// 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.

#pragma once

#include <gen_cpp/Types_types.h>

#include <stddef.h>

#include <stdint.h>

#include <cstdint>

#include <iosfwd>

#include <memory>

#include <string>

#include <vector>

#include "common/status.h"

#include "core/block/block.h"

#include "exec/sink/writer/async_result_writer.h"

#include "format/transformer/vfile_format_transformer.h"

#include "io/fs/file_writer.h"

#include "runtime/descriptors.h"

#include "runtime/result_block_buffer.h"

#include "runtime/runtime_profile.h"

namespace doris {

class ResultBlockBufferBase;

class RuntimeState;

class GetResultBatchCtx;

using MySQLResultBlockBuffer = ResultBlockBuffer<GetResultBatchCtx>;

class VExprContext;

struct ResultFileOptions;

} // namespace doris

namespace doris {

// write result to file

class VFileResultWriter final : public AsyncResultWriter {

public:

    VFileResultWriter(const ResultFileOptions* file_option,

                      const TStorageBackendType::type storage_type,

                      const TUniqueId fragment_instance_id,

                      const VExprContextSPtrs& _output_vexpr_ctxs,

                      std::shared_ptr<ResultBlockBufferBase> sinker, Block* output_block,

                      bool output_object_data, const RowDescriptor& output_row_descriptor,

                      std::shared_ptr<Dependency> dep, std::shared_ptr<Dependency> fin_dep);

    VFileResultWriter(const TDataSink& t_sink, const VExprContextSPtrs& output_exprs,

                      std::shared_ptr<Dependency> dep, std::shared_ptr<Dependency> fin_dep);

    Status write(RuntimeState* state, Block& block) override;

    Status close(Status exec_status) override;

    Status open(RuntimeState* state, RuntimeProfile* profile) override;

    // file result writer always return statistic result in one row

    int64_t get_written_rows() const override { return 1; }

    void set_header_info(const std::string& header_type, const std::string& header) {

        _header_type = header_type;

        _header = header;

    }

private:

    Status _write_file(const Block& block);

    void _init_profile(RuntimeProfile*);

    Status _create_file_writer(const std::string& file_name);

    Status _create_next_file_writer();

    // get next export file name

    Status _get_next_file_name(std::string* file_name);

    void _get_file_url(std::string* file_url);

    std::string _file_format_to_name();

    // close file writer, and if !done, it will create new writer for next file.

    Status _close_file_writer(bool done);

    // create a new file if current file size exceed limit

    Status _create_new_file_if_exceed_size();

    // send the final statistic result

    Status _send_result();

    // save result into batch rather than send it

    Status _fill_result_block();

    // delete the dir of file_path

    Status _delete_dir();

    double _get_write_speed(int64_t write_bytes, int64_t write_time);

    std::string _compression_type_to_name();

private:

    RuntimeState* _state; // not owned, set when init

    const ResultFileOptions* _file_opts = nullptr;

    TStorageBackendType::type _storage_type;

    TUniqueId _fragment_instance_id;

    // If the result file format is plain text, like CSV, this _file_writer is owned by this FileResultWriter.

    // If the result file format is Parquet, this _file_writer is owned by _parquet_writer.

    std::unique_ptr<doris::io::FileWriter> _file_writer_impl;

    // Used to buffer the export data of plain text

    // TODO(cmy): I simply use a stringstrteam to buffer the data, to avoid calling

    // file writer's write() for every single row.

    // But this cannot solve the problem of a row of data that is too large.

    // For example: bitmap_to_string() may return large volume of data.

    // And the speed is relative low, in my test, is about 6.5MB/s.

    std::stringstream _plain_text_outstream;

    // current written bytes, used for split data

    int64_t _current_written_bytes = 0;

    // the suffix idx of export file name, start at 0

    int _file_idx = 0;

    // total time cost on append batch operation

    RuntimeProfile::Counter* _append_row_batch_timer = nullptr;

    // tuple convert timer, child timer of _append_row_batch_timer

    RuntimeProfile::Counter* _convert_tuple_timer = nullptr;

    // file write timer, child timer of _append_row_batch_timer

    RuntimeProfile::Counter* _file_write_timer = nullptr;

    // time of closing the file writer

    RuntimeProfile::Counter* _writer_close_timer = nullptr;

    // number of written rows

    RuntimeProfile::Counter* _written_rows_counter = nullptr;

    // bytes of written data

    RuntimeProfile::Counter* _written_data_bytes = nullptr;

    // _sinker and _output_batch are not owned by FileResultWriter

    std::shared_ptr<MySQLResultBlockBuffer> _sinker = nullptr;

    Block* _output_block = nullptr;

    // set to true if the final statistic result is sent

    bool _is_result_sent = false;

    RowDescriptor _output_row_descriptor;

    // convert block to parquet/orc/csv fomrat

    std::unique_ptr<VFileFormatTransformer> _vfile_writer;

    std::string_view _header_type;

    std::string_view _header;

};

} // namespace doris