#ifndef FESA_ELEMENTS_HEX8_DEFINITION_H_
#define FESA_ELEMENTS_HEX8_DEFINITION_H_

#include <array>
#include <utility>
#include <vector>

#include "fesa/elements/element_definition.h"

namespace fesa {
/// @brief Owns source-safe eight-node Solid topology without numerical state.
class Hex8Definition final : public ElementDefinition {
 public:
  /// @brief Constructs a semantic candidate in source connectivity order.
  Hex8Definition(SourceEntityId source, std::array<EntityIndex, 8> nodes,
                 EntityIndex material, EntityIndex section,
                 SourceLocation source_location)
      : source_id{std::move(source)},
        node_indices{nodes},
        material_index{material},
        section_index{section},
        location{std::move(source_location)},
        property_index_{section},
        node_indices_view_{nodes.begin(), nodes.end()} {}
  ElementDefinitionKind Kind() const noexcept override {
    return ElementDefinitionKind::kHex8;
  }
  const SourceEntityId& SourceId() const noexcept override { return source_id; }
  std::string_view SourceElementType() const noexcept override {
    return "C3D8";
  }
  const std::vector<EntityIndex>& NodeIndices() const noexcept override {
    return node_indices_view_;
  }
  EntityIndex MaterialIndex() const noexcept override { return material_index; }
  EntityIndex PropertyIndex() const noexcept override {
    return property_index_;
  }

  SourceEntityId source_id;
  std::array<EntityIndex, 8> node_indices;
  EntityIndex material_index;
  EntityIndex section_index;
  SourceLocation location;

 private:
  friend class Domain;
  /// @brief Synchronizes candidate topology with the immutable base view.
  void SynchronizeNodeIndices() {
    node_indices_view_.assign(node_indices.begin(), node_indices.end());
  }
  /// @brief Binds the local Solid section to the unified property collection.
  void SetPropertyIndex(EntityIndex index) noexcept { property_index_ = index; }
  EntityIndex property_index_;
  std::vector<EntityIndex> node_indices_view_;
};
}  // namespace fesa
#endif  // FESA_ELEMENTS_HEX8_DEFINITION_H_