# Changelog

All notable changes to the Wedding Phone project are documented in this file.

## [1.2.0] - 2025-01-24

### Added
- **USB Backup System with CRC32 Verification**
  - Automatic backup to multiple USB drives
  - CRC32 checksum verification for data integrity
  - Configurable backup paths in config.json
  - Web interface for monitoring USB drive status
  - Test backup functionality
  - Automatic cleanup of corrupted backups
  - `setup_usb.sh` script for easy USB drive setup with proper permissions

- **Systemd Service Support**
  - `wedding-phone.service` systemd service file
  - `install_service.sh` automated service installer
  - Auto-start on boot capability
  - Automatic restart on failure
  - Service log viewing with journalctl

- **UV Package Manager Integration**
  - Makefile for simplified commands (`make start`, `make test`, `make sync`)
  - UV-based dependency management
  - No-build direct script execution
  - Faster, more reliable installation

- **Greeting Delay Feature**
  - Configurable delay (0-10 seconds) before greeting plays
  - Web interface slider for real-time adjustment
  - Useful for giving guests time to position phone

- **Extra Button Support**
  - Optional GPIO button for playing sounds during recording
  - Button sound only plays during recording phase (not greeting)
  - Separate PyAudio instance prevents blocking
  - Configurable button sound upload via web interface

### Changed
- **Immediate Hook Detection**
  - Playback and recording now check GPIO directly for instant response
  - No more delays when handset is hung up
  - Greeting stops immediately when phone is hung up
  - Recording stops immediately when phone is hung up

- **Recording Improvements**
  - Minimum 1-second duration required to save recording
  - Recordings shorter than 1 second are automatically deleted
  - Aborted recordings are cleaned up automatically
  - No more empty or accidental recordings

- **Volume Control Enhancement**
  - Real-time volume adjustment (0-100%)
  - Volume persists in user_config.json
  - Applies to both greetings and button sounds

- **Configuration System Overhaul**
  - Separated system config (config.json) from runtime config (user_config.json)
  - No hardcoded paths (e.g., /home/berwn)
  - All GPIO pins configurable
  - All paths configurable (relative or absolute)
  - Backup settings in configuration

- **Python Version Requirement**
  - Updated from Python 3.7+ to Python 3.8+ (Flask requirement)

### Fixed
- **USB Backup Permissions**
  - Fixed "Permission denied" errors on USB backup
  - Better error messages with fix suggestions
  - Proper permission checking for user-mounted drives
  - No longer requires running as root

- **UV Build Issues**
  - Removed hatchling build system (not needed for scripts)
  - Uses `--no-project` mode for direct execution
  - Simplified dependency installation
  - No more build errors

- **Extra Button Sound Playback**
  - Fixed button sound not playing during recording
  - Uses separate PyAudio instance to prevent stream conflicts
  - Button sound plays completely without interruption
  - Recording continues while button sound plays

- **Template Regeneration**
  - Templates now regenerate when deleted
  - New features appear after template deletion
  - Documented template regeneration process

### Security
- **Service Hardening**
  - NoNewPrivileges enabled
  - PrivateTmp enabled
  - Runs as regular user (not root)
  - GPIO and audio group access configured

### Documentation
- **Comprehensive README Updates**
  - Added USB backup guide with mounting instructions
  - Added systemd service installation guide
  - Added Makefile usage documentation
  - Added greeting delay documentation
  - Added extra button operation guide
  - Added troubleshooting section expansions
  - Updated Python version requirements
  - Added UV installation and usage guide

- **New Documentation Files**
  - `CHANGELOG.md` - This file
  - `setup_usb.sh` - USB drive setup script

### API Endpoints Added
- `GET /api/backup/status` - Get USB backup drive status
- `POST /api/backup/test` - Test backup to all USB drives
- `GET /api/greeting_delay` - Get current greeting delay
- `POST /api/greeting_delay` - Set greeting delay
- `GET /api/volume` - Get current volume
- `POST /api/volume` - Set volume

### Configuration Changes
New sections in `config.json`:
```json
{
  "backup": {
    "enabled": true,
    "usb_paths": ["/media/usb0", "/media/usb1"],
    "verify_crc": true,
    "backup_on_write": true
  },
  "gpio": {
    "extra_button_enabled": true,
    "extra_button_pin": 27,
    "extra_button_pressed_state": "LOW"
  },
  "system": {
    "greeting_delay_seconds": 0,
    "volume": 70
  }
}
```

## [1.0.0] - Initial Release

### Features
- Rotary phone hookswitch detection via GPIO
- Custom greeting message playback
- Voice recording after greeting
- Web interface for file management
- HiFiBerry DAC+ADC Pro support
- Dial tone generation
- Basic configuration via config file

---

## Upgrade Notes

### Upgrading from 1.0.0 to 1.2.0

1. **Update Python version**
   ```bash
   python3 --version  # Must be 3.8 or higher
   ```

2. **Update configuration file**
   - Copy `config.example.json` to see new options
   - Add `backup` section if using USB backup
   - Add `gpio.extra_button_*` if using extra button
   - Add `system.greeting_delay_seconds` and `system.volume`

3. **Install UV (recommended)**
   ```bash
   curl -LsSf https://astral.sh/uv/install.sh | sh
   ```

4. **Install dependencies**
   ```bash
   make sync
   ```

5. **Delete old templates** (to get new web features)
   ```bash
   rm -rf templates/
   ```

6. **Optional: Install as service**
   ```bash
   ./install_service.sh
   ```

7. **Optional: Setup USB backup**
   ```bash
   sudo ./setup_usb.sh
   ```

---

## Known Issues

- Template files must be manually deleted to get UI updates (this is by design)
- USB drives must be mounted with proper user permissions for backup to work
- PyAudio installation may require system packages: `sudo apt-get install python3-pyaudio portaudio19-dev`

---

## Future Enhancements

Potential features for future releases:
- Web-based configuration editor
- Multiple language support
- Email notifications for new recordings
- Cloud backup integration
- Mobile app for remote management
- Recording transcription
- Guest photo capture
- QR code generation for easy access