// 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 "cloud/cloud_delta_writer.h"

#include "cloud/cloud_meta_mgr.h"

#include "cloud/cloud_rowset_builder.h"

#include "cloud/cloud_storage_engine.h"

#include "cloud/config.h"

#include "load/delta_writer/delta_writer.h"

#include "load/memtable/memtable_memory_limiter.h"

#include "runtime/exec_env.h"

#include "runtime/thread_context.h"

namespace doris {

bvar::Adder<int64_t> g_cloud_commit_rowset_count("cloud_commit_rowset_count");

bvar::Adder<int64_t> g_cloud_commit_empty_rowset_count("cloud_commit_empty_rowset_count");

CloudDeltaWriter::CloudDeltaWriter(CloudStorageEngine& engine, const WriteRequest& req,

                                   RuntimeProfile* profile, const UniqueId& load_id)

        : BaseDeltaWriter(req, profile, load_id), _engine(engine) {

    _rowset_builder = std::make_unique<CloudRowsetBuilder>(engine, req, profile);

    _resource_ctx = thread_context()->resource_ctx();

}

CloudDeltaWriter::~CloudDeltaWriter() = default;

Status CloudDeltaWriter::batch_init(std::vector<CloudDeltaWriter*> writers) {

    if (writers.empty()) {

        return Status::OK();

    }

    std::vector<std::function<Status()>> tasks;

    tasks.reserve(writers.size());

    for (auto* writer : writers) {

        if (writer->_is_init || writer->_is_cancelled) {

            continue;

        }

        tasks.emplace_back([writer] {

            SCOPED_ATTACH_TASK(writer->resource_context());

            std::lock_guard<bthread::Mutex> lock(writer->_mtx);

            if (writer->_is_init || writer->_is_cancelled) {

                return Status::OK();

            }

            Status st = writer->init(); // included in SCOPED_ATTACH_TASK

            return st;

        });

    }

    return cloud::bthread_fork_join(tasks, 10);

}

Status CloudDeltaWriter::write(const Block* block, const DorisVector<uint32_t>& row_idxs,

                               bool* memtable_flushed) {

    if (memtable_flushed != nullptr) {

        *memtable_flushed = false;

    }

    if (row_idxs.empty()) [[unlikely]] {

        return Status::OK();

    }

    if (_req.enable_table_memtable_backpressure) {

        ExecEnv::GetInstance()->memtable_memory_limiter()->handle_table_memtable_backpressure(

                [this]() {

                    std::lock_guard lock(_mtx);

                    return _is_cancelled;

                },

                table_id());

    }

    std::lock_guard lock(_mtx);

    CHECK(_is_init || _is_cancelled);

    {

        SCOPED_TIMER(_wait_flush_limit_timer);

        while (_memtable_writer->flush_running_count() >=

               config::memtable_flush_running_count_limit) {

            std::this_thread::sleep_for(std::chrono::milliseconds(10));

        }

    }

    return _memtable_writer->write(block, row_idxs, memtable_flushed);

}

Status CloudDeltaWriter::close() {

    std::lock_guard lock(_mtx);

    CHECK(_is_init);

    return _memtable_writer->close();

}

Status CloudDeltaWriter::flush_memtable_async() {

    std::lock_guard lock(_mtx);

    return BaseDeltaWriter::flush_memtable_async();

}

Status CloudDeltaWriter::cancel_with_status(const Status& st) {

    std::lock_guard lock(_mtx);

    return BaseDeltaWriter::cancel_with_status(st);

}

Status CloudDeltaWriter::build_rowset() {

    std::lock_guard lock(_mtx);

    CHECK(_is_init);

    return BaseDeltaWriter::build_rowset();

}

CloudRowsetBuilder* CloudDeltaWriter::rowset_builder() {

    return static_cast<CloudRowsetBuilder*>(_rowset_builder.get());

}

void CloudDeltaWriter::update_tablet_stats() {

    rowset_builder()->update_tablet_stats();

}

const RowsetMetaSharedPtr& CloudDeltaWriter::rowset_meta() {

    return rowset_builder()->rowset_meta();

}

Status CloudDeltaWriter::commit_rowset() {

    g_cloud_commit_rowset_count << 1;

    std::lock_guard<bthread::Mutex> lock(_mtx);

    // Handle empty rowset (no data written)

    if (!_is_init) {

        g_cloud_commit_empty_rowset_count << 1;

        return _commit_empty_rowset();

    }

    // Handle normal rowset with data

    return _engine.meta_mgr().commit_rowset(*rowset_meta(), "",

                                            _rowset_builder->tablet()->table_id());

}

Status CloudDeltaWriter::_commit_empty_rowset() {

    // If skip writing empty rowset metadata is enabled,

    // we do not prepare rowset to meta service.

    if (config::skip_writing_empty_rowset_metadata) {

        rowset_builder()->set_skip_writing_rowset_metadata(true);

    }

    RETURN_IF_ERROR(_rowset_builder->init());

    RETURN_IF_ERROR(_rowset_builder->build_rowset());

    // If skip writing empty rowset metadata is enabled, we do not commit rowset to meta service.

    if (config::skip_writing_empty_rowset_metadata) {

        return Status::OK();

    }

    // write a empty rowset kv to keep version continuous

    return _engine.meta_mgr().commit_rowset(*rowset_meta(), "",

                                            _rowset_builder->tablet()->table_id());

}

Status CloudDeltaWriter::set_txn_related_info() {

    return rowset_builder()->set_txn_related_info();

}

} // namespace doris