// 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 <cstdint>

#include <memory>

#include <string>

#include <vector>

#include "cloud/cloud_tablet.h"

#include "common/status.h"

#include "io/io_common.h"

#include "olap/merger.h"

#include "olap/olap_common.h"

#include "olap/rowid_conversion.h"

#include "olap/rowset/pending_rowset_helper.h"

#include "olap/rowset/rowset_fwd.h"

#include "olap/tablet_fwd.h"

#include "util/runtime_profile.h"

namespace doris {

class MemTrackerLimiter;

class RowsetWriter;

struct RowsetWriterContext;

class StorageEngine;

class CloudStorageEngine;

// This class is a base class for compaction.

// The entrance of this class is compact()

// Any compaction should go through four procedures.

//  1. pick rowsets satisfied to compact

//  2. do compaction

//  3. modify rowsets

//  4. gc output rowset if failed

class Compaction {

public:

    Compaction(BaseTabletSPtr tablet, const std::string& label);

    virtual ~Compaction();

    // Pick input rowsets satisfied to compact

    virtual Status prepare_compact() = 0;

    // Merge input rowsets to output rowset and modify tablet meta

    virtual Status execute_compact() = 0;

    RuntimeProfile* runtime_profile() const { return _profile.get(); }

    virtual ReaderType compaction_type() const = 0;

    virtual std::string_view compaction_name() const = 0;

protected:

    Status merge_input_rowsets();

    // merge inverted index files

    Status do_inverted_index_compaction();

    void construct_index_compaction_columns(RowsetWriterContext& ctx);

    virtual Status construct_output_rowset_writer(RowsetWriterContext& ctx) = 0;

    Status check_correctness();

    int64_t get_avg_segment_rows();

    void init_profile(const std::string& label);

    void _load_segment_to_cache();

    int64_t merge_way_num();

    // the root tracker for this compaction

    std::shared_ptr<MemTrackerLimiter> _mem_tracker;

    BaseTabletSPtr _tablet;

    std::vector<RowsetSharedPtr> _input_rowsets;

    int64_t _input_rowsets_data_size {0};

    int64_t _input_rowsets_index_size {0};

    int64_t _input_rowsets_total_size {0};

    int64_t _input_row_num {0};

    int64_t _input_num_segments {0};

    Merger::Statistics _stats;

    RowsetSharedPtr _output_rowset;

    std::unique_ptr<RowsetWriter> _output_rs_writer;

    enum CompactionState : uint8_t { INITED = 0, SUCCESS = 1 };

    CompactionState _state {CompactionState::INITED};

    bool _is_vertical;

    bool _allow_delete_in_cumu_compaction;

    Version _output_version;

    int64_t _newest_write_timestamp {-1};

    std::unique_ptr<RowIdConversion> _rowid_conversion = nullptr;

    TabletSchemaSPtr _cur_tablet_schema;

    std::unique_ptr<RuntimeProfile> _profile;

    RuntimeProfile::Counter* _input_rowsets_data_size_counter = nullptr;

    RuntimeProfile::Counter* _input_rowsets_counter = nullptr;

    RuntimeProfile::Counter* _input_row_num_counter = nullptr;

    RuntimeProfile::Counter* _input_segments_num_counter = nullptr;

    RuntimeProfile::Counter* _merged_rows_counter = nullptr;

    RuntimeProfile::Counter* _filtered_rows_counter = nullptr;

    RuntimeProfile::Counter* _output_rowset_data_size_counter = nullptr;

    RuntimeProfile::Counter* _output_row_num_counter = nullptr;

    RuntimeProfile::Counter* _output_segments_num_counter = nullptr;

    RuntimeProfile::Counter* _merge_rowsets_latency_timer = nullptr;

};

// `StorageEngine` mixin for `Compaction`

class CompactionMixin : public Compaction {

public:

    CompactionMixin(StorageEngine& engine, TabletSharedPtr tablet, const std::string& label);

    ~CompactionMixin() override;

    Status execute_compact() override;

    int64_t get_compaction_permits();

protected:

    // Convert `_tablet` from `BaseTablet` to `Tablet`

    Tablet* tablet();

    Status construct_output_rowset_writer(RowsetWriterContext& ctx) override;

    virtual Status modify_rowsets();

    StorageEngine& _engine;

private:

    Status execute_compact_impl(int64_t permits);

    void build_basic_info();

    // Return true if do ordered data compaction successfully

    bool handle_ordered_data_compaction();

    Status do_compact_ordered_rowsets();

    bool _check_if_includes_input_rowsets(const RowsetIdUnorderedSet& commit_rowset_ids_set) const;

    PendingRowsetGuard _pending_rs_guard;

};

class CloudCompactionMixin : public Compaction {

public:

    CloudCompactionMixin(CloudStorageEngine& engine, CloudTabletSPtr tablet,

                         const std::string& label);

    ~CloudCompactionMixin() override = default;

    Status execute_compact() override;

protected:

    CloudTablet* cloud_tablet() { return static_cast<CloudTablet*>(_tablet.get()); }

    virtual void garbage_collection();

    CloudStorageEngine& _engine;

    int64_t _expiration = 0;

private:

    Status construct_output_rowset_writer(RowsetWriterContext& ctx) override;

    Status execute_compact_impl(int64_t permits);

    void build_basic_info();

    virtual Status modify_rowsets();

    int64_t get_compaction_permits();

};

} // namespace doris