//  Copyright (c) 2011-present, Facebook, Inc.  All rights reserved.
//  This source code is licensed under both the GPLv2 (found in the
//  COPYING file in the root directory) and Apache 2.0 License
//  (found in the LICENSE.Apache file in the root directory).

#ifdef GFLAGS
#pragma once

#include "rocksdb/listener.h"
#include "util/gflags_compat.h"

DECLARE_int32(compact_files_one_in);

namespace rocksdb {
class DbStressListener : public EventListener {
 public:
  DbStressListener(const std::string& db_name,
                   const std::vector<DbPath>& db_paths,
                   const std::vector<ColumnFamilyDescriptor>& column_families)
      : db_name_(db_name),
        db_paths_(db_paths),
        column_families_(column_families),
        num_pending_file_creations_(0) {}
  virtual ~DbStressListener() { assert(num_pending_file_creations_ == 0); }
#ifndef ROCKSDB_LITE
  virtual void OnFlushCompleted(DB* /*db*/, const FlushJobInfo& info) override {
    assert(IsValidColumnFamilyName(info.cf_name));
    VerifyFilePath(info.file_path);
    // pretending doing some work here
    std::this_thread::sleep_for(
        std::chrono::microseconds(Random::GetTLSInstance()->Uniform(5000)));
  }

  virtual void OnCompactionCompleted(DB* /*db*/,
                                     const CompactionJobInfo& ci) override {
    assert(IsValidColumnFamilyName(ci.cf_name));
    assert(ci.input_files.size() + ci.output_files.size() > 0U);
    for (const auto& file_path : ci.input_files) {
      VerifyFilePath(file_path);
    }
    for (const auto& file_path : ci.output_files) {
      VerifyFilePath(file_path);
    }
    // pretending doing some work here
    std::this_thread::sleep_for(
        std::chrono::microseconds(Random::GetTLSInstance()->Uniform(5000)));
  }

  virtual void OnTableFileCreationStarted(
      const TableFileCreationBriefInfo& /*info*/) override {
    ++num_pending_file_creations_;
  }
  virtual void OnTableFileCreated(const TableFileCreationInfo& info) override {
    assert(info.db_name == db_name_);
    assert(IsValidColumnFamilyName(info.cf_name));
    if (info.file_size) {
      VerifyFilePath(info.file_path);
    }
    assert(info.job_id > 0 || FLAGS_compact_files_one_in > 0);
    if (info.status.ok() && info.file_size > 0) {
      assert(info.table_properties.data_size > 0 ||
             info.table_properties.num_range_deletions > 0);
      assert(info.table_properties.raw_key_size > 0);
      assert(info.table_properties.num_entries > 0);
    }
    --num_pending_file_creations_;
  }

 protected:
  bool IsValidColumnFamilyName(const std::string& cf_name) const {
    if (cf_name == kDefaultColumnFamilyName) {
      return true;
    }
    // The column family names in the stress tests are numbers.
    for (size_t i = 0; i < cf_name.size(); ++i) {
      if (cf_name[i] < '0' || cf_name[i] > '9') {
        return false;
      }
    }
    return true;
  }

  void VerifyFileDir(const std::string& file_dir) {
#ifndef NDEBUG
    if (db_name_ == file_dir) {
      return;
    }
    for (const auto& db_path : db_paths_) {
      if (db_path.path == file_dir) {
        return;
      }
    }
    for (auto& cf : column_families_) {
      for (const auto& cf_path : cf.options.cf_paths) {
        if (cf_path.path == file_dir) {
          return;
        }
      }
    }
    assert(false);
#else
    (void)file_dir;
#endif  // !NDEBUG
  }

  void VerifyFileName(const std::string& file_name) {
#ifndef NDEBUG
    uint64_t file_number;
    FileType file_type;
    bool result = ParseFileName(file_name, &file_number, &file_type);
    assert(result);
    assert(file_type == kTableFile);
#else
    (void)file_name;
#endif  // !NDEBUG
  }

  void VerifyFilePath(const std::string& file_path) {
#ifndef NDEBUG
    size_t pos = file_path.find_last_of("/");
    if (pos == std::string::npos) {
      VerifyFileName(file_path);
    } else {
      if (pos > 0) {
        VerifyFileDir(file_path.substr(0, pos));
      }
      VerifyFileName(file_path.substr(pos));
    }
#else
    (void)file_path;
#endif  // !NDEBUG
  }
#endif  // !ROCKSDB_LITE

 private:
  std::string db_name_;
  std::vector<DbPath> db_paths_;
  std::vector<ColumnFamilyDescriptor> column_families_;
  std::atomic<int> num_pending_file_creations_;
};
}  // namespace rocksdb
#endif  // GFLAGS