#ifndef FESA_ELEMENTS_ELEMENT_DOF_LAYOUT_H_
#define FESA_ELEMENTS_ELEMENT_DOF_LAYOUT_H_

#include <cstdint>
#include <functional>
#include <vector>

#include "fesa/core/source_identity.h"

namespace fesa {

/// @brief Identifies one component in the stable six-DOF node layout.
enum class DofComponent : std::uint8_t {
  kUx,
  kUy,
  kUz,
  kUrx,
  kUry,
  kUrz,
};

/// @brief Describes one runtime element's stable node and component order.
struct ElementDofLayout {
  SourceEntityId source_id;
  std::vector<EntityIndex> node_indices;
  std::vector<DofComponent> components_per_node;
};

class Element;

/// @brief Provides non-owning runtime elements in stable owner order.
/// @note Every referenced element must outlive this view.
using ElementView = std::vector<std::reference_wrapper<const Element>>;


}  // namespace fesa

#endif  // FESA_ELEMENTS_ELEMENT_DOF_LAYOUT_H_