// 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_tablets_channel.h"

#include <mutex>

#include "cloud/cloud_delta_writer.h"

#include "cloud/cloud_meta_mgr.h"

#include "cloud/cloud_storage_engine.h"

#include "cloud/config.h"

#include "load/channel/tablets_channel.h"

#include "load/delta_writer/delta_writer.h"

namespace doris {

CloudTabletsChannel::CloudTabletsChannel(CloudStorageEngine& engine, const TabletsChannelKey& key,

                                         const UniqueId& load_id, bool is_high_priority,

                                         RuntimeProfile* profile)

        : BaseTabletsChannel(key, load_id, is_high_priority, profile), _engine(engine) {}

CloudTabletsChannel::~CloudTabletsChannel() = default;

std::unique_ptr<BaseDeltaWriter> CloudTabletsChannel::create_delta_writer(

        const WriteRequest& request) {

    return std::make_unique<CloudDeltaWriter>(_engine, request, _profile, _load_id);

}

Status CloudTabletsChannel::add_batch(const PTabletWriterAddBlockRequest& request,

                                      PTabletWriterAddBlockResult* response) {

    // FIXME(plat1ko): Too many duplicate code with `TabletsChannel`

    SCOPED_TIMER(_add_batch_timer);

    int64_t cur_seq = 0;

    if (_add_batch_number_counter != nullptr) {

        _add_batch_number_counter->update(1);

    }

    auto status = _get_current_seq(cur_seq, request);

    if (UNLIKELY(!status.ok())) {

        return status;

    }

    if (request.packet_seq() < cur_seq) {

        LOG(INFO) << "packet has already recept before, expect_seq=" << cur_seq

                  << ", recept_seq=" << request.packet_seq();

        return Status::OK();

    }

    std::unordered_map<int64_t, DorisVector<uint32_t>> tablet_to_rowidxs;

    _build_tablet_to_rowidxs(request, &tablet_to_rowidxs);

    std::unordered_set<int64_t> partition_ids;

    std::vector<CloudDeltaWriter*> writers;

    {

        // add_batch may concurrency with inc_open but not under _lock.

        // so need to protect it with _tablet_writers_lock.

        std::lock_guard<std::mutex> l(_tablet_writers_lock);

        for (auto& [tablet_id, _] : tablet_to_rowidxs) {

            auto tablet_writer_it = _tablet_writers.find(tablet_id);

            if (tablet_writer_it == _tablet_writers.end()) {

                return Status::InternalError("unknown tablet to append data, tablet={}", tablet_id);

            }

            partition_ids.insert(tablet_writer_it->second->partition_id());

            writers.push_back(static_cast<CloudDeltaWriter*>(tablet_writer_it->second.get()));

        }

        if (config::skip_writing_empty_rowset_metadata && !writers.empty()) {

            RETURN_IF_ERROR(CloudDeltaWriter::batch_init(writers));

        } else if (!partition_ids.empty()) {

            RETURN_IF_ERROR(_init_writers_by_partition_ids(partition_ids));

        }

    }

    return _write_block_data(request, cur_seq, tablet_to_rowidxs, response);

}

Status CloudTabletsChannel::_init_writers_by_partition_ids(

        const std::unordered_set<int64_t>& partition_ids) {

    std::vector<CloudDeltaWriter*> writers;

    for (auto&& [tablet_id, base_writer] : _tablet_writers) {

        auto* writer = static_cast<CloudDeltaWriter*>(base_writer.get());

        if (partition_ids.contains(writer->partition_id()) && !writer->is_init()) {

            writers.push_back(writer);

        }

    }

    if (!writers.empty()) {

        RETURN_IF_ERROR(CloudDeltaWriter::batch_init(writers));

    }

    return Status::OK();

}

Status CloudTabletsChannel::close(LoadChannel* parent, const PTabletWriterAddBlockRequest& req,

                                  PTabletWriterAddBlockResult* res, bool* finished) {

    // FIXME(plat1ko): Too many duplicate code with `TabletsChannel`

    std::lock_guard l(_lock);

    if (_state == kFinished) {

        return _close_status;

    }

    auto sender_id = req.sender_id();

    if (_closed_senders.Get(sender_id)) {

        // Double close from one sender, just return OK

        *finished = (_num_remaining_senders == 0);

        return _close_status;

    }

    for (auto pid : req.partition_ids()) {

        _partition_ids.emplace(pid);

    }

    _closed_senders.Set(sender_id, true);

    _num_remaining_senders--;

    *finished = (_num_remaining_senders == 0);

    LOG(INFO) << "close tablets channel: " << _key << ", sender id: " << sender_id

              << ", backend id: " << req.backend_id()

              << " remaining sender: " << _num_remaining_senders;

    if (!*finished) {

        return Status::OK();

    }

    auto* tablet_errors = res->mutable_tablet_errors();

    auto* tablet_vec = res->mutable_tablet_vec();

    _state = kFinished;

    // All senders are closed

    // 1. close all delta writers. under _lock.

    std::vector<CloudDeltaWriter*> writers_to_commit;

    writers_to_commit.reserve(_tablet_writers.size());

    bool success = true;

    for (auto&& [tablet_id, base_writer] : _tablet_writers) {

        auto* writer = static_cast<CloudDeltaWriter*>(base_writer.get());

        // ATTN: the strict mode means strict filtering of column type conversions during import.

        // Sometimes all inputs are filtered, but the partition ID is still set, and the writer is

        // not initialized.

        if (_partition_ids.contains(writer->partition_id())) {

            if (!success) { // Already failed, cancel all remain writers

                static_cast<void>(writer->cancel());

                continue;

            }

            if (writer->is_init()) {

                auto st = writer->close();

                if (!st.ok()) {

                    LOG(WARNING) << "close tablet writer failed, tablet_id=" << tablet_id

                                 << ", txn_id=" << _txn_id << ", err=" << st;

                    PTabletError* tablet_error = tablet_errors->Add();

                    tablet_error->set_tablet_id(tablet_id);

                    tablet_error->set_msg(st.to_string());

                    success = false;

                    _close_status = std::move(st);

                    continue;

                }

            }

            // to make sure tablet writer in `_broken_tablets` won't call `close_wait` method.

            if (_is_broken_tablet(writer->tablet_id())) {

                LOG(WARNING) << "SHOULD NOT HAPPEN, tablet writer is broken but not cancelled"

                             << ", tablet_id=" << tablet_id << ", transaction_id=" << _txn_id;

                continue;

            }

            writers_to_commit.push_back(writer);

        } else {

            auto st = writer->cancel();

            if (!st.ok()) {

                LOG(WARNING) << "cancel tablet writer failed, tablet_id=" << tablet_id

                             << ", txn_id=" << _txn_id;

                // just skip this tablet(writer) and continue to close others

                continue;

            }

        }

    }

    if (!success) {

        return _close_status;

    }

    // 2. wait delta writers

    using namespace std::chrono;

    auto build_start = steady_clock::now();

    for (auto* writer : writers_to_commit) {

        if (!writer->is_init()) {

            continue;

        }

        auto st = writer->build_rowset();

        if (!st.ok()) {

            LOG(WARNING) << "failed to close wait DeltaWriter. tablet_id=" << writer->tablet_id()

                         << ", err=" << st;

            PTabletError* tablet_error = tablet_errors->Add();

            tablet_error->set_tablet_id(writer->tablet_id());

            tablet_error->set_msg(st.to_string());

            _close_status = std::move(st);

            return _close_status;

        }

    }

    int64_t build_latency = duration_cast<milliseconds>(steady_clock::now() - build_start).count();

    // 3. commit rowsets to meta-service

    auto commit_start = steady_clock::now();

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

    tasks.reserve(writers_to_commit.size());

    for (auto* writer : writers_to_commit) {

        tasks.emplace_back([writer] { return writer->commit_rowset(); });

    }

    _close_status = cloud::bthread_fork_join(tasks, 10);

    if (!_close_status.ok()) {

        return _close_status;

    }

    int64_t commit_latency =

            duration_cast<milliseconds>(steady_clock::now() - commit_start).count();

    // 4. calculate delete bitmap for Unique Key MoW tables

    for (auto* writer : writers_to_commit) {

        auto st = writer->submit_calc_delete_bitmap_task();

        if (!st.ok()) {

            LOG(WARNING) << "failed to close wait DeltaWriter. tablet_id=" << writer->tablet_id()

                         << ", err=" << st;

            _add_error_tablet(tablet_errors, writer->tablet_id(), st);

            _close_status = std::move(st);

            return _close_status;

        }

    }

    // 5. wait for delete bitmap calculation complete if necessary

    for (auto* writer : writers_to_commit) {

        auto st = writer->wait_calc_delete_bitmap();

        if (!st.ok()) {

            LOG(WARNING) << "failed to close wait DeltaWriter. tablet_id=" << writer->tablet_id()

                         << ", err=" << st;

            _add_error_tablet(tablet_errors, writer->tablet_id(), st);

            _close_status = std::move(st);

            return _close_status;

        }

    }

    // 6. set txn related info if necessary

    for (auto it = writers_to_commit.begin(); it != writers_to_commit.end();) {

        auto st = (*it)->set_txn_related_info();

        if (!st.ok()) {

            _add_error_tablet(tablet_errors, (*it)->tablet_id(), st);

            _close_status = std::move(st);

            return _close_status;

        }

        it++;

    }

    tablet_vec->Reserve(static_cast<int>(writers_to_commit.size()));

    for (auto* writer : writers_to_commit) {

        PTabletInfo* tablet_info = tablet_vec->Add();

        tablet_info->set_tablet_id(writer->tablet_id());

        // unused required field.

        tablet_info->set_schema_hash(0);

        tablet_info->set_received_rows(writer->total_received_rows());

        tablet_info->set_num_rows_filtered(writer->num_rows_filtered());

        // These stats may be larger than the actual value if the txn is aborted

        writer->update_tablet_stats();

    }

    res->set_build_rowset_latency_ms(build_latency);

    res->set_commit_rowset_latency_ms(commit_latency);

    return Status::OK();

}

} // namespace doris