// 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 "exec/spill/spill_file_writer.h"

#include "agent/be_exec_version_manager.h"

#include "common/config.h"

#include "common/status.h"

#include "exec/spill/spill_file.h"

#include "exec/spill/spill_file_manager.h"

#include "io/fs/local_file_system.h"

#include "io/fs/local_file_writer.h"

#include "runtime/exec_env.h"

#include "runtime/query_context.h"

#include "runtime/runtime_state.h"

#include "runtime/thread_context.h"

namespace doris {

SpillFileWriter::SpillFileWriter(const std::shared_ptr<SpillFile>& spill_file, RuntimeState* state,

                                 RuntimeProfile* profile, SpillDataDir* data_dir,

                                 const std::string& spill_dir)

        : _spill_file_wptr(spill_file),

          _data_dir(data_dir),

          _spill_dir(spill_dir),

          _max_part_size(config::spill_file_part_size_bytes),

          _resource_ctx(state->get_query_ctx()->resource_ctx()) {

    // Common counters

    RuntimeProfile* common_profile = profile->get_child("CommonCounters");

    DCHECK(common_profile != nullptr);

    _memory_used_counter = common_profile->get_counter("MemoryUsage");

    // Register this writer as the active writer for the SpillFile.

    spill_file->_active_writer = this;

    // Custom (spill-specific) counters

    RuntimeProfile* custom_profile = profile->get_child("CustomCounters");

    _write_file_timer = custom_profile->get_counter("SpillWriteFileTime");

    _serialize_timer = custom_profile->get_counter("SpillWriteSerializeBlockTime");

    _write_block_counter = custom_profile->get_counter("SpillWriteBlockCount");

    _write_block_bytes_counter = custom_profile->get_counter("SpillWriteBlockBytes");

    _write_file_total_size = custom_profile->get_counter("SpillWriteFileBytes");

    _write_file_current_size = custom_profile->get_counter("SpillWriteFileCurrentBytes");

    _write_rows_counter = custom_profile->get_counter("SpillWriteRows");

    _total_file_count = custom_profile->get_counter("SpillWriteFileTotalCount");

}

SpillFileWriter::~SpillFileWriter() {

    if (_closed) {

        return;

    }

    Status st = close();

    if (!st.ok()) {

        LOG(WARNING) << "SpillFileWriter::~SpillFileWriter() failed: " << st.to_string()

                     << ", spill_dir=" << _spill_dir;

    }

}

Status SpillFileWriter::_open_next_part() {

    _current_part_path = _spill_dir + "/" + std::to_string(_current_part_index);

    // Create the spill directory lazily on first part

    if (_current_part_index == 0) {

        RETURN_IF_ERROR(io::global_local_filesystem()->create_directory(_spill_dir));

    }

    RETURN_IF_ERROR(io::global_local_filesystem()->create_file(_current_part_path, &_file_writer));

    COUNTER_UPDATE(_total_file_count, 1);

    return Status::OK();

}

Status SpillFileWriter::_close_current_part(const std::shared_ptr<SpillFile>& spill_file) {

    if (!_file_writer) {

        return Status::OK();

    }

    // Write footer: block offsets + max_sub_block_size + block_count

    _part_meta.append((const char*)&_part_max_sub_block_size, sizeof(_part_max_sub_block_size));

    _part_meta.append((const char*)&_part_written_blocks, sizeof(_part_written_blocks));

    {

        SCOPED_TIMER(_write_file_timer);

        RETURN_IF_ERROR(_file_writer->append(_part_meta));

    }

    int64_t meta_size = _part_meta.size();

    _part_written_bytes += meta_size;

    COUNTER_UPDATE(_write_file_total_size, meta_size);

    if (_resource_ctx) {

        _resource_ctx->io_context()->update_spill_write_bytes_to_local_storage(meta_size);

    }

    if (_write_file_current_size) {

        COUNTER_UPDATE(_write_file_current_size, meta_size);

    }

    _data_dir->update_spill_data_usage(meta_size);

    ExecEnv::GetInstance()->spill_file_mgr()->update_spill_write_bytes(meta_size);

    // Incrementally update SpillFile's accounting so gc() can always

    // decrement the correct amount, even if close() is never called.

    if (spill_file) {

        spill_file->update_written_bytes(meta_size);

    }

    RETURN_IF_ERROR(_file_writer->close());

    _file_writer.reset();

    // Advance to next part

    ++_current_part_index;

    if (spill_file) {

        spill_file->increment_part_count();

    }

    _part_written_blocks = 0;

    _part_written_bytes = 0;

    _part_max_sub_block_size = 0;

    _part_meta.clear();

    return Status::OK();

}

Status SpillFileWriter::_rotate_if_needed(const std::shared_ptr<SpillFile>& spill_file) {

    if (_file_writer && _part_written_bytes >= _max_part_size) {

        RETURN_IF_ERROR(_close_current_part(spill_file));

    }

    return Status::OK();

}

Status SpillFileWriter::write_block(RuntimeState* state, const Block& block) {

    DCHECK(!_closed);

    // Lock the SpillFile to ensure it is still alive. If it has already been

    // destroyed (gc'd), we must not write any more data because the disk

    // accounting would be out of sync.

    auto spill_file = _spill_file_wptr.lock();

    if (!spill_file) {

        return Status::Error<INTERNAL_ERROR>(

                "SpillFile has been destroyed, cannot write more data, spill_dir={}", _spill_dir);

    }

    // Lazily open the first part

    if (!_file_writer) {

        RETURN_IF_ERROR(_open_next_part());

    }

    DBUG_EXECUTE_IF("fault_inject::spill_file::spill_block", {

        return Status::Error<INTERNAL_ERROR>("fault_inject spill_file spill_block failed");

    });

    auto rows = block.rows();

    COUNTER_UPDATE(_write_rows_counter, rows);

    COUNTER_UPDATE(_write_block_bytes_counter, block.bytes());

    RETURN_IF_ERROR(_write_internal(block, spill_file));

    // Auto-rotate if current part is full

    return _rotate_if_needed(spill_file);

}

Status SpillFileWriter::close() {

    if (_closed) {

        return Status::OK();

    }

    _closed = true;

    DBUG_EXECUTE_IF("fault_inject::spill_file::spill_eof", {

        return Status::Error<INTERNAL_ERROR>("fault_inject spill_file spill_eof failed");

    });

    auto spill_file = _spill_file_wptr.lock();

    RETURN_IF_ERROR(_close_current_part(spill_file));

    if (spill_file) {

        if (spill_file->_active_writer != this) {

            return Status::Error<INTERNAL_ERROR>(

                    "SpillFileWriter close() called but not registered as active writer, possible "

                    "double close or logic error");

        }

        spill_file->finish_writing();

    }

    return Status::OK();

}

Status SpillFileWriter::_write_internal(const Block& block,

                                        const std::shared_ptr<SpillFile>& spill_file) {

    size_t uncompressed_bytes = 0, compressed_bytes = 0;

    Status status;

    std::string buff;

    int64_t buff_size {0};

    if (block.rows() > 0) {

        {

            PBlock pblock;

            SCOPED_TIMER(_serialize_timer);

            int64_t compressed_time = 0;

            status = block.serialize(

                    BeExecVersionManager::get_newest_version(), &pblock, &uncompressed_bytes,

                    &compressed_bytes, &compressed_time,

                    segment_v2::CompressionTypePB::ZSTD); // ZSTD for better compression ratio

            RETURN_IF_ERROR(status);

            int64_t pblock_mem = pblock.ByteSizeLong();

            COUNTER_UPDATE(_memory_used_counter, pblock_mem);

            Defer defer {[&]() { COUNTER_UPDATE(_memory_used_counter, -pblock_mem); }};

            if (!pblock.SerializeToString(&buff)) {

                return Status::Error<ErrorCode::SERIALIZE_PROTOBUF_ERROR>(

                        "serialize spill data error. [path={}]", _current_part_path);

            }

            buff_size = buff.size();

            COUNTER_UPDATE(_memory_used_counter, buff_size);

            Defer defer2 {[&]() { COUNTER_UPDATE(_memory_used_counter, -buff_size); }};

        }

        if (_data_dir->reach_capacity_limit(buff_size)) {

            return Status::Error<ErrorCode::DISK_REACH_CAPACITY_LIMIT>(

                    "spill data total size exceed limit, path: {}, size limit: {}, spill data "

                    "size: {}",

                    _data_dir->path(),

                    PrettyPrinter::print_bytes(_data_dir->get_spill_data_limit()),

                    PrettyPrinter::print_bytes(_data_dir->get_spill_data_bytes()));

        }

        {

            Defer defer {[&]() {

                if (status.ok()) {

                    _data_dir->update_spill_data_usage(buff_size);

                    ExecEnv::GetInstance()->spill_file_mgr()->update_spill_write_bytes(buff_size);

                    _part_max_sub_block_size =

                            std::max(_part_max_sub_block_size, (size_t)buff_size);

                    _part_meta.append((const char*)&_part_written_bytes, sizeof(size_t));

                    COUNTER_UPDATE(_write_file_total_size, buff_size);

                    if (_resource_ctx) {

                        _resource_ctx->io_context()->update_spill_write_bytes_to_local_storage(

                                buff_size);

                    }

                    if (_write_file_current_size) {

                        COUNTER_UPDATE(_write_file_current_size, buff_size);

                    }

                    COUNTER_UPDATE(_write_block_counter, 1);

                    _part_written_bytes += buff_size;

                    ++_part_written_blocks;

                    // Incrementally update SpillFile so gc() can always

                    // decrement the correct amount from _data_dir.

                    spill_file->update_written_bytes(buff_size);

                }

            }};

            {

                SCOPED_TIMER(_write_file_timer);

                status = _file_writer->append(buff);

                RETURN_IF_ERROR(status);

            }

        }

    }

    return status;

}

} // namespace doris