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// Copyright (c) 2020 Chris Richardson
// FEniCS Project
// SPDX-License-Identifier: MIT
#pragma once
#include <Eigen/Dense>
#include <vector>
namespace basix
{
/// Information about reference cells including their topological and
/// geometric data.
namespace cell
{
/// Cell type
enum class type
{
point,
interval,
triangle,
tetrahedron,
quadrilateral,
hexahedron,
prism,
pyramid
};
/// Cell geometry
/// @param celltype Cell Type
/// @return Set of vertex points of the cell
Eigen::ArrayXXd geometry(cell::type celltype);
/// Cell topology
/// @param celltype Cell Type
/// @return List of topology (vertex indices) for each dimension (0..tdim)
std::vector<std::vector<std::vector<int>>> topology(cell::type celltype);
/// Sub-entity of a cell, given by topological dimension and index
/// @param celltype The cell::type
/// @param dim Dimension of sub-entity
/// @param index Local index of sub-entity
/// @return Set of vertex points of the sub-entity
Eigen::ArrayXXd sub_entity_geometry(cell::type celltype, int dim, int index);
/// Number of sub-entities of a cell by topological dimension
/// @param celltype The cell::type
/// @param dim Dimension of sub-entity
/// @return The number of sub-entities of the given dimension
int sub_entity_count(cell::type celltype, int dim);
/// Get the topological dimension for a given cell type
/// @param celltype Cell type
/// @return the topological dimension
int topological_dimension(cell::type celltype);
/// Get the cell type of a sub-entity of given dimension and index
/// @param celltype Type of cell
/// @param dim Topological dimension of sub-entity
/// @param index Index of sub-entity
/// @return cell type of sub-entity
cell::type sub_entity_type(cell::type celltype, int dim, int index);
/// Convert a cell type string to enum
/// @param name String
/// @return cell type
cell::type str_to_type(std::string name);
/// Convert cell type enum to string
const std::string& type_to_str(cell::type type);
} // namespace cell
} // namespace basix
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