// 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 <chrono>

#include <memory>

#include <mutex>

//#include "cloud/cloud_cumulative_compaction.h"

//#include "cloud/cloud_base_compaction.h"

//#include "cloud/cloud_full_compaction.h"

#include "cloud/cloud_cumulative_compaction_policy.h"

#include "cloud/cloud_tablet.h"

#include "cloud/cloud_txn_delete_bitmap_cache.h"

#include "cloud/config.h"

#include "io/cache/block_file_cache_factory.h"

#include "storage/compaction/compaction.h"

#include "storage/storage_engine.h"

#include "storage/storage_policy.h"

#include "util/threadpool.h"

namespace doris {

namespace cloud {

class CloudMetaMgr;

}

namespace io {

class FileCacheBlockDownloader;

}

class CloudTabletMgr;

class CloudCumulativeCompaction;

class CloudBaseCompaction;

class CloudFullCompaction;

class TabletHotspot;

class CloudWarmUpManager;

class CloudCompactionStopToken;

class CloudSnapshotMgr;

class CloudIndexChangeCompaction;

class CloudStorageEngine final : public BaseStorageEngine {

public:

    CloudStorageEngine(const EngineOptions& options);

    ~CloudStorageEngine() override;

    Status open() override;

    void stop() override;

    bool stopped() override;

    /* Parameters:

     * - tablet_id: the id of tablet to get

     * - sync_stats: the stats of sync rowset

     * - force_use_only_cached: whether only use cached tablet meta

     * - cache_on_miss: whether cache the tablet meta when missing in cache

     */

    Result<BaseTabletSPtr> get_tablet(int64_t tablet_id, SyncRowsetStats* sync_stats = nullptr,

                                      bool force_use_only_cached = false,

                                      bool cache_on_miss = true) override;

    /*

     * Get the tablet meta for a specific tablet

     * Parameters:

     * - tablet_id: the id of tablet to get meta for

     * - tablet_meta: output TabletMeta shared pointer

     * - force_use_only_cached: whether only use cached tablet meta (return NotFound on miss)

     */

    Status get_tablet_meta(int64_t tablet_id, TabletMetaSharedPtr* tablet_meta,

                           bool force_use_only_cached = false) override;

    Status start_bg_threads(std::shared_ptr<WorkloadGroup> wg_sptr = nullptr) override;

    Status set_cluster_id(int32_t cluster_id) override;

    cloud::CloudMetaMgr& meta_mgr() const { return *_meta_mgr; }

    CloudTabletMgr& tablet_mgr() const { return *_tablet_mgr; }

    CloudSnapshotMgr& cloud_snapshot_mgr() { return *_cloud_snapshot_mgr; }

    CloudTxnDeleteBitmapCache& txn_delete_bitmap_cache() const { return *_txn_delete_bitmap_cache; }

    ThreadPool& calc_tablet_delete_bitmap_task_thread_pool() const {

        return *_calc_tablet_delete_bitmap_task_thread_pool;

    }

    ThreadPool& sync_delete_bitmap_thread_pool() const { return *_sync_delete_bitmap_thread_pool; }

    std::optional<StorageResource> get_storage_resource(const std::string& vault_id) {

        VLOG_DEBUG << "Getting storage resource for vault_id: " << vault_id;

        bool synced = false;

        do {

            if (vault_id.empty() && latest_fs() != nullptr) {

                return StorageResource {latest_fs()};

            }

            if (auto storage_resource = doris::get_storage_resource(vault_id); storage_resource) {

                return storage_resource->first;

            }

            if (synced) {

                break;

            }

            sync_storage_vault();

            synced = true;

        } while (true);

        return std::nullopt;

    }

    io::RemoteFileSystemSPtr latest_fs() const {

        std::lock_guard lock(_latest_fs_mtx);

        return _latest_fs;

    }

    void set_latest_fs(const io::RemoteFileSystemSPtr& fs) {

        std::lock_guard lock(_latest_fs_mtx);

        _latest_fs = fs;

    }

    void get_cumu_compaction(int64_t tablet_id,

                             std::vector<std::shared_ptr<CloudCumulativeCompaction>>& res);

    Status submit_compaction_task(const CloudTabletSPtr& tablet, CompactionType compaction_type);

    Status get_compaction_status_json(std::string* result);

    bool has_base_compaction(int64_t tablet_id) const {

        std::lock_guard lock(_compaction_mtx);

        return _submitted_base_compactions.contains(tablet_id);

    }

    bool has_cumu_compaction(int64_t tablet_id) const {

        std::lock_guard lock(_compaction_mtx);

        return _submitted_cumu_compactions.contains(tablet_id);

    }

    bool has_full_compaction(int64_t tablet_id) const {

        std::lock_guard lock(_compaction_mtx);

        return _submitted_full_compactions.contains(tablet_id);

    }

    std::shared_ptr<CloudCumulativeCompactionPolicy> cumu_compaction_policy(

            std::string_view compaction_policy);

    void sync_storage_vault();

    io::FileCacheBlockDownloader& file_cache_block_downloader() const {

        return *_file_cache_block_downloader;

    }

    CloudWarmUpManager& cloud_warm_up_manager() const { return *_cloud_warm_up_manager; }

    TabletHotspot& tablet_hotspot() const { return *_tablet_hotspot; }

    ThreadPool& sync_load_for_tablets_thread_pool() const {

        return *_sync_load_for_tablets_thread_pool;

    }

    ThreadPool& warmup_cache_async_thread_pool() const { return *_warmup_cache_async_thread_pool; }

    Status register_compaction_stop_token(CloudTabletSPtr tablet, int64_t initiator);

    Status unregister_compaction_stop_token(CloudTabletSPtr tablet, bool clear_ms);

    bool register_index_change_compaction(std::shared_ptr<CloudIndexChangeCompaction> compact,

                                          int64_t tablet_id, bool is_base_compact,

                                          std::string& err_reason);

    void unregister_index_change_compaction(int64_t tablet_id, bool is_base_compact);

    std::chrono::time_point<std::chrono::system_clock> startup_timepoint() const {

        return _startup_timepoint;

    }

#ifdef BE_TEST

    void set_startup_timepoint(const std::chrono::time_point<std::chrono::system_clock>& tp) {

        _startup_timepoint = tp;

    }

#endif

private:

    void _refresh_storage_vault_info_thread_callback();

    void _vacuum_stale_rowsets_thread_callback();

    void _sync_tablets_thread_callback();

    void _compaction_tasks_producer_callback();

    std::vector<CloudTabletSPtr> _generate_cloud_compaction_tasks(CompactionType compaction_type,

                                                                  bool check_score);

    Status _adjust_compaction_thread_num();

    Status _submit_base_compaction_task(const CloudTabletSPtr& tablet);

    Status _submit_cumulative_compaction_task(const CloudTabletSPtr& tablet);

    Status _submit_full_compaction_task(const CloudTabletSPtr& tablet);

    Status _request_tablet_global_compaction_lock(ReaderType compaction_type,

                                                  const CloudTabletSPtr& tablet,

                                                  std::shared_ptr<CloudCompactionMixin> compaction);

    Status _check_all_root_path_cluster_id();

    void _lease_compaction_thread_callback();

    void _check_tablet_delete_bitmap_score_callback();

    std::atomic_bool _stopped {false};

    std::unique_ptr<cloud::CloudMetaMgr> _meta_mgr;

    std::unique_ptr<CloudTabletMgr> _tablet_mgr;

    std::unique_ptr<CloudTxnDeleteBitmapCache> _txn_delete_bitmap_cache;

    std::unique_ptr<ThreadPool> _calc_tablet_delete_bitmap_task_thread_pool;

    std::unique_ptr<ThreadPool> _sync_delete_bitmap_thread_pool;

    // Components for cache warmup

    std::unique_ptr<io::FileCacheBlockDownloader> _file_cache_block_downloader;

    // Depended by `FileCacheBlockDownloader`

    std::unique_ptr<CloudWarmUpManager> _cloud_warm_up_manager;

    std::unique_ptr<TabletHotspot> _tablet_hotspot;

    std::unique_ptr<ThreadPool> _sync_load_for_tablets_thread_pool;

    std::unique_ptr<ThreadPool> _warmup_cache_async_thread_pool;

    std::unique_ptr<CloudSnapshotMgr> _cloud_snapshot_mgr;

    // FileSystem with latest shared storage info, new data will be written to this fs.

    mutable std::mutex _latest_fs_mtx;

    io::RemoteFileSystemSPtr _latest_fs;

    std::vector<std::shared_ptr<Thread>> _bg_threads;

    // ATTN: Compactions in maps depend on `CloudTabletMgr` and `CloudMetaMgr`

    mutable std::mutex _compaction_mtx;

    mutable std::mutex _cumu_compaction_delay_mtx;

    // tablet_id -> submitted base compaction, guarded by `_compaction_mtx`

    std::unordered_map<int64_t, std::shared_ptr<CloudBaseCompaction>> _submitted_base_compactions;

    // tablet_id -> submitted full compaction, guarded by `_compaction_mtx`

    std::unordered_map<int64_t, std::shared_ptr<CloudFullCompaction>> _submitted_full_compactions;

    // Store tablets which are preparing cumu compaction, guarded by `_compaction_mtx`

    std::unordered_set<int64_t> _tablet_preparing_cumu_compaction;

    // tablet_id -> submitted cumu compactions, guarded by `_compaction_mtx`

    std::unordered_map<int64_t, std::vector<std::shared_ptr<CloudCumulativeCompaction>>>

            _submitted_cumu_compactions;

    // tablet_id -> active compaction stop tokens

    std::unordered_map<int64_t, std::shared_ptr<CloudCompactionStopToken>>

            _active_compaction_stop_tokens;

    // tablet_id -> executing cumu compactions, guarded by `_compaction_mtx`

    std::unordered_map<int64_t, std::vector<std::shared_ptr<CloudCumulativeCompaction>>>

            _executing_cumu_compactions;

    // tablet_id -> executing base compactions, guarded by `_compaction_mtx`

    std::unordered_map<int64_t, std::shared_ptr<CloudBaseCompaction>> _executing_base_compactions;

    // tablet_id -> executing full compactions, guarded by `_compaction_mtx`

    std::unordered_map<int64_t, std::shared_ptr<CloudFullCompaction>> _executing_full_compactions;

    // for index change compaction

    std::unordered_map<int64_t, std::shared_ptr<CloudIndexChangeCompaction>>

            _submitted_index_change_cumu_compaction;

    std::unordered_map<int64_t, std::shared_ptr<CloudIndexChangeCompaction>>

            _submitted_index_change_base_compaction;

    using CumuPolices =

            std::unordered_map<std::string_view, std::shared_ptr<CloudCumulativeCompactionPolicy>>;

    CumuPolices _cumulative_compaction_policies;

    std::atomic_bool first_sync_storage_vault {true};

    EngineOptions _options;

    std::mutex _store_lock;

    std::chrono::time_point<std::chrono::system_clock> _startup_timepoint;

};

} // namespace doris