// 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 "exprs/table_function/vexplode_bitmap.h"

#include <glog/logging.h>

#include <memory>

#include <ostream>

#include "common/status.h"

#include "core/block/block.h"

#include "core/block/column_with_type_and_name.h"

#include "core/column/column.h"

#include "core/column/column_nullable.h"

#include "core/string_ref.h"

#include "core/value/bitmap_value.h"

#include "exprs/table_function/table_function.h"

#include "exprs/vexpr.h"

#include "exprs/vexpr_context.h"

namespace doris {

VExplodeBitmapTableFunction::VExplodeBitmapTableFunction() {

    _fn_name = "vexplode_bitmap";

}

Status VExplodeBitmapTableFunction::process_init(Block* block, RuntimeState* state) {

    CHECK(_expr_context->root()->children().size() == 1)

            << "VExplodeNumbersTableFunction must be have 1 children but have "

            << _expr_context->root()->children().size();

    RETURN_IF_ERROR(_expr_context->root()->children()[0]->execute_column(

            _expr_context.get(), block, nullptr, block->rows(), _value_column));

    return Status::OK();

}

void VExplodeBitmapTableFunction::reset() {

    _eos = false;

    _cur_offset = 0;

    if (!current_empty()) {

        _cur_iter = std::make_unique<BitmapValueIterator>(*_cur_bitmap);

    }

}

void VExplodeBitmapTableFunction::forward(int step) {

    if (!current_empty()) {

        for (int i = 0; i < step; i++) {

            ++(*_cur_iter);

        }

    }

    TableFunction::forward(step);

}

void VExplodeBitmapTableFunction::get_same_many_values(MutableColumnPtr& column, int length) {

    if (current_empty()) {

        column->insert_many_defaults(length);

    } else {

        if (_is_nullable) {

            assert_cast<ColumnInt64*>(

                    assert_cast<ColumnNullable*>(column.get())->get_nested_column_ptr().get())

                    ->insert_many_vals(**_cur_iter, length);

            assert_cast<ColumnUInt8*>(

                    assert_cast<ColumnNullable*>(column.get())->get_null_map_column_ptr().get())

                    ->insert_many_defaults(length);

        } else {

            assert_cast<ColumnInt64*>(column.get())->insert_many_vals(**_cur_iter, length);

        }

    }

}

void VExplodeBitmapTableFunction::process_row(size_t row_idx) {

    TableFunction::process_row(row_idx);

    //FIXME: use ColumnComplex instead

    StringRef value = _value_column->get_data_at(row_idx);

    if (value.data) {

        _cur_bitmap = reinterpret_cast<const BitmapValue*>(value.data);

        _cur_size = _cur_bitmap->cardinality();

        if (!current_empty()) {

            _cur_iter = std::make_unique<BitmapValueIterator>(*_cur_bitmap);

        }

    }

}

void VExplodeBitmapTableFunction::process_close() {

    _value_column = nullptr;

}

int VExplodeBitmapTableFunction::get_value(MutableColumnPtr& column, int max_step) {

    max_step = std::min(max_step, (int)(_cur_size - _cur_offset));

    // should dispose the empty status, forward one step

    if (current_empty()) {

        column->insert_default();

        max_step = 1;

    } else {

        ColumnInt64* target = nullptr;

        if (_is_nullable) {

            target = assert_cast<ColumnInt64*>(

                    assert_cast<ColumnNullable*>(column.get())->get_nested_column_ptr().get());

            assert_cast<ColumnUInt8*>(

                    assert_cast<ColumnNullable*>(column.get())->get_null_map_column_ptr().get())

                    ->insert_many_defaults(max_step);

        } else {

            target = assert_cast<ColumnInt64*>(column.get());

        }

        auto origin_size = target->size();

        target->resize(origin_size + max_step);

        auto* target_data = target->get_data().data();

        for (int i = 0; i < max_step; ++i) {

            target_data[i + origin_size] = **_cur_iter;

            ++(*_cur_iter);

        }

    }

    TableFunction::forward(max_step);

    return max_step;

}

} // namespace doris