/**
 * Copyright (c) 2021 OceanBase
 * OceanBase CE is licensed under Mulan PubL v2.
 * You can use this software according to the terms and conditions of the Mulan PubL v2.
 * You may obtain a copy of Mulan PubL v2 at:
 *          http://license.coscl.org.cn/MulanPubL-2.0
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PubL v2 for more details.
 */

#ifndef OCEANBASE_SHARE_OB_ZONE_MERGE_INFO_
#define OCEANBASE_SHARE_OB_ZONE_MERGE_INFO_

#include "lib/list/ob_dlink_node.h"
#include "lib/atomic/ob_atomic.h"
#include "lib/list/ob_dlist.h"
#include "lib/string/ob_fixed_length_string.h"
#include "lib/utility/ob_print_utils.h"
#include "common/ob_region.h"
#include "common/ob_zone.h"
#include "common/ob_region.h"
#include "common/ob_zone_status.h"
#include "common/ob_zone_type.h"
#include "share/ob_replica_info.h"

namespace oceanbase
{
namespace share
{
struct ObMergeInfoItem : public common::ObDLinkBase<ObMergeInfoItem>		
{		
public:		
  //TODO:scn
  typedef common::ObDList<ObMergeInfoItem> ItemList;		
  ObMergeInfoItem(ItemList &list, const char *name, int64_t value, const bool need_update);		
  ObMergeInfoItem(const ObMergeInfoItem &item);	
  
  ObMergeInfoItem &operator = (const ObMergeInfoItem &item);
  // Differ from operator=, won't assign <need_update_>
  void assign_value(const ObMergeInfoItem &item);
  bool is_valid() const { return NULL != name_ && value_ >= 0; }
  void set_val(const int64_t value, const bool need_update)
  { value_ = value < 0 ? 0: value; need_update_ = need_update; }
  TO_STRING_KV(K_(name), K_(value), K_(need_update));	
  operator int64_t() const { return value_; }		
public:		
  const char *name_;		
  uint64_t value_;		
  bool need_update_; // used to mark the table field need to be updated or not
};

struct ObZoneMergeInfo
{
public:
  enum MergeStatus
  {
    MERGE_STATUS_IDLE,
    MERGE_STATUS_MERGING,
    MERGE_STATUS_VERIFYING,
    MERGE_STATUS_MAX
  };
  enum ObMergeErrorType
  {
    NONE_ERROR,
    CHECKSUM_ERROR,
    ERROR_TYPE_MAX
  };
  ObZoneMergeInfo();
  ObZoneMergeInfo &operator =(const ObZoneMergeInfo &other) = delete;
  int assign(const ObZoneMergeInfo &other);
  // differ from assign, only exclude 'need_update_' copy
  int assign_value(const ObZoneMergeInfo &other);
  void reset();
  bool is_valid() const;

  static const char *get_merge_status_str(const MergeStatus status);
  static MergeStatus get_merge_status(const char* merge_status_str);

  bool is_merged(const int64_t broadcast_version) const;
  bool is_in_merge() const;
  bool need_merge(const int64_t broadcast_version) const;

  TO_STRING_KV(K_(tenant_id), K_(zone), K_(is_merging), K_(broadcast_scn), K_(last_merged_scn),
    K_(last_merged_time), K_(all_merged_scn), K_(merge_start_time), K_(merge_status), K_(frozen_scn), 
    K_(start_merge_fail_times));

public:
  uint64_t tenant_id_;
  common::ObZone zone_;
  ObMergeInfoItem::ItemList list_;

  ObMergeInfoItem is_merging_;
  ObMergeInfoItem broadcast_scn_;
  ObMergeInfoItem last_merged_scn_;
  ObMergeInfoItem last_merged_time_;
  ObMergeInfoItem all_merged_scn_;
  ObMergeInfoItem merge_start_time_;
  ObMergeInfoItem merge_status_;
  ObMergeInfoItem frozen_scn_;
  int64_t start_merge_fail_times_;
};

struct ObGlobalMergeInfo
{
public:
  ObGlobalMergeInfo();
  void reset();
  bool is_last_merge_complete() const;
  bool is_in_merge() const;
  bool is_valid() const;
  bool is_merge_error() const;
  ObGlobalMergeInfo &operator = (const ObGlobalMergeInfo &other) = delete;
  int assign(const ObGlobalMergeInfo &other);
  // differ from assign, only exclude 'need_update_' copy
  int assign_value(const ObGlobalMergeInfo &other);

  TO_STRING_KV(K_(tenant_id), K_(cluster), K_(frozen_scn),
    K_(global_broadcast_scn), K_(last_merged_scn), K_(is_merge_error), 
    K_(merge_status), K_(error_type), K_(suspend_merging), K_(merge_start_time),
    K_(last_merged_time));

public:
  uint64_t tenant_id_;
  ObMergeInfoItem::ItemList list_;

  ObMergeInfoItem cluster_;
  ObMergeInfoItem frozen_scn_;
  ObMergeInfoItem global_broadcast_scn_;
  ObMergeInfoItem last_merged_scn_;
  ObMergeInfoItem is_merge_error_;
  ObMergeInfoItem merge_status_;
  ObMergeInfoItem error_type_;
  ObMergeInfoItem suspend_merging_;
  ObMergeInfoItem merge_start_time_;
  ObMergeInfoItem last_merged_time_;
};

struct ObMergeProgress
{
public:
  uint64_t tenant_id_;
  common::ObZone zone_;

  int64_t unmerged_tablet_cnt_;
  int64_t unmerged_data_size_;

  int64_t merged_tablet_cnt_;
  int64_t merged_data_size_;

  int64_t smallest_snapshot_version_;

  int64_t get_merged_tablet_percentage() const;
  int64_t get_merged_data_percentage() const;

  bool operator <(const ObMergeProgress &o) const { return zone_ < o.zone_; }
  bool operator <(const common::ObZone &zone) const { return zone_ < zone; }

  ObMergeProgress() 
    : tenant_id_(0), zone_(), unmerged_tablet_cnt_(0), unmerged_data_size_(0),
      merged_tablet_cnt_(0), merged_data_size_(0), smallest_snapshot_version_(0)
  {}
  ~ObMergeProgress() {}

  TO_STRING_KV(K_(tenant_id), K_(zone), K_(unmerged_tablet_cnt), K_(unmerged_data_size));
};

typedef common::ObArray<ObMergeProgress> ObAllZoneMergeProgress;
typedef common::ObSEArray<common::ObZone, DEFAULT_ZONE_COUNT> ObZoneArray;
typedef common::ObSEArray<share::ObZoneMergeInfo, DEFAULT_ZONE_COUNT> ObZoneMergeInfoArray;

} // end namespace share
} // end namespace oceanbase

#endif  //OCEANBASE_SHARE_OB_ZONE_MERGE_INFO_