update

app/src/services/offlineSync.ts

@@ -47,7 +47,6 @@ class OfflineSyncService {
   constructor() {
     this.initializeNetworkListener();
     this.loadSyncQueue();
-    this.startPeriodicSync();
   }
 
   private initializeNetworkListener() {
@@ -61,6 +60,9 @@ class OfflineSyncService {
       const stored = await AsyncStorage.getItem(SYNC_QUEUE_KEY);
       if (stored) {
         this.syncQueue = JSON.parse(stored);
+        if (this.syncQueue.length > 0) {
+          this.startPeriodicSync();
+        }
       }
     } catch (error) {
       console.error('Failed to load sync queue:', error);
@@ -76,6 +78,10 @@ class OfflineSyncService {
   }
 
   private startPeriodicSync() {
+    if (this.syncInterval) {
+      return;
+    }
+
     // Try to sync every 30 seconds when online
     this.syncInterval = setInterval(() => {
       if (this.isOnline && this.syncQueue.length > 0) {
@@ -99,6 +105,7 @@ class OfflineSyncService {
     };
 
     this.syncQueue.push(syncItem);
+    this.startPeriodicSync();
     this.saveSyncQueue();
 
     // Try to sync immediately if online
@@ -135,6 +142,10 @@ class OfflineSyncService {
 
     this.syncQueue = remainingItems;
     this.saveSyncQueue();
+
+    if (this.syncQueue.length === 0) {
+      this.stopPeriodicSync();
+    }
   }
 
   private async processSyncItem(item: SyncItem, api: any) {