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Add TTS model metadata and documentation

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TTS Model (Piper VITS):
- MODEL_CARD: Voice model information
- tokens.txt: Phoneme tokenization
- onnx.json: Model configuration
- Model: en_US-lessac-medium (60MB ONNX - not in git)

Documentation:
- APP_REVIEW_NOTES.txt: App Store review notes
- specs/: Feature specifications
- plugins/: Expo config plugins

.gitignore updates:
- Exclude large ONNX models (60MB+)
- Exclude espeak-ng-data (phoneme data)
- Exclude credentials.json
- Exclude store-screenshots/

Note: TTS models must be downloaded separately.
See specs/ for setup instructions.
This commit is contained in:
Sergei 2026-01-14 19:10:13 -08:00
parent da2c4bebc9
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.gitignore vendored
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@ -42,3 +42,15 @@ app-example
/ios /ios
/android /android
.git-credentials .git-credentials
# TTS Models (too large for git)
assets/tts-models/**/*.onnx
assets/tts-models/**/espeak-ng-data/
# Credentials
credentials.json
# Store screenshots
store-screenshots/
# Build artifacts
WellNuoLite-Android/

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═══════════════════════════════════════════════════════════════
WELLNUO - APP REVIEW NOTES FOR APPLE
═══════════════════════════════════════════════════════════════
IMPORTANT: This is a B2B professional monitoring application
═══════════════════════════════════════════════════════════════
1. BUSINESS MODEL CLARIFICATION
═══════════════════════════════════════════════════════════════
WellNuo is a professional elderly care monitoring system, not a consumer application.
Our business operates as follows:
• Clients purchase physical monitoring equipment (sensors, devices)
• Professional technicians install equipment at client's location
• WellNuo staff creates accounts after service contract is signed
• The app provides FREE access to monitoring data from installed equipment
The app is 100% FREE - no in-app purchases, no paid features, no subscriptions.
═══════════════════════════════════════════════════════════════
2. ACCOUNT MANAGEMENT (Guideline 5.1.1v - Account Deletion)
═══════════════════════════════════════════════════════════════
WHY ACCOUNTS ARE NOT CREATED IN-APP:
• Accounts are created by WellNuo staff, not by end users
• Account creation happens AFTER signing service contract
• Users receive login credentials from our support team
• This is a B2B professional service, not consumer self-service
ACCOUNT DELETION PROCESS:
• Account deletion is part of service contract termination
• Requires equipment uninstallation by our technicians
• Users contact WellNuo support to request account deletion
• Deletion process is documented in Privacy Policy
• Support contact: [YOUR SUPPORT EMAIL - e.g., support@wellnuo.com]
This follows Apple's guidelines for B2B/enterprise apps where account management happens through business contracts, not self-service.
═══════════════════════════════════════════════════════════════
3. IN-APP PURCHASE (Guideline 3.1.1 - Payments)
═══════════════════════════════════════════════════════════════
The app is completely FREE with no paid features.
WHY NO IN-APP PURCHASE:
• App is 100% free to download and use
• No digital content is sold within the app
• No premium features behind paywall
• No subscriptions through App Store
REVENUE MODEL:
• Revenue comes from physical monitoring equipment sales
• Professional installation service fees
• B2B service contracts (outside the app)
• Similar business model to: Ring, Nest, Arlo (IoT companion apps)
The app is a FREE companion to physical monitoring equipment, similar to security camera apps or smart home device apps.
═══════════════════════════════════════════════════════════════
4. TEST ACCOUNT CREDENTIALS
═══════════════════════════════════════════════════════════════
For review purposes, please use these credentials:
Username: [YOUR TEST USERNAME]
Password: [YOUR TEST PASSWORD]
The test account provides access to demo monitoring data.
═══════════════════════════════════════════════════════════════
5. PRIVACY & DATA SECURITY
═══════════════════════════════════════════════════════════════
• All data is encrypted in transit (HTTPS)
• User credentials stored in iOS SecureStore (encrypted)
• Privacy Policy available at: [YOUR PRIVACY POLICY URL]
• Terms of Service available at: [YOUR TERMS URL]
• Account deletion instructions in Privacy Policy
═══════════════════════════════════════════════════════════════
6. PREVIOUS REVIEW ISSUES - RESOLVED
═══════════════════════════════════════════════════════════════
Submission ID: 0992528e-4ce9-4167-9a1b-07f4334a8055
✅ Guideline 4.0 - Navigation: Added back button to Chat screen
✅ Guideline 2.1 - Account Creation: Clarified B2B model (no self-service signup)
✅ Guideline 5.1.1(v) - Account Deletion: Documented support-based deletion process
✅ Guideline 3.1.1 - IAP: App is 100% free, no paid features
═══════════════════════════════════════════════════════════════
Thank you for reviewing WellNuo!
We are committed to providing a safe, professional monitoring solution for elderly care.
If you have any questions about our B2B model or need additional information,
please don't hesitate to contact us.
═══════════════════════════════════════════════════════════════

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assets/tts-models/vits-piper-en_US-lessac-medium/MODEL_CARD Normal file
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# Model card for lessac (medium)
* Language: en_US (English, United States)
* Speakers: 1
* Quality: medium
* Samplerate: 22,050Hz
## Dataset
* URL: https://www.cstr.ed.ac.uk/projects/blizzard/2013/lessac_blizzard2013/
* License: https://www.cstr.ed.ac.uk/projects/blizzard/2013/lessac_blizzard2013/license.html
## Training
Trained from scratch.

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assets/tts-models/vits-piper-en_US-lessac-medium/en_US-lessac-medium.onnx.json Normal file
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{
"audio": {
"sample_rate": 22050,
"quality": "medium"
},
"espeak": {
"voice": "en-us"
},
"inference": {
"noise_scale": 0.667,
"length_scale": 1,
"noise_w": 0.8
},
"phoneme_type": "espeak",
"phoneme_map": {},
"phoneme_id_map": {
"_": [
0
],
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],
"̺": [
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"̻": [
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]
},
"num_symbols": 256,
"num_speakers": 1,
"speaker_id_map": {},
"piper_version": "1.0.0",
"language": {
"code": "en_US",
"family": "en",
"region": "US",
"name_native": "English",
"name_english": "English",
"country_english": "United States"
},
"dataset": "lessac"
}

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assets/tts-models/vits-piper-en_US-lessac-medium/tokens.txt Normal file
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_ 0
^ 1
$ 2
3
! 4
' 5
( 6
) 7
, 8
- 9
. 10
: 11
; 12
? 13
a 14
b 15
c 16
d 17
e 18
f 19
h 20
i 21
j 22
k 23
l 24
m 25
n 26
o 27
p 28
q 29
r 30
s 31
t 32
u 33
v 34
w 35
x 36
y 37
z 38
æ 39
ç 40
ð 41
ø 42
ħ 43
ŋ 44
œ 45
ǀ 46
ǁ 47
ǂ 48
ǃ 49
ɐ 50
ɑ 51
ɒ 52
ɓ 53
ɔ 54
ɕ 55
ɖ 56
ɗ 57
ɘ 58
ə 59
ɚ 60
ɛ 61
ɜ 62
ɞ 63
ɟ 64
ɠ 65
ɡ 66
ɢ 67
ɣ 68
ɤ 69
ɥ 70
ɦ 71
ɧ 72
ɨ 73
ɪ 74
ɫ 75
ɬ 76
ɭ 77
ɮ 78
ɯ 79
ɰ 80
ɱ 81
ɲ 82
ɳ 83
ɴ 84
ɵ 85
ɶ 86
ɸ 87
ɹ 88
ɺ 89
ɻ 90
ɽ 91
ɾ 92
ʀ 93
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ʃ 96
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ʍ 103
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ʐ 106
ʑ 107
ʒ 108
ʔ 109
ʕ 110
ʘ 111
ʙ 112
ʛ 113
ʜ 114
ʝ 115
ʟ 116
ʡ 117
ʢ 118
ʲ 119
ˈ 120
ˌ 121
ː 122
ˑ 123
˞ 124
β 125
θ 126
χ 127
ᵻ 128
ⱱ 129
0 130
1 131
2 132
3 133
4 134
5 135
6 136
7 137
8 138
9 139
̧ 140
̃ 141
̪ 142
̯ 143
̩ 144
ʰ 145
ˤ 146
ε 147
↓ 148
# 149
" 150
↑ 151
̺ 152
̻ 153

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/**
* Expo Config Plugin to bundle TTS model files for iOS
* Uses a Run Script build phase to copy models during build
*/
const { withXcodeProject } = require('@expo/config-plugins');
const path = require('path');
const fs = require('fs');
const withTTSModels = (config) => {
return withXcodeProject(config, async (config) => {
const projectRoot = config.modRequest.projectRoot;
const xcodeProject = config.modResults;
// Source model directory (relative to project root)
const modelSrcDir = path.join(projectRoot, 'assets', 'tts-models');
if (!fs.existsSync(modelSrcDir)) {
console.warn('[withTTSModels] ⚠️ Model directory not found:', modelSrcDir);
return config;
}
console.log('[withTTSModels] Found models at:', modelSrcDir);
// Get the first target
const target = xcodeProject.getFirstTarget();
if (!target) {
console.error('[withTTSModels] ❌ No target found');
return config;
}
// Path relative to ios directory (where Xcode project lives)
const iosDir = path.join(projectRoot, 'ios');
const relativeModelPath = path.relative(iosDir, modelSrcDir);
console.log('[withTTSModels] Relative path from ios/:', relativeModelPath);
// Create a Run Script build phase to copy ONLY Lessac model during build
const scriptName = '[TTS] Copy Model Files';
const scriptContent = [
'# Copy TTS model files to app bundle (ONLY Lessac voice)',
'echo "📦 Copying TTS model to app bundle..."',
'',
'SOURCE_DIR="${SRCROOT}/' + relativeModelPath + '"',
'DEST_DIR="${BUILT_PRODUCTS_DIR}/${PRODUCT_NAME}.app/assets/tts-models"',
'LESSAC_MODEL="vits-piper-en_US-lessac-medium"',
'',
'# Only copy Lessac model',
'if [ -d "$SOURCE_DIR/$LESSAC_MODEL" ]; then',
' mkdir -p "$DEST_DIR"',
' cp -R "$SOURCE_DIR/$LESSAC_MODEL" "$DEST_DIR/"',
' MODEL_SIZE=$(du -sh "$SOURCE_DIR/$LESSAC_MODEL" | cut -f1)',
' echo "✅ Lessac TTS model copied successfully ($MODEL_SIZE)"',
' echo " From: $SOURCE_DIR/$LESSAC_MODEL"',
' echo " To: $DEST_DIR/$LESSAC_MODEL"',
'else',
' echo "⚠️ Lessac model not found at: $SOURCE_DIR/$LESSAC_MODEL"',
' exit 1',
'fi'
].join('\n');
// Check if script already exists
const buildPhases = xcodeProject.hash.project.objects.PBXShellScriptBuildPhase || {};
let scriptExists = false;
for (const key in buildPhases) {
if (buildPhases[key].name === scriptName) {
scriptExists = true;
console.log('[withTTSModels] Run Script phase already exists');
break;
}
}
if (!scriptExists) {
// Add the Run Script build phase
xcodeProject.addBuildPhase(
[],
'PBXShellScriptBuildPhase',
scriptName,
target.uuid,
{
shellPath: '/bin/sh',
shellScript: scriptContent,
// Run before Copy Bundle Resources phase
runOnlyForDeploymentPostprocessing: 0
}
);
console.log('[withTTSModels] ✅ Added Run Script build phase');
}
console.log('[withTTSModels] ✅ Plugin configured successfully');
return config;
});
};
module.exports = withTTSModels;

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# FEATURE-001: Voice Integration for Chat
## Summary
Integrate voice communication with AI in the chat screen - speech recognition for input and text-to-speech for AI responses.
## Status: 🟡 In Progress
## Priority: High
## Dependencies
- expo-speech-recognition (STT)
- expo-speech (fallback TTS)
- react-native-sherpa-onnx-offline-tts (neural TTS - cross-platform iOS/Android)
---
## Requirements
### Functional
1. **Voice Input (STT)**
- Tap microphone button to start listening
- Real-time transcript display
- Auto-send when user stops speaking OR tap again to stop
- Visual indicator when listening (pulsing animation)
2. **Voice Output (TTS)**
- AI responses are spoken automatically
- Visual indicator when speaking
- Stop button to interrupt speech
- Multiple voice options (Lessac/Ryan/Alba)
3. **States & Indicators**
- `isListening` - microphone active, user speaking
- `isSpeaking` - AI voice response playing
- `ttsInitialized` - TTS engine ready
- Animated pulse on microphone when listening
### Non-Functional
- Works offline (SherpaTTS uses local neural models)
- Cross-platform: iOS and Android
- Low latency speech synthesis
---
## Technical Design
### Architecture
```
┌─────────────────────────────────────────────────────────┐
│ chat.tsx │
├─────────────────────────────────────────────────────────┤
│ State: │
│ - isListening (from useSpeechRecognition) │
│ - recognizedText (from useSpeechRecognition) │
│ - isSpeaking │
│ - ttsInitialized │
│ - pulseAnim (Animated.Value) │
├─────────────────────────────────────────────────────────┤
│ Handlers: │
│ - handleVoiceToggle() - start/stop listening │
│ - handleVoiceSend() - send recognized text │
│ - speakText(text) - speak AI response │
│ - stopSpeaking() - interrupt speech │
└─────────────────────────────────────────────────────────┘
│ │
▼ ▼
┌─────────────────────┐ ┌─────────────────────────────────┐
│ useSpeechRecognition│ │ sherpaTTS.ts │
│ (hooks/) │ │ (services/) │
├─────────────────────┤ ├─────────────────────────────────┤
│ - startListening() │ │ - initializeSherpaTTS() │
│ - stopListening() │ │ - speak(text, options) │
│ - recognizedText │ │ - stop() │
│ - isListening │ │ - isAvailable() │
│ - isAvailable │ │ - setVoice(voiceId) │
└─────────────────────┘ └─────────────────────────────────┘
│ │
▼ ▼
┌─────────────────────┐ ┌─────────────────────────────────┐
│expo-speech- │ │ react-native-sherpa-onnx- │
│recognition │ │ offline-tts (Piper VITS) │
│(native module) │ │ (native module) │
└─────────────────────┘ └─────────────────────────────────┘
```
### Available Piper Voices
| ID | Name | Gender | Accent | Model |
|----|------|--------|--------|-------|
| lessac | Lessac | Female | US | en_US-lessac-medium |
| ryan | Ryan | Male | US | en_US-ryan-medium |
| alba | Alba | Female | UK | en_GB-alba-medium |
### Voice Flow
```
User taps mic button
│
▼
handleVoiceToggle()
│
┌─────┴─────┐
│ isListening?│
└─────┬─────┘
│
NO │ YES
│ │ │
│ │ ▼
│ │ stopListening()
│ │ handleVoiceSend()
│ │
▼ │
startListening()
│
▼
Speech Recognition active
(recognizedText updates)
│
▼
User stops speaking / taps again
│
▼
handleVoiceSend()
│
▼
sendMessage(recognizedText)
│
▼
AI responds
│
▼
speakText(response)
│
▼
SherpaTTS plays audio
```
---
## Implementation Steps
### Phase 1: Setup (DONE)
- [x] Add dependencies to package.json
- [x] Create sherpaTTS.ts service
- [x] Create useSpeechRecognition.ts hook
- [x] Add voice imports to chat.tsx
- [x] Add voice states (isListening, isSpeaking, ttsInitialized, pulseAnim)
### Phase 2: Logic (DONE)
- [x] Implement handleVoiceToggle()
- [x] Implement handleVoiceSend()
- [x] Implement speakText()
- [x] Implement stopSpeaking()
- [x] TTS initialization on component mount
- [x] Auto-speak AI responses
### Phase 3: UI (DONE)
- [x] Add microphone button to input area
- [x] Add voice status indicator (Listening.../Speaking...)
- [x] Add stop button for speech
- [x] Add pulse animation for listening state
- [x] Add styles for voice UI elements
### Phase 4: Build & Test (IN PROGRESS)
- [ ] Run npm install
- [ ] Run expo prebuild --clean
- [ ] Build iOS (native modules required)
- [ ] Test on iOS simulator
- [ ] Test on Android (emulator or device)
### Phase 5: Polish (TODO)
- [ ] Handle permissions properly (microphone access)
- [ ] Add voice picker UI
- [ ] Add speech rate control
- [ ] Test edge cases (no network, no mic permission)
---
## Files Modified/Created
| File | Status | Description |
|------|--------|-------------|
| `package.json` | Modified | Added voice dependencies |
| `services/sherpaTTS.ts` | Created | SherpaTTS service for offline TTS |
| `hooks/useSpeechRecognition.ts` | Created | Speech recognition hook |
| `app/(tabs)/chat.tsx` | Modified | Voice integration in chat |
---
## Testing Checklist
### Manual Testing
- [ ] Tap mic button - starts listening
- [ ] Speak - text appears in input field
- [ ] Tap again - sends message
- [ ] AI responds - voice speaks response
- [ ] Tap stop - speech stops immediately
- [ ] Mic button disabled during sending
- [ ] Visual indicators show correct state
### Edge Cases
- [ ] No microphone permission - shows alert
- [ ] TTS not available - falls back to expo-speech
- [ ] Empty speech recognition - doesn't send
- [ ] Long AI response - speech handles gracefully
- [ ] Interrupt speech and start new input
---
## Notes
### SherpaTTS Cross-Platform Support
- **iOS**: Uses native module via bridged ObjC/Swift
- **Android**: Uses native module via JNI/Kotlin
- **Model files**: Must be bundled in app (assets/tts-models/)
- **Size**: ~20MB per voice model
### Known Limitations
- Speech recognition requires device microphone permission
- SherpaTTS requires native build (not Expo Go)
- Model download may be needed on first launch
---
## Voice Interaction Scenarios (All Cases)
### State Machine
```
┌─────────────────────────────────────────────────────────────┐
│ VOICE STATE MACHINE │
├─────────────────────────────────────────────────────────────┤
│ │
│ ┌──────────┐ │
│ │ IDLE │◄────────────────────────────────────┐ │
│ └────┬─────┘ │ │
│ │ tap mic │ │
│ ▼ │ │
│ ┌──────────┐ │ │
│ │LISTENING │───── user stops / tap ─────────┐ │ │
│ └────┬─────┘ │ │ │
│ │ recognized text │ │ │
│ ▼ │ │ │
│ ┌──────────┐ ▼ │ │
│ │PROCESSING│─────────────────────────► SENDING │ │
│ └────┬─────┘ │ │ │
│ │ AI responded │ │ │
│ ▼ │ │ │
│ ┌──────────┐ │ │ │
│ │ SPEAKING │◄─────────────────────────────┘ │ │
│ └────┬─────┘ │ │
│ │ finished / user tap stop │ │
│ └───────────────────────────────────────────┘ │
│ │
└─────────────────────────────────────────────────────────────┘
```
### A. Happy Path Scenarios
| # | Scenario | Expected Behavior | Status |
|---|----------|-------------------|--------|
| A1 | User taps mic → speaks → taps again | Text recognized → sent → AI responds → spoken | ✅ |
| A2 | User listens to full AI response | TTS finishes → returns to IDLE | ✅ |
| A3 | User stops TTS with stop button | TTS interrupted → can tap mic again | ✅ |
| A4 | User types text manually | Message sent → AI responds → spoken | ✅ |
### B. Interruptions & Conflicts
| # | Scenario | Problem | Solution | Status |
|---|----------|---------|----------|--------|
| B1 | Tap mic while AI speaking | Mic would hear TTS | Block mic while `isSpeaking` | ✅ DONE |
| B2 | AI speaking, user wants to stop | No way to interrupt | Stop button (red) | ✅ DONE |
| B3 | User speaking, changes mind | Need to cancel without sending | Tap again = cancel (no text = don't send) | ✅ DONE |
| B4 | AI speaking, user switches tab | Should TTS stop? | Stop TTS on blur | ⚠️ TODO |
| B5 | App goes to background during TTS | TTS continues in background? | Platform-specific behavior | ⚠️ TODO |
| B6 | Double/triple tap on mic | States get confused | Debounce + transition lock | ⚠️ TODO |
### C. Speech Recognition Errors (STT)
| # | Scenario | Problem | Solution | Status |
|---|----------|---------|----------|--------|
| C1 | No microphone permission | Speech recognition fails | Show permission alert + Open Settings | ✅ DONE |
| C2 | Microphone busy (other app) | Can't start recording | Show "Microphone busy" error | ⚠️ TODO |
| C3 | User silent for 5+ seconds | No text to send | Auto-cancel with hint | ⚠️ TODO |
| C4 | Speech recognition returns empty | Nothing recognized | Show "Didn't catch that" + auto-hide | ✅ DONE |
| C5 | Network unavailable (Android) | Recognition doesn't work | Expo STT needs network on Android | ⚠️ NOTE |
| C6 | Unsupported language | Recognition works poorly | Hardcode 'en-US' | ✅ DONE |
### D. Text-to-Speech Errors (TTS)
| # | Scenario | Problem | Solution | Status |
|---|----------|---------|----------|--------|
| D1 | SherpaTTS not initialized | Model not loaded | Fallback to expo-speech | ⚠️ TODO |
| D2 | SherpaTTS crashes mid-playback | Speech interrupted | Handle error, reset state | ⚠️ TODO |
| D3 | Very long AI response | TTS plays for 2+ minutes | Show progress or split | ⚠️ TODO |
| D4 | TTS model not downloaded | First launch without network | Bundle model or pre-download | ⚠️ NOTE |
| D5 | Voice sounds bad | Model quality issue | Voice picker (Lessac/Ryan/Alba) | ⚠️ TODO |
### E. UI Edge Cases
| # | Scenario | Problem | Solution | Status |
|---|----------|---------|----------|--------|
| E1 | TextInput focused + tap mic | Keyboard in the way | Hide keyboard when listening | ⚠️ TODO |
| E2 | User typing + taps mic | What to do with typed text? | Keep or replace? | ⚠️ TODO |
| E3 | Scroll chat during TTS | Unclear which message is playing | Highlight speaking message | ⚠️ TODO |
| E4 | Multiple messages queued | Which one to speak? | Only latest AI message | ✅ DONE |
| E5 | AI responds in chunks (streaming) | When to start TTS? | After full response | ✅ DONE |
### F. Permission Scenarios
| # | Scenario | Action | Status |
|---|----------|--------|--------|
| F1 | First launch - no permission | Show custom UI → request | ⚠️ TODO |
| F2 | Permission denied before | Open Settings app | ⚠️ TODO |
| F3 | Permission "Ask Every Time" (iOS) | Request each time | ⚠️ TODO |
| F4 | Permission revoked during session | Graceful degradation | ⚠️ TODO |
### Implementation Priority
**🔴 Critical (voice won't work without these):**
- B1: Block mic during speaking ✅ DONE
- B2: Stop button ✅ DONE
- C1: Permission handling
- D1: TTS fallback
**🟡 Important (UX suffers without these):**
- B3: Cancel recording without sending
- C3: Timeout on silence
- C4: "Didn't catch that" feedback
- E1: Hide keyboard
- E3: Visual indicator for speaking message
**🟢 Nice to have:**
- B4-B5: Background behavior
- E5: Streaming TTS
- Voice picker UI
---
## Related
- Main WellNuo voice.tsx (reference implementation)
- [expo-speech-recognition docs](https://docs.expo.dev/versions/latest/sdk/speech-recognition/)
- [sherpa-onnx](https://github.com/k2-fsa/sherpa-onnx)

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{
"elements": [
{
"id": "legend",
"type": "card",
"title": "LEGEND: Voice Integration",
"borderColor": "gray",
"tags": ["Reference"],
"description": "**Color Coding:**\n\n🔴 `red` = User Action (tap, speak)\n🔵 `blue` = App Logic / Screen\n🟣 `purple` = Native Module\n🟢 `green` = External Service (AI API)\n🟠 `orange` = Warning / Edge Case\n⚫ `gray` = Reference\n\n**States:**\n- `isListening` - Microphone active\n- `isSpeaking` - TTS playing\n- `ttsInitialized` - TTS ready\n- `recognizedText` - Speech transcript",
"x": 50,
"y": 50,
"connections": []
},
{
"id": "step-001",
"type": "card",
"title": "Chat Screen",
"borderColor": "blue",
"tags": ["Screen"],
"description": "**User sees:**\n- Message list\n- Input field\n- 🎤 Microphone button\n- Send button\n\n**Initial state:**\n```\nisListening: false\nisSpeaking: false\nttsInitialized: false\n```\n\n**On mount:** Initialize TTS",
"x": 100,
"y": 200,
"connections": [
{ "to": "step-002" },
{ "to": "step-010" }
]
},
{
"id": "step-002",
"type": "card",
"title": "App: Initialize TTS",
"borderColor": "blue",
"tags": ["App"],
"description": "**useEffect on mount:**\n```javascript\nconst initTTS = async () => {\n const success = await \n sherpaTTS.initialize();\n setTtsInitialized(success);\n};\ninitTTS();\n```\n\n**Cleanup on unmount:**\n```javascript\nsherpaTTS.deinitialize();\n```",
"x": 500,
"y": 200,
"connections": [
{ "to": "step-003" },
{ "to": "step-004" }
]
},
{
"id": "step-003",
"type": "card",
"title": "SherpaTTS: Load Model",
"borderColor": "purple",
"tags": ["Native"],
"description": "**Native Module: TTSManager**\n\n1. Load Piper ONNX model\n2. Load tokens.txt\n3. Initialize espeak-ng-data\n\n**Model paths (iOS):**\n```\nassets/tts-models/\n vits-piper-en_US-lessac-medium/\n en_US-lessac-medium.onnx\n tokens.txt\n espeak-ng-data/\n```",
"x": 900,
"y": 200,
"connections": [
{ "to": "step-005" },
{ "to": "err-001" }
]
},
{
"id": "step-004",
"type": "card",
"title": "Fallback: expo-speech",
"borderColor": "orange",
"tags": ["App", "Fallback"],
"description": "**When SherpaTTS unavailable:**\n- Expo Go mode (no native)\n- Model files missing\n- Device not supported\n\n**Fallback:**\n```javascript\nif (!sherpaTTS.isAvailable()) {\n ExpoSpeech.speak(text, {\n language: 'en-US',\n rate: 0.9\n });\n}\n```",
"x": 500,
"y": 400,
"connections": []
},
{
"id": "step-005",
"type": "card",
"title": "TTS Ready",
"borderColor": "blue",
"tags": ["App"],
"description": "**State updated:**\n```\nttsInitialized: true\n```\n\n**Available voices:**\n| ID | Name | Gender |\n|----|------|--------|\n| lessac | Lessac | Female US |\n| ryan | Ryan | Male US |\n| alba | Alba | Female UK |",
"x": 900,
"y": 400,
"connections": []
},
{
"id": "err-001",
"type": "card",
"title": "ERROR: TTS Init Failed",
"borderColor": "red",
"tags": ["Error"],
"description": "**When:**\n- Native module missing\n- Model files not found\n- Memory allocation failed\n\n**App state:**\n```\nttsInitialized: false\nerror: 'Native module not available'\n```\n\n**Fallback:** Use expo-speech",
"x": 1300,
"y": 200,
"connections": [
{ "to": "step-004" }
]
},
{
"id": "step-010",
"type": "card",
"title": "User: Tap 🎤 Button",
"borderColor": "red",
"tags": ["User"],
"description": "**User taps microphone button**\n\nButton appearance:\n- Default: Outline mic icon\n- Active: Filled mic, primary color\n- Disabled: Grayed out (0.5 opacity)\n\n**Triggers:** `handleVoiceToggle()`",
"x": 100,
"y": 600,
"connections": [
{ "to": "step-011" }
]
},
{
"id": "step-011",
"type": "card",
"title": "App: handleVoiceToggle()",
"borderColor": "blue",
"tags": ["App"],
"description": "**Decision logic:**\n```javascript\nif (isListening) {\n stopListening();\n handleVoiceSend();\n} else {\n startListening();\n}\n```\n\n**Check availability:**\n```javascript\nif (!speechRecognitionAvailable) {\n Alert.alert('Not Available');\n return;\n}\n```",
"x": 500,
"y": 600,
"connections": [
{ "to": "step-012" },
{ "to": "step-020" },
{ "to": "err-002" }
]
},
{
"id": "err-002",
"type": "card",
"title": "ERROR: No Mic Permission",
"borderColor": "red",
"tags": ["Error"],
"description": "**When:**\n- User denied microphone access\n- Permission not requested\n\n**App shows:**\n```\nAlert: 'Microphone Access Required'\n\n'Please enable microphone access\nin Settings to use voice input.'\n```\n\n**Resolution:** Open Settings",
"x": 500,
"y": 800,
"connections": []
},
{
"id": "step-012",
"type": "card",
"title": "App: Start Listening",
"borderColor": "blue",
"tags": ["App"],
"description": "**Actions:**\n1. Reset `recognizedText`\n2. Start pulse animation\n3. Call native speech recognition\n\n```javascript\nsetRecognizedText('');\nAnimated.loop(\n Animated.sequence([...])\n).start();\nawait startListening();\n```",
"x": 900,
"y": 600,
"connections": [
{ "to": "step-013" }
]
},
{
"id": "step-013",
"type": "card",
"title": "expo-speech-recognition",
"borderColor": "purple",
"tags": ["Native"],
"description": "**Native Module: ExpoSpeechRecognition**\n\n```javascript\nExpoSpeechRecognitionModule.start({\n lang: 'en-US',\n interimResults: true,\n maxAlternatives: 1,\n continuous: false\n});\n```\n\n**Events:**\n- `start` → setIsListening(true)\n- `result` → setRecognizedText()\n- `end` → setIsListening(false)\n- `error` → handle error",
"x": 1300,
"y": 600,
"connections": [
{ "to": "step-014" }
]
},
{
"id": "step-014",
"type": "card",
"title": "UI: Listening State",
"borderColor": "blue",
"tags": ["Screen"],
"description": "**Visual indicators:**\n\n1. **Mic button:**\n - Background: Primary color\n - Pulsing animation (scale 1.0 → 1.2)\n\n2. **Status bar:**\n ```\n 🔵 Listening...\n ```\n\n3. **Input field:**\n - Shows real-time transcript\n - Updates on each interim result",
"x": 1300,
"y": 800,
"connections": [
{ "to": "step-015" }
]
},
{
"id": "step-015",
"type": "card",
"title": "User: Speaking",
"borderColor": "red",
"tags": ["User"],
"description": "**User speaks into microphone**\n\n**Real-time transcript:**\n```\n\"Hello, how are you today?\"\n```\n\n**Interim results update:**\n- Partial words appear as spoken\n- Final result when silence detected\n\n**To stop:** Tap mic again OR stop speaking",
"x": 1300,
"y": 1000,
"connections": [
{ "to": "step-020" }
]
},
{
"id": "step-020",
"type": "card",
"title": "App: Stop & Send",
"borderColor": "blue",
"tags": ["App"],
"description": "**handleVoiceSend():**\n```javascript\nconst textToSend = \n recognizedText.trim();\n\nif (textToSend) {\n setInputText(textToSend);\n sendMessage(textToSend);\n setRecognizedText('');\n}\n```\n\n**Validation:**\n- Skip if empty transcript\n- Trim whitespace",
"x": 100,
"y": 1000,
"connections": [
{ "to": "step-021" },
{ "to": "err-003" }
]
},
{
"id": "err-003",
"type": "card",
"title": "WARNING: Empty Transcript",
"borderColor": "orange",
"tags": ["Warning"],
"description": "**When:**\n- User tapped mic but didn't speak\n- Background noise only\n- Recognition failed\n\n**Behavior:**\n- Don't send empty message\n- Return to idle state\n- No error shown to user",
"x": 100,
"y": 1200,
"connections": []
},
{
"id": "step-021",
"type": "card",
"title": "App: Send Message",
"borderColor": "blue",
"tags": ["App", "API"],
"description": "**Add user message to chat:**\n```javascript\nsetMessages(prev => [...prev, {\n role: 'user',\n content: textToSend\n}]);\n```\n\n**Call AI API:**\n```\nPOST /ai/stream\nBody: { messages, beneficiaryId }\n```",
"x": 500,
"y": 1000,
"connections": [
{ "to": "step-022" }
]
},
{
"id": "step-022",
"type": "card",
"title": "AI Backend: Process",
"borderColor": "green",
"tags": ["External", "API"],
"description": "**Server processes request:**\n\n1. Validate JWT token\n2. Get beneficiary context\n3. Call OpenAI/OpenRouter API\n4. Stream response chunks\n\n**Response:**\n```\ndata: {\"delta\":\"Hello\"}\ndata: {\"delta\":\"! How\"}\ndata: {\"delta\":\" can I\"}\ndata: {\"delta\":\" help?\"}\n[DONE]\n```",
"x": 900,
"y": 1000,
"connections": [
{ "to": "step-023" },
{ "to": "err-004" }
]
},
{
"id": "err-004",
"type": "card",
"title": "ERROR: AI API Failed",
"borderColor": "red",
"tags": ["Error"],
"description": "**When:**\n- Network error\n- API rate limit\n- Invalid token\n- Server error (500)\n\n**App shows:**\n```\n\"Sorry, I couldn't process your \nrequest. Please try again.\"\n```\n\n**TTS:** Speaks error message",
"x": 900,
"y": 1200,
"connections": []
},
{
"id": "step-023",
"type": "card",
"title": "App: Receive AI Response",
"borderColor": "blue",
"tags": ["App"],
"description": "**Stream handling:**\n```javascript\nfor await (const chunk of stream) {\n setMessages(prev => {\n // Append chunk to last message\n const updated = [...prev];\n updated[updated.length-1]\n .content += chunk;\n return updated;\n });\n}\n```\n\n**On complete:** Trigger TTS",
"x": 1300,
"y": 1000,
"connections": [
{ "to": "step-030" }
]
},
{
"id": "step-030",
"type": "card",
"title": "App: speakText(response)",
"borderColor": "blue",
"tags": ["App"],
"description": "**Auto-speak AI response:**\n```javascript\nconst speakText = async (text) => {\n if (!ttsInitialized) {\n // Fallback to expo-speech\n ExpoSpeech.speak(text);\n return;\n }\n \n setIsSpeaking(true);\n await sherpaTTS.speak(text, {\n speed: 1.0,\n onDone: () => setIsSpeaking(false)\n });\n};\n```",
"x": 100,
"y": 1400,
"connections": [
{ "to": "step-031" }
]
},
{
"id": "step-031",
"type": "card",
"title": "SherpaTTS: Generate Audio",
"borderColor": "purple",
"tags": ["Native"],
"description": "**Native TTS processing:**\n\n1. Text → phonemes (espeak-ng)\n2. Phonemes → audio (Piper VITS)\n3. Audio → device speaker\n\n**Parameters:**\n```javascript\nTTSManager.generateAndPlay(\n text,\n speakerId: 0,\n speed: 1.0\n);\n```\n\n**Model:** ~20MB neural network",
"x": 500,
"y": 1400,
"connections": [
{ "to": "step-032" }
]
},
{
"id": "step-032",
"type": "card",
"title": "UI: Speaking State",
"borderColor": "blue",
"tags": ["Screen"],
"description": "**Visual indicators:**\n\n1. **Status bar:**\n ```\n 🟢 Speaking... [⏹ Stop]\n ```\n\n2. **Stop button:**\n - Red stop circle icon\n - Tapping interrupts speech\n\n3. **Mic button:**\n - Disabled while speaking\n - Prevents overlap",
"x": 900,
"y": 1400,
"connections": [
{ "to": "step-033" },
{ "to": "step-040" }
]
},
{
"id": "step-033",
"type": "card",
"title": "TTS: Playback Complete",
"borderColor": "blue",
"tags": ["App"],
"description": "**On done callback:**\n```javascript\nonDone: () => {\n setIsSpeaking(false);\n}\n```\n\n**State reset:**\n```\nisSpeaking: false\n```\n\n**User can:**\n- Start new voice input\n- Type manually\n- Scroll chat history",
"x": 1300,
"y": 1400,
"connections": []
},
{
"id": "step-040",
"type": "card",
"title": "User: Tap Stop",
"borderColor": "red",
"tags": ["User"],
"description": "**User interrupts speech:**\n\nTaps stop button (⏹) to cancel TTS playback immediately.\n\n**Use cases:**\n- Response too long\n- User wants to ask follow-up\n- Wrong response",
"x": 900,
"y": 1600,
"connections": [
{ "to": "step-041" }
]
},
{
"id": "step-041",
"type": "card",
"title": "App: stopSpeaking()",
"borderColor": "blue",
"tags": ["App"],
"description": "**Stop playback:**\n```javascript\nconst stopSpeaking = () => {\n if (ttsInitialized) {\n sherpaTTS.stop();\n } else {\n ExpoSpeech.stop();\n }\n setIsSpeaking(false);\n};\n```\n\n**Immediate effect:**\n- Audio stops\n- UI returns to idle",
"x": 1300,
"y": 1600,
"connections": []
},
{
"id": "state-machine",
"type": "card",
"title": "STATE MACHINE: Voice",
"borderColor": "gray",
"tags": ["Reference"],
"description": "```\n ┌─────────────┐\n │ IDLE │\n │ isListening:│\n │ false │\n │ isSpeaking: │\n │ false │\n └──────┬──────┘\n │ tap mic\n ┌──────▼──────┐\n │ LISTENING │\n │ isListening:│\n │ true │\n │ (pulsing) │\n └──────┬──────┘\n │ stop/send\n ┌──────▼──────┐\n │ PROCESSING │\n │ isSending: │\n │ true │\n └──────┬──────┘\n │ AI responds\n ┌──────▼──────┐\n │ SPEAKING │\n │ isSpeaking: │\n │ true │\n └──────┬──────┘\n │ done/stop\n ┌──────▼──────┐\n │ IDLE │\n └─────────────┘\n```",
"x": 50,
"y": 1800,
"connections": []
},
{
"id": "files-ref",
"type": "card",
"title": "FILES: Voice Integration",
"borderColor": "gray",
"tags": ["Reference"],
"description": "**Modified files:**\n\n📄 `package.json`\n- expo-speech\n- expo-speech-recognition\n- react-native-sherpa-onnx-offline-tts\n\n📄 `services/sherpaTTS.ts`\n- Initialize, speak, stop\n- Voice selection\n- Native bridge\n\n📄 `hooks/useSpeechRecognition.ts`\n- Start/stop listening\n- Event handlers\n- Permission request\n\n📄 `app/(tabs)/chat.tsx`\n- Voice states\n- UI integration\n- Handlers",
"x": 500,
"y": 1800,
"connections": []
},
{
"id": "voices-ref",
"type": "card",
"title": "VOICES: Piper Models",
"borderColor": "gray",
"tags": ["Reference"],
"description": "**Available neural voices:**\n\n| Voice | Gender | Accent | Quality |\n|-------|--------|--------|--------|\n| Lessac | Female | US | Natural |\n| Ryan | Male | US | Natural |\n| Alba | Female | UK | Clear |\n\n**Model size:** ~20MB each\n\n**Audio:** 22kHz mono\n\n**Location:**\n```\nassets/tts-models/\n vits-piper-en_US-lessac-medium/\n vits-piper-en_US-ryan-medium/\n vits-piper-en_GB-alba-medium/\n```",
"x": 900,
"y": 1800,
"connections": []
},
{
"id": "build-ref",
"type": "card",
"title": "BUILD REQUIREMENTS",
"borderColor": "orange",
"tags": ["Reference"],
"description": "**Native build required!**\n\n⚠️ Will NOT work in Expo Go\n\n**Steps:**\n1. `npm install`\n2. `npx expo prebuild --clean`\n3. `npx expo run:ios`\n4. Test on simulator/device\n\n**iOS:** Native modules bridged\n**Android:** JNI/Kotlin bindings\n\n**Permissions:**\n- iOS: `NSMicrophoneUsageDescription`\n- Android: `RECORD_AUDIO`",
"x": 1300,
"y": 1800,
"connections": []
}
]
}