// 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.

#include <fmt/format.h>

#include <glog/logging.h>

#include <cstddef>

#include <memory>

#include <ostream>

#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/column/column_vector.h"

#include "core/data_type/data_type.h"

#include "core/types.h"

#include "exprs/aggregate/aggregate_function.h"

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

#include "exprs/function/function.h"

#include "exprs/function/simple_function_factory.h"

namespace doris {

class FunctionContext;

} // namespace doris

namespace doris {

template <typename PopType>

class FunctionArrayPop : public IFunction {

public:

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

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

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

    /// Get function name.

    String get_name() const override { return PopType::name; }

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    String get_name() const override { return PopType::name; }

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    String get_name() const override { return PopType::name; }

    bool is_variadic() const override { return false; }

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    bool is_variadic() const override { return false; }

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    bool is_variadic() const override { return false; }

    size_t get_number_of_arguments() const override { return 1; }

Unexecuted instantiation: _ZNK5doris16FunctionArrayPopINS_20FunctionArrayPopbackEE23get_number_of_argumentsEv

Unexecuted instantiation: _ZNK5doris16FunctionArrayPopINS_21FunctionArrayPopfrontEE23get_number_of_argumentsEv

    DataTypePtr get_return_type_impl(const DataTypes& arguments) const override {

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

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

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

        return arguments[0];

    }

Unexecuted instantiation: _ZNK5doris16FunctionArrayPopINS_20FunctionArrayPopbackEE20get_return_type_implERKSt6vectorISt10shared_ptrIKNS_9IDataTypeEESaIS7_EE

Unexecuted instantiation: _ZNK5doris16FunctionArrayPopINS_21FunctionArrayPopfrontEE20get_return_type_implERKSt6vectorISt10shared_ptrIKNS_9IDataTypeEESaIS7_EE

    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();

        // 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()));

        }

        // prepare dst array column

        bool is_nullable = src.nested_nullmap_data != nullptr;

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

        dst.offsets_ptr->reserve(input_rows_count);

        // start from index depending on the PopType::start_offset

        auto offset_column = ColumnInt64::create(array_column->size(), PopType::start_offset);

        // len - 1

        auto length_column = ColumnInt64::create();

        for (size_t row = 0; row < src.offsets_ptr->size(); ++row) {

            size_t off = (*src.offsets_ptr)[row - 1];

            size_t len = (*src.offsets_ptr)[row] - off;

            length_column->insert_value(len - 1);

        }

        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();

    }

Unexecuted instantiation: _ZNK5doris16FunctionArrayPopINS_20FunctionArrayPopbackEE12execute_implEPNS_15FunctionContextERNS_5BlockERKSt6vectorIjSaIjEEjm

Unexecuted instantiation: _ZNK5doris16FunctionArrayPopINS_21FunctionArrayPopfrontEE12execute_implEPNS_15FunctionContextERNS_5BlockERKSt6vectorIjSaIjEEjm

};

class FunctionArrayPopback : public FunctionArrayPop<FunctionArrayPopback> {

public:

    static constexpr auto name = "array_popback";

    static constexpr int start_offset = 1;

};

class FunctionArrayPopfront : public FunctionArrayPop<FunctionArrayPopfront> {

public:

    static constexpr auto name = "array_popfront";

    static constexpr int start_offset = 2;

};

void register_function_array_pop(SimpleFunctionFactory& factory) {

    factory.register_function<FunctionArrayPopback>();

    factory.register_function<FunctionArrayPopfront>();

}

} // namespace doris