/***************************************************************************
 *   Copyright (c) 2011 Jürgen Riegel (juergen.riegel@web.de)              *
 *                                                                         *
 *   This file is part of the FreeCAD CAx development system.              *
 *                                                                         *
 *   This library is free software; you can redistribute it and/or         *
 *   modify it under the terms of the GNU Library General Public           *
 *   License as published by the Free Software Foundation; either          *
 *   version 2 of the License, or (at your option) any later version.      *
 *                                                                         *
 *   This library  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 Library General Public License for more details.                  *
 *                                                                         *
 *   You should have received a copy of the GNU Library General Public     *
 *   License along with this library; see the file COPYING.LIB. If not,    *
 *   write to the Free Software Foundation, Inc., 59 Temple Place,         *
 *   Suite 330, Boston, MA  02111-1307, USA                                *
 *                                                                         *
 ***************************************************************************/


#include <sstream>
#include <QAction>
#include <QFileInfo>
#include <QImage>
#include <QMenu>
#include <QString>
#include <QSvgRenderer>
#include <Inventor/nodes/SoCoordinate3.h>
#include <Inventor/nodes/SoFaceSet.h>
#include <Inventor/nodes/SoLightModel.h>
#include <Inventor/nodes/SoMaterial.h>
#include <Inventor/nodes/SoSeparator.h>
#include <Inventor/nodes/SoShapeHints.h>
#include <Inventor/nodes/SoTexture2.h>
#include <Inventor/nodes/SoTextureCoordinate2.h>


#include <App/Document.h>
#include <Gui/ActionFunction.h>
#include <Gui/BitmapFactory.h>
#include <Gui/Control.h>
#include <Gui/TaskView/TaskImage.h>
#include <App/ImagePlane.h>

#include "ViewProviderImagePlane.h"


using namespace Gui;


PROPERTY_SOURCE(Gui::ViewProviderImagePlane, Gui::ViewProviderGeometryObject)
const char* ViewProviderImagePlane::LightingEnums[] = {"One side", "Two side", nullptr};

ViewProviderImagePlane::ViewProviderImagePlane()
{
    ADD_PROPERTY_TYPE(Lighting, (1L), "Object Style", App::Prop_None, "Set object lighting.");
    Lighting.setEnums(LightingEnums);

    texture = new SoTexture2;
    texture->ref();

    pcCoords = new SoCoordinate3();
    pcCoords->ref();

    shapeHints = new SoShapeHints;
    shapeHints->shapeType = SoShapeHints::UNKNOWN_SHAPE_TYPE;
    shapeHints->vertexOrdering = SoShapeHints::COUNTERCLOCKWISE;
    shapeHints->ref();

    sPixmap = "image-plane";

    ShapeAppearance.setDiffuseColor(1.0F, 1.0F, 1.0F);
}

ViewProviderImagePlane::~ViewProviderImagePlane()
{
    pcCoords->unref();
    texture->unref();
    shapeHints->unref();
}

void ViewProviderImagePlane::attach(App::DocumentObject* pcObj)
{
    ViewProviderGeometryObject::attach(pcObj);

    // NOTE: SoFCSelection node has beem removed because it led to
    // problems using the image as a construction plane with the
    // draft commands
    SoSeparator* shading = new SoSeparator;
    shading->addChild(pcCoords);

    SoTextureCoordinate2* textCoord = new SoTextureCoordinate2;
    textCoord->point.set1Value(0, 0, 0);
    textCoord->point.set1Value(1, 1, 0);
    textCoord->point.set1Value(2, 1, 1);
    textCoord->point.set1Value(3, 0, 1);
    shading->addChild(textCoord);

    // texture
    texture->model = SoTexture2::MODULATE;
    shading->addChild(texture);

    shading->addChild(shapeHints);
    shading->addChild(pcShapeMaterial);

    // plane
    pcCoords->point.set1Value(0, 0, 0, 0);
    pcCoords->point.set1Value(1, 1, 0, 0);
    pcCoords->point.set1Value(2, 1, 1, 0);
    pcCoords->point.set1Value(3, 0, 1, 0);
    SoFaceSet* faceset = new SoFaceSet;
    faceset->numVertices.set1Value(0, 4);
    shading->addChild(faceset);

    addDisplayMaskMode(shading, "Shading");

    SoLightModel* lightmodel = new SoLightModel;
    lightmodel->model = SoLightModel::BASE_COLOR;

    SoSeparator* noshading = new SoSeparator;
    noshading->addChild(pcCoords);
    noshading->addChild(textCoord);
    noshading->addChild(texture);
    noshading->addChild(shapeHints);
    noshading->addChild(pcShapeMaterial);
    noshading->addChild(lightmodel);
    noshading->addChild(faceset);

    addDisplayMaskMode(noshading, "No shading");
}

void ViewProviderImagePlane::setDisplayMode(const char* ModeName)
{
    if (strcmp("Shading", ModeName) == 0) {
        setDisplayMaskMode("Shading");
    }
    else if (strcmp("No shading", ModeName) == 0) {
        setDisplayMaskMode("No shading");
    }
    ViewProviderGeometryObject::setDisplayMode(ModeName);
}

std::vector<std::string> ViewProviderImagePlane::getDisplayModes() const
{
    std::vector<std::string> StrList;
    StrList.emplace_back("Shading");
    StrList.emplace_back("No shading");
    return StrList;
}

void ViewProviderImagePlane::onChanged(const App::Property* prop)
{
    if (prop == &Lighting) {
        if (Lighting.getValue() == 0) {
            shapeHints->vertexOrdering = SoShapeHints::UNKNOWN_ORDERING;
        }
        else {
            shapeHints->vertexOrdering = SoShapeHints::COUNTERCLOCKWISE;
        }
    }
    ViewProviderGeometryObject::onChanged(prop);
}

void ViewProviderImagePlane::setupContextMenu(QMenu* menu, QObject* receiver, const char* member)
{
    Gui::ActionFunction* func = new Gui::ActionFunction(menu);
    QAction* action = menu->addAction(QObject::tr("Change Image"));
    action->setIcon(QIcon(QLatin1String("images:image-scaling.svg")));
    func->trigger(action, [this]() { this->manipulateImage(); });

    ViewProviderGeometryObject::setupContextMenu(menu, receiver, member);
}

bool ViewProviderImagePlane::doubleClicked()
{
    manipulateImage();
    return true;
}

void ViewProviderImagePlane::manipulateImage()
{
    auto dialog = new TaskImageDialog(getObject<Image::ImagePlane>());

    Gui::Control().showDialog(dialog);
}

void ViewProviderImagePlane::resizePlane(float xsize, float ysize)
{
    pcCoords->point.set1Value(0, -(xsize / 2), -(ysize / 2), 0.0);
    pcCoords->point.set1Value(1, +(xsize / 2), -(ysize / 2), 0.0);
    pcCoords->point.set1Value(2, +(xsize / 2), +(ysize / 2), 0.0);
    pcCoords->point.set1Value(3, -(xsize / 2), +(ysize / 2), 0.0);
}

void ViewProviderImagePlane::loadImage()
{
    Image::ImagePlane* imagePlane = static_cast<Image::ImagePlane*>(pcObject);
    std::string fileName = imagePlane->ImageFile.getValue();

    if (!fileName.empty()) {
        QImage impQ;
        if (isSvgFile(fileName.c_str())) {
            impQ = loadSvg(fileName.c_str());
        }
        else {
            impQ = loadRaster(fileName.c_str());
        }

        QSizeF size = getSizeInMM(impQ);
        setPlaneSize(size, impQ);
        convertToSFImage(impQ);
    }
}

void ViewProviderImagePlane::setPlaneSize(const QSizeF& size, const QImage& img)
{
    if (!img.isNull()) {
        Image::ImagePlane* imagePlane = static_cast<Image::ImagePlane*>(pcObject);
        // When restoring the document or importing a ImagePlane by eg. pasting it
        // preserve the X and Y size.
        if (!isRestoring() && !pcObject->testStatus(App::ObjectStatus::ObjImporting)) {
            imagePlane->XSize.setValue(size.width());
            imagePlane->YSize.setValue(size.height());
        }

        imagePlane->XPixelsPerMeter = img.dotsPerMeterX();
        imagePlane->YPixelsPerMeter = img.dotsPerMeterY();
    }
}

QImage ViewProviderImagePlane::loadRaster(const char* fileName) const
{
    QImage img;
    img.load(QString::fromUtf8(fileName));
    return img;
}

void ViewProviderImagePlane::reloadIfSvg()
{
    Image::ImagePlane* imagePlane = static_cast<Image::ImagePlane*>(pcObject);
    std::string fileName = imagePlane->ImageFile.getValue();

    if (isSvgFile(fileName.c_str())) {
        double xsize = imagePlane->XSize.getValue();
        double ysize = imagePlane->YSize.getValue();

        QImage impQ = loadSvgOfSize(fileName.c_str(), QSizeF(xsize, ysize));
        convertToSFImage(impQ);
    }
}

QImage ViewProviderImagePlane::loadSvg(const char* filename) const
{
    QSizeF defaultSize = defaultSizeOfSvg(filename);
    QPixmap px = BitmapFactory().pixmapFromSvg(filename, defaultSize);
    return px.toImage();
}

QImage ViewProviderImagePlane::loadSvgOfSize(const char* filename, const QSizeF& size) const
{
    QSizeF psize = pixelSize(filename, size);
    QPixmap px = BitmapFactory().pixmapFromSvg(filename, psize);
    return px.toImage();
}

bool ViewProviderImagePlane::isSvgFile(const char* filename) const
{
    QFileInfo fi(QString::fromUtf8(filename));
    return (fi.suffix().toLower() == QLatin1String("svg"));
}

QSizeF ViewProviderImagePlane::defaultSizeOfSvg(const char* filename) const
{
    QSvgRenderer svg;
    svg.load(QString::fromUtf8(filename));
    return svg.defaultSize();
}

QSizeF ViewProviderImagePlane::getSizeInMM(const QImage& img) const
{
    double xPixelsPerM = img.dotsPerMeterX();
    double width = img.width();
    width = width * 1000 / xPixelsPerM;

    double yPixelsPerM = img.dotsPerMeterY();
    double height = img.height();
    height = height * 1000 / yPixelsPerM;

    QSizeF sizef;
    sizef.setWidth(width);
    sizef.setHeight(height);
    return sizef;
}

QSizeF ViewProviderImagePlane::pixelSize(const char* filename, const QSizeF& size) const
{
    QImage tmp;
    if (tmp.load(QString::fromUtf8(filename))) {
        double xPixelsPerM = tmp.dotsPerMeterX();
        double yPixelsPerM = tmp.dotsPerMeterY();

        double width = size.width();
        double height = size.height();

        width = width * xPixelsPerM / 1000;
        height = height * yPixelsPerM / 1000;

        return {width, height};
    }

    return size;
}

void ViewProviderImagePlane::convertToSFImage(const QImage& img)
{
    if (!img.isNull()) {
        SoSFImage sfimg;
        // convert to Coin bitmap
        BitmapFactory().convert(img, sfimg);
        texture->image = sfimg;
    }
}

void ViewProviderImagePlane::updateData(const App::Property* prop)
{
    Image::ImagePlane* pcPlaneObj = static_cast<Image::ImagePlane*>(pcObject);
    if (prop == &pcPlaneObj->XSize || prop == &pcPlaneObj->YSize) {
        float xsize = pcPlaneObj->XSize.getValue();
        float ysize = pcPlaneObj->YSize.getValue();

        resizePlane(xsize, ysize);
        reloadIfSvg();
    }
    else if (prop == &pcPlaneObj->ImageFile) {
        loadImage();
    }
    else {
        Gui::ViewProviderGeometryObject::updateData(prop);
    }
}