// 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_plugins_scanner.h"

#include <utility>

#include "core/assert_cast.h"

#include "core/block/block.h"

#include "core/column/column_nullable.h"

#include "core/data_type/data_type_factory.hpp"

#include "core/string_ref.h"

#include "runtime/exec_env.h"

#include "runtime/query_context.h"

#include "runtime/runtime_state.h"

#include "util/client_cache.h"

#include "util/thrift_rpc_helper.h"

namespace doris {

std::vector<SchemaScanner::ColumnDesc> SchemaPluginsScanner::_s_tbls_columns = {

        {"PLUGIN_NAME", TYPE_STRING, sizeof(StringRef), true},

        {"PLUGIN_TYPE", TYPE_STRING, sizeof(StringRef), true},

        {"PLUGIN_VERSION", TYPE_STRING, sizeof(StringRef), true},

        {"SOURCE", TYPE_STRING, sizeof(StringRef), true},

        {"DESCRIPTION", TYPE_STRING, sizeof(StringRef), true},

};

SchemaPluginsScanner::SchemaPluginsScanner()

        : SchemaScanner(_s_tbls_columns, TSchemaTableType::SCH_PLUGINS) {}

Status SchemaPluginsScanner::start(RuntimeState* state) {

    if (!_is_init) {

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

    }

    _block_rows_limit = state->batch_size();

    _rpc_timeout_ms = state->execution_timeout() * 1000;

    // Plugins are per-FE local state: ask the FE this session is connected to.

    auto* query_ctx = state->get_query_ctx();

    if (query_ctx == nullptr) {

        return Status::InternalError("query context is null");

    }

    _fe_addr = query_ctx->current_connect_fe;

    return Status::OK();

}

Status SchemaPluginsScanner::_get_plugins_block_from_fe() {

    TSchemaTableRequestParams schema_table_request_params;

    for (int i = 0; i < _s_tbls_columns.size(); i++) {

        schema_table_request_params.__isset.columns_name = true;

        schema_table_request_params.columns_name.emplace_back(_s_tbls_columns[i].name);

    }

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

    TFetchSchemaTableDataRequest request;

    request.__set_schema_table_name(TSchemaTableName::PLUGINS);

    request.__set_schema_table_params(schema_table_request_params);

    TFetchSchemaTableDataResult result;

    RETURN_IF_ERROR(ThriftRpcHelper::rpc<FrontendServiceClient>(

            _fe_addr.hostname, _fe_addr.port,

            [&request, &result](FrontendServiceConnection& client) {

                client->fetchSchemaTableData(result, request);

            },

            _rpc_timeout_ms));

    Status status(Status::create(result.status));

    if (!status.ok()) {

        LOG(WARNING) << "fetch plugins from FE(" << _fe_addr.hostname

                     << ") failed, errmsg=" << status;

        return status;

    }

    std::vector<TRow> result_data = std::move(result.data_batch);

    if (!result_data.empty()) {

        auto col_size = result_data[0].column_value.size();

        if (col_size != _s_tbls_columns.size()) {

            return Status::InternalError<false>("plugins schema is not match for FE and BE");

        }

    }

    _plugins_block = Block::create_unique();

    for (int i = 0; i < _s_tbls_columns.size(); ++i) {

        auto data_type =

                DataTypeFactory::instance().create_data_type(_s_tbls_columns[i].type, true);

        _plugins_block->insert(ColumnWithTypeAndName(data_type->create_column(), data_type,

                                                     _s_tbls_columns[i].name));

    }

    _plugins_block->reserve(_block_rows_limit);

    for (int i = 0; i < result_data.size(); i++) {

        const TRow& row = result_data[i];

        for (int j = 0; j < _s_tbls_columns.size(); j++) {

            const TCell& cell = row.column_value[j];

            // An unset string cell means SQL NULL (e.g. unknown PLUGIN_VERSION);

            // insert_block_column would materialize it as an empty string.

            if (!cell.__isset.stringVal) {

                MutableColumnPtr mutable_col_ptr =

                        IColumn::mutate(_plugins_block->get_by_position(j).column);

                // All _s_tbls_columns are declared nullable, so the column is

                // always a ColumnNullable wrapping the string column.

                assert_cast<ColumnNullable*>(mutable_col_ptr.get())->insert_data(nullptr, 0);

                _plugins_block->replace_by_position(j, std::move(mutable_col_ptr));

                continue;

            }

            RETURN_IF_ERROR(

                    insert_block_column(cell, j, _plugins_block.get(), _s_tbls_columns[j].type));

        }

    }

    return Status::OK();

}

Status SchemaPluginsScanner::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 (_plugins_block == nullptr) {

        RETURN_IF_ERROR(_get_plugins_block_from_fe());

        _total_rows = static_cast<int>(_plugins_block->rows());

    }

    if (_row_idx == _total_rows) {

        *eos = true;

        return Status::OK();

    }

    int current_batch_rows = std::min(_block_rows_limit, _total_rows - _row_idx);

    ScopedMutableBlock scoped_mblock(block);

    auto& mblock = scoped_mblock.mutable_block();

    RETURN_IF_ERROR(mblock.add_rows(_plugins_block.get(), _row_idx, current_batch_rows));

    _row_idx += current_batch_rows;

    *eos = _row_idx == _total_rows;

    return Status::OK();

}

} // namespace doris