/*
    SPDX-FileCopyrightText: 2014 Akarsh Simha <akarsh.simha@kdemail.net>

    SPDX-License-Identifier: GPL-2.0-or-later
*/

#pragma once

#include "dms.h"

#include <QPixmap>

#include <memory>

class FOV;
class SkyPoint;

/**
 * @class EyepieceField
 * @short Renders the view through the eyepiece of various telescope types
 *
 * @author Akarsh Simha <akarsh.simha@kdemail.net>
 */
namespace EyepieceField
{
    /**
     * @short Generate the eyepiece field view and corresponding image view
     * @param sp Sky point to draw the render the eyepiece field around
     * @param skyChart A non-null pointer to replace with the eyepiece field image
     * @param skyImage An optionally non-null pointer to replace with the re-oriented sky image
     * @param fovWidth width of the field-of-view in arcminutes
     * @param fovHeight height of field-of-view in arcminutes (if not supplied, is set to fovWidth)
     * @param imagePath Optional path to DSS or other image. North
     * should be on the top of the image, and the size should be in
     * the metadata; otherwise 1.01 arcsec/pixel is assumed.
     * @note fovWidth can be zero/negative if imagePath is non-empty. If it is, the image
     * size is used for the FOV.
     * @note fovHeight can be zero/negative. If it is, fovWidth will be used. If fovWidth is also
     * zero, image size is used.
     */
    void generateEyepieceView(SkyPoint *sp, QImage *skyChart, QImage *skyImage = nullptr, double fovWidth = -1.0,
                                     double fovHeight = -1.0, const QString &imagePath = QString());

    /**
     * @short Overloaded method provided for convenience. Obtains fovWidth/fovHeight from
     * FOV if non-null, else uses image
     */
    void generateEyepieceView(SkyPoint *sp, QImage *skyChart, QImage *skyImage = nullptr,
                                     const FOV *fov = nullptr, const QString &imagePath = QString());

    /**
     * @short Orients the eyepiece view as needed, performs overlaying etc.
     * @param skyChart image which contains the sky chart, possibly generated using generateEyepieceView
     * @param skyImage optional image which contains the sky image, possibly generated using generateEyepieceView
     * @param renderChart pixmap onto which the sky chart is to be rendered
     * @param renderImage optional pixmap onto which the sky image is to be rendered
     * @param rotation optional, number of degrees by which to rotate the image(s)
     * @param scale optional, factor by which to scale the image(s)
     * @param flip optional, if true, the image is mirrored horizontally
     * @param invert optional, if true, the image is inverted, i.e. rotated by 180 degrees
     * @param overlay optional, if true, the sky image is overlaid on the sky map
     * @param invertColors optional, if true, the sky image is color-inverted
     */
    void renderEyepieceView(const QImage *skyChart, QPixmap *renderChart, const double rotation = 0,
                                   const double scale = 1.0, const bool flip = false, const bool invert = false,
                                   const QImage *skyImage = nullptr, QPixmap *renderImage = nullptr,
                                   const bool overlay = false, const bool invertColors = false);

    /**
     * @short Convenience method that generates and the renders the eyepiece view
     * @note calls generateEyepieceView() followed by the raw form of renderEyepieceView() to render an eyepiece view
     */
    void renderEyepieceView(SkyPoint *sp, QPixmap *renderChart, double fovWidth = -1.0, double fovHeight = -1.0,
                                   const double rotation = 0, const double scale = 1.0, const bool flip = false,
                                   const bool invert = false, const QString &imagePath = QString(),
                                   QPixmap *renderImage = nullptr, const bool overlay = false,
                                   const bool invertColors = false);

    /**
     * @short Finds the angle between "up" (i.e. direction of increasing altitude) and "north" (i.e. direction of increasing declination) at a given point in the sky
     * @attention Procedure does not account for precession and nutation at the moment
     * @note SkyPoint must already have Equatorial and Horizontal coordinate synced
     */
    dms findNorthAngle(const SkyPoint *sp, const dms *lat);
};
