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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_UI_TABS_TAB_CREATION_METRICS_CONTROLLER_H_
#define CHROME_BROWSER_UI_TABS_TAB_CREATION_METRICS_CONTROLLER_H_
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/time/time.h"
namespace tab_groups {
class TabGroupId;
}
namespace tabs {
class TabInterface;
// Enumerates different types of grouping transition a tab undergoes during a
// specific observation window. Each value includes the initial tab grouping
// state and the ending tab grouping state.
// LINT.IfChange(TabGroupingTransitionType)
enum TabGroupingTransitionType {
// Used when the transition type is not set.
kUninitialized = 0,
// The tab was not in a group at the start and remains ungrouped.
kUngroupedToUngrouped = 1,
// The tab was not in a group at the start and joined a group.
kUngroupedToGrouped = 2,
// The tab was in a group at the start and became ungrouped.
kGroupedToUngrouped = 3,
// The tab was in a group at the start and remains in the same group.
kGroupedToInPreviousGroup = 4,
// The tab was in a group at the start but joined a different group.
kGroupedToOutsidePreviousGroup = 5,
kMaxValue = kGroupedToOutsidePreviousGroup,
};
// LINT.ThenChange(/tools/metrics/histograms/metadata/tab/enums.xml:TabGroupingTransitionType)
// Per-tab metrics helper that records how a tab's grouping state changes
// shortly after creation.
//
// When constructed, the controller gets the last active tab group if any, and
// schedules a one-time delayed task on |task_runner_| to log how the tab's
// grouping state changed between creation and the end of the delay (10
// seconds).
class TabCreationMetricsController {
public:
static constexpr base::TimeDelta kDelay = base::Seconds(10);
// Global test hook for setting task runner for the scheduled task. Must be
// called before TabCreationMetricsController is created. To reset to the
// current default task runner, pass nullptr to SetTaskRunnerForTesting().
static void SetTaskRunnerForTesting(
const scoped_refptr<base::SequencedTaskRunner>& task_runner);
explicit TabCreationMetricsController(TabInterface* tab);
~TabCreationMetricsController();
TabCreationMetricsController(const TabCreationMetricsController&) = delete;
TabCreationMetricsController& operator=(const TabCreationMetricsController&) =
delete;
private:
// Posts a delayed task to record the tab's grouping state changes 10 seconds
// after creation. The histogram will include the tab's initial grouping state
// and and the ending grouping state.
void ScheduleRecordTabGroupingTransition();
void RecordTabGroupingTransition(
std::optional<tab_groups::TabGroupId> last_active_group_id);
raw_ptr<TabInterface> tab_;
scoped_refptr<base::SequencedTaskRunner> task_runner_;
base::WeakPtrFactory<TabCreationMetricsController> weak_factory_{this};
};
} // namespace tabs
#endif // CHROME_BROWSER_UI_TABS_TAB_CREATION_METRICS_CONTROLLER_H_
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