#ifndef FESA_ELEMENTS_ELEMENT_DEFINITION_H_
#define FESA_ELEMENTS_ELEMENT_DEFINITION_H_

#include <string_view>
#include <vector>

#include "fesa/core/source_identity.h"

namespace fesa {

/// @brief Identifies the supported semantic element-definition kinds.
enum class ElementDefinitionKind { kEulerBeam3D, kMitc4Shell };

/// @brief Provides immutable source identity and topology for one element.
/// @note Numerical stiffness, recovery, and equation ids are intentionally
/// excluded from this semantic interface.
class ElementDefinition {
 public:
  virtual ~ElementDefinition() = default;

  /// @brief Returns the concrete semantic definition kind.
  virtual ElementDefinitionKind Kind() const noexcept = 0;

  /// @brief Returns the stable external source identity.
  virtual const SourceEntityId& SourceId() const noexcept = 0;

  /// @brief Returns the preserved source element type such as B33 or S4R.
  virtual std::string_view SourceElementType() const noexcept = 0;

  /// @brief Returns stable Domain node collection positions.
  virtual const std::vector<EntityIndex>& NodeIndices() const noexcept = 0;

  /// @brief Returns the stable Domain material collection position.
  virtual EntityIndex MaterialIndex() const noexcept = 0;

  /// @brief Returns the stable Domain property collection position.
  virtual EntityIndex PropertyIndex() const noexcept = 0;
};

}  // namespace fesa

#endif  // FESA_ELEMENTS_ELEMENT_DEFINITION_H_