#pragma once
#include "vde/core/point.h"
#include <vector>

namespace vde::curves {

class BezierSurface {
public:
    BezierSurface(std::vector<std::vector<Point3D>> control_grid);

    [[nodiscard]] Point3D evaluate(double u, double v) const;
    [[nodiscard]] Vector3D derivative_u(double u, double v) const;
    [[nodiscard]] Vector3D derivative_v(double u, double v) const;
    [[nodiscard]] Vector3D normal(double u, double v) const;

    [[nodiscard]] int degree_u() const { return static_cast<int>(cp_.size()) - 1; }
    [[nodiscard]] int degree_v() const { return static_cast<int>(cp_[0].size()) - 1; }

private:
    std::vector<std::vector<Point3D>> cp_;
    [[nodiscard]] Point3D de_casteljau(double t, const std::vector<Point3D>& pts) const;
};

}  // namespace vde::curves