# Phone Recorder - Future Ideas / TODO

## Questions to Address

### Key Rotation
- What happens when server keypair changes?
- Current behavior: Old encrypted files can't be decrypted with new key
- Options:
  1. Keep old private key archived for decrypting old files
  2. Sync all files before rotating keys
  3. Store key version/ID in encrypted file header

### Manual Decryption
- Document steps to decrypt files copied via USB from phone
- Need: Python script using server's private key
- Consider: CLI tool in server/ directory

### No-Key Behavior
- Current: Deletes recordings if no public key configured (security-first)
- Alternatives to consider:
  1. Store unencrypted with warning (less secure)
  2. Queue recordings until key configured (could fill storage)
  3. Current behavior is probably correct for security model

---

## Possible Features

### High Priority (if needed)
- [ ] QR code for key import (avoid email/typing)
- [ ] Server URL configuration in app UI (currently requires code change for non-defaults)
- [ ] Manual sync trigger button
- [ ] View sync history/status in app
- [ ] **Display last successful sync time on phone** (e.g., "Last sync: 2 hours ago")
- [ ] **Server status page** - HTML dashboard showing:
  - When phone last synced
  - Total recordings count
  - Recent uploads
  - Disk space usage
  - Could be at `/status` or `/dashboard`

### Medium Priority
- [ ] Configurable recording quality (bitrate, sample rate)
- [ ] Configurable segment duration (currently 2 hours)
- [ ] Delete synced files automatically (with configurable retention)
- [ ] Server: Authentication for upload endpoint
- [ ] Server: HTTPS with Let's Encrypt

### Audio Analysis & Intelligence
- [ ] **Speech detection bar** - Visual indicator showing when speech is detected vs silence
  - Display as additional bar in recording detail view alongside waveform
  - Data comes from batch processing script
- [ ] **Sleeping detection** - Detect periods of sleep/silence for overnight recordings
  - Could help skip to interesting parts
  - Visual indicator in timeline
- [ ] **Auto voice recognition / Speaker identification**
  - Identify who is talking (requires training on voice samples)
  - Label segments by speaker
  - Not text-based (transcripts are unreliable)
- [ ] **Auto highlight generation**
  - Audio-based detection (not text search since transcripts are bad)
  - Example: detect phrase patterns like "Ok, note taken" acoustically
  - Auto-create highlights with tags like "note_taken"
  - Use audio fingerprinting or keyword spotting models

### Viewer UX
- [ ] **Background audio playback** - Keep playing current audio while browsing other recordings
  - Mini player that persists across views
  - Allows reviewing recordings list while listening
- [ ] **Highlight duration** - Currently highlights mark only a point; consider adding end time/duration
- [ ] **Auto-scroll timeline to recordings** - If recordings are only at end of day, auto-scroll so user doesn't have to scroll down to see them

### Low Priority / Nice to Have
- [ ] Multiple server destinations
- [ ] Compression before encryption
- [ ] Resume interrupted uploads
- [ ] Server: Web UI to browse/play recordings
- [ ] Server: Transcription integration

### Infrastructure
- [ ] Systemd service file for server
- [ ] Docker container for server
- [ ] NixOS module for server
- [ ] Backup strategy for server private key

---

## Known Limitations

1. **No streaming encryption**: Entire temp file must complete before encryption
2. **No partial sync**: If upload fails, whole file retries
3. **Single server**: Can only sync to one destination at a time
4. **No authentication**: Anyone who can reach server can upload (relies on encryption for confidentiality)

---

## Testing Notes

### Unit Tests (server/)
```bash
python test_crypto.py
```

### Integration Tests (server/)
```bash
# Start server first
python main.py &
python test_integration.py
```

### Manual Testing Checklist
- [ ] Record short clip, verify .ogg.enc created
- [ ] Verify temp file deleted after encryption
- [ ] Check sync triggers after recording stops
- [ ] Verify hash verification (corrupt a file, see it retry)
- [ ] Test LAN detection with different subnets
- [ ] Test sync mode transitions