// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// to you under the Apache License, Version 2.0 (the

// "License"); you may not use this file except in compliance

// with the License.  You may obtain a copy of the License at

//

//   http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing,

// software distributed under the License is distributed on an

// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

// KIND, either express or implied.  See the License for the

// specific language governing permissions and limitations

// under the License.

#pragma once

#include <fmt/format.h>

#include <glog/logging.h>

#include <stddef.h>

#include <memory>

#include <ostream>

#include <string>

#include <utility>

#include "common/status.h"

#include "core/block/block.h"

#include "core/block/column_numbers.h"

#include "core/block/column_with_type_and_name.h"

#include "core/column/column.h"

#include "core/data_type/data_type.h"

#include "core/types.h"

#include "exprs/function/array/function_array_utils.h"

#include "exprs/function/function.h"

namespace doris {

class FunctionContext;

} // namespace doris

namespace doris {

class FunctionArraySlice : public IFunction {

public:

    static constexpr auto name = "array_slice";

    static FunctionPtr create() { return std::make_shared<FunctionArraySlice>(); }

    /// Get function name.

    String get_name() const override { return name; }

    bool is_variadic() const override { return true; }

    size_t get_number_of_arguments() const override { return 0; }

    DataTypePtr get_return_type_impl(const DataTypes& arguments) const override {

        DCHECK(arguments[0]->get_primitive_type() == TYPE_ARRAY)

                << "First argument for function: " << name

                << " should be DataTypeArray but it has type " << arguments[0]->get_name() << ".";

        DCHECK(is_int_or_bool(arguments[1]->get_primitive_type()))

                << "Second argument for function: " << name << " should be Integer but it has type "

                << arguments[1]->get_name() << ".";

        if (arguments.size() > 2) {

            DCHECK(is_int_or_bool(arguments[2]->get_primitive_type()))

                    << "Third argument for function: " << name

                    << " should be Integer but it has type " << arguments[2]->get_name() << ".";

        }

        return arguments[0];

    }

    Status execute_impl(FunctionContext* context, Block& block, const ColumnNumbers& arguments,

                        uint32_t result, size_t input_rows_count) const override {

        auto array_column =

                block.get_by_position(arguments[0]).column->convert_to_full_column_if_const();

        auto offset_column =

                block.get_by_position(arguments[1]).column->convert_to_full_column_if_const();

        ColumnPtr length_column = nullptr;

        if (arguments.size() > 2) {

            length_column =

                    block.get_by_position(arguments[2]).column->convert_to_full_column_if_const();

        }

        // extract src array column

        ColumnArrayExecutionData src;

        if (!extract_column_array_info(*array_column, src)) {

            return Status::RuntimeError(

                    fmt::format("execute failed, unsupported types for function {}({}, {})",

                                get_name(), block.get_by_position(arguments[0]).type->get_name(),

                                block.get_by_position(arguments[1]).type->get_name()));

        }

        // prepare dst array column

        bool is_nullable = src.nested_nullmap_data ? true : false;

        ColumnArrayMutableData dst = create_mutable_data(src.nested_col.get(), is_nullable);

        dst.offsets_ptr->reserve(input_rows_count);

        // execute

        slice_array(dst, src, *offset_column, length_column.get());

        ColumnPtr res_column = assemble_column_array(dst);

        block.replace_by_position(result, std::move(res_column));

        return Status::OK();

    }

};

} // namespace doris