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app/src/services/fcm.ts

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+import {
+  registerFcmToken,
+  deleteFcmToken,
+} from '../lib/shared';
+import { PushNotifications } from '@capacitor/push-notifications';
+import { Capacitor } from '@capacitor/core';
+
+export interface FcmPayload {
+  type?: string;
+  market?: string;
+  signalId?: string;
+  signalType?: string;
+  price?: string;
+}
+
+type FcmHandlers = {
+  onForeground?: (title: string, body: string, data?: FcmPayload) => void;
+  onTap?: (data: FcmPayload) => void;
+};
+
+let initialized = false;
+
+export async function initFcmPush(handlers: FcmHandlers = {}): Promise<boolean> {
+  if (!Capacitor.isNativePlatform()) {
+    console.info('[FCM] Web dev — native push skipped');
+    return false;
+  }
+  if (initialized) return true;
+
+  const perm = await PushNotifications.requestPermissions();
+  if (perm.receive !== 'granted') return false;
+
+  await PushNotifications.addListener('registration', async token => {
+    try {
+      await registerFcmToken(token.value);
+      console.info('[FCM] token registered');
+    } catch (e) {
+      console.warn('[FCM] token register failed', e);
+    }
+  });
+
+  await PushNotifications.addListener('registrationError', err => {
+    console.warn('[FCM] registration error', err);
+  });
+
+  await PushNotifications.addListener('pushNotificationReceived', notification => {
+    const title = notification.title ?? 'GoldenChart';
+    const body = notification.body ?? '';
+    handlers.onForeground?.(title, body, notification.data as FcmPayload);
+  });
+
+  await PushNotifications.addListener('pushNotificationActionPerformed', action => {
+    handlers.onTap?.(action.notification.data as FcmPayload);
+  });
+
+  await PushNotifications.register();
+  initialized = true;
+  return true;
+}
+
+export async function unregisterFcmPush(): Promise<void> {
+  if (!Capacitor.isNativePlatform()) return;
+  try {
+    await deleteFcmToken();
+  } catch { /* ignore */ }
+  initialized = false;
+}
+
+export async function checkPushPermission(): Promise<'granted' | 'denied' | 'prompt'> {
+  if (!Capacitor.isNativePlatform()) return 'prompt';
+  const perm = await PushNotifications.checkPermissions();
+  if (perm.receive === 'granted') return 'granted';
+  if (perm.receive === 'denied') return 'denied';
+  return 'prompt';
+}