct DockWidgetDescriptor {
        typedef QVector<DockWidgetDescriptor> List;
        QSize minSize; // the minSize of the hosted widget
        QRect geometry;
        bool isFloating;
        bool isVisible;

        QVariantMap toVariantMap() const
        {
            QVariantMap map;
            map[QStringLiteral("minSize")] = sizeToVariantMap(minSize);
            map[QStringLiteral("geometry")] = rectToVariantMap(geometry);
            map[QStringLiteral("isFloating")] = isFloating;
            map[QStringLiteral("isVisible")] = isVisible;

            return map;
        }
    };

    struct MainWindowDescriptor {
        typedef QVector<MainWindowDescriptor> List;
        QRect geometry;
        MainWindowOption mainWindowOption;

        QVariantMap toVariantMap() const
        {
            QVariantMap map;
            map[QStringLiteral("geometry")] = rectToVariantMap(geometry);
            map[QStringLiteral("mainWindowOption")] = mainWindowOption;
            return map;
        }
    };

    struct Layout {
        typedef QVector<Layout> List;
        MainWindowDescriptor::List mainWindows;
        DockWidgetDescriptor::List dockWidgets;

        QVariantMap toVariantMap() const
        {
            QVariantList mainWindowsVariant;
            mainWindowsVariant.reserve(mainWindows.size());
            for (const auto &mw : mainWindows) {
                mainWindowsVariant << mw.toVariantMap();
            }

            QVariantList dockWidgetsVariant;
            dockWidgetsVariant.reserve(dockWidgets.size());
            for (const auto &dw : dockWidgets) {
                dockWidgetsVariant << dw.toVariantMap();
            }

            QVariantMap map;
            map[QStringLiteral("mainWindows")] = mainWindowsVariant;
            map[QStringLiteral("dockWidgets")] = dockWidgetsVariant;
            return map;
        }

    };

    struct Test {
        typedef QVector<Test> List;
        Layout initialLayout;
        Operations::OperationBase::List operations;
        QVariantMap toVariantMap() const
        {
            QVariantMap map;
            map[QStringLiteral("initialLayout")] = initialLayout.toVariantMap();
            return map;
        }
    };

    struct AddDockWidgetParams {
        MainWindowBase *mainWindow;
        DockWidgetBase *dockWidget;
        DockWidgetBase *relativeTo;
        KDDockWidgets::Location location;
        KDDockWidgets::AddingOption addingOption;
    };


    void runTest(const Test &);

    explicit Fuzzer(FuzzerConfig config, QObject *parent = nullptr);

    Fuzzer::Layout generateRandomLayout();

    Fuzzer::DockWidgetDescriptor generateRandomDockWidget();

    Fuzzer::DockWidgetDescriptor::List generateRandomDockWidgets(int num);

    bool getRandomBool(int truePercentage = 50);

    AddDockWidgetParams getRandomAddDockWidgetParams();

    KDDockWidgets::MainWindowBase* getRandomMainWindow();
    KDDockWidgets::DockWidgetBase* getRandomDockWidget(DockWidgetBase *excluding = nullptr);
    KDDockWidgets::DockWidgetBase* getRandomRelativeTo(MainWindowBase *mainWindow,
                                                       DockWidgetBase *excluding);

    KDDockWidgets::Location getRandomLocation();

    QPoint getRandomPos();

    Operations::OperationBase::Ptr getRandomOperation();

    Fuzzer::Test generateRandomTest();
    Fuzzer::Test::List generateRandomTests(int num);

    void fuzz();

    QRect randomGeometry();

    void onFatal() override;

private:
    std::random_device m_randomDevice;
    std::mt19937 m_randomEngine;
    FuzzerConfig m_fuzzerConfig;
    Fuzzer::Test m_currentTest;
};

}
}

#endif