// 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_variables_scanner.h"

#include <gen_cpp/Descriptors_types.h>

#include <gen_cpp/FrontendService_types.h>

#include <string.h>

#include <map>

#include <string>

#include <utility>

#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> SchemaVariablesScanner::_s_vars_columns = {

        //   name,       type,          size

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

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

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

        {"CHANGED", TYPE_VARCHAR, sizeof(StringRef), false}};

SchemaVariablesScanner::SchemaVariablesScanner(TVarType::type type)

        : SchemaScanner(_s_vars_columns, TSchemaTableType::SCH_VARIABLES), _type(type) {}

SchemaVariablesScanner::~SchemaVariablesScanner() {}

Status SchemaVariablesScanner::start(RuntimeState* state) {

    TShowVariableRequest var_params;

    // Use db to save type

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

        if (strcmp(_param->common_param->db->c_str(), "GLOBAL") == 0) {

            var_params.__set_varType(TVarType::GLOBAL);

        } else {

            var_params.__set_varType(TVarType::SESSION);

        }

    } else {

        var_params.__set_varType(_type);

    }

    var_params.__set_threadId(_param->common_param->thread_id);

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

        RETURN_IF_ERROR(SchemaHelper::show_variables(

                *(_param->common_param->ip), _param->common_param->port, var_params, &_var_result));

    } else {

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

    }

    return Status::OK();

}

Status SchemaVariablesScanner::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;

    if (_var_result.variables.empty()) {

        return Status::OK();

    }

    return _fill_block_impl(block);

}

Status SchemaVariablesScanner::_fill_block_impl(Block* block) {

    SCOPED_TIMER(_fill_block_timer);

    auto row_num = _var_result.variables.size();

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

    // variables names

    {

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

        int idx = 0;

        for (auto& it : _var_result.variables) {

            strs[idx] = StringRef(it[0].c_str(), it[0].size());

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

            ++idx;

        }

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

    }

    // value

    {

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

        int idx = 0;

        for (auto& it : _var_result.variables) {

            strs[idx] = StringRef(it[1].c_str(), it[1].size());

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

            ++idx;

        }

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

    }

    // default value

    {

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

        int idx = 0;

        for (auto& it : _var_result.variables) {

            strs[idx] = StringRef(it[2].c_str(), it[2].size());

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

            ++idx;

        }

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

    }

    // changed

    {

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

        int idx = 0;

        for (auto& it : _var_result.variables) {

            strs[idx] = StringRef(it[3].c_str(), it[3].size());

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

            ++idx;

        }

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

    }

    return Status::OK();

}

} // namespace doris