// 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 <memory>

#include "olap/base_tablet.h"

#include "olap/partial_update_info.h"

namespace doris {

class CloudStorageEngine;

struct SyncRowsetStats {

    int64_t get_remote_rowsets_num {0};

    int64_t get_remote_rowsets_rpc_ns {0};

    int64_t get_local_delete_bitmap_rowsets_num {0};

    int64_t get_remote_delete_bitmap_rowsets_num {0};

    int64_t get_remote_delete_bitmap_key_count {0};

    int64_t get_remote_delete_bitmap_bytes {0};

    int64_t get_remote_delete_bitmap_rpc_ns {0};

    int64_t get_remote_tablet_meta_rpc_ns {0};

    int64_t tablet_meta_cache_hit {0};

    int64_t tablet_meta_cache_miss {0};

};

struct RecycledRowsets {

    RowsetId rowset_id;

    int64_t num_segments;

    std::vector<std::string> index_file_names;

};

class CloudTablet final : public BaseTablet {

public:

    CloudTablet(CloudStorageEngine& engine, TabletMetaSharedPtr tablet_meta);

    ~CloudTablet() override;

    bool exceed_version_limit(int32_t limit) override;

    Result<std::unique_ptr<RowsetWriter>> create_rowset_writer(RowsetWriterContext& context,

                                                               bool vertical) override;

    Status capture_rs_readers(const Version& spec_version, std::vector<RowSetSplits>* rs_splits,

                              bool skip_missing_version) override;

    size_t tablet_footprint() override {

        return _approximate_data_size.load(std::memory_order_relaxed);

    }

    std::string tablet_path() const override;

    // clang-format off

    int64_t fetch_add_approximate_num_rowsets (int64_t x) { return _approximate_num_rowsets .fetch_add(x, std::memory_order_relaxed); }

    int64_t fetch_add_approximate_num_segments(int64_t x) { return _approximate_num_segments.fetch_add(x, std::memory_order_relaxed); }

    int64_t fetch_add_approximate_num_rows    (int64_t x) { return _approximate_num_rows    .fetch_add(x, std::memory_order_relaxed); }

    int64_t fetch_add_approximate_data_size   (int64_t x) { return _approximate_data_size   .fetch_add(x, std::memory_order_relaxed); }

    int64_t fetch_add_approximate_cumu_num_rowsets (int64_t x) { return _approximate_cumu_num_rowsets.fetch_add(x, std::memory_order_relaxed); }

    int64_t fetch_add_approximate_cumu_num_deltas   (int64_t x) { return _approximate_cumu_num_deltas.fetch_add(x, std::memory_order_relaxed); }

    // clang-format on

    // meta lock must be held when calling this function

    void reset_approximate_stats(int64_t num_rowsets, int64_t num_segments, int64_t num_rows,

                                 int64_t data_size);

    // return a json string to show the compaction status of this tablet

    void get_compaction_status(std::string* json_result);

    // Synchronize the rowsets from meta service.

    // If tablet state is not `TABLET_RUNNING`, sync tablet meta and all visible rowsets.

    // If `query_version` > 0 and local max_version of the tablet >= `query_version`, do nothing.

    // If 'need_download_data_async' is true, it means that we need to download the new version

    // rowsets datum async.

    Status sync_rowsets(int64_t query_version = -1, bool warmup_delta_data = false,

                        SyncRowsetStats* stats = nullptr);

    // Synchronize the tablet meta from meta service.

    Status sync_meta();

    // If `version_overlap` is true, function will delete rowsets with overlapped version in this tablet.

    // If 'warmup_delta_data' is true, download the new version rowset data in background.

    // MUST hold EXCLUSIVE `_meta_lock`.

    // If 'need_download_data_async' is true, it means that we need to download the new version

    // rowsets datum async.

    void add_rowsets(std::vector<RowsetSharedPtr> to_add, bool version_overlap,

                     std::unique_lock<std::shared_mutex>& meta_lock,

                     bool warmup_delta_data = false);

    // MUST hold EXCLUSIVE `_meta_lock`.

    void delete_rowsets(const std::vector<RowsetSharedPtr>& to_delete,

                        std::unique_lock<std::shared_mutex>& meta_lock);

    // When the tablet is dropped, we need to recycle cached data:

    // 1. The data in file cache

    // 2. The memory in tablet cache

    void clear_cache() override;

    // Return number of deleted stale rowsets

    uint64_t delete_expired_stale_rowsets();

    bool has_stale_rowsets() const { return !_stale_rs_version_map.empty(); }

    int64_t get_cloud_base_compaction_score() const;

    int64_t get_cloud_cumu_compaction_score() const;

    int64_t max_version_unlocked() const override { return _max_version; }

    int64_t base_compaction_cnt() const { return _base_compaction_cnt; }

    int64_t cumulative_compaction_cnt() const { return _cumulative_compaction_cnt; }

    int64_t full_compaction_cnt() const { return _full_compaction_cnt; }

    int64_t cumulative_layer_point() const {

        return _cumulative_point.load(std::memory_order_relaxed);

    }

    void set_base_compaction_cnt(int64_t cnt) { _base_compaction_cnt = cnt; }

    void set_cumulative_compaction_cnt(int64_t cnt) { _cumulative_compaction_cnt = cnt; }

    void set_full_compaction_cnt(int64_t cnt) { _full_compaction_cnt = cnt; }

    void set_cumulative_layer_point(int64_t new_point);

    int64_t last_cumu_compaction_failure_time() { return _last_cumu_compaction_failure_millis; }

    void set_last_cumu_compaction_failure_time(int64_t millis) {

        _last_cumu_compaction_failure_millis = millis;

    }

    int64_t last_base_compaction_failure_time() { return _last_base_compaction_failure_millis; }

    void set_last_base_compaction_failure_time(int64_t millis) {

        _last_base_compaction_failure_millis = millis;

    }

    int64_t last_full_compaction_failure_time() { return _last_full_compaction_failure_millis; }

    void set_last_full_compaction_failure_time(int64_t millis) {

        _last_full_compaction_failure_millis = millis;

    }

    int64_t last_cumu_compaction_success_time() { return _last_cumu_compaction_success_millis; }

    void set_last_cumu_compaction_success_time(int64_t millis) {

        _last_cumu_compaction_success_millis = millis;

    }

    int64_t last_base_compaction_success_time() { return _last_base_compaction_success_millis; }

    void set_last_base_compaction_success_time(int64_t millis) {

        _last_base_compaction_success_millis = millis;

    }

    int64_t last_full_compaction_success_time() { return _last_full_compaction_success_millis; }

    void set_last_full_compaction_success_time(int64_t millis) {

        _last_full_compaction_success_millis = millis;

    }

    int64_t last_cumu_compaction_schedule_time() { return _last_cumu_compaction_schedule_millis; }

    void set_last_cumu_compaction_schedule_time(int64_t millis) {

        _last_cumu_compaction_schedule_millis = millis;

    }

    int64_t last_base_compaction_schedule_time() { return _last_base_compaction_schedule_millis; }

    void set_last_base_compaction_schedule_time(int64_t millis) {

        _last_base_compaction_schedule_millis = millis;

    }

    int64_t last_full_compaction_schedule_time() { return _last_full_compaction_schedule_millis; }

    void set_last_full_compaction_schedule_time(int64_t millis) {

        _last_full_compaction_schedule_millis = millis;

    }

    void set_last_cumu_compaction_status(std::string status) {

        _last_cumu_compaction_status = std::move(status);

    }

    std::string get_last_cumu_compaction_status() { return _last_cumu_compaction_status; }

    void set_last_base_compaction_status(std::string status) {

        _last_base_compaction_status = std::move(status);

    }

    std::string get_last_base_compaction_status() { return _last_base_compaction_status; }

    void set_last_full_compaction_status(std::string status) {

        _last_full_compaction_status = std::move(status);

    }

    std::string get_last_full_compaction_status() { return _last_full_compaction_status; }

    int64_t alter_version() const { return _alter_version; }

    void set_alter_version(int64_t alter_version) { _alter_version = alter_version; }

    std::vector<RowsetSharedPtr> pick_candidate_rowsets_to_base_compaction();

    inline Version max_version() const {

        std::shared_lock rdlock(_meta_lock);

        return _tablet_meta->max_version();

    }

    int64_t base_size() const { return _base_size; }

    std::vector<RowsetSharedPtr> pick_candidate_rowsets_to_full_compaction();

    std::mutex& get_base_compaction_lock() { return _base_compaction_lock; }

    std::mutex& get_cumulative_compaction_lock() { return _cumulative_compaction_lock; }

    Result<std::unique_ptr<RowsetWriter>> create_transient_rowset_writer(

            const Rowset& rowset, std::shared_ptr<PartialUpdateInfo> partial_update_info,

            int64_t txn_expiration = 0) override;

    CalcDeleteBitmapExecutor* calc_delete_bitmap_executor() override;

    Status save_delete_bitmap(const TabletTxnInfo* txn_info, int64_t txn_id,

                              DeleteBitmapPtr delete_bitmap, RowsetWriter* rowset_writer,

                              const RowsetIdUnorderedSet& cur_rowset_ids,

                              int64_t next_visible_version = -1) override;

    Status save_delete_bitmap_to_ms(int64_t cur_version, int64_t txn_id,

                                    DeleteBitmapPtr delete_bitmap, int64_t next_visible_version);

    Status calc_delete_bitmap_for_compaction(const std::vector<RowsetSharedPtr>& input_rowsets,

                                             const RowsetSharedPtr& output_rowset,

                                             const RowIdConversion& rowid_conversion,

                                             ReaderType compaction_type, int64_t merged_rows,

                                             int64_t initiator,

                                             DeleteBitmapPtr& output_rowset_delete_bitmap,

                                             bool allow_delete_in_cumu_compaction);

    // Find the missed versions until the spec_version.

    //

    // for example:

    //     [0-4][5-5][8-8][9-9][14-14]

    // if spec_version = 12, it will return [6-7],[10-12]

    Versions calc_missed_versions(int64_t spec_version, Versions existing_versions) const override;

    std::mutex& get_rowset_update_lock() { return _rowset_update_lock; }

    bthread::Mutex& get_sync_meta_lock() { return _sync_meta_lock; }

    const auto& rowset_map() const { return _rs_version_map; }

    // Merge all rowset schemas within a CloudTablet

    Status merge_rowsets_schema();

    int64_t last_sync_time_s = 0;

    int64_t last_load_time_ms = 0;

    int64_t last_base_compaction_success_time_ms = 0;

    int64_t last_cumu_compaction_success_time_ms = 0;

    int64_t last_cumu_no_suitable_version_ms = 0;

    int64_t last_access_time_ms = 0;

    std::atomic<int64_t> local_read_time_us = 0;

    std::atomic<int64_t> remote_read_time_us = 0;

    std::atomic<int64_t> exec_compaction_time_us = 0;

    // Return merged extended schema

    TabletSchemaSPtr merged_tablet_schema() const override;

    void build_tablet_report_info(TTabletInfo* tablet_info);

    // check that if the delete bitmap in delete bitmap cache has the same cardinality with the expected_delete_bitmap's

    Status check_delete_bitmap_cache(int64_t txn_id, DeleteBitmap* expected_delete_bitmap) override;

    bool need_remove_unused_rowsets();

    void add_unused_rowsets(const std::vector<RowsetSharedPtr>& rowsets);

    void remove_unused_rowsets();

    static std::vector<RecycledRowsets> recycle_cached_data(

            const std::vector<RowsetSharedPtr>& rowsets);

private:

    // FIXME(plat1ko): No need to record base size if rowsets are ordered by version

    void update_base_size(const Rowset& rs);

    Status sync_if_not_running(SyncRowsetStats* stats = nullptr);

    CloudStorageEngine& _engine;

    // this mutex MUST ONLY be used when sync meta

    bthread::Mutex _sync_meta_lock;

    // ATTENTION: lock order should be: _sync_meta_lock -> _meta_lock

    std::atomic<int64_t> _cumulative_point {-1};

    std::atomic<int64_t> _approximate_num_rowsets {-1};

    std::atomic<int64_t> _approximate_num_segments {-1};

    std::atomic<int64_t> _approximate_num_rows {-1};

    std::atomic<int64_t> _approximate_data_size {-1};

    std::atomic<int64_t> _approximate_cumu_num_rowsets {-1};

    // Number of sorted arrays (e.g. for rowset with N segments, if rowset is overlapping, delta is N, otherwise 1) after cumu point

    std::atomic<int64_t> _approximate_cumu_num_deltas {-1};

    // timestamp of last cumu compaction failure

    std::atomic<int64_t> _last_cumu_compaction_failure_millis;

    // timestamp of last base compaction failure

    std::atomic<int64_t> _last_base_compaction_failure_millis;

    // timestamp of last full compaction failure

    std::atomic<int64_t> _last_full_compaction_failure_millis;

    // timestamp of last cumu compaction success

    std::atomic<int64_t> _last_cumu_compaction_success_millis;

    // timestamp of last base compaction success

    std::atomic<int64_t> _last_base_compaction_success_millis;

    // timestamp of last full compaction success

    std::atomic<int64_t> _last_full_compaction_success_millis;

    // timestamp of last cumu compaction schedule time

    std::atomic<int64_t> _last_cumu_compaction_schedule_millis;

    // timestamp of last base compaction schedule time

    std::atomic<int64_t> _last_base_compaction_schedule_millis;

    // timestamp of last full compaction schedule time

    std::atomic<int64_t> _last_full_compaction_schedule_millis;

    std::string _last_cumu_compaction_status;

    std::string _last_base_compaction_status;

    std::string _last_full_compaction_status;

    int64_t _base_compaction_cnt = 0;

    int64_t _cumulative_compaction_cnt = 0;

    int64_t _full_compaction_cnt = 0;

    int64_t _max_version = -1;

    int64_t _base_size = 0;

    int64_t _alter_version = -1;

    std::mutex _base_compaction_lock;

    std::mutex _cumulative_compaction_lock;

    // To avoid multiple calc delete bitmap tasks on same (txn_id, tablet_id) with different

    // signatures being executed concurrently, we use _rowset_update_lock to serialize them

    mutable std::mutex _rowset_update_lock;

    // Schema will be merged from all rowsets when sync_rowsets

    TabletSchemaSPtr _merged_tablet_schema;

    // unused_rowsets, [start_version, end_version]

    std::mutex _gc_mutex;

    std::unordered_map<RowsetId, RowsetSharedPtr> _unused_rowsets;

};

using CloudTabletSPtr = std::shared_ptr<CloudTablet>;

} // namespace doris