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import {
completeTimer,
createIdleTimer,
deriveTimerSnapshot,
getNextPhase,
pauseTimer,
phaseDurationMs,
restoreTimerFromSession,
resumeTimer,
startTimer
} from '@core/timer/timerState'
import type { AppSettings, CompletionReason, TimerPhase, TimerSession, TimerSnapshot, TimerState } from '@shared/types'
import type { ClockPort, NotificationPort, SoundPort } from '@main/ports/desktop'
import type {
AppEventRepository,
SettingsRepository,
TaskRepository,
TimerRuntimeRepository,
TimerSessionRepository
} from '@main/ports/repositories'
export interface TimerServiceDependencies {
sessions: TimerSessionRepository
settings: SettingsRepository
runtime: TimerRuntimeRepository
events: AppEventRepository
tasks: Pick<TaskRepository, 'list'>
clock: ClockPort
notifier: NotificationPort
sound: SoundPort
}
export interface StartTimerCommand {
phase?: TimerPhase
taskId?: string | null
}
const isTimerPhase = (value: unknown): value is TimerPhase =>
value === 'focus' || value === 'shortBreak' || value === 'longBreak'
const normalizeTimerState = (state: TimerState): TimerState => {
const persistedState = state as TimerState & {
unboundFocusCount?: number
lastFocusTaskId?: string | null
}
return {
...state,
unboundFocusCount: persistedState.unboundFocusCount ?? 0,
lastFocusTaskId: persistedState.lastFocusTaskId ?? null
}
}
export class TimerService {
private readonly emitter = new EventEmitter()
private settingsValue: AppSettings | null = null
private state: TimerState | null = null
constructor(private readonly dependencies: TimerServiceDependencies) {}
async initialize(): Promise<TimerSnapshot> {
const settings = await this.dependencies.settings.get()
this.settingsValue = settings
const now = this.dependencies.clock.now()
const runtimeState = await this.dependencies.runtime.get()
if (runtimeState) {
const normalizedRuntimeState = normalizeTimerState(runtimeState)
const snapshot = deriveTimerSnapshot(normalizedRuntimeState, now)
this.state = {
...normalizedRuntimeState,
status: snapshot.status,
remainingMs: snapshot.remainingMs,
updatedAt: now
}
if (normalizedRuntimeState.status === 'running') {
const action = snapshot.status === 'completed' ? 'needs-confirmation' : 'resume'
await this.dependencies.events.record(
'timer.restore',
{
action,
sessionId: normalizedRuntimeState.sessionId
},
this.dependencies.clock.nowIso()
)
if (snapshot.status === 'completed' && normalizedRuntimeState.sessionId) {
await this.dependencies.sessions.finish({
id: normalizedRuntimeState.sessionId,
endedAt: this.dependencies.clock.nowIso(),
actualDurationMs: normalizedRuntimeState.durationMs,
completed: false,
completionReason: 'needs-confirmation'
})
}
}
await this.persistState()
return this.publish()
}
const activeSession = await this.dependencies.sessions.findActive()
if (!activeSession) {
this.state = createIdleTimer(settings, now)
await this.persistState()
return this.publish()
}
const restore = restoreTimerFromSession({
session: activeSession,
now
})
this.state = {
...restore.state,
focusCount: await this.getRestoredFocusCount(activeSession)
}
await this.dependencies.events.record(
'timer.restore',
{
action: restore.action,
sessionId: activeSession.id
},
this.dependencies.clock.nowIso()
)
if (restore.action === 'needs-confirmation') {
await this.dependencies.sessions.finish({
id: activeSession.id,
endedAt: this.dependencies.clock.nowIso(),
actualDurationMs: activeSession.durationMs,
completed: false,
completionReason: 'needs-confirmation'
})
}
await this.persistState()
return this.publish()
}
async start(command: StartTimerCommand = {}): Promise<TimerSnapshot> {
const settings = await this.requireSettings()
const requestedPhase = command.phase ?? 'focus'
if (!isTimerPhase(requestedPhase)) {
throw new Error(`Invalid timer phase: ${String(requestedPhase)}`)
}
const phase = requestedPhase
const now = this.dependencies.clock.now()
const taskId = phase === 'focus' ? await this.resolveExplicitFocusTaskId(command.taskId) : null
await this.finishCurrentSession('abandoned')
const session = await this.dependencies.sessions.create({
phase,
taskId,
startedAt: this.dependencies.clock.nowIso(),
durationMs: phaseDurationMs(phase, settings)
})
this.state = startTimer(this.requireState(), {
now,
phase,
taskId,
sessionId: session.id,
settings
})
await this.persistState()
return this.publish()
}
async pause(): Promise<TimerSnapshot> {
this.state = pauseTimer(this.requireState(), this.dependencies.clock.now())
await this.persistState()
return this.publish()
}
async bindCurrentTask(taskId: string | null): Promise<TimerSnapshot> {
const state = this.requireState()
if (state.status !== 'running' || state.phase !== 'focus' || !state.sessionId) {
throw new Error('Current timer is not a running focus session')
}
const resolvedTaskId = await this.resolveExplicitFocusTaskId(taskId)
const now = this.dependencies.clock.now()
const nowIso = this.dependencies.clock.nowIso()
await this.dependencies.sessions.updateTask({
id: state.sessionId,
taskId: resolvedTaskId,
updatedAt: nowIso
})
this.state = {
...state,
taskId: resolvedTaskId,
unboundFocusCount: 0,
updatedAt: now
}
await this.persistState()
return this.publish()
}
async clearDeletedTaskBinding(taskId: string): Promise<void> {
const state = this.requireState()
Iif (state.phase !== 'focus' || !state.sessionId) return
Iif (state.status !== 'running' && state.status !== 'paused') return
if (state.taskId !== taskId) return
const now = this.dependencies.clock.now()
const nowIso = this.dependencies.clock.nowIso()
await this.dependencies.sessions.updateTask({
id: state.sessionId,
taskId: null,
updatedAt: nowIso
})
this.state = {
...state,
taskId: null,
unboundFocusCount: 0,
updatedAt: now
}
await this.persistState()
this.publish()
}
async resume(): Promise<TimerSnapshot> {
this.state = resumeTimer(this.requireState(), this.dependencies.clock.now())
await this.persistState()
return this.publish()
}
async skip(): Promise<TimerSnapshot> {
await this.finishCurrentSession('skipped')
this.state = createIdleTimer(await this.requireSettings(), this.dependencies.clock.now())
await this.persistState()
return this.publish()
}
async reset(): Promise<TimerSnapshot> {
await this.finishCurrentSession('abandoned')
this.state = createIdleTimer(await this.requireSettings(), this.dependencies.clock.now())
await this.persistState()
return this.publish()
}
async applySettings(settings: AppSettings): Promise<TimerSnapshot> {
this.settingsValue = settings
const state = this.requireState()
Eif (state.status === 'idle') {
this.state = createIdleTimer(settings, this.dependencies.clock.now())
}
await this.persistState()
return this.publish()
}
async tick(): Promise<TimerSnapshot> {
const state = this.requireState()
const snapshot = deriveTimerSnapshot(state, this.dependencies.clock.now())
Iif (state.status !== 'running' || snapshot.status !== 'completed') {
return this.publish(snapshot)
}
const completedState = completeTimer(state, this.dependencies.clock.now())
this.state = completedState
Eif (state.sessionId) {
await this.dependencies.sessions.finish({
id: state.sessionId,
endedAt: this.dependencies.clock.nowIso(),
actualDurationMs: state.durationMs,
completed: true,
completionReason: 'completed'
})
}
const completedSnapshot = deriveTimerSnapshot(completedState, this.dependencies.clock.now())
await this.playDesktopFeedback(completedSnapshot)
const settings = await this.requireSettings()
const nextPhase = getNextPhase(state.phase, completedState.focusCount, settings)
const shouldAutoStart = state.phase === 'focus' ? settings.autoStartBreaks : settings.autoStartFocus
if (shouldAutoStart) {
return this.start({ phase: nextPhase, taskId: nextPhase === 'focus' ? undefined : null })
}
await this.persistState()
return this.publish(completedSnapshot)
}
getSnapshot(): TimerSnapshot {
return deriveTimerSnapshot(this.requireState(), this.dependencies.clock.now())
}
onSnapshot(listener: (snapshot: TimerSnapshot) => void): () => void {
this.emitter.on('snapshot', listener)
return () => this.emitter.off('snapshot', listener)
}
private async playDesktopFeedback(snapshot: TimerSnapshot): Promise<void> {
const settings = await this.requireSettings()
Eif (settings.notificationsEnabled) {
await this.dependencies.notifier.showTimerFinished(snapshot)
}
Eif (settings.soundEnabled) {
await this.dependencies.sound.playTimerFinished()
}
}
private async resolveExplicitFocusTaskId(taskId: string | null | undefined): Promise<string | null> {
if (taskId === undefined || taskId === null) {
return null
}
const activeTask = (await this.dependencies.tasks.list()).find((task) => task.id === taskId && !task.completedAt)
if (!activeTask) {
throw new Error('Selected task must be active')
}
return taskId
}
private async requireSettings(): Promise<AppSettings> {
Iif (!this.settingsValue) {
this.settingsValue = await this.dependencies.settings.get()
}
return this.settingsValue
}
private async persistState(): Promise<void> {
try {
await this.dependencies.runtime.save(this.requireState())
} catch {
// Keep the in-memory timer running even when runtime persistence is temporarily unavailable.
}
}
private async finishCurrentSession(reason: Exclude<CompletionReason, 'completed' | 'needs-confirmation'>): Promise<void> {
const state = this.requireState()
if (!state.sessionId) return
if (state.status !== 'running' && state.status !== 'paused') return
const snapshot = deriveTimerSnapshot(state, this.dependencies.clock.now())
await this.dependencies.sessions.finish({
id: state.sessionId,
endedAt: this.dependencies.clock.nowIso(),
actualDurationMs: state.durationMs - snapshot.remainingMs,
completed: false,
completionReason: reason
})
}
private async getRestoredFocusCount(activeSession: TimerSession): Promise<number> {
const sessions = await this.dependencies.sessions.list()
const activeStartedAt = new Date(activeSession.startedAt).getTime()
return sessions.filter((session) => {
if (session.id === activeSession.id) return false
if (session.phase !== 'focus' || !session.completed) return false
return new Date(session.startedAt).getTime() < activeStartedAt
}).length
}
private requireState(): TimerState {
Iif (!this.state) {
throw new Error('TimerService has not been initialized')
}
return this.state
}
private publish(snapshot = deriveTimerSnapshot(this.requireState(), this.dependencies.clock.now())): TimerSnapshot {
this.emitter.emit('snapshot', snapshot)
return snapshot
}
}
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