#pragma once

#include <integrand_handle.hpp>
#include <fwd_types.hpp>

#include <macros.h>

struct SIv2_API integrator {
    auto eval_surf_int_by(const integrand_handle_base& handle) const
    {
        double result{};
        for (auto i = 0; i < integral_points.size(); ++i) {
            for (auto j = 0; j < integral_points[i].size(); ++j) {
                const auto& p  = integral_points[i][j];
                result        += surface_integral_weights[i][j] * handle.f(p.x(), p.y(), p.z());
            }
        }

        return result * handle.w_without_grad();
    }

    auto eval_volu_int_by(const integrand_handle_base& handle) const
    {
        double result{};
        for (auto i = 0; i < integral_points.size(); ++i) {
            for (auto j = 0; j < integral_points[i].size(); ++j) {
                const auto& p  = integral_points[i][j];
                result        += volume_integral_weights[i][j] * handle.f(p.x(), p.y(), p.z());
            }
        }

        return result * handle.w();
    }

    std::vector<std::vector<Eigen::Vector4d>> integral_points{};
    std::vector<std::vector<double>>          surface_integral_weights{};
    std::vector<std::vector<double>>          volume_integral_weights{};
};