import logging
import os
import sys
from pathlib import Path
from fastapi import FastAPI, UploadFile, File, Form, HTTPException
from fastapi.responses import JSONResponse
from fastapi.middleware.cors import CORSMiddleware
import gradio as gr

# Configure logging FIRST
logging.basicConfig(
    level=logging.INFO,
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
    stream=sys.stdout
)
logger = logging.getLogger(__name__)

# Add project root to path
sys.path.insert(0, str(Path(__file__).parent))

# Import detector using model loader
try:
    from diagnosis.ai_engine.model_loader import get_stutter_detector
    logger.info("✅ Successfully imported model loader")
except ImportError as e:
    logger.error(f"❌ Failed to import model loader: {e}")
    raise

# Initialize FastAPI
app = FastAPI(
    title="Stutter Detector API",
    description="Speech analysis using Wav2Vec2 models for stutter detection",
    version="1.0.0"
)

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

# Global detector instance
detector = None

@app.on_event("startup")
async def startup_event():
    """Load models on startup"""
    global detector
    try:
        logger.info("🚀 Startup event: Loading AI models...")
        detector = get_stutter_detector()
        logger.info("✅ Models loaded successfully!")
    except Exception as e:
        logger.error(f"❌ Failed to load models: {e}", exc_info=True)
        raise

def gradio_analyze(audio_path, transcript=""):
    """Analyze audio for stuttering using Gradio interface"""
    if not detector:
        return {"error": "Models not loaded yet. Please try again later."}
    try:
        result = detector.analyze_audio(audio_path, transcript)
        return result
    except Exception as e:
        return {"error": f"Analysis failed: {str(e)}"}

# Create Gradio interface
gradio_app = gr.Interface(
    fn=gradio_analyze,
    inputs=[
        gr.Audio(type="filepath", label="Upload Audio File"),
        gr.Textbox(label="Optional Transcript", placeholder="Enter expected transcript here...", lines=2)
    ],
    outputs=gr.JSON(label="Analysis Results"),
    title="Stutter Detection",
    description="Upload an audio file and optionally provide a transcript to analyze for stuttering."
)

# Mount Gradio app to FastAPI at root path
gr.mount_gradio_app(app, gradio_app, path="/")

@app.get("/health")
async def health_check():
    """Health check endpoint"""
    from datetime import datetime
    return {
        "status": "healthy",
        "models_loaded": detector is not None,
        "timestamp": datetime.utcnow().isoformat() + "Z"
    }

@app.post("/analyze")
async def analyze_audio(
    audio: UploadFile = File(...),
    transcript: str = Form("")
):
    """
    Analyze audio file for stuttering
    
    Parameters:
    - audio: WAV or MP3 audio file
    - transcript: Optional expected transcript
    
    Returns: Complete stutter analysis results
    """
    temp_file = None
    try:
        if not detector:
            raise HTTPException(status_code=503, detail="Models not loaded yet. Try again in a moment.")
        
        logger.info(f"📥 Processing: {audio.filename}")
        
        # Create temp directory if needed
        temp_dir = "/tmp/stutter_analysis"
        os.makedirs(temp_dir, exist_ok=True)
        
        # Save uploaded file
        temp_file = os.path.join(temp_dir, audio.filename)
        content = await audio.read()
        
        with open(temp_file, "wb") as f:
            f.write(content)
        
        logger.info(f"📂 Saved to: {temp_file} ({len(content) / 1024 / 1024:.2f} MB)")
        
        # Analyze
        logger.info(f"🔄 Analyzing audio with transcript: '{transcript[:50] if transcript else '(empty)'}...'")
        result = detector.analyze_audio(temp_file, transcript)
        
        actual = result.get('actual_transcript', '')
        target = result.get('target_transcript', '')
        logger.info(f"✅ Analysis complete: severity={result['severity']}, mismatch={result['mismatch_percentage']}%")
        logger.info(f"📝 Result transcripts - Actual: '{actual[:100]}' (len: {len(actual)}), Target: '{target[:100]}' (len: {len(target)})")
        return result
        
    except HTTPException:
        raise
    except Exception as e:
        logger.error(f"❌ Error during analysis: {str(e)}", exc_info=True)
        raise HTTPException(status_code=500, detail=f"Analysis failed: {str(e)}")
    
    finally:
        # Cleanup
        if temp_file and os.path.exists(temp_file):
            try:
                os.remove(temp_file)
                logger.info(f"🧹 Cleaned up: {temp_file}")
            except Exception as e:
                logger.warning(f"Could not clean up {temp_file}: {e}")

if __name__ == "__main__":
    import uvicorn
    logger.info("🚀 Starting SLAQ Stutter Detector API...")
    uvicorn.run(
        app,
        host="0.0.0.0",
        port=7860,
        log_level="info"
    )