// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_MAIN_THREAD_ATTRIBUTION_GROUP_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_MAIN_THREAD_ATTRIBUTION_GROUP_H_

#include "third_party/blink/public/common/input/web_input_event_attribution.h"
#include "third_party/blink/renderer/platform/wtf/hash_functions.h"
#include "third_party/blink/renderer/platform/wtf/hash_traits.h"

namespace blink {
namespace scheduler {

// A hashable wrapper around a WebInputEventAttribution that can be used to
// group pending events together.
struct AttributionGroup {
  explicit AttributionGroup(WebInputEventAttribution attribution)
      : attribution(attribution) {}

  explicit AttributionGroup(HashTableDeletedValueType)
      : is_deleted_value(true) {}

  AttributionGroup() = default;

  bool IsHashTableDeletedValue() const { return is_deleted_value; }

  bool operator==(const AttributionGroup& other) const {
    return attribution == other.attribution &&
           is_deleted_value == other.is_deleted_value;
  }

  WebInputEventAttribution attribution = {};
  bool is_deleted_value = false;
};

}  // namespace scheduler

template <>
struct HashTraits<scheduler::AttributionGroup>
    : SimpleClassHashTraits<scheduler::AttributionGroup> {
  static unsigned GetHash(const scheduler::AttributionGroup& group) {
    return static_cast<unsigned>(group.attribution.GetHash());
  }
  static const bool kEmptyValueIsZero = false;
};

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCHEDULER_MAIN_THREAD_ATTRIBUTION_GROUP_H_