// 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_schemata_scanner.h"

#include <gen_cpp/Descriptors_types.h>

#include <gen_cpp/FrontendService_types.h>

#include <string>

#include "core/data_type/define_primitive_type.h"

#include "core/string_ref.h"

#include "information_schema/schema_helper.h"

#include "runtime/runtime_profile.h"

namespace doris {

class RuntimeState;

class Block;

std::vector<SchemaScanner::ColumnDesc> SchemaSchemataScanner::_s_columns = {

        //   name,       type,          size

        {"CATALOG_NAME", TYPE_VARCHAR, sizeof(StringRef), true},

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

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

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

        {"SQL_PATH", TYPE_VARCHAR, sizeof(StringRef), true},

        {"DEFAULT_ENCRYPTION", TYPE_VARCHAR, sizeof(StringRef), true},

};

SchemaSchemataScanner::SchemaSchemataScanner()

        : SchemaScanner(_s_columns, TSchemaTableType::SCH_SCHEMATA) {}

SchemaSchemataScanner::~SchemaSchemataScanner() = default;

Status SchemaSchemataScanner::start(RuntimeState* state) {

    SCOPED_TIMER(_get_db_timer);

    if (!_is_init) {

        return Status::InternalError("used before initial.");

    }

    TGetDbsParams db_params;

    if (nullptr != _param->common_param->wild) {

        db_params.__set_pattern(*(_param->common_param->wild));

    }

    if (nullptr != _param->common_param->catalog) {

        db_params.__set_catalog(*(_param->common_param->catalog));

    }

    if (nullptr != _param->common_param->current_user_ident) {

        db_params.__set_current_user_ident(*(_param->common_param->current_user_ident));

    } else {

        if (nullptr != _param->common_param->user) {

            db_params.__set_user(*(_param->common_param->user));

        }

        if (nullptr != _param->common_param->user_ip) {

            db_params.__set_user_ip(*(_param->common_param->user_ip));

        }

    }

    if (nullptr != _param->common_param->ip && 0 != _param->common_param->port) {

        RETURN_IF_ERROR(SchemaHelper::get_db_names(

                *(_param->common_param->ip), _param->common_param->port, db_params, &_db_result));

    } else {

        return Status::InternalError("IP or port doesn't exists");

    }

    return Status::OK();

}

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

    if (!_is_init) {

        return Status::InternalError("Used before Initialized.");

    }

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

        return Status::InternalError("input pointer is nullptr.");

    }

    *eos = true;

    if (!_db_result.dbs.size()) {

        return Status::OK();

    }

    return _fill_block_impl(block);

}

Status SchemaSchemataScanner::_fill_block_impl(Block* block) {

    SCOPED_TIMER(_fill_block_timer);

    auto dbs_num = _db_result.dbs.size();

    std::vector<void*> null_datas(dbs_num, nullptr);

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

    // catalog

    {

        if (!_db_result.__isset.catalogs) {

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

        } else {

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

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

                strs[i] = StringRef(_db_result.catalogs[i].c_str(), _db_result.catalogs[i].size());

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

            }

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

        }

    }

    // schema

    {

        std::vector<std::string> db_names(dbs_num);

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

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

            db_names[i] = SchemaHelper::extract_db_name(_db_result.dbs[i]);

            strs[i] = StringRef(db_names[i].c_str(), db_names[i].size());

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

        }

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

    }

    // DEFAULT_CHARACTER_SET_NAME

    {

        std::string src = "utf8mb4";

        StringRef str = StringRef(src.c_str(), src.size());

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

            datas[i] = &str;

        }

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

    }

    // DEFAULT_COLLATION_NAME

    {

        std::string src = "utf8mb4_0900_bin";

        StringRef str = StringRef(src.c_str(), src.size());

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

            datas[i] = &str;

        }

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

    }

    // SQL_PATH

    { RETURN_IF_ERROR(fill_dest_column_for_range(block, 4, null_datas)); }

    // DEFAULT_ENCRYPTION

    {

        std::string src = "NO";

        StringRef str = StringRef(src.c_str(), src.size());

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

            datas[i] = &str;

        }

        RETURN_IF_ERROR(fill_dest_column_for_range(block, 5, datas));

    }

    return Status::OK();

}

} // namespace doris