#pragma once
#include <iostream>
#include <cstring>
#include <cmath>
#include <cassert>
#include <functional>
#include <stdint.h>
#include "config.hpp"

#define BUFFER_SIZE 256
#define STRING_INT_SIZE 8 // Length of a number in log10 (including '-')

#ifndef __CUDACC__
#define __host__
#define __device__
#endif

typedef float float32_t;
typedef double float64_t;
typedef long double float128_t;

namespace np {
	constexpr const float64_t inf = std::numeric_limits<float64_t>::infinity();

	typedef struct Slice {
		size_t x = 0, y = 0, z = 0;
	} Slice;

	typedef struct Shape {
		size_t length = 0;
		size_t* data = nullptr;
		size_t* refcount = nullptr;
#if __DEBUG
		size_t total = 1;
#endif

		__host__ __device__
		Shape(void) noexcept {
#if __DEBUG
			printf("Shape created (default)\n");
#endif
		}

		__host__ __device__
		Shape(const size_t& length, size_t* const data) noexcept : length(length), data(data), refcount(new size_t(1)) {
#if __DEBUG
			printf("Shape created (raw)\n");
			for(size_t i = 0; i < length; ++i)
				total *= data[i];
#endif
		}

		__host__ __device__
		Shape(const std::initializer_list<size_t>& dims) noexcept : length(dims.size()), data(new size_t[dims.size()]), refcount(new size_t(1)) {
#if __DEBUG
			printf("Shape created (initializer)\n");
#endif
			const size_t* const begin = dims.begin();
			for(size_t i = 0; i < length; ++i){
				data[i] = begin[i];
#if __DEBUG
				total *= data[i];
#endif
			}
		}

		__host__ __device__
		Shape(const Shape& shape) noexcept {
#if __DEBUG
			printf("Shape created (copy)\n");
#endif
			if (data != nullptr && data != shape.data){
#if __DEBUG
				printf("Former shape deleted (copy)\n");
#endif
				delete[] data;
			}
			if (refcount != nullptr && refcount != shape.refcount){
#if __DEBUG
				printf("Former shape refcount freed (copy)\n");
#endif
				delete refcount;
			}
			length = shape.length;
			data = shape.data;
			refcount = shape.refcount;

			if (refcount != nullptr)
				(*refcount)++;
#if __DEBUG
			else
				printf("Moved shape has null refcount\n");
#endif
#if __DEBUG
			total = shape.total;
#endif
		}

		__host__ __device__
		Shape(Shape&& shape) noexcept {
#if __DEBUG
			printf("Shape created (move)\n");
#endif
			if (data != nullptr && data != shape.data){
#if __DEBUG
				printf("Former shape deleted (move)\n");
#endif
				delete[] data;
			}
			if (refcount != nullptr && refcount != shape.refcount){
#if __DEBUG
				printf("Former shape refcount freed (move)\n");
#endif
				delete refcount;
			}
			length = shape.length;
			data = shape.data;
			refcount = shape.refcount;

			shape.length = 0;
			shape.data = nullptr;
			shape.refcount = nullptr;
#if __DEBUG
			total = shape.total;
			shape.total = 1;
#endif
		}

		__host__ __device__
		~Shape(void) noexcept {
			if(refcount == nullptr){
#if __DEBUG
					printf("Shape refcount freed more than once\n");
#endif
					return;
			}
			--(*refcount);
#if __DEBUG
			printf("Shape destructed : %lu\n", *refcount);
#endif
			if(*refcount == 0){
				if (data != nullptr){
					delete[] data;
					data = nullptr;
#if __DEBUG
					printf("Shape freeing ...\n");
#endif
				}
#if __DEBUG
				else
					printf("Shape freed more than once : %lu\n", *refcount);
#endif
				delete refcount;
				refcount = nullptr;
#if __DEBUG
				total = 1;
#endif
			}
		}

		__host__ __device__
		Shape& operator=(const Shape& shape) noexcept {
#if __DEBUG
			printf("Shape created (assign copy)\n");
#endif
			if (data != nullptr && data != shape.data){
#if __DEBUG
				printf("Former shape deleted (assign copy)\n");
#endif
				delete[] data;
			}
			if (refcount != nullptr && refcount != shape.refcount){
#if __DEBUG
				printf("Former shape refcount freed (assign copy)\n");
#endif
				delete refcount;
			}
			length = shape.length;
			data = shape.data;
			refcount = shape.refcount;

			if (refcount != nullptr)
				(*refcount)++;
#if __DEBUG
			else
				printf("Assigned copy shape has null refcount\n");
			total = shape.total;
#endif
			return *this;
		}

		__host__ __device__
		Shape& operator=(Shape&& shape) noexcept {
#if __DEBUG
			printf("Shape created (assign move)\n");
#endif
			if (data != nullptr && data != shape.data){
#if __DEBUG
				printf("Former shape deleted (assign move)\n");
#endif
				delete[] data;
			}
			if (refcount != nullptr && refcount != shape.refcount){
#if __DEBUG
				printf("Former shape refcount freed (assign move)\n");
#endif
				delete refcount;
			}
			length = shape.length;
			data = shape.data;
			refcount = shape.refcount;
#if __DEBUG
			if (refcount == nullptr)
				printf("Assigned copy shape has null refcount\n");
			total = shape.total;
			shape.total = 1;
#endif
			shape.length = 0;
			shape.data = nullptr;
			shape.refcount = nullptr;
			return *this;
		}


		__host__ __device__
		constexpr size_t& operator[](const size_t& i) const {
#if __DEBUG
		if (i > length){
			printf("Index %lu out of shape length %lu\n", i, length);
	#ifndef __CUDACC__
			throw std::out_of_range("Index out of shape size");
	#endif
		}
#endif
			return data[i];
		}

		constexpr bool operator==(const Shape& other) const noexcept {
			if (length != other.length)
				return false;
#if __DEBUG
			if (total != other.total)
				return false;
#endif
			for(size_t i = 0; i < length; ++i)
				if (data[i] != other[i])
					return false;
			return true;
		}

		constexpr bool operator!=(const Shape& other) const noexcept {
			return !(*this == other);
		}
	} Shape;

	__host__ __device__
	size_t prod(const Shape&, const size_t& = 0) noexcept;

	template<typename T>
	struct Array {
		Shape shape;
		T* data = nullptr;
		size_t* refcount = nullptr;

		__host__ __device__
		Array(void) noexcept {
#if __DEBUG
			printf("Array created (default)\n");
#endif
		}

		__host__ __device__
		Array(const Shape& shape, T* const data) noexcept : shape(shape), data(data), refcount(new size_t(1)) {
#if __DEBUG
			printf("Array created (raw, copy shape)\n");
#endif
		}

		__host__ __device__
		Array(const Shape& shape) noexcept : shape(shape), data(new T[np::prod(shape)]), refcount(new size_t(1)) {
#if __DEBUG
			printf("Array created (raw empty, copy shape)\n");
#endif
		}

		__host__ __device__
		Array(Shape&& shape, T* const data) noexcept : shape(shape), data(data), refcount(new size_t(1)) {
#if __DEBUG
			printf("Array created (raw, move shape)\n");
#endif
		}

		__host__ __device__
		Array(Shape&& shape) noexcept : shape(shape), data(new T[np::prod(shape)]), refcount(new size_t(1)) {
#if __DEBUG
			printf("Array created (raw empty, move shape)\n");
#endif
		}

		__host__ __device__
		Array(const Array& array) noexcept : shape(array.shape) {
#if __DEBUG
			printf("Array created (copy)\n");
#endif
			if (data != nullptr && data != array.data){
#if __DEBUG
				printf("Former array deleted (copy)\n");
#endif
				delete[] data;
			}
			if (refcount != nullptr && refcount != array.refcount){
#if __DEBUG
				printf("Former array refcount freed (copy)\n");
#endif
				delete refcount;
			}

			data = array.data;
			refcount = array.refcount;
			if (refcount != nullptr)
				(*refcount)++;
#if __DEBUG
			else
				printf("Moved array has null refcount\n");
#endif
		}

		__host__ __device__
		Array(Array&& array) noexcept : shape(std::move(array.shape)) {
#if __DEBUG
			printf("Array created (move)\n");
#endif
			if (data != nullptr && data != array.data){
#if __DEBUG
				printf("Former array deleted (move)\n");
#endif
				delete[] data;
			}
			if (refcount != nullptr && refcount != array.refcount){
#if __DEBUG
				printf("Former array refcount freed (move)\n");
#endif
				delete refcount;
			}
			data = array.data;
			refcount = array.refcount;

			array.data = nullptr;
			array.refcount = nullptr;
		}

		__host__ __device__
		~Array(void) noexcept {
			if(refcount == nullptr){
#if __DEBUG
				printf("Array refcount freed more than once\n");
#endif
				return;
			}
			--(*refcount);
#if __DEBUG
			printf("Array destructed : %lu\n", *refcount);
#endif
			if(*refcount == 0){
				if (data != nullptr){
					delete[] data;
					data = nullptr;
#if __DEBUG
					printf("Array freeing ...\n");
#endif
				}
#if __DEBUG
				else
					printf("Array freed more than once : %lu\n", *refcount);
#endif
				delete refcount;
				refcount = nullptr;
			}
		}

		__host__ __device__
		Array& operator=(const Array& array) noexcept {
#if __DEBUG
			printf("Array created (assign copy)\n");
#endif
			if (data != nullptr && data != array.data){
#if __DEBUG
				printf("Former array deleted (assign copy)\n");
#endif
				delete[] data;
			}
			if (refcount != nullptr && refcount != array.refcount){
#if __DEBUG
				printf("Former array refcount freed (assign copy)\n");
#endif
				delete refcount;
			}
			shape = array.shape;
			data = array.data;
			refcount = array.refcount;

			if (refcount != nullptr)
				(*refcount)++;
#if __DEBUG
			else
				printf("Assigned array has null refcount\n");
#endif
			return *this;
		}

		__host__ __device__
		Array& operator=(Array&& array) noexcept {
#if __DEBUG
			printf("Array created (assign move)\n");
#endif
			if (data != nullptr && data != array.data){
#if __DEBUG
				printf("Former array deleted (assign move)\n");
#endif
				delete[] data;
			}
			if (refcount != nullptr && refcount != array.refcount){
#if __DEBUG
				printf("Former array refcount freed (assign move)\n");
#endif
				delete refcount;
			}
			shape = std::move(array.shape);
			data = array.data;
			refcount = array.refcount;

			array.refcount = nullptr;
			array.data = nullptr;

			return *this;
		}

		__host__ __device__
		constexpr T& operator[](const size_t& i) const;
		// bool operator==(const Array& other) const noexcept;
		template<typename F>
		Array<T>& operator/=(const F& value) noexcept;
		// Array<T>& operator*=(const T& value) noexcept;
		template<typename F>
		Array<T>& operator*=(const Array<F>& other);
		template<typename F>
		Array<T>& operator+=(const Array<F>& other);
		template<typename F>
		Array<T> operator*(const Array<F>& other) const;
		// template<typename F>
		// Array<T> operator*(const F& other) const;
		template<typename F>
		Array<T> operator-(const np::Array<F>& other) const;
		template<typename F>
		Array<T> operator-(const F& other) const;
	};

	template<typename T>
	inline Array<T> empty(Shape&& shape) noexcept {
		return Array<T>(shape);
	}

	template<typename T>
	inline Array<T> empty(const Shape& shape) noexcept {
		return Array<T>(shape);
	}

	template<typename T>
	inline Array<T> empty(const std::initializer_list<size_t>& dims) noexcept {
		return Array<T>(dims);
	}

	template<typename T>
	Array<T> zeros(Shape&& shape) noexcept {
		Array<T> res(shape);
		memset(res.data, 0, sizeof(T) * np::prod(res.shape));
		return res;
	}

	template<typename T>
	Array<T> zeros(const Shape& shape) noexcept {
		Array<T> res(shape);
		memset(res.data, 0, sizeof(T) * np::prod(res.shape));
		return res;
	}

	template<typename T>
	Array<T> zeros(const std::initializer_list<size_t>& dims) noexcept {
		Array<T> res(dims);
		memset(res.data, 0, sizeof(T) * np::prod(res.shape));
		return res;
	}

	template<typename T>
	__host__ __device__
	constexpr T& Array<T>::operator[](const size_t& i) const {
#if __DEBUG
		if (i > shape.total){
			printf("Index %lu out of array size %lu\n", i, shape.total);
	#ifndef __CUDACC__
			throw std::out_of_range("Index out of array size");
	#endif
		}
#endif
		return data[i];
	}

	// bool Array<T>::operator==(const Array& other) const noexcept {
	// 	if (shape != other.shape)
	// 		return false;
	// 	const size_t length = np::prod(shape);
	// 	for(size_t i = 0; i < length; ++i)
	// 		if (data[i] != other[i])
	// 			return false;
	// 	return true;
	// }

	template<typename T>
	template<typename F>
	Array<T>& Array<T>::operator/=(const F& value) noexcept {
		const size_t total = prod(shape);
		for(size_t i = 0; i < total; ++i)
			data[i] /= value;
		return *this;
	}

	// template<typename T>
	// Array<T>& Array<T>::operator*=(const T& value) noexcept {
	// 	const size_t total = prod(shape);
	// 	for(size_t i = 0; i < total; ++i)
	// 		data[i] *= value;
	// 	return *this;
	// }

	template<typename T>
	template<typename F>
	Array<T> Array<T>::operator*(const Array<F>& other) const {
#if __DEBUG
		if (shape != other.shape){
			printf("Incompatible shapes\n");
			throw;
		}
#endif
		np::Array<T> res = np::empty<T>(shape);
		const size_t total = prod(shape);
		for(size_t i = 0; i < total; ++i)
			res[i] = data[i] * other[i];
		return res;
	}

	// template<typename T>
	// template<typename F>
	// Array<T> Array<T>::operator*(const F& value) const {
	// 	np::Array<T> res = np::empty<T>(shape);
	// 	const size_t total = prod(shape);
	// 	for(size_t i = 0; i < total; ++i)
	// 		res[i] = data[i] * value;
	// 	return res;
	// }

	// template<typename T, typename F>
	// Array<T> operator*(const F& value, const Array<T>& other) {
	// 	np::Array<T> res = np::empty<T>(other.shape);
	// 	const size_t total = prod(other.shape);
	// 	for(size_t i = 0; i < total; ++i)
	// 		res[i] = other[i] * value;
	// 	return res;
	// }

	template<typename T>
	template<typename F>
	Array<T>& Array<T>::operator*=(const Array<F>& other) {
#if __DEBUG
		if (shape != other.shape){
			printf("Incompatible shapes\n");
			throw;
		}
#endif
		const size_t total = prod(shape);
		for(size_t i = 0; i < total; ++i)
			data[i] *= other[i];
		return *this;
	}

	template<typename T>
	template<typename F>
	Array<T>& Array<T>::operator+=(const Array<F>& other) {
#if __DEBUG
		if (shape != other.shape){
			printf("Incompatible shapes\n");
			throw;
		}
#endif
		const size_t total = prod(shape);
		for(size_t i = 0; i < total; ++i)
			data[i] += other[i];
		return *this;
	}

	template<typename T>
	template<typename F>
	Array<T> Array<T>::operator-(const F& other) const {
		np::Array<T> res = np::empty<T>(shape);
		const size_t total = prod(shape);
		for(size_t i = 0; i < total; ++i)
			res[i] = data[i] - other;
		return res;
	}

	template<typename T>
	template<typename F>
	Array<T> Array<T>::operator-(const np::Array<F>& other) const {
#if __DEBUG
		if (shape != other.shape){
			printf("Incompatible shapes\n");
			throw;
		}
#endif
		np::Array<T> res = np::empty<T>(shape);
		const size_t total = prod(shape);
		for(size_t i = 0; i < total; ++i)
			res[i] = data[i] - other[i];
		return res;
	}

	// template<typename T>
	// T prod(const Array<T>& array, const size_t& offset = 0) noexcept {
	// 	T result = array[offset];
	// 	const size_t total = prod(array.shape);
	// 	for(size_t i = 1 + offset; i < total; ++i)
	// 		result *= array[i];
	// 	return result;
	// }

	template<typename T>
	T sum(const Array<T>& array) noexcept {
		T result = array[0];
		const size_t total = prod(array.shape);
		for(size_t i = 1; i < total; ++i)
			result += array[i];
		return result;
	}

	template<typename T, typename F>
	F mean(const Array<T>& array) noexcept {
		T result = array[0];
		const size_t total = prod(array.shape);
		for(size_t i = 1; i < total; ++i)
			result += array[i];
		return result / total;
	}

	template<typename T>
	float64_t mean(const Array<T>& array) noexcept {
		return mean<float64_t, T>(array);
	}

	template<typename T>
	np::Array<T> abs(const Array<T>& array) noexcept {
		np::Array<T> result = np::empty<T>(array.shape);
		const size_t total = prod(array.shape);
		for(size_t i = 0; i < total; ++i)
			result[i] = std::abs(array[i]);
		return result;
	}

	template<typename T, typename F>
	np::Array<T> pow(const F& k, const Array<T>& array) noexcept {
		np::Array<T> result = np::empty<T>(array.shape);
		const size_t total = prod(array.shape);
		for(size_t i = 0; i < total; ++i)
			result[i] = std::pow(k, array[i]);
		return result;
	}

	//template<typename T>
	//T max(const Array<T>& array) noexcept {
	//	T result = array[0];
	//	for(size_t i = 1; i < prod(array.shape); ++i)
	//		if(array[i] > result)
	//			result = array[i];
	//	return result;
	//}

	//template<typename T>
	//T min(const Array<T>& array) noexcept {
	//	T result = array[0];
	//	for(size_t i = 1; i < prod(array.shape); ++i)
	//		if(array[i] < result)
	//			result = array[i];
	//	return result;
	//}

	template<typename T, typename F>
	Array<T> astype(const Array<F>& array) noexcept {
		Array<T> res = empty<T>(array.shape);
		const size_t total = prod(array.shape);
		for(size_t i = 0; i < total; ++i)
			res[i] = static_cast<T>(array[i]);
		return res;
	}

	template<typename T>
	Array<T> operator-(const T& k, const Array<T>& other) noexcept {
		np::Array<T> res = empty<T>(other.shape);
		const size_t total = prod(other.shape);
		for(size_t i = 0; i < total; ++i)
			res[i] = k - other[i];
		return res;
	}

	template<typename T>
	__host__ __device__
	constexpr T min(const T& lhs, const T& rhs) noexcept {
		return lhs < rhs ? lhs : rhs;
	}

	// template<typename T>
	// __host__ __device__
	// constexpr T max(const T& lhs, const T& rhs) noexcept {
	// 	return lhs > rhs ? lhs : rhs;
	// }
};

template<typename T>
constexpr np::Array<T>& map(np::Array<T>& a, const T(&fnc)(const size_t& i, const T& v)) noexcept {
	return std::function<T(const size_t&, const T&)>(fnc);
}

template<typename T>
constexpr np::Array<T>& map(np::Array<T>& a, const std::function<T(const size_t&, const T&)>& fnc) noexcept {
	const size_t a_length = np::prod(a.shape);
	for (size_t i = 0; i < a_length; ++i)
		a[i] = fnc(i, a[i]);
	return a;
}

//template<typename T>
//constexpr void foreach(const np::Array<T>& a, const void(&fnc)(const size_t&, const T&)) noexcept {
//	return std::function<void(const size_t&, const T&)>(fnc);
//}

//template<typename T>
//constexpr void foreach(const np::Array<T>& a, const std::function<void(const size_t&, const T&)>& fnc) noexcept {
//	for (size_t i = 0; i < a.length; ++i)
//		fnc(i, a[i]);
//}

template<typename T>
__host__ __device__
constexpr inline static void swap(T* const a, T* const b) noexcept {
	if (a == b) return;
	const T temp = *a;
	*a = *b;
	*b = temp;
}

template<typename T>
static int32_t qs_partition(const np::Array<T>& a, const int32_t& l, const int32_t& h) noexcept {
	int32_t i = l - 1;
	for (int32_t j = l; j <= h; ++j)
		if (a[j] < a[h])
			swap(&a[++i], &a[j]);
	swap(&a[++i], &a[h]);
	return i;
}

template<typename T>
void quicksort(const np::Array<T>& a, const int32_t& l, const int32_t& h) noexcept {
	if (l >= h)
		return;
	const int32_t p = qs_partition(a, l, h);
	quicksort(a, l, p - 1);
	quicksort(a, p + 1, h);
}

template<typename T>
void quicksort(const np::Array<T>& a) noexcept {
	quicksort(a, 0, a.length - 1);
}

template<typename T>
static size_t as_partition(const T* const a, uint16_t* const indices, const size_t& l, const size_t& h) noexcept {
	size_t i = l - 1;
	for (size_t j = l; j <= h; ++j)
		if (a[indices[j]] < a[indices[h]])
			swap(&indices[++i], &indices[j]);
	swap(&indices[++i], &indices[h]);
	return i;
}

std::array<np::Array<uint8_t>, 4> load_datasets(void);
void print_error_file(const char* const) noexcept;

template<typename T>
void save(const np::Array<T>& d, const char* const filename) {
	FILE* const output = fopen(filename, "wb");
	if (output == NULL) {
		print_error_file(filename);
		throw;
	}
	assert(d.shape.refcount != 0);
	fwrite(&d.shape.length, sizeof(size_t), 1, output);
	fwrite(d.shape.data, sizeof(size_t), d.shape.length, output);
	assert(d.refcount != 0);
	fwrite(d.data, sizeof(T), np::prod(d.shape), output);
	fclose(output);
}

template<typename T>
np::Array<T> load(const char* const filename) {
	FILE* const input = fopen(filename, "rb");
	if (input == NULL) {
		print_error_file(filename);
		throw;
	}
	size_t length = 0;
	if(!fread(&length, sizeof(size_t), 1, input)){
		print_error_file(filename);
		fclose(input);
		throw;
	}
	size_t* const data = new size_t[length];
	if(!fread(data, sizeof(size_t), length, input)){
		print_error_file(filename);
		fclose(input);
		throw;
	}
	np::Array<T> d = np::empty<T>(np::Shape(length, data));
	if(!fread(d.data, sizeof(T), np::prod(d.shape), input)){
		print_error_file(filename);
		fclose(input);
		throw;
	}
	fclose(input);
	return d;
}

#ifdef __CUDACC__
template<typename T>
np::Array<T> copyToDevice(const char* const name, const np::Array<T>& array) noexcept {
	const size_t array_size = np::prod(array.shape) * sizeof(T);
	const size_t shape_size = array.shape.length * sizeof(size_t);
	np::Array<T> d_array;
	//_print_cuda_error_(name, cudaMalloc(&d_array.refcount, sizeof(size_t)));
	_print_cuda_error_(name, cudaMalloc(&d_array.data, array_size));
	//_print_cuda_error_(name, cudaMalloc(&d_array.shape.refcount, sizeof(size_t)));
	_print_cuda_error_(name, cudaMalloc(&d_array.shape.data, shape_size));
	d_array.shape.length = array.shape.length;
	//_print_cuda_error_(name, cudaMemcpy(d_array.refcount, array.refcount, sizeof(size_t), cudaMemcpyHostToDevice));
	_print_cuda_error_(name, cudaMemcpy(d_array.data, array.data, array_size, cudaMemcpyHostToDevice));
	//_print_cuda_error_(name, cudaMemcpy(d_array.shape.refcount, array.shape.refcount, sizeof(size_t), cudaMemcpyHostToDevice));
	_print_cuda_error_(name, cudaMemcpy(d_array.shape.data, array.shape.data, shape_size, cudaMemcpyHostToDevice));
#if __DEBUG
	d_array.shape.total = np::prod(array.shape);
#endif
	return d_array;
}

template<typename T>
constexpr void cudaFree(const char* const name, np::Array<T>& array) noexcept {
	//_print_cuda_error_(name, cudaFree(array.refcount));
	//array.refcount = nullptr;
	_print_cuda_error_(name, cudaFree(array.data));
	array.data = nullptr;
	//_print_cuda_error_(name, cudaFree(array.shape.refcount));
	//array.shape.refcount = nullptr;
	_print_cuda_error_(name, cudaFree(array.shape.data));
	array.shape.data = nullptr;
}

constexpr inline void _print_cuda_error_(const char* const name, const cudaError_t& err) noexcept {
	if (err != cudaSuccess) fprintf(stderr, "Error: %s = %d : %s\n", name, err, cudaGetErrorString(err));
}
#endif

int32_t print(const np::Shape&) noexcept;
int32_t print(const np::Array<uint8_t>&) noexcept;
int32_t print(const np::Array<float64_t>&) noexcept;
int32_t print(const np::Array<uint8_t>&, const np::Slice&) noexcept;
int32_t print(const np::Array<uint32_t>&, const np::Slice&) noexcept;
int32_t print(const np::Array<int32_t>&, const np::Slice&) noexcept;
int32_t print(const np::Array<uint16_t>&, const np::Slice&) noexcept;
int32_t print_feat(const np::Array<uint8_t>&, const np::Slice&) noexcept;