# Website Update Alert Service

A FastAPI application that monitors websites for updates and provides alerts when changes are detected.

## Features

- Add websites to monitor with custom check intervals
- Automatic periodic checking for website updates
- REST API for managing websites and viewing alerts
- Background scheduler for continuous monitoring
- SQLite database for data persistence

## API Endpoints

### Base
- `GET /` - Service information and documentation links
- `GET /health` - Health check endpoint
- `GET /docs` - Interactive API documentation
- `GET /redoc` - Alternative API documentation

### Websites
- `POST /websites/` - Add a new website to monitor
- `GET /websites/` - List all monitored websites
- `GET /websites/{id}` - Get specific website details
- `PUT /websites/{id}` - Update website settings
- `DELETE /websites/{id}` - Remove website from monitoring
- `POST /websites/{id}/check` - Manually trigger a check for updates
- `GET /websites/{id}/alerts` - Get alerts for a specific website

### Alerts
- `GET /alerts/` - List all alerts (with optional unread filter)
- `PUT /alerts/{id}/mark-read` - Mark an alert as read

## Installation and Setup

1. Install dependencies:
```bash
pip install -r requirements.txt
```

2. Run the application:
```bash
uvicorn main:app --host 0.0.0.0 --port 8000
```

The application will be available at `http://localhost:8000`

## Environment Variables

- `CHECK_INTERVAL_MINUTES` - How often to check all websites (default: 5 minutes)

## Database

The application uses SQLite with automatic database creation. The database file is stored at `/app/storage/db/db.sqlite`.

## Example Usage

1. Add a website to monitor:
```bash
curl -X POST "http://localhost:8000/websites/" \
     -H "Content-Type: application/json" \
     -d '{
       "url": "https://example.com",
       "name": "Example Website",
       "check_interval_minutes": 60
     }'
```

2. List all websites:
```bash
curl "http://localhost:8000/websites/"
```

3. Get alerts:
```bash
curl "http://localhost:8000/alerts/"
```

## How It Works

1. Websites are checked periodically based on their individual check intervals
2. Content is hashed (MD5) to detect changes
3. When changes are detected, alerts are created
4. Background scheduler runs every 5 minutes to check websites that are due for checking
5. Manual checks can be triggered via the API