app_lightweight.py

import os

# STORAGE OPTIMIZATION: Check if running on HF Spaces and disable model downloads
IS_HF_SPACE = any([
    os.getenv("SPACE_ID"),
    os.getenv("SPACE_AUTHOR_NAME"), 
    os.getenv("SPACES_BUILDKIT_VERSION"),
    "/home/user/app" in os.getcwd()
])

if IS_HF_SPACE:
    # Force TTS-only mode to prevent storage limit exceeded
    os.environ["DISABLE_MODEL_DOWNLOAD"] = "1"
    os.environ["TTS_ONLY_MODE"] = "1" 
    os.environ["HF_SPACE_STORAGE_OPTIMIZED"] = "1"
    print("?? STORAGE OPTIMIZATION: Detected HF Space environment")
    print("??? TTS-only mode ENABLED (video generation disabled for storage limits)")
    print("?? Model auto-download DISABLED to prevent storage exceeded error")
import os
import torch
import tempfile
import gradio as gr
from fastapi import FastAPI, HTTPException
from fastapi.staticfiles import StaticFiles
from fastapi.middleware.cors import CORSMiddleware
from pydantic import BaseModel, HttpUrl
import subprocess
import json
from pathlib import Path
import logging
import requests
from urllib.parse import urlparse
from PIL import Image
import io
from typing import Optional
import aiohttp
import asyncio
from dotenv import load_dotenv

# CRITICAL: HF Spaces compatibility fix
try:
    from hf_spaces_fix import setup_hf_spaces_environment, HFSpacesCompatible
    setup_hf_spaces_environment()
except ImportError:
    print('Warning: HF Spaces fix not available')

# Load environment variables
load_dotenv()

# Set up logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)

# Set environment variables for matplotlib, gradio, and huggingface cache
os.environ['MPLCONFIGDIR'] = '/tmp/matplotlib'
os.environ['GRADIO_ALLOW_FLAGGING'] = 'never'
os.environ['HF_HOME'] = '/tmp/huggingface'
# Use HF_HOME instead of deprecated TRANSFORMERS_CACHE
os.environ['HF_DATASETS_CACHE'] = '/tmp/huggingface/datasets'
os.environ['HUGGINGFACE_HUB_CACHE'] = '/tmp/huggingface/hub'

# FastAPI app will be created after lifespan is defined



# Create directories with proper permissions
os.makedirs("outputs", exist_ok=True)
os.makedirs("/tmp/matplotlib", exist_ok=True)
os.makedirs("/tmp/huggingface", exist_ok=True)
os.makedirs("/tmp/huggingface/transformers", exist_ok=True)
os.makedirs("/tmp/huggingface/datasets", exist_ok=True)
os.makedirs("/tmp/huggingface/hub", exist_ok=True)

# Mount static files for serving generated videos  


def get_video_url(output_path: str) -> str:
    """Convert local file path to accessible URL"""
    try:
        from pathlib import Path
        filename = Path(output_path).name
        
        # For HuggingFace Spaces, construct the URL
        base_url = "https://bravedims-ai-avatar-chat.hf.space"
        video_url = f"{base_url}/outputs/{filename}"
        logger.info(f"Generated video URL: {video_url}")
        return video_url
    except Exception as e:
        logger.error(f"Error creating video URL: {e}")
        return output_path  # Fallback to original path

# Pydantic models for request/response
class GenerateRequest(BaseModel):
    prompt: str
    text_to_speech: Optional[str] = None  # Text to convert to speech
    audio_url: Optional[HttpUrl] = None  # Direct audio URL
    voice_id: Optional[str] = "21m00Tcm4TlvDq8ikWAM"  # Voice profile ID
    image_url: Optional[HttpUrl] = None
    guidance_scale: float = 5.0
    audio_scale: float = 3.0
    num_steps: int = 30
    sp_size: int = 1
    tea_cache_l1_thresh: Optional[float] = None

class GenerateResponse(BaseModel):
    message: str
    output_path: str
    processing_time: float
    audio_generated: bool = False
    tts_method: Optional[str] = None

# Try to import TTS clients, but make them optional
try:
    from advanced_tts_client import AdvancedTTSClient
    ADVANCED_TTS_AVAILABLE = True
    logger.info("SUCCESS: Advanced TTS client available")
except ImportError as e:
    ADVANCED_TTS_AVAILABLE = False
    logger.warning(f"WARNING: Advanced TTS client not available: {e}")

# Always import the robust fallback
try:
    from robust_tts_client import RobustTTSClient
    ROBUST_TTS_AVAILABLE = True
    logger.info("SUCCESS: Robust TTS client available")
except ImportError as e:
    ROBUST_TTS_AVAILABLE = False
    logger.error(f"ERROR: Robust TTS client not available: {e}")

class TTSManager:
    """Manages multiple TTS clients with fallback chain"""
    
    def __init__(self):
        # Initialize TTS clients based on availability
        self.advanced_tts = None
        self.robust_tts = None
        self.clients_loaded = False
        
        if ADVANCED_TTS_AVAILABLE:
            try:
                self.advanced_tts = AdvancedTTSClient()
                logger.info("SUCCESS: Advanced TTS client initialized")
            except Exception as e:
                logger.warning(f"WARNING: Advanced TTS client initialization failed: {e}")
        
        if ROBUST_TTS_AVAILABLE:
            try:
                self.robust_tts = RobustTTSClient()
                logger.info("SUCCESS: Robust TTS client initialized")
            except Exception as e:
                logger.error(f"ERROR: Robust TTS client initialization failed: {e}")
        
        if not self.advanced_tts and not self.robust_tts:
            logger.error("ERROR: No TTS clients available!")
        
    async def load_models(self):
        """Load TTS models"""
        try:
            logger.info("Loading TTS models...")
            
            # Try to load advanced TTS first
            if self.advanced_tts:
                try:
                    logger.info("[PROCESS] Loading advanced TTS models (this may take a few minutes)...")
                    success = await self.advanced_tts.load_models()
                    if success:
                        logger.info("SUCCESS: Advanced TTS models loaded successfully")
                    else:
                        logger.warning("WARNING: Advanced TTS models failed to load")
                except Exception as e:
                    logger.warning(f"WARNING: Advanced TTS loading error: {e}")
            
            # Always ensure robust TTS is available
            if self.robust_tts:
                try:
                    await self.robust_tts.load_model()
                    logger.info("SUCCESS: Robust TTS fallback ready")
                except Exception as e:
                    logger.error(f"ERROR: Robust TTS loading failed: {e}")
            
            self.clients_loaded = True
            return True
            
        except Exception as e:
            logger.error(f"ERROR: TTS manager initialization failed: {e}")
            return False
    
    async def text_to_speech(self, text: str, voice_id: Optional[str] = None) -> tuple[str, str]:
        """
        Convert text to speech with fallback chain
        Returns: (audio_file_path, method_used)
        """
        if not self.clients_loaded:
            logger.info("TTS models not loaded, loading now...")
            await self.load_models()
        
        logger.info(f"Generating speech: {text[:50]}...")
        logger.info(f"Voice ID: {voice_id}")
        
        # Try Advanced TTS first (Facebook VITS / SpeechT5)
        if self.advanced_tts:
            try:
                audio_path = await self.advanced_tts.text_to_speech(text, voice_id)
                return audio_path, "Facebook VITS/SpeechT5"
            except Exception as advanced_error:
                logger.warning(f"Advanced TTS failed: {advanced_error}")
        
        # Fall back to robust TTS
        if self.robust_tts:
            try:
                logger.info("Falling back to robust TTS...")
                audio_path = await self.robust_tts.text_to_speech(text, voice_id)
                return audio_path, "Robust TTS (Fallback)"
            except Exception as robust_error:
                logger.error(f"Robust TTS also failed: {robust_error}")
        
        # If we get here, all methods failed
        logger.error("All TTS methods failed!")
        raise HTTPException(
            status_code=500, 
            detail="All TTS methods failed. Please check system configuration."
        )
    
    async def get_available_voices(self):
        """Get available voice configurations"""
        try:
            if self.advanced_tts and hasattr(self.advanced_tts, 'get_available_voices'):
                return await self.advanced_tts.get_available_voices()
        except:
            pass
        
        # Return default voices if advanced TTS not available
        return {
            "21m00Tcm4TlvDq8ikWAM": "Female (Neutral)",
            "pNInz6obpgDQGcFmaJgB": "Male (Professional)", 
            "EXAVITQu4vr4xnSDxMaL": "Female (Sweet)",
            "ErXwobaYiN019PkySvjV": "Male (Professional)",
            "TxGEqnHWrfGW9XjX": "Male (Deep)",
            "yoZ06aMxZJJ28mfd3POQ": "Unisex (Friendly)",
            "AZnzlk1XvdvUeBnXmlld": "Female (Strong)"
        }
    
    def get_tts_info(self):
        """Get TTS system information"""
        info = {
            "clients_loaded": self.clients_loaded,
            "advanced_tts_available": self.advanced_tts is not None,
            "robust_tts_available": self.robust_tts is not None,
            "primary_method": "Robust TTS"
        }
        
        try:
            if self.advanced_tts and hasattr(self.advanced_tts, 'get_model_info'):
                advanced_info = self.advanced_tts.get_model_info()
                info.update({
                    "advanced_tts_loaded": advanced_info.get("models_loaded", False),
                    "transformers_available": advanced_info.get("transformers_available", False),
                    "primary_method": "Facebook VITS/SpeechT5" if advanced_info.get("models_loaded") else "Robust TTS",
                    "device": advanced_info.get("device", "cpu"),
                    "vits_available": advanced_info.get("vits_available", False),
                    "speecht5_available": advanced_info.get("speecht5_available", False)
                })
        except Exception as e:
            logger.debug(f"Could not get advanced TTS info: {e}")
        
        return info

# Import the VIDEO-FOCUSED engine
try:
    from omniavatar_video_engine import video_engine
    VIDEO_ENGINE_AVAILABLE = True
    logger.info("SUCCESS: OmniAvatar Video Engine available")
except ImportError as e:
    VIDEO_ENGINE_AVAILABLE = False
    logger.error(f"ERROR: OmniAvatar Video Engine not available: {e}")

class OmniAvatarAPI:
    def __init__(self):
        self.model_loaded = False
        self.device = "cuda" if torch.cuda.is_available() else "cpu"
        self.tts_manager = TTSManager()
        logger.info(f"Using device: {self.device}")
        logger.info("Initialized with robust TTS system")
        
    def load_model(self):
        """Load the OmniAvatar model - now more flexible"""
        try:
            # Check if models are downloaded (but don't require them)
            model_paths = [
                "./pretrained_models/Wan2.1-T2V-14B",
                "./pretrained_models/OmniAvatar-14B", 
                "./pretrained_models/wav2vec2-base-960h"
            ]
            
            missing_models = []
            for path in model_paths:
                if not os.path.exists(path):
                    missing_models.append(path)
            
            if missing_models:
                logger.warning("WARNING: Some OmniAvatar models not found:")
                for model in missing_models:
                    logger.warning(f"   - {model}")
                logger.info("TIP: App will run in TTS-only mode (no video generation)")
                logger.info("TIP: To enable full avatar generation, download the required models")
                
                # Set as loaded but in limited mode
                self.model_loaded = False  # Video generation disabled
                return True  # But app can still run
            else:
                self.model_loaded = True
                logger.info("SUCCESS: All OmniAvatar models found - full functionality enabled")
                return True
                
        except Exception as e:
            logger.error(f"Error checking models: {str(e)}")
            logger.info("TIP: Continuing in TTS-only mode")
            self.model_loaded = False
            return True  # Continue running
    
    async def download_file(self, url: str, suffix: str = "") -> str:
        """Download file from URL and save to temporary location"""
        try:
            async with aiohttp.ClientSession() as session:
                async with session.get(str(url)) as response:
                    if response.status != 200:
                        raise HTTPException(status_code=400, detail=f"Failed to download file from URL: {url}")
                    
                    content = await response.read()
                    
                    # Create temporary file
                    temp_file = tempfile.NamedTemporaryFile(delete=False, suffix=suffix)
                    temp_file.write(content)
                    temp_file.close()
                    
                    return temp_file.name
                    
        except aiohttp.ClientError as e:
            logger.error(f"Network error downloading {url}: {e}")
            raise HTTPException(status_code=400, detail=f"Network error downloading file: {e}")
        except Exception as e:
            logger.error(f"Error downloading file from {url}: {e}")
            raise HTTPException(status_code=500, detail=f"Error downloading file: {e}")
    
    def validate_audio_url(self, url: str) -> bool:
        """Validate if URL is likely an audio file"""
        try:
            parsed = urlparse(url)
            # Check for common audio file extensions
            audio_extensions = ['.mp3', '.wav', '.m4a', '.ogg', '.aac', '.flac']
            is_audio_ext = any(parsed.path.lower().endswith(ext) for ext in audio_extensions)
            
            return is_audio_ext or 'audio' in url.lower()
        except:
            return False
    
    def validate_image_url(self, url: str) -> bool:
        """Validate if URL is likely an image file"""
        try:
            parsed = urlparse(url)
            image_extensions = ['.jpg', '.jpeg', '.png', '.webp', '.bmp', '.gif']
            return any(parsed.path.lower().endswith(ext) for ext in image_extensions)
        except:
            return False
    
    async def generate_avatar(self, request: GenerateRequest) -> tuple[str, float, bool, str]:
        """Generate avatar VIDEO - PRIMARY FUNCTIONALITY"""
        import time
        start_time = time.time()
        audio_generated = False
        method_used = "Unknown"
        
        logger.info("[VIDEO] STARTING AVATAR VIDEO GENERATION")
        logger.info(f"[INFO] Prompt: {request.prompt}")
        
        if VIDEO_ENGINE_AVAILABLE:
            try:
                # PRIORITIZE VIDEO GENERATION
                logger.info("[TARGET] Using OmniAvatar Video Engine for FULL video generation")
                
                # Handle audio source
                audio_path = None
                if request.text_to_speech:
                    logger.info("[MIC] Generating audio from text...")
                    audio_path, method_used = await self.tts_manager.text_to_speech(
                        request.text_to_speech, 
                        request.voice_id or "21m00Tcm4TlvDq8ikWAM"
                    )
                    audio_generated = True
                elif request.audio_url:
                    logger.info("📥 Downloading audio from URL...")
                    audio_path = await self.download_file(str(request.audio_url), ".mp3")
                    method_used = "External Audio"
                else:
                    raise HTTPException(status_code=400, detail="Either text_to_speech or audio_url required for video generation")
                
                # Handle image if provided
                image_path = None
                if request.image_url:
                    logger.info("[IMAGE] Downloading reference image...")
                    parsed = urlparse(str(request.image_url))
                    ext = os.path.splitext(parsed.path)[1] or ".jpg"
                    image_path = await self.download_file(str(request.image_url), ext)
                
                # GENERATE VIDEO using OmniAvatar engine
                logger.info("[VIDEO] Generating avatar video with adaptive body animation...")
                video_path, generation_time = video_engine.generate_avatar_video(
                    prompt=request.prompt,
                    audio_path=audio_path,
                    image_path=image_path,
                    guidance_scale=request.guidance_scale,
                    audio_scale=request.audio_scale,
                    num_steps=request.num_steps
                )
                
                processing_time = time.time() - start_time
                logger.info(f"SUCCESS: VIDEO GENERATED successfully in {processing_time:.1f}s")
                
                # Cleanup temporary files
                if audio_path and os.path.exists(audio_path):
                    os.unlink(audio_path)
                if image_path and os.path.exists(image_path):
                    os.unlink(image_path)
                
                return video_path, processing_time, audio_generated, f"OmniAvatar Video Generation ({method_used})"
                
            except Exception as e:
                logger.error(f"ERROR: Video generation failed: {e}")
                # For a VIDEO generation app, we should NOT fall back to audio-only
                # Instead, provide clear guidance
                if "models" in str(e).lower():
                    raise HTTPException(
                        status_code=503,
                        detail=f"Video generation requires OmniAvatar models (~30GB). Please run model download script. Error: {str(e)}"
                    )
                else:
                    raise HTTPException(status_code=500, detail=f"Video generation failed: {str(e)}")
        
        # If video engine not available, this is a critical error for a VIDEO app
        raise HTTPException(
            status_code=503, 
            detail="Video generation engine not available. This application requires OmniAvatar models for video generation."
        )

    async def generate_avatar_BACKUP(self, request: GenerateRequest) -> tuple[str, float, bool, str]:
        """OLD TTS-ONLY METHOD - kept as backup reference.
        Generate avatar video from prompt and audio/text - now handles missing models"""
        import time
        start_time = time.time()
        audio_generated = False
        tts_method = None
        
        try:
            # Check if video generation is available
            if not self.model_loaded:
                logger.info("🎙️ Running in TTS-only mode (OmniAvatar models not available)")
                
                # Only generate audio, no video
                if request.text_to_speech:
                    logger.info(f"Generating speech from text: {request.text_to_speech[:50]}...")
                    audio_path, tts_method = await self.tts_manager.text_to_speech(
                        request.text_to_speech, 
                        request.voice_id or "21m00Tcm4TlvDq8ikWAM"
                    )
                    
                    # Return the audio file as the "output"
                    processing_time = time.time() - start_time
                    logger.info(f"SUCCESS: TTS completed in {processing_time:.1f}s using {tts_method}")
                    return audio_path, processing_time, True, f"{tts_method} (TTS-only mode)"
                else:
                    raise HTTPException(
                        status_code=503,
                        detail="Video generation unavailable. OmniAvatar models not found. Only TTS from text is supported."
                    )
            
            # Original video generation logic (when models are available)
            # Determine audio source
            audio_path = None
            
            if request.text_to_speech:
                # Generate speech from text using TTS manager
                logger.info(f"Generating speech from text: {request.text_to_speech[:50]}...")
                audio_path, tts_method = await self.tts_manager.text_to_speech(
                    request.text_to_speech, 
                    request.voice_id or "21m00Tcm4TlvDq8ikWAM"
                )
                audio_generated = True
                
            elif request.audio_url:
                # Download audio from provided URL
                logger.info(f"Downloading audio from URL: {request.audio_url}")
                if not self.validate_audio_url(str(request.audio_url)):
                    logger.warning(f"Audio URL may not be valid: {request.audio_url}")
                
                audio_path = await self.download_file(str(request.audio_url), ".mp3")
                tts_method = "External Audio URL"
            
            else:
                raise HTTPException(
                    status_code=400, 
                    detail="Either text_to_speech or audio_url must be provided"
                )
            
            # Download image if provided
            image_path = None
            if request.image_url:
                logger.info(f"Downloading image from URL: {request.image_url}")
                if not self.validate_image_url(str(request.image_url)):
                    logger.warning(f"Image URL may not be valid: {request.image_url}")
                
                # Determine image extension from URL or default to .jpg
                parsed = urlparse(str(request.image_url))
                ext = os.path.splitext(parsed.path)[1] or ".jpg"
                image_path = await self.download_file(str(request.image_url), ext)
            
            # Create temporary input file for inference
            with tempfile.NamedTemporaryFile(mode='w', suffix='.txt', delete=False) as f:
                if image_path:
                    input_line = f"{request.prompt}@@{image_path}@@{audio_path}"
                else:
                    input_line = f"{request.prompt}@@@@{audio_path}"
                f.write(input_line)
                temp_input_file = f.name
            
            # Prepare inference command
            cmd = [
                "python", "-m", "torch.distributed.run",
                "--standalone", f"--nproc_per_node={request.sp_size}",
                "scripts/inference.py",
                "--config", "configs/inference.yaml",
                "--input_file", temp_input_file,
                "--guidance_scale", str(request.guidance_scale),
                "--audio_scale", str(request.audio_scale),
                "--num_steps", str(request.num_steps)
            ]
            
            if request.tea_cache_l1_thresh:
                cmd.extend(["--tea_cache_l1_thresh", str(request.tea_cache_l1_thresh)])
            
            logger.info(f"Running inference with command: {' '.join(cmd)}")
            
            # Run inference
            result = subprocess.run(cmd, capture_output=True, text=True)
            
            # Clean up temporary files
            os.unlink(temp_input_file)
            os.unlink(audio_path)
            if image_path:
                os.unlink(image_path)
            
            if result.returncode != 0:
                logger.error(f"Inference failed: {result.stderr}")
                raise Exception(f"Inference failed: {result.stderr}")
            
            # Find output video file
            output_dir = "./outputs"
            if os.path.exists(output_dir):
                video_files = [f for f in os.listdir(output_dir) if f.endswith(('.mp4', '.avi'))]
                if video_files:
                    # Return the most recent video file
                    video_files.sort(key=lambda x: os.path.getmtime(os.path.join(output_dir, x)), reverse=True)
                    output_path = os.path.join(output_dir, video_files[0])
                    processing_time = time.time() - start_time
                    return output_path, processing_time, audio_generated, tts_method
            
            raise Exception("No output video generated")
            
        except Exception as e:
            # Clean up any temporary files in case of error
            try:
                if 'audio_path' in locals() and audio_path and os.path.exists(audio_path):
                    os.unlink(audio_path)
                if 'image_path' in locals() and image_path and os.path.exists(image_path):
                    os.unlink(image_path)
                if 'temp_input_file' in locals() and os.path.exists(temp_input_file):
                    os.unlink(temp_input_file)
            except:
                pass
            
            logger.error(f"Generation error: {str(e)}")
            raise HTTPException(status_code=500, detail=str(e))

# Initialize API
omni_api = OmniAvatarAPI()

# Use FastAPI lifespan instead of deprecated on_event
from contextlib import asynccontextmanager

@asynccontextmanager
async def lifespan(app: FastAPI):
    # Startup
    success = omni_api.load_model()
    if not success:
        logger.warning("WARNING: OmniAvatar model loading failed - running in limited mode")
    
    # Load TTS models
    try:
        await omni_api.tts_manager.load_models()
        logger.info("SUCCESS: TTS models initialization completed")
    except Exception as e:
        logger.error(f"ERROR: TTS initialization failed: {e}")
    
    yield
    
    # Shutdown (if needed)
    logger.info("Application shutting down...")

# Create FastAPI app WITH lifespan parameter
app = FastAPI(
    title="OmniAvatar-14B API with Advanced TTS", 
    version="1.0.0",
    lifespan=lifespan
)

# Add CORS middleware
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

# Mount static files for serving generated videos
app.mount("/outputs", StaticFiles(directory="outputs"), name="outputs")

@app.get("/health")
async def health_check():
    """Health check endpoint"""
    tts_info = omni_api.tts_manager.get_tts_info()
    
    return {
        "status": "healthy",
        "model_loaded": omni_api.model_loaded,
        "video_generation_available": omni_api.model_loaded,
        "tts_only_mode": not omni_api.model_loaded,
        "device": omni_api.device,
        "supports_text_to_speech": True,
        "supports_image_urls": omni_api.model_loaded,
        "supports_audio_urls": omni_api.model_loaded,
        "tts_system": "Advanced TTS with Robust Fallback",
        "advanced_tts_available": ADVANCED_TTS_AVAILABLE,
        "robust_tts_available": ROBUST_TTS_AVAILABLE,
        **tts_info
    }

@app.get("/voices")
async def get_voices():
    """Get available voice configurations"""
    try:
        voices = await omni_api.tts_manager.get_available_voices()
        return {"voices": voices}
    except Exception as e:
        logger.error(f"Error getting voices: {e}")
        return {"error": str(e)}

@app.post("/generate", response_model=GenerateResponse)
async def generate_avatar(request: GenerateRequest):
    """Generate avatar video from prompt, text/audio, and optional image URL"""
    
    logger.info(f"Generating avatar with prompt: {request.prompt}")
    if request.text_to_speech:
        logger.info(f"Text to speech: {request.text_to_speech[:100]}...")
        logger.info(f"Voice ID: {request.voice_id}")
    if request.audio_url:
        logger.info(f"Audio URL: {request.audio_url}")
    if request.image_url:
        logger.info(f"Image URL: {request.image_url}")
    
    try:
        output_path, processing_time, audio_generated, tts_method = await omni_api.generate_avatar(request)
        
        return GenerateResponse(
            message="Generation completed successfully" + (" (TTS-only mode)" if not omni_api.model_loaded else ""),
            output_path=get_video_url(output_path) if omni_api.model_loaded else output_path,
            processing_time=processing_time,
            audio_generated=audio_generated,
            tts_method=tts_method
        )
        
    except HTTPException:
        raise
    except Exception as e:
        logger.error(f"Unexpected error: {e}")
        raise HTTPException(status_code=500, detail=f"Unexpected error: {e}")

# Enhanced Gradio interface
def gradio_generate(prompt, text_to_speech, audio_url, image_url, voice_id, guidance_scale, audio_scale, num_steps):
    """Gradio interface wrapper with robust TTS support"""
    try:
        # Create request object
        request_data = {
            "prompt": prompt,
            "guidance_scale": guidance_scale,
            "audio_scale": audio_scale,
            "num_steps": int(num_steps)
        }
        
        # Add audio source
        if text_to_speech and text_to_speech.strip():
            request_data["text_to_speech"] = text_to_speech
            request_data["voice_id"] = voice_id or "21m00Tcm4TlvDq8ikWAM"
        elif audio_url and audio_url.strip():
            if omni_api.model_loaded:
                request_data["audio_url"] = audio_url
            else:
                return "Error: Audio URL input requires full OmniAvatar models. Please use text-to-speech instead."
        else:
            return "Error: Please provide either text to speech or audio URL"
        
        if image_url and image_url.strip():
            if omni_api.model_loaded:
                request_data["image_url"] = image_url
            else:
                return "Error: Image URL input requires full OmniAvatar models for video generation."
        
        request = GenerateRequest(**request_data)
        
        # Run async function in sync context
        loop = asyncio.new_event_loop()
        asyncio.set_event_loop(loop)
        output_path, processing_time, audio_generated, tts_method = loop.run_until_complete(omni_api.generate_avatar(request))
        loop.close()
        
        success_message = f"SUCCESS: Generation completed in {processing_time:.1f}s using {tts_method}"
        print(success_message)
        
        if omni_api.model_loaded:
            return output_path
        else:
            return f"🎙️ TTS Audio generated successfully using {tts_method}\nFile: {output_path}\n\nWARNING: Video generation unavailable (OmniAvatar models not found)"
        
    except Exception as e:
        logger.error(f"Gradio generation error: {e}")
        return f"Error: {str(e)}"

# Create Gradio interface
mode_info = " (TTS-Only Mode)" if not omni_api.model_loaded else ""
description_extra = """
WARNING: Running in TTS-Only Mode - OmniAvatar models not found. Only text-to-speech generation is available.
To enable full video generation, the required model files need to be downloaded.
""" if not omni_api.model_loaded else ""

iface = gr.Interface(
    fn=gradio_generate,
    inputs=[
        gr.Textbox(
            label="Prompt", 
            placeholder="Describe the character behavior (e.g., 'A friendly person explaining a concept')",
            lines=2
        ),
        gr.Textbox(
            label="Text to Speech", 
            placeholder="Enter text to convert to speech",
            lines=3,
            info="Will use best available TTS system (Advanced or Fallback)"
        ),
        gr.Textbox(
            label="OR Audio URL", 
            placeholder="https://example.com/audio.mp3",
            info="Direct URL to audio file (requires full models)" if not omni_api.model_loaded else "Direct URL to audio file"
        ),
        gr.Textbox(
            label="Image URL (Optional)", 
            placeholder="https://example.com/image.jpg",
            info="Direct URL to reference image (requires full models)" if not omni_api.model_loaded else "Direct URL to reference image"
        ),
        gr.Dropdown(
            choices=[
                "21m00Tcm4TlvDq8ikWAM", 
                "pNInz6obpgDQGcFmaJgB", 
                "EXAVITQu4vr4xnSDxMaL",
                "ErXwobaYiN019PkySvjV",
                "TxGEqnHWrfGW9XjX",
                "yoZ06aMxZJJ28mfd3POQ",
                "AZnzlk1XvdvUeBnXmlld"
            ],
            value="21m00Tcm4TlvDq8ikWAM",
            label="Voice Profile",
            info="Choose voice characteristics for TTS generation"
        ),
        gr.Slider(minimum=1, maximum=10, value=5.0, label="Guidance Scale", info="4-6 recommended"),
        gr.Slider(minimum=1, maximum=10, value=3.0, label="Audio Scale", info="Higher values = better lip-sync"),
        gr.Slider(minimum=10, maximum=100, value=30, step=1, label="Number of Steps", info="20-50 recommended")
    ],
    outputs=gr.Video(label="Generated Avatar Video") if omni_api.model_loaded else gr.Textbox(label="TTS Output"),
    title="[VIDEO] OmniAvatar-14B - Avatar Video Generation with Adaptive Body Animation",
    description=f"""
    Generate avatar videos with lip-sync from text prompts and speech using robust TTS system.
    
    {description_extra}
    
    **Robust TTS Architecture**
    - **Primary**: Advanced TTS (Facebook VITS & SpeechT5) if available
    - **Fallback**: Robust tone generation for 100% reliability
    - **Automatic**: Seamless switching between methods
    
    **Features:**
    - **Guaranteed Generation**: Always produces audio output
    - **No Dependencies**: Works even without advanced models
    - **High Availability**: Multiple fallback layers
    - **Voice Profiles**: Multiple voice characteristics
    - **Audio URL Support**: Use external audio files {"(full models required)" if not omni_api.model_loaded else ""}
    - **Image URL Support**: Reference images for characters {"(full models required)" if not omni_api.model_loaded else ""}
    
    **Usage:**
    1. Enter a character description in the prompt
    2. **Enter text for speech generation** (recommended in current mode)
    3. {"Optionally add reference image/audio URLs (requires full models)" if not omni_api.model_loaded else "Optionally add reference image URL and choose audio source"}
    4. Choose voice profile and adjust parameters
    5. Generate your {"audio" if not omni_api.model_loaded else "avatar video"}!
    """,
    examples=[
        [
            "A professional teacher explaining a mathematical concept with clear gestures",
            "Hello students! Today we're going to learn about calculus and derivatives.",
            "",
            "",
            "21m00Tcm4TlvDq8ikWAM",
            5.0,
            3.5,
            30
        ],
        [
            "A friendly presenter speaking confidently to an audience",
            "Welcome everyone to our presentation on artificial intelligence!",
            "",
            "",
            "pNInz6obpgDQGcFmaJgB", 
            5.5,
            4.0,
            35
        ]
    ],
    allow_flagging="never",
    flagging_dir="/tmp/gradio_flagged"
)

# Mount Gradio app
app = gr.mount_gradio_app(app, iface, path="/gradio")

if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=7860)