# NextSnap Deployment Guide

This guide covers deploying NextSnap using Docker and Docker Compose.

## Prerequisites

- Docker 20.10 or later
- Docker Compose 2.0 or later
- A Nextcloud instance with admin access
- HTTPS setup (required for PWA features)

## Quick Start

### 1. Clone the Repository

```bash
git clone <repository-url>
cd nextsnap
```

### 2. Configure Environment Variables

```bash
cp .env.example .env
```

Edit `.env` and set your values:

```bash
# Generate a secure secret key
python -c "import secrets; print(secrets.token_hex(32))"

# Update .env with:
SECRET_KEY=<generated-key>
NEXTCLOUD_URL=https://your-nextcloud-instance.com
PORT=8000
TZ=America/New_York
```

### 3. Build and Run

```bash
docker-compose up -d
```

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

### 4. Verify Deployment

```bash
# Check container status
docker-compose ps

# Check logs
docker-compose logs -f nextsnap

# Test health endpoint
curl http://localhost:8000/api/health
```

## Production Deployment

### HTTPS Setup (Required)

NextSnap requires HTTPS for PWA features and secure cookies. Use a reverse proxy:

#### Option 1: Nginx

```nginx
server {
    listen 443 ssl http2;
    server_name nextsnap.example.com;

    ssl_certificate /path/to/cert.pem;
    ssl_certificate_key /path/to/key.pem;

    location / {
        proxy_pass http://localhost:8000;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        
        # WebSocket support
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
        
        # Timeouts for large uploads
        proxy_read_timeout 300s;
        proxy_send_timeout 300s;
        client_max_body_size 50M;
    }
}
```

#### Option 2: Caddy

```
nextsnap.example.com {
    reverse_proxy localhost:8000
}
```

#### Option 3: Traefik

Update `docker-compose.yml`:

```yaml
services:
  nextsnap:
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.nextsnap.rule=Host(`nextsnap.example.com`)"
      - "traefik.http.routers.nextsnap.entrypoints=websecure"
      - "traefik.http.routers.nextsnap.tls.certresolver=myresolver"
```

### Environment Variables

| Variable | Required | Default | Description |
|----------|----------|---------|-------------|
| `SECRET_KEY` | Yes | - | Flask secret key for sessions |
| `NEXTCLOUD_URL` | Yes | - | URL of your Nextcloud instance |
| `PORT` | No | 8000 | Port to expose the application |
| `TZ` | No | UTC | Container timezone |
| `FLASK_ENV` | No | production | Flask environment |

### Security Recommendations

1. **Use a Strong Secret Key**
   ```bash
   python -c "import secrets; print(secrets.token_hex(32))"
   ```

2. **Enable HTTPS**
   - Required for PWA installation
   - Required for secure cookies

3. **Keep Docker Images Updated**
   ```bash
   docker-compose pull
   docker-compose up -d
   ```

4. **Restrict Network Access**
   - Only expose port 8000 to reverse proxy
   - Use firewall rules to limit access

5. **Monitor Logs**
   ```bash
   docker-compose logs -f --tail=100 nextsnap
   ```

### Backup and Restore

#### Backup Session Data

```bash
# Create backup
docker run --rm -v nextsnap_flask_sessions:/data -v $(pwd):/backup \
  alpine tar czf /backup/sessions_backup.tar.gz -C /data .
```

#### Restore Session Data

```bash
# Restore backup
docker run --rm -v nextsnap_flask_sessions:/data -v $(pwd):/backup \
  alpine tar xzf /backup/sessions_backup.tar.gz -C /data
```

## Updating

### Pull Latest Changes

```bash
git pull origin main
```

### Rebuild and Restart

```bash
docker-compose down
docker-compose build --no-cache
docker-compose up -d
```

### Check for Breaking Changes

Review `CHANGELOG.md` and update your `.env` if new variables are required.

## Troubleshooting

### Container Won't Start

```bash
# Check logs
docker-compose logs nextsnap

# Check environment variables
docker-compose config
```

### Connection to Nextcloud Fails

1. Verify `NEXTCLOUD_URL` is correct
2. Test Nextcloud connectivity:
   ```bash
   curl -I https://your-nextcloud-instance.com
   ```
3. Check Nextcloud CORS settings
4. Verify user credentials

### PWA Not Installing

1. Ensure HTTPS is enabled
2. Check manifest is accessible: `https://your-domain.com/static/manifest.json`
3. Check service worker: `https://your-domain.com/static/sw.js`
4. Open browser DevTools → Application → Service Workers

### Session Issues

```bash
# Clear session data
docker-compose down
docker volume rm nextsnap_flask_sessions
docker-compose up -d
```

### Large Upload Failures

1. Check `MAX_CONTENT_LENGTH` in `config.py` (default: 50MB)
2. Increase nginx/proxy timeout values
3. Check Nextcloud upload limits

## Performance Tuning

### Gunicorn Workers

Edit `Dockerfile` CMD to adjust workers:

```dockerfile
CMD ["gunicorn", \
     "--workers", "8", \  # Increase for more traffic
     "--bind", "0.0.0.0:8000", \
     ...
```

Rule of thumb: `workers = (2 * CPU_cores) + 1`

### Resource Limits

Add to `docker-compose.yml`:

```yaml
services:
  nextsnap:
    deploy:
      resources:
        limits:
          cpus: '2'
          memory: 1G
        reservations:
          cpus: '0.5'
          memory: 256M
```

## Monitoring

### Health Checks

```bash
# Built-in health endpoint
curl http://localhost:8000/api/health

# Container health status
docker inspect --format='{{.State.Health.Status}}' nextsnap
```

### Logs

```bash
# Follow logs
docker-compose logs -f nextsnap

# Last 100 lines
docker-compose logs --tail=100 nextsnap

# Filter by timestamp
docker-compose logs --since 30m nextsnap
```

### Metrics

Consider adding:
- Prometheus metrics
- Grafana dashboards
- Alert manager for errors

## Advanced Configuration

### Custom Port

```yaml
# docker-compose.yml
ports:
  - "3000:8000"  # Expose on port 3000
```

### External Session Storage

For multi-instance deployments, consider Redis for sessions:

```python
# config.py
SESSION_TYPE = 'redis'
SESSION_REDIS = redis.from_url('redis://redis:6379')
```

### Development Mode

```bash
# Use development compose file
docker-compose -f docker-compose.dev.yml up
```

## Support

- GitHub Issues: <repository-url>/issues
- Documentation: README.md
- Nextcloud Docs: https://docs.nextcloud.com

## License

See LICENSE file for details.