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

#pragma once

#include <cmath>

#include "openvino/op/string_tensor_pack.hpp"
#include "utils.hpp"

namespace ov {
namespace op {
namespace v15 {
namespace util {
template <class TShape, class TRShape = result_shape_t<TShape>>
static void validate_indices(const size_t input_index,
                             const ITensorAccessor& tensor_accessor,
                             const StringTensorPack* op,
                             const std::vector<TShape>& input_shapes) {
    const auto& indices_shape = input_shapes[input_index];
    if (indices_shape.is_static()) {
        if (const auto data = ov::op::get_input_const_data_as<TRShape, int64_t>(op, input_index, tensor_accessor)) {
            const auto element_count = data->size();
            if (element_count > 0) {
                NODE_SHAPE_INFER_CHECK(op, input_shapes, (*data)[0] >= 0, "Indices cannot be negative.");
                const auto& symbols_shape = input_shapes[2];
                if (symbols_shape.is_static()) {
                    NODE_SHAPE_INFER_CHECK(
                        op,
                        input_shapes,
                        ov::cmp::le(data->back(), symbols_shape[0].get_length()),
                        "The biggest index cannot be higher than the amount or characters in symbols input.");
                }
                const auto are_indices_ascending = std::is_sorted(data->begin(), data->end());
                NODE_SHAPE_INFER_CHECK(op, input_shapes, are_indices_ascending, "Indices must be in ascending order.");
            }
        }
    }
}
}  // namespace util
template <class TShape, class TRShape = result_shape_t<TShape>>
std::vector<TRShape> shape_infer(const StringTensorPack* op,
                                 const std::vector<TShape>& input_shapes,
                                 const ITensorAccessor& tensor_accessor = make_tensor_accessor()) {
    NODE_SHAPE_INFER_CHECK(op, input_shapes, input_shapes.size() == 3);
    util::validate_indices(0, tensor_accessor, op, input_shapes);
    util::validate_indices(1, tensor_accessor, op, input_shapes);
    const auto& begins_shape = input_shapes[0];
    const auto& ends_shape = input_shapes[1];
    const auto& symbols_shape = input_shapes[2];
    NODE_SHAPE_INFER_CHECK(op, input_shapes, symbols_shape.rank().compatible(1), "Symbols input must be 1D.");
    auto output_shapes = std::vector<TRShape>{begins_shape};
    NODE_SHAPE_INFER_CHECK(op,
                           input_shapes,
                           TRShape::merge_into(output_shapes[0], ends_shape),
                           "The shapes of begins and ends have to be compatible.");
    return output_shapes;
}
}  // namespace v15
}  // namespace op
}  // namespace ov
