// Copyright (C) 2018-2026 Intel Corporation
// SPDX-License-Identifier: Apache-2.0
//

#pragma once

#include <cstdio>
#include <numeric>
#include <vector>

#include "openvino/core/attribute_adapter.hpp"
#include "openvino/core/axis_set.hpp"
#include "openvino/core/core_visibility.hpp"
#include "openvino/core/strides.hpp"

namespace ov {
/**
 * @brief Shape for a tensor.
 * @ingroup ov_model_cpp_api
 */
class Shape : public std::vector<size_t> {
public:
    OPENVINO_API Shape();

    OPENVINO_API Shape(const std::initializer_list<size_t>& axis_lengths);

    OPENVINO_API Shape(const std::vector<size_t>& axis_lengths);

    OPENVINO_API Shape(const std::string& shape);

    OPENVINO_API Shape(const Shape& axis_lengths);

    OPENVINO_API explicit Shape(size_t n, size_t initial_value = 0);

    OPENVINO_API ~Shape();

    template <class InputIterator>
    Shape(InputIterator first, InputIterator last) : std::vector<size_t>(first, last) {}

    OPENVINO_API Shape& operator=(const Shape& v);
    OPENVINO_API Shape& operator=(Shape&& v) noexcept;
    OPENVINO_API std::string to_string() const;

    /**
     * @brief Gets dimension at index.
     *
     * @param i  Index to shape dimension [-rank, rank).
     *
     * @return A reference to i-th dimension of this shape.
     */
    OPENVINO_API typename Shape::reference operator[](std::ptrdiff_t i);

    /**
     * @brief Gets dimension at index.
     *
     * @param i  Index to shape dimension [-rank, rank).
     *
     * @return A const reference to i-th dimension of this shape.
     */
    OPENVINO_API typename Shape::const_reference operator[](std::ptrdiff_t i) const;

    /**
     * @brief Gets dimension at index, with bounds checking.
     *
     * @param i  Index to shape dimension [-rank, rank).
     *
     * @return A reference to i-th dimension of this shape.
     */
    OPENVINO_API typename Shape::reference at(std::ptrdiff_t i);

    /**
     * @brief Gets dimension at index, with bounds checking.
     *
     * @param i  Index to shape dimension [-rank, rank).
     *
     * @return A const reference to i-th dimension of this shape.
     */
    OPENVINO_API typename Shape::const_reference at(std::ptrdiff_t i) const;
};

/**
 * Number of elements in a subset of dimensions of a shape.
 * Returns a product of dimensions in a range [start_dim;end_dim)
 * @ingroup ov_model_cpp_api
 */
template <typename ForwardIt>
size_t shape_size(ForwardIt start_dim, const ForwardIt end_dim) {
    static_assert(std::is_arithmetic<typename std::iterator_traits<ForwardIt>::value_type>::value,
                  "shape_size expects 2 forward iterators as inputs. value_type of those iterators has to be an "
                  "arithmetic type so that they can be used in multiplication operation.");

    return std::accumulate(start_dim,
                           end_dim,
                           typename std::iterator_traits<ForwardIt>::value_type{1},
                           std::multiplies<typename std::iterator_traits<ForwardIt>::value_type>());
}

/**
 * @brief Number of elements in spanned by a shape
 * @ingroup ov_model_cpp_api
 */
template <typename SHAPE_TYPE>
size_t shape_size(const SHAPE_TYPE& shape) {
    return shape_size(shape.begin(), shape.end());
}

/// Row-major strides for a shape
template <typename SHAPE_TYPE>
std::vector<size_t> row_major_strides(const SHAPE_TYPE& shape) {
    std::vector<size_t> strides(shape.size());
    size_t s = 1;
    auto st = strides.rbegin();
    for (auto d = shape.rbegin(); d != shape.rend() && st != strides.rend(); d++, st++) {
        *st = s;
        s *= *d;
    }
    return strides;
}

template <typename SHAPE_TYPE>
size_t row_major_stride(const SHAPE_TYPE& shape, size_t axis) {
    size_t s = 1;
    for (size_t i = shape.size(); i-- > axis + 1;) {
        s *= shape[i];
    }
    return s;
}

template <typename SHAPE_TYPE>
inline bool is_scalar(const SHAPE_TYPE& shape) {
    return 0 == shape.size();
}

template <typename SHAPE_TYPE>
inline bool is_vector(const SHAPE_TYPE& shape) {
    return 1 == shape.size();
}

OPENVINO_API
std::ostream& operator<<(std::ostream& s, const Shape& shape);

template <>
class OPENVINO_API AttributeAdapter<ov::Shape> : public IndirectVectorValueAccessor<ov::Shape, std::vector<int64_t>> {
public:
    OPENVINO_RTTI("AttributeAdapter<Shape>");

    AttributeAdapter(ov::Shape& value) : IndirectVectorValueAccessor<ov::Shape, std::vector<int64_t>>(value) {}
    ~AttributeAdapter() override;
};
}  // namespace ov
