app.py

#!/usr/bin/env python3
"""
ZW Kitten - Production FastAPI interface for KittenTTS
"""
import os
import tempfile
from fastapi import FastAPI, Request
from fastapi.responses import HTMLResponse, FileResponse, JSONResponse
import uvicorn
import numpy as np
import wave


# Import KittenTTS directly without demo fallback
from get_model import KittenTTS
from onnx_model import KittenTTS_1_Onnx

# Fixed version without arbitrary audio trimming
class FixedKittenTTS_1_Onnx(KittenTTS_1_Onnx):
    """Fixed version without arbitrary audio trimming"""
    
    def generate(self, text: str, voice: str = "expr-voice-5-m", speed: float = 1.0) -> np.ndarray:
        """Generate without the truncation bug"""
        onnx_inputs = self._prepare_inputs(text, voice, speed)
        outputs = self.session.run(None, onnx_inputs)
        
        # FIXED: No arbitrary trimming - return full audio
        audio = outputs[0]
        return audio

class FixedKittenTTS:
    """KittenTTS with truncation bug fixed"""
    
    def __init__(self):
        self.kitten = KittenTTS()
        # Apply the fix
        self.kitten.model.generate = FixedKittenTTS_1_Onnx.generate.__get__(
            self.kitten.model, KittenTTS_1_Onnx
        )
    
    def generate(self, text, voice="expr-voice-2-m", speed=1.0):
        return self.kitten.generate(text, voice=voice, speed=speed)

app = FastAPI(title="ZW Kitten TTS")

# Initialize TTS
tts = FixedKittenTTS()
print("✅ Fixed KittenTTS initialized (no truncation bug)")

@app.post("/generate")
async def generate_speech(request: Request):
    """Generate speech from text"""
    data = await request.json()
    
    text = data.get('text', '').strip()
    character = data.get('character', 'claude')
    emotion = data.get('emotion', 'neutral')
    
    if not text:
        return JSONResponse({"error": "No text provided"}, status_code=400)
    
    # Character to voice mapping
    voice_map = {
        'claude': 'expr-voice-2-m',
        'keen': 'expr-voice-2-f', 
        'tran': 'expr-voice-3-m',
        'isla': 'expr-voice-4-f',
        'system': 'expr-voice-5-m',
        'narrator': 'expr-voice-5-f'
    }
    
    # Emotion to speed mapping
    speed_map = {
        'neutral': 1.0,
        'cosmic_awareness': 0.8,
        'determined': 1.1,
        'whisper': 0.9,
        'urgent': 1.2,
        'calm': 0.9
    }
    
    voice = voice_map.get(character, 'expr-voice-2-m')
    speed = speed_map.get(emotion, 1.0)
    
    try:
        # Generate real audio with KittenTTS
        audio = tts.generate(text, voice=voice, speed=speed)
        
        # Save to temporary WAV (mono, 16-bit PCM)
        temp_file = tempfile.NamedTemporaryFile(suffix=".wav", delete=False)

        a = np.asarray(audio, dtype=np.float32)
        # if model returns [N,1], flatten it:
        if a.ndim > 1:
            a = a[:, 0]
        a = np.clip(a, -1.0, 1.0)
        a_i16 = (a * 32767.0).astype(np.int16)

        with wave.open(temp_file.name, "wb") as w:
            w.setnchannels(1)       # mono
            w.setsampwidth(2)       # 16-bit
            w.setframerate(24000)   # Hz (use your model's sr if different)
            w.writeframes(a_i16.tobytes())

        
        return JSONResponse({
            "success": True,
            "audio_url": f"/audio/{os.path.basename(temp_file.name)}",
            "zw_block": f"""!zw/dialogue.intent:
  character: {character}
  emotion: {emotion}
  line: {text}""",
            "info": f"""🎭 Character: {character.title()}
😊 Emotion: {emotion.replace('_', ' ').title()} (speed: {speed:.1f}x)
🎵 Voice: {voice}
📝 Text: "{text}"

✅ Audio generated successfully!"""
        })
            
    except Exception as e:
        return JSONResponse({"error": str(e)}, status_code=500)

@app.get("/audio/{filename}")
async def serve_audio(filename: str):
    """Serve generated audio files"""
    file_path = os.path.join(tempfile.gettempdir(), filename)
    if os.path.exists(file_path):
        return FileResponse(file_path, media_type="audio/wav")
    return JSONResponse({"error": "File not found"}, status_code=404)

@app.get("/", response_class=HTMLResponse)
def serve_interface():
    """Serve the web interface"""
    return """
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>🐱 ZW Kitten TTS</title>
    <style>
        /* ... (keep all your existing CSS styles) ... */
    </style>
</head>
<body>
    <div class="container">
        <div class="header">
            <h1>🐱 ZW Kitten</h1>
            <div class="subtitle">Text-to-Speech with Character Personalities</div>
        </div>
        
        <!-- ... (keep all your existing HTML structure) ... -->
        
        <div class="repo-link">
            <a href="https://github.com/SmokesBowls/zw-kitten-tts" target="_blank">
                📚 GitHub Repository
            </a>
        </div>
    </div>

    <script>
        // ... (keep all your existing JavaScript) ...
    </script>
</body>
</html>
"""

@app.get("/health")
def health_check():
    return {"status": "healthy"}

if __name__ == "__main__":
    port = int(os.environ.get("PORT", 7860))
    uvicorn.run(app, host="0.0.0.0", port=port)