#pragma once

#include <cstdint> //uint64_t
//#include <stdexcept> // std::runtime_error

#include "utils/vector.h"
#include "utils/matrix.h"

namespace numerics::detail{
	
	// ---------------- Matrix -> Scalar ----------------
	template <typename T>
	T sum_serial(const utils::Matrix<T>& A) {
	    const uint64_t rows = A.rows();
	    const uint64_t cols = A.cols();
		T sum = T{0};
		for (uint64_t i = 0; i < rows; ++i){
			for (uint64_t j = 0; j < cols; ++j){
				sum += A(i,j);
			}
		}
		return sum;
	}

	// ---------------- Vector -> Scalar ----------------
	template <typename T>
	T sum_serial(const utils::Vector<T>& v) {
		const uint64_t N = v.size();
		T sum = T{0};
		for (uint64_t i = 0; i < N; ++i){
			sum += v[i];
		}
		return sum;
	}

	// ---------------- Matrix -> Vector ----------------
	template <typename T>
	utils::Vector<T> sum_rowwise_serial(const utils::Matrix<T>& A) {
	    const uint64_t rows = A.rows();
	    const uint64_t cols = A.cols();
		utils::Vector<T> sum(cols, T{0});
		for (uint64_t i = 0; i < rows; ++i){
			for (uint64_t j = 0; j < cols; ++j){
				sum[j] += A(i,j);
			}
		}
		return sum;
	}

	template <typename T>
	utils::Vector<T> sum_colwise_serial(const utils::Matrix<T>& A) {
	    const uint64_t rows = A.rows();
	    const uint64_t cols = A.cols();
		utils::Vector<T> sum(rows, T{0});
		for (uint64_t i = 0; i < rows; ++i){
			for (uint64_t j = 0; j < cols; ++j){
				sum[i] += A(i,j);
			}
		}
		return sum;
	}
} // namespace numerics