#pragma once
#include "compat/defs.hpp"
#include "scenery.hpp"
#include "anim.hpp"
#include <array>
#include <Corrade/Containers/BitArray.h>
#include <Corrade/Containers/BitArrayView.h>
#include <Corrade/Containers/String.h>
#include <Magnum/Math/Vector2.h>
#include <Magnum/ImageView.h>
#include <Magnum/GL/Texture.h>

namespace floormat {

struct anim_atlas final
{
    using texcoords = std::array<Vector2, 4>;
    using quad = std::array<Vector3, 4>;

    anim_atlas() noexcept;
    anim_atlas(StringView name, const ImageView2D& tex, anim_def info) noexcept;
    ~anim_atlas() noexcept;

    anim_atlas(anim_atlas&&) noexcept;
    anim_atlas& operator=(anim_atlas&&) noexcept;

    StringView name() const noexcept;
    GL::Texture2D& texture() noexcept;
    const anim_def& info() const noexcept;

    const anim_group& group(rotation r) const noexcept;
    const anim_frame& frame(rotation r, std::size_t frame) const noexcept;
    texcoords texcoords_for_frame(rotation r, std::size_t frame) const noexcept;
    quad frame_quad(const Vector3& center, rotation r, std::size_t frame) const noexcept;

    BitArrayView bitmask() const;

    fm_DECLARE_DELETED_COPY_ASSIGNMENT(anim_atlas);

private:
    GL::Texture2D _tex;
    String _name;
    BitArray _bitmask;
    anim_def _info;
    std::array<std::uint8_t, (std::size_t)rotation_COUNT> _group_indices = {
        0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
    };

    static decltype(_group_indices) make_group_indices(const anim_def& anim) noexcept;
    static std::uint8_t rotation_to_index(const anim_def& a, rotation r) noexcept;
    static BitArray make_bit_array(const ImageView2D& tex);
};

} // namespace floormat