# Automatic Lighthouse Scanning System

This document describes the automatic Lighthouse scanning system that has been integrated into your website monitoring application.

## Overview

The automatic scanning system provides:
- **Scheduled Scans**: Periodic scans based on user-configured schedules
- **Change Detection**: Automatic scans triggered when website content changes
- **Subscription Limits**: Respects user subscription tiers and rate limits
- **Webhook Support**: External triggers for website changes
- **Comprehensive UI**: User-friendly interface for managing scan schedules

## System Architecture

### Core Components

1. **LighthouseScanner** (`src/services/lighthouseScanner.ts`)
   - Handles core scanning logic
   - Manages change detection
   - Enforces subscription limits
   - Simulates Lighthouse scans

2. **ScanScheduler** (`src/services/scanScheduler.ts`)
   - Manages scheduled scans
   - Processes change detection
   - Orchestrates scan execution

3. **Cron Handler** (`src/app/api/cron/scan/route.ts`)
   - Main entry point for automated scans
   - Supports different scan modes
   - Provides scan statistics

4. **Webhook Handler** (`src/app/api/webhooks/website-change/route.ts`)
   - Receives external change notifications
   - Triggers high-priority scans
   - Validates subscription limits

5. **ScanScheduleManager** (`src/components/dashboard/ScanScheduleManager.tsx`)
   - User interface for managing scan schedules
   - Displays usage statistics
   - Allows manual scan triggers

## Features

### Scheduled Scanning
- **Frequency Options**: Hourly, daily, weekly, monthly
- **Device Types**: Desktop and/or mobile
- **Categories**: Performance, accessibility, SEO, best practices
- **Subscription Tiers**: Different limits per tier

### Change Detection
- **Content Hashing**: Detects changes in website content
- **Automatic Triggers**: High-priority scans when changes detected
- **Subscription Validation**: Only available for certain tiers

### Subscription Management
- **Daily Limits**: Maximum scans per day
- **Monthly Limits**: Maximum scans per month
- **Feature Access**: Different capabilities per tier
- **Usage Tracking**: Real-time usage monitoring

### Webhook Integration
- **External Triggers**: Receive change notifications from external systems
- **Validation**: Verify subscription and limits
- **Audit Logging**: Track all webhook activities

## Database Schema

The system uses several new tables:

### Core Tables
- `scans`: Main scan records
- `scan_results`: Detailed scan results
- `pages`: Website pages with content hashes
- `metric_values`: Individual metric values
- `resource_analysis`: Resource usage analysis

### Configuration Tables
- `metric_definitions`: Available metrics
- `alert_configurations`: Alert settings
- `subscription_limits`: Tier-based limits

### Audit Tables
- `audit_logs`: System activity logging
- `crawl_queue`: Crawl job queue
- `crawl_sessions`: Crawl session tracking

## API Endpoints

### Cron Endpoints
```
POST /api/cron/scan?mode=all          # Full scan (scheduled + change detection)
POST /api/cron/scan?mode=scheduled    # Scheduled scans only
POST /api/cron/scan?mode=change_detection  # Change detection only
```

### Webhook Endpoints
```
POST /api/webhooks/website-change     # External change notifications
```

### Manual Endpoints
```
POST /api/cron/scan                   # Manual scan trigger (authenticated)
```

## Configuration

### Environment Variables
```env
NEXT_PUBLIC_SUPABASE_URL=your_supabase_url
NEXT_PUBLIC_SUPABASE_ANON_KEY=your_anon_key
SUPABASE_SERVICE_ROLE_KEY=your_service_role_key
```

### Subscription Tiers
- **Free**: 10 scans/day, 100 scans/month
- **Pro**: 50 scans/day, 500 scans/month
- **Enterprise**: 200 scans/day, 2000 scans/month

## Usage

### Setting Up Automated Scans

1. **Deploy the Application**
   ```bash
   # Deploy to Vercel (recommended)
   vercel --prod
   
   # Or deploy to your preferred platform
   ```

2. **Set Up Cron Jobs**
   ```bash
   # Run the setup script
   ./scripts/setup-cron.sh
   
   # Or follow the manual setup guide
   # docs/cron-setup-guide.md
   ```

3. **Configure Database**
   ```sql
   -- Run the setup script
   \i setup-database.sql
   ```

### Managing Scan Schedules

1. **Access the Dashboard**
   - Navigate to `/dashboard/websites`
   - Click on a website to view details
   - Find the "Scan Schedule Management" section

2. **Configure Settings**
   - Toggle automatic scanning on/off
   - Set scan frequency (hourly, daily, weekly, monthly)
   - Choose device types (desktop, mobile)
   - Select scan categories

3. **Monitor Usage**
   - View daily and monthly scan usage
   - Check against subscription limits
   - Trigger manual scans when needed

### Webhook Integration

1. **Set Up External Monitoring**
   - Configure your external system to detect website changes
   - Send POST requests to `/api/webhooks/website-change`

2. **Webhook Payload**
   ```json
   {
     "websiteId": "website-uuid",
     "url": "https://example.com/changed-page",
     "changeType": "content_update",
     "contentHash": "new-content-hash",
     "metadata": {
       "source": "external-system",
       "timestamp": "2024-01-01T00:00:00Z"
     }
   }
   ```

## Monitoring and Troubleshooting

### Check System Status
```bash
# Test the cron endpoint
curl -X POST "https://your-domain.com/api/cron/scan?mode=all"

# Check database logs
SELECT * FROM audit_logs ORDER BY created_at DESC LIMIT 10;
```

### Common Issues

1. **Scans Not Running**
   - Check cron job configuration
   - Verify database connection
   - Review subscription limits

2. **Change Detection Not Working**
   - Ensure subscription tier supports change detection
   - Check webhook endpoint accessibility
   - Verify content hash computation

3. **Performance Issues**
   - Monitor scan frequency
   - Check database performance
   - Review resource usage

## Development

### Adding New Metrics
1. Update `metric_definitions` table
2. Modify `LighthouseScanner` class
3. Update UI components

### Customizing Scan Logic
1. Modify `performScan` method in `LighthouseScanner`
2. Update `runLighthouse` simulation
3. Adjust result processing

### Extending Subscription Tiers
1. Update `getSubscriptionLimits` method
2. Modify database schema
3. Update UI components

## Security Considerations

- **Authentication**: Manual endpoints require user authentication
- **Rate Limiting**: Built-in subscription-based limits
- **Input Validation**: All webhook inputs are validated
- **Audit Logging**: All activities are logged for security

## Performance Optimization

- **Batch Processing**: Multiple websites processed efficiently
- **Error Recovery**: Failed scans don't affect the system
- **Resource Management**: Controlled resource usage
- **Caching**: Optimized database queries

## Support

For issues or questions:
1. Check the troubleshooting section
2. Review application logs
3. Verify database setup
4. Test endpoints manually
5. Check subscription configuration

## Future Enhancements

- **Real-time Notifications**: Push notifications for scan results
- **Advanced Analytics**: Detailed performance insights
- **Custom Metrics**: User-defined performance metrics
- **Integration APIs**: Third-party service integrations
- **Machine Learning**: Predictive performance analysis