refactor: move timer function to method

- introduce Timer struct to manage timer state
- update RunPomodoro to use Timer methods for starting, stopping, and pausing
- remove unused pomodoro channels

internal/pomodoro/pomodoro.go

@@ -6,11 +6,8 @@ import (
 	"time"
 )
 
-var pomodoroResetChannel = make(chan bool, 1)
-var pomodoroPauseChannel = make(chan bool, 1)
-var pomodoroResumeChannel = make(chan bool, 1)
-
 var mu sync.Mutex // to synchronize access to shared state
+var timer Timer
 
 // RunPomodoro iterates the Pomodoro work/break sessions.
 func RunPomodoro() {
@@ -22,26 +19,29 @@ func RunPomodoro() {
 	pomodoroConfig := shared.Message.PomodoroSettings
 
 	for session := 1; session <= pomodoroConfig.Sessions; session++ {
+		timer = timer.Init()
+
 		shared.Message.Session = session
+
 		shared.Message.Mode = "Work"
-		if !startTimer(pomodoroConfig.Work) {
+		if !timer.Start(pomodoroConfig.Work) {
 			break
 		}
-		if session == pomodoroConfig.Sessions {
-			shared.Message.Mode = "LongBreak"
-			if !startTimer(pomodoroConfig.LongBreak) {
-				break
-			}
-		} else {
-			shared.Message.Mode = "ShortBreak"
-			if !startTimer(pomodoroConfig.ShortBreak) {
-				break
-			}
-		}
-		shared.Message.Mode = "End"
-	}
 
+		if session > pomodoroConfig.Sessions {
+			shared.Message.Mode = "ShortBreak"
+			if !timer.Start(pomodoroConfig.ShortBreak) {
+				break
+			}
+		} else { // last phase, prepare for finish
+			shared.Message.Mode = "LongBreak"
+			if !timer.Start(pomodoroConfig.LongBreak) {
+				break
+			}
+			shared.Message.Mode = "End"
 			time.Sleep(time.Second)
+		}
+	}
 
 	mu.Lock()
 	shared.Message.Ongoing = false
@@ -53,12 +53,8 @@ func RunPomodoro() {
 	shared.Message.TimeLeft = shared.Message.PomodoroSettings.Work
 }
 
-// Stops and resets the running Pomodoro
 func ResetPomodoro() {
-	shared.Message.Mode = "Idle"
-	shared.Message.Session = 0
-	shared.Message.TimeLeft = shared.Message.PomodoroSettings.Work
-	pomodoroResetChannel <- true
+	timer.Stop()
 }
 
 func PausePomodoro() {
@@ -66,14 +62,14 @@ func PausePomodoro() {
 	shared.Message.Paused = true
 	mu.Unlock()
 
-	pomodoroPauseChannel <- true
+	timer.Pause()
 }
 
 func ResumePomodoro() {
 	mu.Lock()
 	shared.Message.Paused = false
 	mu.Unlock()
-	pomodoroResumeChannel <- true
+	timer.Resume()
 }
 
 func IsPomodoroOngoing() bool {

internal/pomodoro/timer.go

@@ -5,28 +5,49 @@ import (
 	"time"
 )
 
-// runs the countdown and updates shared.Message.TimeLeft every second.
-func startTimer(remainingSeconds int) bool {
-	for remainingSeconds > 0 {
-		select {
-		case <-pomodoroResetChannel:
-			return false
-		case <-pomodoroPauseChannel:
-			// Nothing to set here, just waiting for the signal
-		case <-pomodoroResumeChannel:
-			// Nothing to set here, just waiting for the signal
-		default:
-			// Broadcast the current state to all clients
-			if !IsPomodoroPaused() {
-				shared.Message.TimeLeft = remainingSeconds
-				time.Sleep(time.Second)
-				remainingSeconds--
+type Timer struct {
+	abort  chan bool
+	wait   chan bool
+	resume chan bool
+}
+
+func (t Timer) Init() Timer {
+	return Timer{
+		abort:  make(chan bool, 1),
+		wait:   make(chan bool, 1),
+		resume: make(chan bool, 1),
 	}
+}
+
+func (t *Timer) Start(duration int) bool {
+	for timeLeft := duration; timeLeft > 0; {
+		select {
+		case <-t.abort:
+			return false
+		case <-t.wait:
+			<-t.resume
+		default:
+			shared.Message.TimeLeft = timeLeft
+			time.Sleep(time.Second)
+			timeLeft--
 		}
 	}
 
 	// Final shared.Message when time reaches zero
-	shared.Message.TimeLeft = remainingSeconds
+	shared.Message.TimeLeft = 0
 
 	return true
 }
+
+func (t *Timer) Stop() {
+	t.resume <- true
+	t.abort <- true
+}
+
+func (t *Timer) Pause() {
+	t.wait <- true
+}
+
+func (t *Timer) Resume() {
+	t.resume <- true
+}