// 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.
// This file is copied from
// https://github.com/ClickHouse/ClickHouse/blob/master/src/Columns/IColumn.cpp
// and modified by Doris

#include "vec/columns/column.h"

#include "util/simd/bits.h"
#include "vec/columns/column_const.h"
#include "vec/columns/column_nullable.h"
#include "vec/core/sort_block.h"
#include "vec/data_types/data_type.h"

namespace doris::vectorized {

std::string IColumn::dump_structure() const {
    std::stringstream res;
    res << get_name() << "(size = " << size();

    ColumnCallback callback = [&](ColumnPtr& subcolumn) {
        res << ", " << subcolumn->dump_structure();
    };

    // simply read using for_each_subcolumn without modification; const_cast can be used.
    const_cast<IColumn*>(this)->for_each_subcolumn(callback);

    res << ")";
    return res.str();
}

void IColumn::insert_from(const IColumn& src, size_t n) {
    insert(src[n]);
}

void IColumn::sort_column(const ColumnSorter* sorter, EqualFlags& flags,
                          IColumn::Permutation& perms, EqualRange& range, bool last_column) const {
    sorter->sort_column(static_cast<const IColumn&>(*this), flags, perms, range, last_column);
}

void IColumn::compare_internal(size_t rhs_row_id, const IColumn& rhs, int nan_direction_hint,
                               int direction, std::vector<uint8_t>& cmp_res,
                               uint8_t* __restrict filter) const {
    auto sz = this->size();
    DCHECK(cmp_res.size() == sz);
    size_t begin = simd::find_zero(cmp_res, 0);
    while (begin < sz) {
        size_t end = simd::find_one(cmp_res, begin + 1);
        for (size_t row_id = begin; row_id < end; row_id++) {
            int res = this->compare_at(row_id, rhs_row_id, rhs, nan_direction_hint);
            if (res * direction < 0) {
                filter[row_id] = 1;
                cmp_res[row_id] = 1;
            } else if (res * direction > 0) {
                cmp_res[row_id] = 1;
            }
        }
        begin = simd::find_zero(cmp_res, end + 1);
    }
}

void IColumn::serialize_with_nullable(StringRef* keys, size_t num_rows, const bool has_null,
                                      const uint8_t* __restrict null_map) const {
    if (has_null) {
        for (size_t i = 0; i < num_rows; ++i) {
            char* dest = const_cast<char*>(keys[i].data + keys[i].size);
            if (null_map[i]) {
                // is null
                *dest = true;
                keys[i].size += sizeof(UInt8);
                continue;
            }
            // not null
            *dest = false;
            keys[i].size += sizeof(UInt8) + serialize_impl(dest + sizeof(UInt8), i);
        }
    } else {
        for (size_t i = 0; i < num_rows; ++i) {
            char* dest = const_cast<char*>(keys[i].data + keys[i].size);
            *dest = false;
            keys[i].size += sizeof(UInt8) + serialize_impl(dest + sizeof(UInt8), i);
        }
    }
}

void IColumn::deserialize_with_nullable(StringRef* keys, const size_t num_rows,
                                        PaddedPODArray<UInt8>& null_map) {
    for (size_t i = 0; i != num_rows; ++i) {
        UInt8 is_null = *reinterpret_cast<const UInt8*>(keys[i].data);
        null_map.push_back(is_null);
        keys[i].data += sizeof(UInt8);
        keys[i].size -= sizeof(UInt8);
        if (is_null) {
            insert_default();
            continue;
        }
        auto sz = deserialize_impl(keys[i].data);
        keys[i].data += sz;
        keys[i].size -= sz;
    }
}

bool is_column_nullable(const IColumn& column) {
    return is_column<ColumnNullable>(column);
}

bool is_column_const(const IColumn& column) {
    return is_column<ColumnConst>(column);
}

} // namespace doris::vectorized