# Alert System Setup Guide

## Overview

The Calejo Control Adapter includes a comprehensive multi-channel alert system that can notify operators of safety events, system failures, and operational issues through multiple channels:

- **Email Alerts** - For all safety events
- **SMS Alerts** - For critical events only  
- **Webhook Integration** - For external monitoring systems
- **SCADA Alarms** - For HMI integration (Phase 4)

## Current Implementation Status

### ✅ Fully Implemented
- **Alert routing and management framework**
- **Email sending logic** (requires SMTP configuration)
- **Webhook integration** (requires endpoint configuration)
- **Alert history and statistics**
- **Multi-channel coordination**

### ⚠️ Requires External Configuration
- **SMS Integration** - Needs Twilio account and billing setup
- **Email Integration** - Needs real SMTP server credentials
- **Webhook Integration** - Needs real webhook endpoints
- **SCADA Integration** - Planned for Phase 4

## Configuration Guide

### 1. Email Alert Setup

#### Prerequisites
- SMTP server access (Gmail, Office 365, or company SMTP)
- Valid email account credentials

#### Configuration Steps

1. **Update environment variables** in `config/.env`:
```bash
# Email Configuration
SMTP_SERVER=smtp.gmail.com
SMTP_PORT=587
SMTP_USERNAME=your-email@gmail.com
SMTP_PASSWORD=your-app-password  # Use app password for Gmail
SMTP_USE_TLS=true
```

2. **Update settings** in `config/settings.py`:
```python
alert_email_enabled: bool = True
alert_email_from: str = "calejo-control@your-company.com"
alert_email_recipients: List[str] = ["operator1@company.com", "operator2@company.com"]
```

3. **For Gmail users**:
   - Enable 2-factor authentication
   - Generate an "App Password" for the application
   - Use the app password instead of your regular password

#### Testing Email Configuration
```python
# Test email configuration
from src.monitoring.alerts import AlertManager
from config.settings import Settings

settings = Settings()
alert_manager = AlertManager(settings)

# Send test alert
await alert_manager.send_alert(
    alert_type="TEST_ALERT",
    severity="INFO", 
    message="Test email configuration",
    context={"test": "email"}
)
```

### 2. SMS Alert Setup (Twilio)

#### Prerequisites
- Twilio account (https://www.twilio.com)
- Verified phone numbers for recipients
- Billing information (SMS costs money)

#### Configuration Steps

1. **Get Twilio credentials**:
   - Sign up for Twilio account
   - Get Account SID and Auth Token from dashboard
   - Get your Twilio phone number

2. **Update environment variables** in `config/.env`:
```bash
# Twilio Configuration
TWILIO_ACCOUNT_SID=ACXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
TWILIO_AUTH_TOKEN=your_auth_token
TWILIO_PHONE_NUMBER=+15551234567
```

3. **Update settings** in `config/settings.py`:
```python
alert_sms_enabled: bool = True
alert_sms_recipients: List[str] = ["+393401234567", "+393407654321"]
```

4. **Implement SMS sending** (currently only logs):
   - The current implementation only logs SMS alerts
   - To enable actual SMS sending, uncomment and implement the Twilio integration in `src/monitoring/alerts.py`:

```python
# In _send_sms_alert method, replace the TODO section with:
import twilio
from twilio.rest import Client

client = Client(self.settings.twilio_account_sid, self.settings.twilio_auth_token)

for phone_number in self.settings.alert_sms_recipients:
    message = client.messages.create(
        body=f"[{alert_data['severity']}] {alert_data['message']}",
        from_=self.settings.twilio_phone_number,
        to=phone_number
    )
```

### 3. Webhook Integration

#### Prerequisites
- Webhook endpoint URL
- Authentication token (if required)

#### Configuration Steps

1. **Update environment variables** in `config/.env`:
```bash
# Webhook Configuration
ALERT_WEBHOOK_URL=https://your-monitoring-system.com/webhook
ALERT_WEBHOOK_TOKEN=your_bearer_token
```

2. **Update settings** in `config/settings.py`:
```python
alert_webhook_enabled: bool = True
alert_webhook_url: str = "https://your-monitoring-system.com/webhook"
alert_webhook_token: str = "your_bearer_token"
```

#### Webhook Payload Format
When an alert is triggered, the webhook receives a JSON payload:

```json
{
  "alert_type": "SAFETY_VIOLATION",
  "severity": "ERROR",
  "message": "Speed limit exceeded",
  "context": {
    "requested_speed": 55.0,
    "max_speed": 50.0
  },
  "station_id": "STATION_001",
  "pump_id": "PUMP_001",
  "timestamp": 1234567890.0,
  "app_name": "Calejo Control Adapter",
  "app_version": "2.0.0"
}
```

### 4. SCADA Alarm Integration (Phase 4)

**Status**: Planned for Phase 4 implementation

When implemented, SCADA alarms will:
- Trigger alarms in SCADA HMI systems via OPC UA
- Provide visual and audible alerts in control rooms
- Integrate with existing alarm management systems

## Alert Types and Severity

### Alert Types
- `SAFETY_VIOLATION` - Safety limit exceeded
- `FAILSAFE_ACTIVATED` - Failsafe mode activated
- `EMERGENCY_STOP` - Emergency stop activated
- `SYSTEM_ERROR` - System or communication error
- `WATCHDOG_TIMEOUT` - Database update timeout

### Severity Levels
- `INFO` - Informational messages
- `WARNING` - Non-critical warnings
- `ERROR` - Errors requiring attention
- `CRITICAL` - Critical failures requiring immediate action

## Testing the Alert System

### Unit Tests
Run the comprehensive alert system tests:
```bash
pytest tests/unit/test_alerts.py -v
```

### Manual Testing
```python
# Test all alert channels
from src.monitoring.alerts import AlertManager
from config.settings import Settings

settings = Settings()
alert_manager = AlertManager(settings)

# Test different alert types and severities
test_alerts = [
    ("SAFETY_VIOLATION", "ERROR", "Speed limit exceeded"),
    ("FAILSAFE_ACTIVATED", "CRITICAL", "Failsafe mode activated"),
    ("SYSTEM_ERROR", "WARNING", "Communication timeout"),
]

for alert_type, severity, message in test_alerts:
    result = await alert_manager.send_alert(
        alert_type=alert_type,
        severity=severity,
        message=message,
        context={"test": True}
    )
    print(f"{alert_type}: {result}")
```

## Troubleshooting

### Common Issues

1. **Email not sending**:
   - Check SMTP server credentials
   - Verify TLS/SSL settings
   - Check firewall rules for outbound SMTP

2. **SMS not working**:
   - Verify Twilio account is active and funded
   - Check phone numbers are verified in Twilio
   - Ensure SMS integration is implemented (currently only logs)

3. **Webhook failures**:
   - Verify webhook URL is accessible
   - Check authentication tokens
   - Monitor webhook server logs

4. **No alerts being sent**:
   - Check alert channels are enabled in settings
   - Verify alert system is initialized in main application
   - Check application logs for alert-related errors

### Logging
Alert system activities are logged with the following events:
- `alert_sent` - Alert successfully sent
- `email_alert_failed` - Email delivery failed
- `sms_alert_failed` - SMS delivery failed  
- `webhook_alert_failed` - Webhook delivery failed
- `scada_alert_failed` - SCADA alarm failed

## Security Considerations

- Store SMTP and Twilio credentials securely (environment variables)
- Use app passwords instead of regular passwords for email
- Rotate authentication tokens regularly
- Monitor alert system for abuse or excessive alerts
- Implement rate limiting if needed

## Monitoring and Maintenance

### Alert Statistics
Use the built-in statistics to monitor alert patterns:

```python
alert_manager = AlertManager(settings)
stats = alert_manager.get_alert_stats()
print(f"Total alerts: {stats['total_alerts']}")
print(f"Severity counts: {stats['severity_counts']}")
print(f"Type counts: {stats['type_counts']}")
```

### Alert History
Review recent alerts:
```python
recent_alerts = alert_manager.get_alert_history(limit=50)
for alert in recent_alerts:
    print(f"{alert['timestamp']} - {alert['alert_type']}: {alert['message']}")
```

## Next Steps

1. **Immediate**: Configure email and webhook for basic alerting
2. **Short-term**: Implement Twilio SMS integration if needed
3. **Long-term**: Implement SCADA OPC UA alarm integration in Phase 4

For questions or issues with alert system setup, refer to the application logs or contact the development team.