#pragma once

#include <base/primitive.hpp>
#include <subface/simple/plane.hpp>
#include <subface/simple/cylinder_face.hpp>

namespace internal
{
struct cylinder_t final : primitive {
    void initialize(primitive_data_center_t &) override;
    void destroy() override;

    primitive_type get_type() const override { return PRIMITIVE_TYPE_CYLINDER; };

    marked_subface_ptr_t<internal::cylinder_face_t> cylinder_face{};
    marked_subface_ptr_t<internal::plane_t>         bottom_plane{};
    marked_subface_ptr_t<internal::plane_t>         top_plane{};

    // why virtual? For special primitives like cylinder, it may have multiple parts.
    // The part with index 0 may not be the identity transform. 
    // For example, the cylinder face has no z translation.
    // Note: The AABB of a cylinder is defined by the side surface, and z-axis scaling does not affect the side surface's radius.
    // The degeneracy (simplification) check for a cylinder only considers the first two rows of the transform matrix (x/y directions),
    // because scaling along z does not change the essential geometry of the cylinder side surface.
    // TODO: the better way is to redefine cylinder, make identity transform as the first part.
    const internal::transform_block &get_identity_local_to_world() const override;

protected:
    void initialize(primitive_data_center_t &, const std::vector<std::pair<internal::paired_model_matrix *, bool>> &) override;

    marked_subface_ptr_t<subface> *get_subface() const override { return (marked_subface_ptr_t<subface> *)(&cylinder_face); }

    size_t get_subface_count() const override { return 3; }
};
} // namespace internal