// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef COMPONENTS_INVALIDATION_PUBLIC_TOPIC_INVALIDATION_MAP_H_
#define COMPONENTS_INVALIDATION_PUBLIC_TOPIC_INVALIDATION_MAP_H_

#include <map>
#include <memory>
#include <vector>

#include "components/invalidation/public/invalidation.h"
#include "components/invalidation/public/invalidation_export.h"
#include "components/invalidation/public/invalidation_util.h"
#include "components/invalidation/public/single_object_invalidation_set.h"

namespace syncer {
class ObjectIdInvalidationMap;

// A set of notifications with some helper methods to organize them by object ID
// and version number.
class INVALIDATION_EXPORT TopicInvalidationMap {
 public:
  TopicInvalidationMap();
  TopicInvalidationMap(const TopicInvalidationMap& other);
  ~TopicInvalidationMap();

  // Returns set of Topics for which at least one invalidation is present.
  TopicSet GetTopics() const;

  // Returns true if this map contains no invalidations.
  bool Empty() const;

  // Returns true if both maps contain the same set of invalidations.
  bool operator==(const TopicInvalidationMap& other) const;

  // Inserts a new invalidation into this map.
  void Insert(const Invalidation& invalidation);

  // Returns a new map containing the subset of invaliations from this map
  // whose IDs were in the specified |ids| set.
  TopicInvalidationMap GetSubsetWithTopics(const Topics& ids) const;

  // Returns the subset of invalidations with IDs matching |id|.
  const SingleObjectInvalidationSet& ForTopic(Topic id) const;

  // Returns the contents of this map in a single vector.
  void GetAllInvalidations(std::vector<syncer::Invalidation>* out) const;

  // Call Acknowledge() on all contained Invalidations.
  void AcknowledgeAll() const;

  // Serialize this map to a value.
  std::unique_ptr<base::ListValue> ToValue() const;

  // Deserialize the value into a map and use it to re-initialize this object.
  bool ResetFromValue(const base::ListValue& value);

  // Prints the contentes of this map as a human-readable string.
  std::string ToString() const;

 private:
  typedef std::map<Topic, SingleObjectInvalidationSet> TopicToListMap;

  TopicInvalidationMap(const TopicToListMap& map);

  TopicToListMap map_;
};

TopicInvalidationMap ConvertObjectIdInvalidationMapToTopicInvalidationMap(
    ObjectIdInvalidationMap object_ids_map);

}  // namespace syncer

#endif  // COMPONENTS_INVALIDATION_PUBLIC_TOPIC_INVALIDATION_MAP_H_