// 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 "information_schema/schema_charsets_scanner.h"

#include <gen_cpp/Descriptors_types.h>

#include <string.h>

#include "common/status.h"

#include "core/data_type/define_primitive_type.h"

#include "core/string_ref.h"

#include "runtime/runtime_profile.h"

namespace doris {

class Block;

std::vector<SchemaScanner::ColumnDesc> SchemaCharsetsScanner::_s_css_columns = {

        //   name,       type,          size

        {"CHARACTER_SET_NAME", TYPE_VARCHAR, sizeof(StringRef), false},

        {"DEFAULT_COLLATE_NAME", TYPE_VARCHAR, sizeof(StringRef), false},

        {"DESCRIPTION", TYPE_VARCHAR, sizeof(StringRef), false},

        {"MAXLEN", TYPE_BIGINT, sizeof(int64_t), false},

};

SchemaCharsetsScanner::CharsetStruct SchemaCharsetsScanner::_s_charsets[] = {

        {"utf8mb4", "utf8mb4_0900_bin", "UTF-8 Unicode", 4},

        {nullptr, nullptr, nullptr, 0},

};

SchemaCharsetsScanner::SchemaCharsetsScanner()

        : SchemaScanner(_s_css_columns, TSchemaTableType::SCH_CHARSETS) {}

SchemaCharsetsScanner::~SchemaCharsetsScanner() {}

Status SchemaCharsetsScanner::get_next_block_internal(Block* block, bool* eos) {

    if (!_is_init) {

        return Status::InternalError("call this before initial.");

    }

    if (nullptr == block || nullptr == eos) {

        return Status::InternalError("invalid parameter.");

    }

    *eos = true;

    return _fill_block_impl(block);

}

Status SchemaCharsetsScanner::_fill_block_impl(Block* block) {

    SCOPED_TIMER(_fill_block_timer);

    auto row_num = 0;

    while (nullptr != _s_charsets[row_num].charset) {

        ++row_num;

    }

    std::vector<void*> datas(row_num);

    // variables names

    {

        std::vector<StringRef> strs(row_num);

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

            strs[i] = StringRef(_s_charsets[i].charset, strlen(_s_charsets[i].charset));

            datas[i] = strs.data() + i;

        }

        RETURN_IF_ERROR(fill_dest_column_for_range(block, 0, datas));

    }

    // DEFAULT_COLLATE_NAME

    {

        std::vector<StringRef> strs(row_num);

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

            strs[i] = StringRef(_s_charsets[i].default_collation,

                                strlen(_s_charsets[i].default_collation));

            datas[i] = strs.data() + i;

        }

        RETURN_IF_ERROR(fill_dest_column_for_range(block, 1, datas));

    }

    // DESCRIPTION

    {

        std::vector<StringRef> strs(row_num);

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

            strs[i] = StringRef(_s_charsets[i].description, strlen(_s_charsets[i].description));

            datas[i] = strs.data() + i;

        }

        RETURN_IF_ERROR(fill_dest_column_for_range(block, 2, datas));

    }

    // maxlen

    {

        std::vector<int64_t> srcs(row_num);

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

            srcs[i] = _s_charsets[i].maxlen;

            datas[i] = srcs.data() + i;

        }

        RETURN_IF_ERROR(fill_dest_column_for_range(block, 3, datas));

    }

    return Status::OK();

}

} // namespace doris