app.py

# Set cache directories first, before other imports
import os
import sys
import logging
import traceback


# Configure logging
logging.basicConfig(
    level=logging.INFO,
    format='%(asctime)s - %(levelname)s - %(message)s',
    datefmt='%Y-%m-%d %H:%M:%S'
)
logger = logging.getLogger("speech_api")

# Set all cache directories to locations within /tmp
cache_dirs = {
    "HF_HOME": "/tmp/hf_home",
    "TRANSFORMERS_CACHE": "/tmp/transformers_cache",
    "HUGGINGFACE_HUB_CACHE": "/tmp/huggingface_hub_cache",
    "TORCH_HOME": "/tmp/torch_home",
    "XDG_CACHE_HOME": "/tmp/xdg_cache"
}

# Set environment variables and create directories
for env_var, path in cache_dirs.items():
    os.environ[env_var] = path
    try:
        os.makedirs(path, exist_ok=True)
        logger.info(f"📁 Created cache directory: {path}")
    except Exception as e:
        logger.error(f"❌ Failed to create directory {path}: {str(e)}")

# Now import the rest of the libraries
try:
    import librosa
    from difflib import SequenceMatcher
    import glob
    import numpy as np
    import torch
    from pydub import AudioSegment
    import tempfile
    import torchaudio
    import soundfile as sf
    from flask import Flask, request, jsonify, send_file, g
    from flask_cors import CORS
    from transformers import Wav2Vec2ForCTC, AutoProcessor, VitsModel, AutoTokenizer
    from transformers import MarianMTModel, MarianTokenizer
    from werkzeug.utils import secure_filename
    
    logger.info("✅ All required libraries imported successfully")
except ImportError as e:
    logger.critical(f"❌ Failed to import necessary libraries: {str(e)}")
    sys.exit(1)

# Check CUDA availability
if torch.cuda.is_available():
    logger.info(f"🚀 CUDA available: {torch.cuda.get_device_name(0)}")
    device = "cuda"
else:
    logger.info("⚠️ CUDA not available, using CPU")
    device = "cpu"

app = Flask(__name__)
CORS(app)

# ASR Model
ASR_MODEL_ID = "Coco-18/mms-asr-tgl-en-safetensor"
logger.info(f"🔄 Loading ASR model: {ASR_MODEL_ID}")

asr_processor = None
asr_model = None

try:
    asr_processor = AutoProcessor.from_pretrained(
        ASR_MODEL_ID,
        cache_dir=cache_dirs["TRANSFORMERS_CACHE"]
    )
    logger.info("✅ ASR processor loaded successfully")
    
    asr_model = Wav2Vec2ForCTC.from_pretrained(
        ASR_MODEL_ID,
        cache_dir=cache_dirs["TRANSFORMERS_CACHE"]
    )
    asr_model.to(device)
    logger.info(f"✅ ASR model loaded successfully on {device}")
except Exception as e:
    logger.error(f"❌ Error loading ASR model: {str(e)}")
    logger.debug(f"Stack trace: {traceback.format_exc()}")
    logger.debug(f"Python version: {sys.version}")
    logger.debug(f"Current working directory: {os.getcwd()}")
    logger.debug(f"Temp directory exists: {os.path.exists('/tmp')}")
    logger.debug(f"Temp directory writeable: {os.access('/tmp', os.W_OK)}")

# Language-specific configurations
LANGUAGE_CODES = {
    "kapampangan": "pam",
    "filipino": "fil",  # Replaced tagalog with filipino
    "english": "eng",
    "tagalog": "tgl",
}

# TTS Models (Kapampangan, Tagalog, English)
TTS_MODELS = {
    "kapampangan": "facebook/mms-tts-pam",
    "tagalog": "facebook/mms-tts-tgl",
    "english": "facebook/mms-tts-eng"
}

tts_models = {}
tts_processors = {}
for lang, model_id in TTS_MODELS.items():
    logger.info(f"🔄 Loading TTS model for {lang}: {model_id}")
    try:
        tts_processors[lang] = AutoTokenizer.from_pretrained(
            model_id, 
            cache_dir=cache_dirs["TRANSFORMERS_CACHE"]
        )
        logger.info(f"✅ {lang} TTS processor loaded")
        
        tts_models[lang] = VitsModel.from_pretrained(
            model_id, 
            cache_dir=cache_dirs["TRANSFORMERS_CACHE"]
        )
        tts_models[lang].to(device)
        logger.info(f"✅ {lang} TTS model loaded on {device}")
    except Exception as e:
        logger.error(f"❌ Failed to load {lang} TTS model: {str(e)}")
        logger.debug(f"Stack trace: {traceback.format_exc()}")
        tts_models[lang] = None

# Replace the single translation model with a dictionary of models
TRANSLATION_MODELS = {
    "pam-eng": "Coco-18/opus-mt-pam-en",
    "eng-pam": "Coco-18/opus-mt-en-pam",
    "tgl-eng": "Helsinki-NLP/opus-mt-tl-en",
    "eng-tgl": "Helsinki-NLP/opus-mt-en-tl",
    "phi": "Coco-18/opus-mt-phi"  
}

logger.info(f"🔄 Loading Translation model: {TRANSLATION_MODELS}")

# Initialize translation models and tokenizers
translation_models = {}
translation_tokenizers = {}

for model_key, model_id in TRANSLATION_MODELS.items():
    logger.info(f"🔄 Loading Translation model: {model_id}")
    
    try:
        translation_tokenizers[model_key] = MarianTokenizer.from_pretrained(
            model_id,
            cache_dir=cache_dirs["TRANSFORMERS_CACHE"]
        )
        logger.info(f"✅ Translation tokenizer loaded successfully for {model_key}")
        
        translation_models[model_key] = MarianMTModel.from_pretrained(
            model_id,
            cache_dir=cache_dirs["TRANSFORMERS_CACHE"]
        )
        translation_models[model_key].to(device)
        logger.info(f"✅ Translation model loaded successfully on {device} for {model_key}")
    except Exception as e:
        logger.error(f"❌ Error loading Translation model for {model_key}: {str(e)}")
        logger.debug(f"Stack trace: {traceback.format_exc()}")
        translation_models[model_key] = None
        translation_tokenizers[model_key] = None

# Constants
SAMPLE_RATE = 16000
OUTPUT_DIR = "/tmp/audio_outputs"
# Update the constant
REFERENCE_AUDIO_DIR = "/storage/reference_audio"

try:
    os.makedirs(OUTPUT_DIR, exist_ok=True)
    logger.info(f"📁 Created output directory: {OUTPUT_DIR}")
except Exception as e:
    logger.error(f"❌ Failed to create output directory: {str(e)}")

@app.route("/", methods=["GET"])
def home():
    return jsonify({"message": "Speech API is running", "status": "active"})

@app.route("/health", methods=["GET"])
def health_check():
    # Initialize direct language pair statuses based on loaded models
    translation_status = {}
    
    # Add status for direct model pairs
    for lang_pair in ["pam-eng", "eng-pam", "tgl-eng", "eng-tgl"]:
        translation_status[lang_pair] = "loaded" if lang_pair in translation_models and translation_models[lang_pair] is not None else "failed"
    
    # Add special phi model status
    phi_status = "loaded" if "phi" in translation_models and translation_models["phi"] is not None else "failed"
    translation_status["pam-fil"] = phi_status
    translation_status["fil-pam"] = phi_status
    translation_status["pam-tgl"] = phi_status  # Using phi model but replacing tgl with fil
    translation_status["tgl-pam"] = phi_status  # Using phi model but replacing tgl with fil
    
    health_status = {
        "api_status": "online",
        "asr_model": "loaded" if asr_model is not None else "failed",
        "tts_models": {lang: "loaded" if model is not None else "failed" 
                      for lang, model in tts_models.items()},
        "translation_models": translation_status,
        "device": device
    }
    return jsonify(health_status)

@app.route("/asr", methods=["POST"])
def transcribe_audio():
    if asr_model is None or asr_processor is None:
        logger.error("❌ ASR endpoint called but models aren't loaded")
        return jsonify({"error": "ASR model not available"}), 503
        
    try:
        if "audio" not in request.files:
            logger.warning("⚠️ ASR request missing audio file")
            return jsonify({"error": "No audio file uploaded"}), 400

        audio_file = request.files["audio"]
        language = request.form.get("language", "english").lower()

        if language not in LANGUAGE_CODES:
            logger.warning(f"⚠️ Unsupported language requested: {language}")
            return jsonify({"error": f"Unsupported language: {language}. Available: {list(LANGUAGE_CODES.keys())}"}), 400

        lang_code = LANGUAGE_CODES[language]
        logger.info(f"🔄 Processing {language} audio for ASR")

        # Save the uploaded file temporarily
        with tempfile.NamedTemporaryFile(delete=False, suffix=os.path.splitext(audio_file.filename)[-1]) as temp_audio:
            temp_audio.write(audio_file.read())
            temp_audio_path = temp_audio.name
            logger.debug(f"📁 Temporary audio saved to {temp_audio_path}")

        # Convert to WAV if necessary
        wav_path = temp_audio_path
        if not audio_file.filename.lower().endswith(".wav"):
            wav_path = os.path.join(OUTPUT_DIR, "converted_audio.wav")
            logger.info(f"🔄 Converting audio to WAV format: {wav_path}")
            try:
                audio = AudioSegment.from_file(temp_audio_path)
                audio = audio.set_frame_rate(SAMPLE_RATE).set_channels(1)
                audio.export(wav_path, format="wav")
            except Exception as e:
                logger.error(f"❌ Audio conversion failed: {str(e)}")
                return jsonify({"error": f"Audio conversion failed: {str(e)}"}), 500

        # Load and process the WAV file
        try:
            waveform, sr = torchaudio.load(wav_path)
            logger.debug(f"✅ Audio loaded: {wav_path} (Sample rate: {sr}Hz)")

            # Resample if needed
            if sr != SAMPLE_RATE:
                logger.info(f"🔄 Resampling audio from {sr}Hz to {SAMPLE_RATE}Hz")
                waveform = torchaudio.transforms.Resample(sr, SAMPLE_RATE)(waveform)

            waveform = waveform / torch.max(torch.abs(waveform))
        except Exception as e:
            logger.error(f"❌ Failed to load or process audio: {str(e)}")
            return jsonify({"error": f"Audio processing failed: {str(e)}"}), 500

        # Process audio for ASR
        try:
            inputs = asr_processor(
                waveform.squeeze().numpy(),
                sampling_rate=SAMPLE_RATE,
                return_tensors="pt",
                language=lang_code
            )
            inputs = {k: v.to(device) for k, v in inputs.items()}
        except Exception as e:
            logger.error(f"❌ ASR preprocessing failed: {str(e)}")
            return jsonify({"error": f"ASR preprocessing failed: {str(e)}"}), 500

        # Perform ASR
        try:
            with torch.no_grad():
                logits = asr_model(**inputs).logits
            ids = torch.argmax(logits, dim=-1)[0]
            transcription = asr_processor.decode(ids)
            
            logger.info(f"✅ Transcription ({language}): {transcription}")
            
            # Clean up temp files
            try:
                os.unlink(temp_audio_path)
                if wav_path != temp_audio_path:
                    os.unlink(wav_path)
            except Exception as e:
                logger.warning(f"⚠️ Failed to clean up temp files: {str(e)}")
                
            return jsonify({
                "transcription": transcription,
                "language": language,
                "language_code": lang_code
            })
        except Exception as e:
            logger.error(f"❌ ASR inference failed: {str(e)}")
            logger.debug(f"Stack trace: {traceback.format_exc()}")
            return jsonify({"error": f"ASR inference failed: {str(e)}"}), 500

    except Exception as e:
        logger.error(f"❌ Unhandled exception in ASR endpoint: {str(e)}")
        logger.debug(f"Stack trace: {traceback.format_exc()}")
        return jsonify({"error": f"Internal server error: {str(e)}"}), 500


@app.route("/tts", methods=["POST"])
def generate_tts():
    try:
        data = request.get_json()
        if not data:
            logger.warning("⚠️ TTS endpoint called with no JSON data")
            return jsonify({"error": "No JSON data provided"}), 400
            
        text_input = data.get("text", "").strip()
        language = data.get("language", "kapampangan").lower()

        if not text_input:
            logger.warning("⚠️ TTS request with empty text")
            return jsonify({"error": "No text provided"}), 400
            
        if language not in TTS_MODELS:
            logger.warning(f"⚠️ TTS requested for unsupported language: {language}")
            return jsonify({"error": f"Invalid language. Available options: {list(TTS_MODELS.keys())}"}), 400
            
        if tts_models[language] is None:
            logger.error(f"❌ TTS model for {language} not loaded")
            return jsonify({"error": f"TTS model for {language} not available"}), 503

        logger.info(f"🔄 Generating TTS for language: {language}, text: '{text_input}'")
        
        try:
            processor = tts_processors[language]
            model = tts_models[language]
            inputs = processor(text_input, return_tensors="pt")
            inputs = {k: v.to(device) for k, v in inputs.items()}
        except Exception as e:
            logger.error(f"❌ TTS preprocessing failed: {str(e)}")
            return jsonify({"error": f"TTS preprocessing failed: {str(e)}"}), 500

        # Generate speech
        try:
            with torch.no_grad():
                output = model(**inputs).waveform
                waveform = output.squeeze().cpu().numpy()
        except Exception as e:
            logger.error(f"❌ TTS inference failed: {str(e)}")
            logger.debug(f"Stack trace: {traceback.format_exc()}")
            return jsonify({"error": f"TTS inference failed: {str(e)}"}), 500

        # Save to file
        try:
            output_filename = os.path.join(OUTPUT_DIR, f"{language}_output.wav")
            sampling_rate = model.config.sampling_rate
            sf.write(output_filename, waveform, sampling_rate)
            logger.info(f"✅ Speech generated! File saved: {output_filename}")
        except Exception as e:
            logger.error(f"❌ Failed to save audio file: {str(e)}")
            return jsonify({"error": f"Failed to save audio file: {str(e)}"}), 500

        return jsonify({
            "message": "TTS audio generated",
            "file_url": f"/download/{os.path.basename(output_filename)}",
            "language": language,
            "text_length": len(text_input)
        })
    except Exception as e:
        logger.error(f"❌ Unhandled exception in TTS endpoint: {str(e)}")
        logger.debug(f"Stack trace: {traceback.format_exc()}")
        return jsonify({"error": f"Internal server error: {str(e)}"}), 500


@app.route("/download/<filename>", methods=["GET"])
def download_audio(filename):
    file_path = os.path.join(OUTPUT_DIR, filename)
    if os.path.exists(file_path):
        logger.info(f"📤 Serving audio file: {file_path}")
        return send_file(file_path, mimetype="audio/wav", as_attachment=True)
    
    logger.warning(f"⚠️ Requested file not found: {file_path}")
    return jsonify({"error": "File not found"}), 404

@app.route("/translate", methods=["POST"])
def translate_text():
    try:
        data = request.get_json()
        if not data:
            logger.warning("⚠️ Translation endpoint called with no JSON data")
            return jsonify({"error": "No JSON data provided"}), 400
            
        source_text = data.get("text", "").strip()
        source_language = data.get("source_language", "").lower()
        target_language = data.get("target_language", "").lower()

        if not source_text:
            logger.warning("⚠️ Translation request with empty text")
            return jsonify({"error": "No text provided"}), 400
        
        # Map language names to codes
        source_code = LANGUAGE_CODES.get(source_language, source_language)
        target_code = LANGUAGE_CODES.get(target_language, target_language)
        
        logger.info(f"🔄 Translating from {source_language} to {target_language}: '{source_text}'")
        
        # Special handling for pam-fil, fil-pam, pam-tgl and tgl-pam using the phi model
        use_phi_model = False
        actual_source_code = source_code
        actual_target_code = target_code
        
        # Check if we need to use the phi model with fil replacement
        if (source_code == "pam" and target_code == "fil") or (source_code == "fil" and target_code == "pam"):
            use_phi_model = True
        elif (source_code == "pam" and target_code == "tgl"):
            use_phi_model = True
            actual_target_code = "fil"  # Replace tgl with fil for the phi model
        elif (source_code == "tgl" and target_code == "pam"):
            use_phi_model = True
            actual_source_code = "fil"  # Replace tgl with fil for the phi model
            
        if use_phi_model:
            model_key = "phi"
            
            # Check if we have the phi model
            if model_key not in translation_models or translation_models[model_key] is None:
                logger.error(f"❌ Translation model for {model_key} not loaded")
                return jsonify({"error": f"Translation model not available"}), 503
                
            try:
                # Get the phi model and tokenizer
                model = translation_models[model_key]
                tokenizer = translation_tokenizers[model_key]
                
                # Prepend target language token to input
                input_text = f">>{actual_target_code}<< {source_text}"
                
                logger.info(f"🔄 Using phi model with input: '{input_text}'")
                
                # Tokenize the text
                tokenized = tokenizer(input_text, return_tensors="pt", padding=True)
                tokenized = {k: v.to(device) for k, v in tokenized.items()}
                
                # Generate translation
                with torch.no_grad():
                    translated = model.generate(**tokenized)
                
                # Decode the translation
                result = tokenizer.decode(translated[0], skip_special_tokens=True)
                
                logger.info(f"✅ Translation result: '{result}'")
                
                return jsonify({
                    "translated_text": result,
                    "source_language": source_language,
                    "target_language": target_language
                })
            except Exception as e:
                logger.error(f"❌ Translation processing failed: {str(e)}")
                logger.debug(f"Stack trace: {traceback.format_exc()}")
                return jsonify({"error": f"Translation processing failed: {str(e)}"}), 500
        else:
            # Create the regular language pair key for other language pairs
            lang_pair = f"{source_code}-{target_code}"
                
            # Check if we have a model for this language pair
            if lang_pair not in translation_models:
                logger.warning(f"⚠️ No translation model available for {lang_pair}")
                return jsonify({"error": f"Translation from {source_language} to {target_language} is not supported yet"}), 400
            
            if translation_models[lang_pair] is None or translation_tokenizers[lang_pair] is None:
                logger.error(f"❌ Translation model for {lang_pair} not loaded")
                return jsonify({"error": f"Translation model not available"}), 503
                
            try:
                # Regular translation process for other language pairs
                model = translation_models[lang_pair]
                tokenizer = translation_tokenizers[lang_pair]
                
                # Tokenize the text
                tokenized = tokenizer(source_text, return_tensors="pt", padding=True)
                tokenized = {k: v.to(device) for k, v in tokenized.items()}
                
                # Generate translation
                with torch.no_grad():
                    translated = model.generate(**tokenized)
                
                # Decode the translation
                result = tokenizer.decode(translated[0], skip_special_tokens=True)
                
                logger.info(f"✅ Translation result: '{result}'")
                
                return jsonify({
                    "translated_text": result,
                    "source_language": source_language,
                    "target_language": target_language
                })
            except Exception as e:
                logger.error(f"❌ Translation processing failed: {str(e)}")
                logger.debug(f"Stack trace: {traceback.format_exc()}")
                return jsonify({"error": f"Translation processing failed: {str(e)}"}), 500
                
    except Exception as e:
        logger.error(f"❌ Unhandled exception in translation endpoint: {str(e)}")
        logger.debug(f"Stack trace: {traceback.format_exc()}")
        return jsonify({"error": f"Internal server error: {str(e)}"}), 500

# Add this function to your app.py
def calculate_similarity(text1, text2):
    """Calculate text similarity percentage."""
    def clean_text(text):
        return text.lower()
    
    clean1 = clean_text(text1)
    clean2 = clean_text(text2)
    
    matcher = SequenceMatcher(None, clean1, clean2)
    return matcher.ratio() * 100

@app.route("/evaluate", methods=["POST"])
def evaluate_pronunciation():
    if asr_model is None or asr_processor is None:
        logger.error("❌ Evaluation endpoint called but ASR models aren't loaded")
        return jsonify({"error": "ASR model not available"}), 503
        
    try:
        if "audio" not in request.files:
            logger.warning("⚠️ Evaluation request missing audio file")
            return jsonify({"error": "No audio file uploaded"}), 400

        audio_file = request.files["audio"]
        reference_locator = request.form.get("reference_locator", "").strip()
        language = request.form.get("language", "kapampangan").lower()

        # Validate reference locator
        if not reference_locator:
            logger.warning("⚠️ No reference locator provided")
            return jsonify({"error": "Reference locator is required"}), 400

        # Construct full reference directory path
        reference_dir = os.path.join(REFERENCE_AUDIO_DIR, reference_locator)
        if not os.path.exists(reference_dir):
            logger.warning(f"⚠️ Reference directory not found: {reference_dir}")
            return jsonify({"error": f"Reference audio directory not found: {reference_locator}"}), 404

        reference_files = glob.glob(os.path.join(reference_dir, "*.wav"))
        if not reference_files:
            logger.warning(f"⚠️ No reference audio files found in {reference_dir}")
            return jsonify({"error": f"No reference audio found for {reference_locator}"}), 404

        lang_code = LANGUAGE_CODES.get(language, language)
        logger.info(f"🔄 Evaluating pronunciation for reference: {reference_locator}")

        # Save the uploaded file temporarily
        with tempfile.NamedTemporaryFile(delete=False, suffix=".wav") as temp_audio:
            temp_audio.write(audio_file.read())
            user_audio_path = temp_audio.name
            logger.debug(f"📁 User audio saved to {user_audio_path}")

        # Convert to WAV if necessary and ensure correct format
        try:
            # Load audio with librosa for consistent processing
            user_waveform, sr = librosa.load(user_audio_path, sr=SAMPLE_RATE, mono=True)
            
            # Save processed audio
            processed_path = os.path.join(OUTPUT_DIR, "processed_user_audio.wav")
            sf.write(processed_path, user_waveform, SAMPLE_RATE)
            logger.debug(f"📁 Processed user audio saved to {processed_path}")
            
            # Update user_audio_path to processed file
            user_audio_path = processed_path
        except Exception as e:
            logger.error(f"❌ Audio processing failed: {str(e)}")
            return jsonify({"error": f"Audio processing failed: {str(e)}"}), 500

        # Transcribe user audio
        try:
            # Process audio for ASR
            inputs = asr_processor(
                user_waveform,
                sampling_rate=SAMPLE_RATE,
                return_tensors="pt",
                language=lang_code
            )
            inputs = {k: v.to(device) for k, v in inputs.items()}
            
            # Perform ASR
            with torch.no_grad():
                logits = asr_model(**inputs).logits
            ids = torch.argmax(logits, dim=-1)[0]
            user_transcription = asr_processor.decode(ids)
            
            logger.info(f"✅ User transcription: {user_transcription}")
        except Exception as e:
            logger.error(f"❌ ASR inference failed: {str(e)}")
            return jsonify({"error": f"ASR inference failed: {str(e)}"}), 500

        # Compare with reference audios
        results = []
        best_score = 0
        best_reference = None
        best_transcription = None
        
        for ref_file in reference_files:
            try:
                # Load reference audio
                ref_waveform, _ = librosa.load(ref_file, sr=SAMPLE_RATE, mono=True)
                
                # Transcribe reference audio
                inputs = asr_processor(
                    ref_waveform,
                    sampling_rate=SAMPLE_RATE,
                    return_tensors="pt",
                    language=lang_code
                )
                inputs = {k: v.to(device) for k, v in inputs.items()}
                
                with torch.no_grad():
                    logits = asr_model(**inputs).logits
                ids = torch.argmax(logits, dim=-1)[0]
                ref_transcription = asr_processor.decode(ids)
                
                # Calculate similarity
                similarity = calculate_similarity(user_transcription, ref_transcription)
                
                results.append({
                    "reference_file": os.path.basename(ref_file),
                    "reference_text": ref_transcription,
                    "similarity_score": similarity
                })
                
                if similarity > best_score:
                    best_score = similarity
                    best_reference = os.path.basename(ref_file)
                    best_transcription = ref_transcription
                    
                logger.debug(f"📊 Reference '{os.path.basename(ref_file)}': {similarity:.2f}%")
            except Exception as e:
                logger.error(f"❌ Error processing reference audio {ref_file}: {str(e)}")
        
        # Clean up temp files
        try:
            if os.path.exists(user_audio_path) and user_audio_path != processed_path:
                os.unlink(user_audio_path)
        except Exception as e:
            logger.warning(f"⚠️ Failed to clean up temp files: {str(e)}")
        
        # Enhanced feedback based on score range
        is_correct = best_score >= 70.0
        feedback = ""
        
        if best_score >= 90.0:
            feedback = "Perfect pronunciation! Excellent job!"
        elif best_score >= 80.0:
            feedback = "Great pronunciation! Your accent is very good."
        elif best_score >= 70.0:
            feedback = "Good pronunciation. Keep practicing!"
        elif best_score >= 50.0:
            feedback = "Fair attempt. Try focusing on the syllables that differ from the sample."
        else:
            feedback = "Try again. Listen carefully to the sample pronunciation."
        
        # Sort results by score descending
        results.sort(key=lambda x: x["similarity_score"], reverse=True)
        
        return jsonify({
            "is_correct": is_correct,
            "score": best_score,
            "feedback": feedback,
            "user_transcription": user_transcription,
            "best_reference_transcription": best_transcription,
            "reference_locator": reference_locator,
            "details": results
        })
        
    except Exception as e:
        logger.error(f"❌ Unhandled exception in evaluation endpoint: {str(e)}")
        logger.debug(f"Stack trace: {traceback.format_exc()}")
        return jsonify({"error": f"Internal server error: {str(e)}"}), 500

@app.route("/upload_reference", methods=["POST"])
def upload_reference_audio():
    try:
        if "audio" not in request.files:
            logger.warning("⚠️ Reference upload missing audio file")
            return jsonify({"error": "No audio file uploaded"}), 400

        reference_word = request.form.get("reference_word", "").strip()
        if not reference_word:
            logger.warning("⚠️ Reference upload missing reference word")
            return jsonify({"error": "No reference word provided"}), 400

        # Validate reference word
        reference_patterns = [
            "mayap_a_abak", "mayap_a_ugtu", "mayap_a_gatpanapun", 
            "mayap_a_bengi", "komusta_ka"
        ]
        
        if reference_word not in reference_patterns:
            logger.warning(f"⚠️ Invalid reference word: {reference_word}")
            return jsonify({"error": f"Invalid reference word. Available: {reference_patterns}"}), 400

        # Create directory for reference pattern if it doesn't exist
        pattern_dir = os.path.join(REFERENCE_AUDIO_DIR, reference_word)
        os.makedirs(pattern_dir, exist_ok=True)

        # Save the reference audio file
        audio_file = request.files["audio"]
        file_path = os.path.join(pattern_dir, secure_filename(audio_file.filename))
        audio_file.save(file_path)

        # Convert to WAV if not already in that format
        if not file_path.lower().endswith('.wav'):
            base_path = os.path.splitext(file_path)[0]
            wav_path = f"{base_path}.wav"
            try:
                audio = AudioSegment.from_file(file_path)
                audio = audio.set_frame_rate(SAMPLE_RATE).set_channels(1)
                audio.export(wav_path, format="wav")
                # Remove original file if conversion successful
                os.unlink(file_path)
                file_path = wav_path
            except Exception as e:
                logger.error(f"❌ Reference audio conversion failed: {str(e)}")
                return jsonify({"error": f"Audio conversion failed: {str(e)}"}), 500

        logger.info(f"✅ Reference audio saved successfully for {reference_word}: {file_path}")

        # Count how many references we have now
        references = glob.glob(os.path.join(pattern_dir, "*.wav"))
        return jsonify({
            "message": "Reference audio uploaded successfully",
            "reference_word": reference_word,
            "file": os.path.basename(file_path),
            "total_references": len(references)
        })

    except Exception as e:
        logger.error(f"❌ Unhandled exception in reference upload: {str(e)}")
        logger.debug(f"Stack trace: {traceback.format_exc()}")
        return jsonify({"error": f"Internal server error: {str(e)}"}), 500

# Ensure directory exists
def init_reference_audio():
    try:
        os.makedirs(REFERENCE_AUDIO_DIR, exist_ok=True)
        logger.info(f"📁 Created reference audio directory: {REFERENCE_AUDIO_DIR}")
    except Exception as e:
        logger.error(f"❌ Failed to set up reference audio directory: {str(e)}")

# Add an initialization route that will be called before the first request
@app.before_request
def before_request():
    if not hasattr(g, 'initialized'):
        init_reference_audio()
        g.initialized = True



if __name__ == "__main__":
    init_reference_audio()
    logger.info("🚀 Starting Speech API server")
    logger.info(f"📊 System status: ASR model: {'✅' if asr_model else '❌'}")
    for lang, model in tts_models.items():
        logger.info(f"📊 TTS model {lang}: {'✅' if model else '❌'}")
    
    app.run(host="0.0.0.0", port=7860, debug=True)