timer: Refactor ringing state management

Consolidate timer ringing logic and use Timer component as single source
of truth for expired state.

Author: vkareh

src/displayapp/DisplayApp.cpp

@@ -380,7 +380,6 @@ void DisplayApp::Refresh() {
         lv_disp_trig_activity(nullptr);
         auto* timerScreen = static_cast<Screens::Timer*>(currentScreen.get());
         timerScreen->SetTimerRinging();
-        motorController.StartRinging();
         break;
       }
       case Messages::AlarmTriggered:

src/displayapp/screens/Timer.cpp

@@ -63,7 +63,9 @@ Timer::Timer(Controllers::Timer& timerController, Controllers::MotorController&
   // Create the label as a child of the button so it stays centered by default
   txtPlayPause = lv_label_create(btnPlayPause, nullptr);
 
-  if (motorController.IsRinging()) {
+  auto timerStatus = timer.GetTimerState();
+
+  if (timerStatus && timerStatus->expired) {
     SetTimerRinging();
   } else if (timer.IsRunning()) {
     SetTimerRunning();
@@ -76,6 +78,15 @@ Timer::Timer(Controllers::Timer& timerController, Controllers::MotorController&
 
 Timer::~Timer() {
   lv_task_del(taskRefresh);
+
+  // If timer has expired, reset it when leaving the screen
+  auto timerStatus = timer.GetTimerState();
+  if (timerStatus && timerStatus->expired) {
+    motorController.StopRinging();
+    wakeLock.Release();
+    timer.ResetExpiredTime();
+  }
+
   lv_obj_clean(lv_scr_act());
 }
 
@@ -106,20 +117,20 @@ void Timer::UpdateMask() {
 }
 
 void Timer::Refresh() {
-  if (isRinging) {
+  auto timerStatus = timer.GetTimerState();
+
+  if (timerStatus && timerStatus->expired) {
+    // Timer exists and has expired, so we're in ringing mode
     DisplayTime();
-    if (motorController.IsRinging()) {
-      if (displaySeconds.Get().count() > 10) {
-        // Stop buzzing after 10 seconds, but continue the counter
-        motorController.StopRinging();
-        wakeLock.Release();
-      } else {
-        // Keep the screen awake during the first 10 seconds
-        wakeLock.Lock();
-      }
+
+    if (timerStatus->distanceToExpiry.count() > 10000 && motorController.IsRinging()) {
+      // Stop buzzing after 10 seconds, but continue the counter
+      motorController.StopRinging();
+      wakeLock.Release();
     }
+
     // Reset timer after 1 minute
-    if (displaySeconds.Get().count() > 60) {
+    if (timerStatus->distanceToExpiry.count() > 60000) {
       Reset();
     }
   } else if (timer.IsRunning()) {
@@ -153,23 +164,24 @@ void Timer::SetTimerRunning() {
 }
 
 void Timer::SetTimerStopped() {
-  isRinging = false;
   minuteCounter.ShowControls();
   secondCounter.ShowControls();
   lv_label_set_text_static(txtPlayPause, "Start");
   lv_obj_set_style_local_bg_color(btnPlayPause, LV_BTN_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_GREEN);
 }
 
 void Timer::SetTimerRinging() {
-  isRinging = true;
+  motorController.StartRinging();
+  wakeLock.Lock();
   minuteCounter.HideControls();
   secondCounter.HideControls();
   lv_label_set_text_static(txtPlayPause, "Reset");
   lv_obj_set_style_local_bg_color(btnPlayPause, LV_BTN_PART_MAIN, LV_STATE_DEFAULT, LV_COLOR_RED);
 }
 
 void Timer::ToggleRunning() {
-  if (isRinging) {
+  auto timerStatus = timer.GetTimerState();
+  if (timerStatus && timerStatus->expired) {
     motorController.StopRinging();
     Reset();
   } else if (timer.IsRunning()) {

src/displayapp/screens/Timer.h

@@ -48,7 +48,6 @@ namespace Pinetime::Applications {
       Widgets::Counter secondCounter = Widgets::Counter(0, 59, jetbrains_mono_76);
 
       bool buttonPressing = false;
-      bool isRinging = false;
       lv_coord_t maskPosition = 0;
       TickType_t pressTime = 0;
       Utility::DirtyValue<std::chrono::seconds> displaySeconds;