/* ============================================================
 *
 * This file is a part of digiKam project
 * https://www.digikam.org
 *
 * Date        : 2023-05-15
 * Description : geolocation engine based on Marble.
 *               (c) 2007-2022 Marble Team
 *               https://invent.kde.org/education/marble/-/raw/master/data/credits_authors.html
 *
 * SPDX-FileCopyrightText: 2023-2024 by Gilles Caulier <caulier dot gilles at gmail dot com>
 *
 * SPDX-License-Identifier: LGPL-2.1-or-later
 *
 * ============================================================ */

#pragma once

// Qt includes

#include <QMap>
#include <QHash>
#include <QPen>
#include <QIcon>
#include <QColorDialog>

// Local includes

#include "DialogConfigurationInterface.h"
#include "RenderPlugin.h"
#include "GeoDataCoordinates.h"
#include "GeoDataLatLonAltBox.h"

namespace Ui
{
class GraticuleConfigWidget;
}

namespace Marble
{

class GeoDataLatLonAltBox;

/**
 * @brief A plugin that creates a coordinate grid on top of the map.
 * Unlike in all other classes we are using degree by default in this class.
 * This choice was made due to the fact that all common coordinate grids focus fully
 * on the degree system.
 */

class GraticulePlugin : public RenderPlugin,
    public DialogConfigurationInterface
{
    Q_OBJECT
    Q_PLUGIN_METADATA(IID "org.kde.marble.GraticulePlugin")
    Q_INTERFACES(Marble::RenderPluginInterface)
    Q_INTERFACES(Marble::DialogConfigurationInterface)
    MARBLE_PLUGIN(GraticulePlugin)

public:

    GraticulePlugin();

    explicit GraticulePlugin(const MarbleModel* marbleModel);

    QStringList backendTypes() const override;

    QString renderPolicy() const override;

    QStringList renderPosition() const override;

    QString name() const override;

    QString guiString() const override;

    QString nameId() const override;

    QString version() const override;

    QString description() const override;

    QString copyrightYears() const override;

    QVector<PluginAuthor> pluginAuthors() const override;

    QIcon icon() const override;

    QDialog* configDialog() override;

    void initialize() override;

    bool isInitialized() const override;

    bool render(GeoPainter* painter, ViewportParams* viewport, const QString& renderPos, GeoSceneLayer* layer = nullptr) override;

    qreal zValue() const override;

    QHash<QString, QVariant> settings() const override;

    void setSettings(const QHash<QString, QVariant>& settings) override;

public Q_SLOTS:

    void readSettings();
    void writeSettings();

    void gridGetColor();
    void tropicsGetColor();
    void equatorGetColor();

private:

    /**
    * @brief Renders the coordinate grid within the defined view bounding box.
    * @param painter the painter used to draw the grid
    * @param viewport the viewport
    */
    void renderGrid(GeoPainter* painter, ViewportParams* viewport,
                    const QPen& equatorCirclePen,
                    const QPen& tropicsCirclePen,
                    const QPen& gridCirclePen);

    /**
    * @brief Renders a latitude line within the defined view bounding box.
    * @param painter the painter used to draw the latitude line
    * @param latitude the latitude of the coordinate line measured in degree .
    * @param viewLatLonAltBox the latitude longitude bounding box that is covered by the view.
    */
    static void renderLatitudeLine(GeoPainter* painter, qreal latitude,
                                   const GeoDataLatLonAltBox& viewLatLonAltBox = GeoDataLatLonAltBox(),
                                   const QString& lineLabel = QString(),
                                   LabelPositionFlags labelPositionFlags = LineCenter);

    /**
     * @brief Renders a longitude line within the defined view bounding box.
     * @param painter the painter used to draw the latitude line
     * @param longitude the longitude of the coordinate line measured in degree .
     * @param viewLatLonAltBox the latitude longitude bounding box that is covered by the view.
     * @param polarGap the area around the poles in which most longitude lines are not drawn
     *        for reasons of aesthetics and clarity of the map. The polarGap avoids narrow
     *        concurring lines around the poles which obstruct the view onto the surface.
     *        The radius of the polarGap area is measured in degrees.
     * @param lineLabel draws a label using the font and color properties set for the painter.
     */
    static void renderLongitudeLine(GeoPainter* painter, qreal longitude,
                                    const GeoDataLatLonAltBox& viewLatLonAltBox = GeoDataLatLonAltBox(),
                                    qreal northPolarGap = 0.0, qreal southPolarGap = 0.0,
                                    const QString& lineLabel = QString(),
                                    LabelPositionFlags labelPositionFlags = LineCenter);

    /**
     * @brief Renders the latitude lines that are visible within the defined view bounding box.
     * @param painter the painter used to draw the latitude lines
     * @param viewLatLonAltBox the latitude longitude bounding box that is covered by the view.
     * @param step the angular distance between the lines measured in degrees .
     */
    void renderLatitudeLines(GeoPainter* painter,
                             const GeoDataLatLonAltBox& viewLatLonAltBox,
                             qreal step, qreal skipStep,
                             LabelPositionFlags labelPositionFlags = LineCenter
                            );

    /**
     * @brief Renders the longitude lines that are visible within the defined view bounding box.
     * @param painter the painter used to draw the latitude lines
     * @param viewLatLonAltBox the latitude longitude bounding box that is covered by the view.
     * @param step the angular distance between the lines measured in degrees .
     * @param northPolarGap the area around the north pole in which most longitude lines are not drawn
     *        for reasons of aesthetics and clarity of the map. The polarGap avoids narrow
     *        concurring lines around the poles which obstruct the view onto the surface.
     *        The radius of the polarGap area is measured in degrees.
     * @param southPolarGap the area around the south pole in which most longitude lines are not drawn
     *        for reasons of aesthetics and clarity of the map. The polarGap avoids narrow
     *        concurring lines around the poles which obstruct the view onto the surface.
     *        The radius of the polarGap area is measured in degrees.
     */
    void renderLongitudeLines(GeoPainter* painter,
                              const GeoDataLatLonAltBox& viewLatLonAltBox,
                              qreal step, qreal skipStep,
                              qreal northPolarGap = 0.0, qreal southPolarGap = 0.0,
                              LabelPositionFlags labelPositionFlags = LineCenter
                             ) const;

    /**
     * @brief Renders UTM exceptions that are visible within the defined view bounding box.
     * @param painter the painter used to draw the latitude lines
     * @param viewLatLonAltBox the latitude longitude bounding box that is covered by the view.
     * @param step the angular distance between the lines measured in degrees .
     * @param northPolarGap the area around the north pole in which most longitude lines are not drawn
     *        for reasons of aesthetics and clarity of the map. The polarGap avoids narrow
     *        concurring lines around the poles which obstruct the view onto the surface.
     *        The radius of the polarGap area is measured in degrees.
     * @param southPolarGap the area around the south pole in which most longitude lines are not drawn
     *        for reasons of aesthetics and clarity of the map. The polarGap avoids narrow
     *        concurring lines around the poles which obstruct the view onto the surface.
     *        The radius of the polarGap area is measured in degrees.
     */
    static void renderUtmExceptions(GeoPainter* painter,
                                    const GeoDataLatLonAltBox& viewLatLonAltBox,
                                    qreal step,
                                    qreal northPolarGap, qreal southPolarGap,
                                    const QString& label,
                                    LabelPositionFlags labelPositionFlags);

    /**
     * @brief Maps the number of coordinate lines per 360 deg against the globe radius on the screen.
     * @param notation Determines whether the graticule is according to the DMS or Decimal system.
     */
    void initLineMaps(GeoDataCoordinates::Notation notation);

private:

    GeoDataCoordinates::Notation    m_currentNotation;

    // Maps the zoom factor to the amount of lines per 360 deg
    QMap<qreal, qreal>               m_boldLineMap;
    QMap<qreal, qreal>               m_normalLineMap;

    QPen                            m_equatorCirclePen;
    QPen                            m_tropicsCirclePen;
    QPen                            m_gridCirclePen;
    bool                            m_showPrimaryLabels;
    bool                            m_showSecondaryLabels;

    bool                            m_isInitialized;

    QIcon                           m_icon;

    Ui::GraticuleConfigWidget*      ui_configWidget  = nullptr;
    QDialog*                        m_configDialog   = nullptr;
};

} // namespace Marble
