# INT-004: Integracion Firebase FCM

---
id: INT-004
type: Integration
status: Pendiente
version: "1.0.0"
created_date: 2026-01-10
updated_date: 2026-01-10
simco_version: "4.0.0"
---

## Metadata

| Campo | Valor |
|-------|-------|
| **ID** | INT-004 |
| **Servicio** | Firebase Cloud Messaging |
| **Proposito** | Notificaciones push |
| **Criticidad** | P1 |
| **Estado** | Pendiente |

---

## 1. Descripcion

Integracion con Firebase Cloud Messaging (FCM) para enviar notificaciones push a los usuarios sobre resultados de inventario, pagos y otros eventos.

---

## 2. Informacion del Servicio

| Campo | Valor |
|-------|-------|
| Proveedor | Google Firebase |
| Documentacion | https://firebase.google.com/docs/cloud-messaging |
| Consola | https://console.firebase.google.com |
| SDK | firebase-admin (node), @react-native-firebase/messaging |

---

## 3. Configuracion

### Variables de Entorno

```env
FIREBASE_PROJECT_ID=miinventario-xxx
FIREBASE_CLIENT_EMAIL=firebase-adminsdk@...
FIREBASE_PRIVATE_KEY="-----BEGIN PRIVATE KEY-----\n..."
```

### Instalacion Backend

```bash
npm install firebase-admin
```

### Instalacion Mobile

```bash
npm install @react-native-firebase/app @react-native-firebase/messaging
```

---

## 4. Tipos de Notificaciones

| Tipo | Evento | Prioridad |
|------|--------|-----------|
| INVENTORY_READY | Inventario procesado | Alta |
| PAYMENT_CONFIRMED | Pago confirmado | Alta |
| PAYMENT_PENDING | Voucher por vencer | Media |
| REFERRAL_ACTIVATED | Referido activado | Media |
| LOW_CREDITS | Creditos bajos | Baja |
| PROMO_ACTIVE | Promocion activa | Baja |

---

## 5. Implementacion Backend

### Inicializacion

```typescript
import * as admin from 'firebase-admin';

@Module({})
export class FirebaseModule {
  static forRoot(): DynamicModule {
    admin.initializeApp({
      credential: admin.credential.cert({
        projectId: process.env.FIREBASE_PROJECT_ID,
        clientEmail: process.env.FIREBASE_CLIENT_EMAIL,
        privateKey: process.env.FIREBASE_PRIVATE_KEY.replace(/\\n/g, '\n'),
      }),
    });

    return {
      module: FirebaseModule,
      global: true,
    };
  }
}
```

### Servicio de Notificaciones

```typescript
@Injectable()
export class NotificationsService {
  async sendToUser(
    userId: string,
    notification: { title: string; body: string; data?: Record<string, string> }
  ) {
    const user = await this.usersService.findOne(userId);
    if (!user.fcmToken) return;

    await admin.messaging().send({
      token: user.fcmToken,
      notification: {
        title: notification.title,
        body: notification.body,
      },
      data: notification.data,
      android: {
        priority: 'high',
        notification: {
          channelId: 'default',
          sound: 'default',
        },
      },
      apns: {
        payload: {
          aps: {
            sound: 'default',
            badge: 1,
          },
        },
      },
    });
  }

  async sendToTopic(
    topic: string,
    notification: { title: string; body: string }
  ) {
    await admin.messaging().sendToTopic(topic, {
      notification,
    });
  }
}
```

---

## 6. Implementacion Mobile

### Configuracion

```typescript
// App.tsx
import messaging from '@react-native-firebase/messaging';

const requestPermission = async () => {
  const authStatus = await messaging().requestPermission();
  const enabled =
    authStatus === messaging.AuthorizationStatus.AUTHORIZED ||
    authStatus === messaging.AuthorizationStatus.PROVISIONAL;

  if (enabled) {
    const token = await messaging().getToken();
    await api.updateFcmToken(token);
  }
};
```

### Handlers

```typescript
// Foreground
messaging().onMessage(async remoteMessage => {
  // Mostrar notificacion in-app
  showLocalNotification(remoteMessage);
});

// Background/Quit
messaging().setBackgroundMessageHandler(async remoteMessage => {
  // Procesar datos
  console.log('Background message:', remoteMessage);
});

// Tap en notificacion
messaging().onNotificationOpenedApp(remoteMessage => {
  // Navegar a pantalla
  navigateToScreen(remoteMessage.data.screen);
});
```

---

## 7. Modelo de Datos

### Tabla: notification_tokens
```sql
CREATE TABLE notification_tokens (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id UUID REFERENCES users(id),
  token VARCHAR(255) NOT NULL,
  platform VARCHAR(20), -- 'ios', 'android'
  device_info JSONB,
  is_active BOOLEAN DEFAULT true,
  created_at TIMESTAMP DEFAULT NOW(),
  updated_at TIMESTAMP DEFAULT NOW()
);
```

### Tabla: notification_logs
```sql
CREATE TABLE notification_logs (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  user_id UUID REFERENCES users(id),
  type VARCHAR(50),
  title VARCHAR(255),
  body TEXT,
  data JSONB,
  sent_at TIMESTAMP DEFAULT NOW(),
  delivered_at TIMESTAMP,
  opened_at TIMESTAMP
);
```

---

## 8. Templates de Notificacion

```typescript
const NOTIFICATION_TEMPLATES = {
  INVENTORY_READY: {
    title: 'Inventario listo',
    body: 'Tu inventario de {{storeName}} esta listo. {{totalItems}} productos detectados.',
  },
  PAYMENT_CONFIRMED: {
    title: 'Pago confirmado',
    body: 'Tu pago de ${{amount}} MXN fue confirmado. +{{credits}} creditos.',
  },
  REFERRAL_ACTIVATED: {
    title: 'Referido activado',
    body: '{{referredName}} activo su cuenta. +{{reward}} creditos.',
  },
};
```

---

## 9. Testing

### Enviar Notificacion de Prueba

```bash
# Usando Firebase CLI
firebase messaging:send \
  --token "device_token" \
  --notification-title "Test" \
  --notification-body "This is a test"
```

### Simulador iOS

FCM no funciona en simulador iOS. Usar dispositivo fisico o Expo Go.

---

## 10. Referencias

- [Firebase FCM Docs](https://firebase.google.com/docs/cloud-messaging)
- [React Native Firebase](https://rnfirebase.io/messaging/usage)
- [MII-005](../01-epicas/MII-005-procesamiento-ia.md) - Notificacion de resultado

---

**Ultima Actualizacion:** 2026-01-10