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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ash/app_mode/auto_sleep/weekly_interval_timer.h"
#include <memory>
#include <string>
#include "base/check.h"
#include "base/check_deref.h"
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/location.h"
#include "base/memory/ptr_util.h"
#include "base/task/sequenced_task_runner.h"
#include "base/time/default_clock.h"
#include "base/time/default_tick_clock.h"
#include "base/time/time.h"
#include "base/timer/wall_clock_timer.h"
#include "chromeos/ash/components/policy/weekly_time/weekly_time.h"
#include "chromeos/ash/components/policy/weekly_time/weekly_time_interval.h"
#include "chromeos/ash/components/settings/timezone_settings.h"
#include "third_party/icu/source/i18n/unicode/timezone.h"
namespace ash {
namespace {
base::TimeDelta GetDuration(const base::Time& start,
const policy::WeeklyTime& end) {
policy::WeeklyTime start_weekly_time =
policy::WeeklyTime::GetLocalWeeklyTime(start);
return start_weekly_time.GetDurationTo(end);
}
// Returns true when the provided `time` is contained within the `interval`.
bool TimeFallsInInterval(const base::Time& time,
const policy::WeeklyTimeInterval& interval) {
policy::WeeklyTime current_weekly_time =
policy::WeeklyTime::GetLocalWeeklyTime(time);
return interval.Contains(current_weekly_time);
}
} // namespace
WeeklyIntervalTimer::Factory::Factory()
: Factory(base::DefaultClock::GetInstance(),
base::DefaultTickClock::GetInstance()) {}
WeeklyIntervalTimer::Factory::Factory(const base::Clock* clock,
const base::TickClock* tick_clock)
: clock_(CHECK_DEREF(clock)), tick_clock_(CHECK_DEREF(tick_clock)) {}
WeeklyIntervalTimer::Factory::~Factory() = default;
std::unique_ptr<WeeklyIntervalTimer> WeeklyIntervalTimer::Factory::Create(
const policy::WeeklyTimeInterval& time_interval,
base::RepeatingCallback<void(base::TimeDelta)> on_interval_start_callback) {
// We can't use `make_unique` since the constructor is private.
return base::WrapUnique(
new WeeklyIntervalTimer(time_interval, on_interval_start_callback,
&clock_.get(), &tick_clock_.get()));
}
WeeklyIntervalTimer::WeeklyIntervalTimer(
const policy::WeeklyTimeInterval& time_interval,
base::RepeatingCallback<void(base::TimeDelta)> on_interval_start_callback,
const base::Clock* clock,
const base::TickClock* tick_clock)
: clock_(CHECK_DEREF(clock)),
timer_until_start_of_interval_(
std::make_unique<base::WallClockTimer>(clock, tick_clock)),
time_interval_(time_interval),
on_interval_start_callback_(on_interval_start_callback) {
CHECK(tick_clock);
CHECK(on_interval_start_callback_);
auto& timezone_settings =
CHECK_DEREF(system::TimezoneSettings::GetInstance());
timezone_observer_.Observe(&timezone_settings);
last_known_time_zone_id_ = timezone_settings.GetCurrentTimezoneID();
// Start the timer but do it asynchronous to prevent invoking the callback
// from inside the constructor/while the parent is still setting up.
base::SequencedTaskRunner::GetCurrentDefault()->PostTask(
FROM_HERE,
base::BindOnce(&WeeklyIntervalTimer::CheckIntervalAndStartTimer,
weak_ptr_factory_.GetWeakPtr()));
}
WeeklyIntervalTimer::~WeeklyIntervalTimer() = default;
void WeeklyIntervalTimer::CheckIntervalAndStartTimer() {
if (TimeFallsInInterval(clock_->Now(), time_interval_)) {
InvokeOnStartCallback();
}
ScheduleTimerAtNextIntervalStart();
}
void WeeklyIntervalTimer::TimezoneChanged(const icu::TimeZone& timezone) {
std::u16string updated_timezone_id =
system::TimezoneSettings::GetTimezoneID(timezone);
if (updated_timezone_id == last_known_time_zone_id_) {
return;
}
last_known_time_zone_id_ = updated_timezone_id;
CheckIntervalAndStartTimer();
}
void WeeklyIntervalTimer::InvokeOnStartCallback() {
on_interval_start_callback_.Run(
GetDuration(clock_->Now(), time_interval_.end()));
}
void WeeklyIntervalTimer::ScheduleTimerAtNextIntervalStart() {
auto timer_duration = GetDuration(clock_->Now(), time_interval_.start());
if (timer_duration.is_zero()) {
// This will happen when the current time is exactly
// `time_interval_.start()`, in which case we want to sleep for a full week.
timer_duration = base::Days(7);
}
timer_until_start_of_interval_->Start(
FROM_HERE, clock_->Now() + timer_duration,
base::BindOnce(&WeeklyIntervalTimer::CheckIntervalAndStartTimer,
weak_ptr_factory_.GetWeakPtr()));
}
} // namespace ash
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