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 * OpenSpace                                                                             *
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 * Copyright (c) 2014-2021                                                               *
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#include <modules/space/rendering/simplespheregeometry.h>

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

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

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

    struct [[codegen::Dictionary(SimpleSphereGeometry)]] Parameters {
        // [[codegen::verbatim(RadiusInfo.description)]]
        std::variant<float, glm::vec3> radius;

        // [[codegen::verbatim(SegmentsInfo.description)]]
        int segments;
    };
#include "simplespheregeometry_codegen.cpp"
} // namespace

namespace openspace::planetgeometry {

documentation::Documentation SimpleSphereGeometry::Documentation() {
    documentation::Documentation doc = codegen::doc<Parameters>();
    doc.id = "space_geometry_simplesphere";
    return doc;
}

SimpleSphereGeometry::SimpleSphereGeometry(const ghoul::Dictionary& dictionary)
    : _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)
{
    const Parameters p = codegen::bake<Parameters>(dictionary);

    if (std::holds_alternative<float>(p.radius)) {
        const float radius = std::get<float>(p.radius);
        _radius = glm::dvec3(radius, radius, radius);
    }
    else {
        _radius = std::get<glm::vec3>(p.radius);
    }

    _segments = p.segments;

    // 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() {} // NOLINT

void SimpleSphereGeometry::initialize() {
    createSphere();
}

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

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

float SimpleSphereGeometry::boundingSphere() const {
    const glm::vec3 radius = _radius;
    return std::max(std::max(radius[0], radius[1]), radius[2]);
}

void SimpleSphereGeometry::createSphere() {
    const glm::vec3 radius = _radius.value();

    delete _sphere;
    _sphere = new Sphere(radius, _segments);
    _sphere->initialize();
}

}  // namespace openspace::planetgeometry