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import { connectWebSocket, subscribe, send, isConnected, onAnyConnect } from '../services/websocket'
import { OperationQueue } from '../crdt/OperationQueue'
import { useItemsStore } from '../stores/items'
import { usePresenceStore } from '../stores/presence'
import { useNotificationsStore } from '../stores/notifications'
import { useListsStore } from '../stores/lists'
import { getDeviceId } from '../services/device'
import { LocalClockService } from '../services/clock'
import { detectConflicts } from '../crdt/ConflictDetector'
import type { Conflict } from '../crdt/ConflictDetector'
import type { CrdtOperation } from '../crdt/types'
import type { Item } from '../types'
export function useListSync() {
const connected = ref(false)
const conflicts = ref<Conflict[]>([])
const unsubscribers: Array<() => void> = []
let currentListId: string | null = null
const sessionOps: CrdtOperation[] = []
async function startSync(listId: string) {
currentListId = listId
const itemsStore = useItemsStore()
const listsStore = useListsStore()
const presenceStore = usePresenceStore()
const notificationsStore = useNotificationsStore()
const myDeviceId = await getDeviceId()
let unsubOps: (() => void) | null = null
let unsubPresence: (() => void) | null = null
function subscribeTopics() {
unsubOps?.()
unsubPresence?.()
unsubOps = subscribe(`/topic/list/${listId}`, (payload) => {
const op = payload as CrdtOperation
if (op.deviceId === myDeviceId) return
LocalClockService.mergeClock(listId, op.vectorClock as Record<string, number>)
sessionOps.push(op)
conflicts.value = detectConflicts(sessionOps)
const listName = listsStore.getById(listId)?.name ?? ''
notificationsStore.add({ listId, listName, message: opToMessage(op) })
Iif ('vibrate' in navigator) navigator.vibrate([100, 50, 100])
applyOp(listId, op, itemsStore)
})
unsubPresence = subscribe(`/topic/list/${listId}/presence`, (payload) => {
const msg = payload as { event: string; deviceId: string; onlineDevices: string[] }
if (msg.event === 'snapshot') presenceStore.setSnapshot(listId, msg.onlineDevices)
else if (msg.event === 'joined') presenceStore.addDevice(listId, msg.deviceIdE)
else if (msg.event === 'left') presenceStore.removeDevice(listId, msg.deviceId)
})
send(`/app/list/${listId}/join`)
}
// Register BEFORE connectWebSocket so this fires even on the very first
// successful connection (covers devices that were offline at mount time).
const unsubConnect = onAnyConnect(async () => {
connected.value = true
subscribeTopics()
// Skip fetchAll if there are pending ops for this list — useSyncQueue flushes
// them first and pulls remote ops via applyOp. Fetching before the flush races
// and overwrites correct optimistic state with stale pre-flush server data.
const pending = await OperationQueue.getAllPending()
Iif (pending.some(op => op.listId === listId)) return
const snapIds = new Set(itemsStore.getItems(listId).map(i => `${i.id}|${i.checked}|${i.name}`))
await itemsStore.fetchAll(listId)
const after = itemsStore.getItems(listId)
const changed = after.length !== snapIds.size
|| after.some(i => !snapIds.has(`${i.id}|${i.checked}|${i.name}`))
Iif (changed) {
const listName = listsStore.getById(listId)?.name ?? ''
notificationsStore.add({ listId, listName, message: 'Liste wurde aktualisiert' })
if ('vibrate' in navigator) navigator.vibrate([100, 50, 100])
}
})
// Try to connect — if offline the STOMP client retries automatically;
// onAnyConnect fires once the connection eventually succeeds.
try {
await connectWebSocket()
connected.value = isConnected()
} catch (e) {
console.warn('[Sync] WebSocket unavailable, running offline', e)
}
function onVisible() {
if (document.visibilityState === 'visible') itemsStore.fetchAll(listId)
}
document.addEventListener('visibilitychange', onVisible)
unsubscribers.push(() => {
unsubOps?.()
unsubPresence?.()
unsubConnect()
document.removeEventListener('visibilitychange', onVisible)
})
}
function stopSync() {
Eif (currentListId) send(`/app/list/${currentListId}/leave`)
unsubscribers.forEach(fn => fn())
unsubscribers.length = 0
currentListId = null
sessionOps.length = 0
conflicts.value = []
}
function dismissConflicts() {
conflicts.value = []
}
onUnmounted(stopSync)
return { connected, conflicts, dismissConflicts, startSync, stopSync }
}
export function opToMessage(op: CrdtOperation): string {
const name = op.payload['name'] as string | undefined
switch (op.operationType) {
case 'ITEM_CREATE': return name ? `"${name}" hinzugefügt` : 'Artikel hinzugefügt'
case 'ITEM_CHECK': return op.payload['checked'] ? 'Artikel abgehakt' : 'Artikel reaktiviert'
case 'ITEM_UPDATE': return name ? `"${name}" bearbeitet` : 'Artikel bearbeitet'
case 'ITEM_DELETE': return 'Artikel gelöscht'
default: return 'Änderung eingetroffen'
}
}
/**
* Apply an incoming CRDT operation from another device to the local Pinia state.
* Exported so useSyncQueue can reuse the same logic during pull-on-reconnect.
*/
export function applyOp(listId: string, op: CrdtOperation, itemsStore: ReturnType<typeof useItemsStore>) {
const payload = op.payload
const items = itemsStore.getItems(listId)
switch (op.operationType) {
case 'ITEM_CREATE': {
const itemId = payload['itemId'] as string
const already = items.find(i => i.id === itemId)
Iif (already) return
const newItem: Item = {
id: itemId,
listId,
name: payload['name'] as string,
checked: false,
position: payload['position'] as number ?? items.length,
categoryId: null,
categoryName: null,
categoryColor: null,
quantity: null,
quantityUnit: null,
price: null,
imageUrl: null,
labels: [],
createdAt: new Date().toISOString(),
updatedAt: new Date().toISOString(),
deletedAt: null,
createdByDeviceId: null,
}
itemsStore.itemsByList[listId] = [...items, newItem]
break
}
case 'ITEM_CHECK': {
const itemId = payload['itemId'] as string
const checked = payload['checked'] as boolean
const idx = items.findIndex(i => i.id === itemId)
if (idx !== -1) items[idx] = { ...items[idx]!, checked }
break
}
case 'ITEM_UPDATE': {
const itemId = payload['itemId'] as string
const name = payload['name'] as string
const idx = items.findIndex(i => i.id === itemId)
if (idx !== -1) items[idx] = { ...items[idx]!, name }
break
}
case 'ITEM_DELETE': {
const itemId = payload['itemId'] as string
if (itemsStore.itemsByList[listId]) {
itemsStore.itemsByList[listId] = items.filter(i => i.id !== itemId)
}
break
}
}
}
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