#ifndef FESA_ELEMENTS_THERMAL_SHELL_H_
#define FESA_ELEMENTS_THERMAL_SHELL_H_

#include <array>
#include <cstddef>

#include "fesa/math/matrix.h"
#include "fesa/math/vector3.h"

namespace fesa {

/// @brief Local Q4 times two-segment P2 transient-heat shell kernel.
class ThermalShell final {
 public:
  ThermalShell(std::array<std::size_t, 4> node_indices,
               std::array<Vector3, 4> coordinates, double conductivity,
               double density, double specific_heat, double thickness);
  const std::array<std::size_t, 4>& NodeIndices() const noexcept;
  const Matrix& Conductivity() const noexcept;
  const Matrix& Capacity() const noexcept;
 private:
  std::array<std::size_t, 4> node_indices_;
  Matrix conductivity_{20U, 20U};
  Matrix capacity_{20U, 20U};
};

}  // namespace fesa
#endif  // FESA_ELEMENTS_THERMAL_SHELL_H_