// 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_views_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> SchemaViewsScanner::_s_tbls_columns = {

        //   name,       type,          size,     is_null

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

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

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

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

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

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

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

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

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

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

};

SchemaViewsScanner::SchemaViewsScanner()

        : SchemaScanner(_s_tbls_columns, TSchemaTableType::SCH_VIEWS), _db_index(0) {}

SchemaViewsScanner::~SchemaViewsScanner() {}

Status SchemaViewsScanner::start(RuntimeState* state) {

    if (!_is_init) {

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

    }

    SCOPED_TIMER(_get_db_timer);

    TGetDbsParams db_params;

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

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

    }

    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 SchemaViewsScanner::_get_new_table() {

    SCOPED_TIMER(_get_table_timer);

    TGetTablesParams table_params;

    table_params.__set_db(_db_result.dbs[_db_index++]);

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

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

    }

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

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

    } else {

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

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

        }

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

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

        }

    }

    table_params.__set_type("VIEW");

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

        RETURN_IF_ERROR(SchemaHelper::list_table_status(*(_param->common_param->ip),

                                                        _param->common_param->port, table_params,

                                                        &_table_result));

    } else {

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

    }

    return Status::OK();

}

Status SchemaViewsScanner::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.");

    }

    if (_db_index < _db_result.dbs.size()) {

        RETURN_IF_ERROR(_get_new_table());

    } else {

        *eos = true;

        return Status::OK();

    }

    *eos = false;

    return _fill_block_impl(block);

}

Status SchemaViewsScanner::_fill_block_impl(Block* block) {

    SCOPED_TIMER(_fill_block_timer);

    auto tables_num = _table_result.tables.size();

    if (tables_num == 0) {

        return Status::OK();

    }

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

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

    // catalog

    {

        std::string catalog_name = _db_result.catalogs[_db_index - 1];

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

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

            datas[i] = &str;

        }

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

    }

    // schema

    {

        std::string db_name = SchemaHelper::extract_db_name(_db_result.dbs[_db_index - 1]);

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

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

            datas[i] = &str;

        }

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

    }

    // name

    {

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

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

            const TTableStatus& tbl_status = _table_result.tables[i];

            const std::string* src = &tbl_status.name;

            strs[i] = StringRef(src->c_str(), src->size());

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

        }

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

    }

    // definition

    {

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

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

            const TTableStatus& tbl_status = _table_result.tables[i];

            const std::string* src = &tbl_status.ddl_sql;

            strs[i] = StringRef(src->c_str(), src->length());

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

        }

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

    }

    // check_option

    {

        const std::string check_option = "NONE";

        StringRef str = StringRef(check_option.c_str(), check_option.length());

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

            datas[i] = &str;

        }

        RETURN_IF_ERROR(fill_dest_column_for_range(block, 4, datas));

    }

    // is_updatable

    {

        // This is from views in mysql

        const std::string is_updatable = "NO";

        StringRef str = StringRef(is_updatable.c_str(), is_updatable.length());

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

            datas[i] = &str;

        }

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

    }

    // definer

    {

        // This is from views in mysql

        const std::string definer = "root@%";

        StringRef str = StringRef(definer.c_str(), definer.length());

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

            datas[i] = &str;

        }

        RETURN_IF_ERROR(fill_dest_column_for_range(block, 6, datas));

    }

    // security_type

    {

        // This is from views in mysql

        const std::string security_type = "DEFINER";

        StringRef str = StringRef(security_type.c_str(), security_type.length());

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

            datas[i] = &str;

        }

        RETURN_IF_ERROR(fill_dest_column_for_range(block, 7, datas));

    }

    // character_set_client

    {

        // This is from views in mysql

        const std::string encoding = "utf8";

        StringRef str = StringRef(encoding.c_str(), encoding.length());

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

            datas[i] = &str;

        }

        RETURN_IF_ERROR(fill_dest_column_for_range(block, 8, datas));

    }

    // collation_connection

    { RETURN_IF_ERROR(fill_dest_column_for_range(block, 9, null_datas)); }

    return Status::OK();

}

} // namespace doris