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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2017                                                               *
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#include <modules/space/rendering/simplespheregeometry.h>

#include <openspace/documentation/verifier.h>
#include <openspace/scene/scenegraphnode.h>
#include <openspace/rendering/renderable.h>
#include <openspace/util/powerscaledsphere.h>

namespace {
    const char* _loggerCat = "SimpleSphereGeometry";

    static const openspace::properties::Property::PropertyInfo RadiusInfo = {
        "Radius",
        "Radius",
        "This value specifies the radius of this sphere in meters."
    };

    static const openspace::properties::Property::PropertyInfo SegmentsInfo = {
        "Segments",
        "Segments",
        "This value specifies the number of segments that this sphere is split into."
    };
} // namespace

namespace openspace::planetgeometry {

documentation::Documentation SimpleSphereGeometry::Documentation() {
    using namespace documentation;
    return {
        "SimpleSphereGeometry",
        "space_geometry_simplesphere",
        {
            {
                "Type",
                new StringEqualVerifier("SimpleSphereGeometry"),
                "",
                Optional::No
            },
            {
                RadiusInfo.identifier,
                new OrVerifier(
                    new DoubleVerifier,
                    new DoubleVector3Verifier
                ),
                RadiusInfo.description,
                Optional::No
            },
            {
                SegmentsInfo.identifier,
                new IntVerifier,
                SegmentsInfo.description,
                Optional::No
            }
        },
        Exhaustive::Yes
    };
}

SimpleSphereGeometry::SimpleSphereGeometry(const ghoul::Dictionary& dictionary)
    : PlanetGeometry()
    , _radius(RadiusInfo, glm::vec3(1.f), glm::vec3(0.f), glm::vec3(std::pow(10.f, 20.f)))
    , _segments(SegmentsInfo, 20, 1, 5000)
    , _sphere(nullptr)
{
    documentation::testSpecificationAndThrow(
        Documentation(),
        dictionary,
        "SimpleSphereGeometry"
    );

    glm::vec3 ellipsoidRadius;
    if (dictionary.hasKeyAndValue<double>(RadiusInfo.identifier)) {
        const float r = static_cast<float>(
            dictionary.value<double>(RadiusInfo.identifier)
            );
        _radius = { r, r, r };
    }
    else {
        _radius = dictionary.value<glm::vec3>(RadiusInfo.identifier);
    }

    _segments = dictionary.value<int>(SegmentsInfo.identifier);

    // The shader need the radii values but they are not changeable runtime
    // TODO: Possibly add a scaling property @AA
    // Changing the radius/scaling should affect the shader but not the geometry? @AA
    _radius.onChange([&]() { createSphere(); });
    addProperty(_radius);

    _segments.onChange([&]() { createSphere(); });
    addProperty(_segments);
}

SimpleSphereGeometry::~SimpleSphereGeometry() {}

bool SimpleSphereGeometry::initialize(Renderable* parent) {
    bool success = PlanetGeometry::initialize(parent);
    createSphere();
    return success;
}

void SimpleSphereGeometry::deinitialize() {
    delete _sphere;
    _sphere = nullptr;
}

void SimpleSphereGeometry::render() {
    _sphere->render();
}

void SimpleSphereGeometry::createSphere() {
    const glm::vec3 radius = _radius.value();
    _parent->setBoundingSphere(std::max(std::max(radius[0], radius[1]), radius[2]));

    delete _sphere;
    _sphere = new PowerScaledSphere(glm::vec4(radius, 0.0), _segments);
    _sphere->initialize();
}

}  // namespace openspace::planetgeometry