JSIBox2dPolygonShape.h

//
// Created by Hanno Gödecke on 15.07.22.
//

#pragma once

#include "box2d/b2_polygon_shape.h"

namespace Box2d {
    using namespace facebook;

    class JSIBox2dPolygonShape : public JsiWrappingSharedPtrHostObject<b2PolygonShape> {
    public:

        JSI_HOST_FUNCTION(SetAsBox) {
            getObject()->SetAsBox(
                    arguments[0].asNumber(),
                    arguments[1].asNumber()
            );
            return jsi::Value::undefined();
        }

        JSI_HOST_FUNCTION(Set) {
            auto array = arguments[0].asObject(runtime).asArray(runtime);
            auto n = static_cast<int32>(array.length(runtime));
            b2Vec2 points[n];
            for (int32 i = 0; i < n; ++i) {
              auto point = JSIBox2dVec2::fromValue(runtime, array.getValueAtIndex(runtime, i));
              points[i].x = point->x;
              points[i].y = point->y;
            }
            getObject()->Set(points, n);
            return jsi::Value::undefined();
        }

        JSI_EXPORT_FUNCTIONS(JSI_EXPORT_FUNC(JSIBox2dPolygonShape, SetAsBox),
                             JSI_EXPORT_FUNC(JSIBox2dPolygonShape, Set))

        /**
         * Constructor
         */
        JSIBox2dPolygonShape(const b2PolygonShape &shape)
                : JsiWrappingSharedPtrHostObject<b2PolygonShape>(
                std::make_shared<b2PolygonShape>(std::move(shape))) {}

        /**
        * Returns the underlying object from a host object of this type
        */
        static std::shared_ptr<b2PolygonShape> fromValue(jsi::Runtime &runtime,
                                                         const jsi::Value &obj) {
            return obj.asObject(runtime)
                    .asHostObject<JSIBox2dPolygonShape>(runtime)
                    ->getObject();
        }

        static const jsi::HostFunctionType
        createCtor() {
            return JSI_HOST_FUNCTION_LAMBDA {
                b2PolygonShape shape;

                return jsi::Object::createFromHostObject(
                        runtime,
                        std::make_shared<JSIBox2dPolygonShape>(
                                std::move(shape)
                        )
                );
            };
        };
    };
}