#pragma once

#include <base/subface.hpp>

namespace internal
{
// local: plane x=0
struct plane_t final : subface {
    static constexpr uint64_t             max_degree  = 1;
    static constexpr equation_system_type eq_sys_type = equation_system_type::implicit;

    std::function<double(Eigen::Vector3d)>          fetch_sdf_evaluator() const override;
    std::function<Eigen::Vector3d(Eigen::Vector3d)> fetch_sdf_grad_evaluator() const override;

    // u: planar local x-axis
    // v: planar local y-axis
    std::function<Eigen::Vector4d(double, double)> fetch_point_by_param_evaluator() const override;
    std::function<Eigen::Vector2d(Eigen::Vector3d)> fetch_param_mapping_evaluator() const override;

    std::function<constraint_curve_intermediate(double)> fetch_curve_constraint_evaluator(parameter_u_t constraint_var_type,
                                                                                          double        u) const override;
    std::function<constraint_curve_intermediate(double)> fetch_curve_constraint_evaluator(parameter_v_t constraint_var_type,
                                                                                          double        v) const override;
    std::function<equation_intermediate_t(constraint_curve_intermediate &&)> fetch_solver_evaluator() const override;
};
} // namespace internal

namespace detail
{
struct plane_surface_tag {
};

template <>
struct tagged_hasher<internal::paired_model_matrix_ptr_t, plane_surface_tag> {
    // TODO: only plane surface should have sign problem
    size_t operator()(const internal::paired_model_matrix &block) const
    {
        const auto     &mat    = block.local_to_world.matrix();
        Eigen::Vector3d normal = mat.col(1).cross(mat.col(2)).normalized();
        if (normal.x() < 0 || (normal.x() == 0 && normal.y() < 0) || (normal.x() == 0 && normal.y() == 0 && normal.z() < 0)) {
            normal = -normal;
        }
        return hash_funcs(normal);
    }
};
} // namespace detail