import gc, os, sys, time, torch, logging, inspect, numpy as np, pandas as pd, importlib.util
from pathlib import Path
from threading import Lock
from collections import OrderedDict
from nltk.stem import WordNetLemmatizer
from typing import List, Dict, Any, Tuple, Optional
from sklearn.metrics.pairwise import cosine_similarity
from config import app_config
from dataset import TensorDataset
from utils.transformer_utils import get_sentence_transformer
from utils.smartHybridAttention import SmartHybridAttention, get_hybrid_attention_config
from transformers import AutoModelForCausalLM, AutoTokenizer
from service_registry import registry, MODEL, TOKENIZER, MODEL_MANAGER, COMMUNICATOR

logger = logging.getLogger(__name__)

try:
    import psutil
    PSUTIL_AVAILABLE = True
except ImportError:
    logger.warning("psutil not available")
    PSUTIL_AVAILABLE = False
    class DummyProcess:
        def __init__(self, pid=None): self.pid = pid or 1
        def memory_info(self):
            class MemInfo:
                def __init__(self): self.rss = 1e6; self.vms = 1e6
            return MemInfo()
        def memory_percent(self): return 1.0
    class DummyPsutil:
        @staticmethod
        def Process(pid=None): return DummyProcess(pid)
    psutil = DummyPsutil()

def safe_get_config(config_obj, key, default=None):
    if isinstance(config_obj, dict):
        return config_obj.get(key, default)
    elif hasattr(config_obj, key):
        return getattr(config_obj, key, default)
    return default

def safe_get_config_value(config_obj, key, default=None):
    try:
        if isinstance(config_obj, dict):
            return config_obj.get(key, default)
        elif hasattr(config_obj, key):
            return getattr(config_obj, key, default)
        elif isinstance(config_obj, (int, float, str, bool)):
            return config_obj
        return default
    except:
        return default

class DatasetManager:
    def __init__(self):
        self.datasets: Dict[str, Any] = {}
        self.lock = Lock()
        
    def load_dataset(self, path: str, specialization: str) -> Any:
        with self.lock:
            if specialization in self.datasets:
                logger.info(f"Using cached dataset for {specialization}")
                return self.datasets[specialization]
            dataset = self._load_and_process_dataset(path, specialization)
            self.datasets[specialization] = dataset
            return dataset
        
    def _load_and_process_dataset(self, path: str, specialization: str) -> TensorDataset:
        if not os.path.exists(path):
            raise FileNotFoundError(f"Dataset {path} not found.")
        logger.info(f"Loading dataset: {specialization}")
        data = pd.read_csv(path)
        if "label" not in data.columns:
            raise ValueError("Dataset must have a 'label' column.")
        features = data.drop("label", axis=1).values
        labels = data["label"].values
        features_tensor = torch.tensor(features, dtype=torch.float32)
        labels_tensor = torch.tensor(labels, dtype=torch.long)
        return TensorDataset(features_tensor, labels_tensor)
        
    def get_status(self) -> Dict[str, Any]:
        return {"loaded_datasets": list(self.datasets.keys()), "cache_size": len(self.datasets)}
        
    def clear_cache(self):
        with self.lock:
            self.datasets.clear()

class ModelManager:
    HF_ALIAS = {
        "EvolphTech/Wildnerve-tlm01_Hybrid_Model": "model_Combn.Wildnerve_tlm01_Hybrid_Model",
        "model_Custm": "EvolphTech/Wildnerve-tlm01_Hybrid_Model",
        "model_Custm.py": "EvolphTech/Wildnerve-tlm01_Hybrid_Model",
    }

    def __init__(self, tokenizer=None, max_active_models=5, model_idle_threshold=600):
        self.models = {}
        self.lock = Lock()
        self.model_pool = OrderedDict()
        self.max_active_models = max_active_models if isinstance(max_active_models, int) and max_active_models > 0 else 2
        self.model_idle_threshold = model_idle_threshold if isinstance(model_idle_threshold, int) and model_idle_threshold > 0 else 600
        self.tokenizer = tokenizer
        
        # Remove hardcoded specializations and use config values
        # First try SPECIALIZATIONS directly from config
        if hasattr(app_config, 'SPECIALIZATIONS') and app_config.SPECIALIZATIONS:
            self.specializations = app_config.SPECIALIZATIONS
        # Then try keys from DATASET_PATHS
        elif hasattr(app_config, 'DATASET_PATHS') and isinstance(app_config.DATASET_PATHS, dict):
            self.specializations = list(app_config.DATASET_PATHS.keys())
        # Fallback to minimal set
        else:
            self.specializations = ["general", "programming", "mathematics"]
        
        logger.info(f"Using {len(self.specializations)} specializations from config")
        
        self._performance_metrics = {}
        attention_config = get_hybrid_attention_config()
        self.smart_attention = SmartHybridAttention(
            dim=attention_config["DIM"],
            num_heads=attention_config["NUM_HEADS"],
            window_size=attention_config["WINDOW_SIZE"],
            use_sliding=attention_config["USE_SLIDING"],
            use_global=attention_config["USE_GLOBAL"],
            use_hierarchical=attention_config["USE_HIERARCHICAL"],
            global_token_ratio=attention_config["GLOBAL_TOKEN_RATIO"],
            memory_tokens=attention_config["MEMORY_TOKENS"]
        )
        self.dataset_manager = DatasetManager()
        transformer_config = safe_get_config(app_config, "TRANSFORMER_CONFIG", {})
        model_name = safe_get_config(transformer_config, "MODEL_NAME", "Wildnerve-tlm01-0.05Bx12")
        self.embedding_model = get_sentence_transformer(model_name)
        self.similarity_threshold = safe_get_config(app_config, "SIMILARITY_THRESHOLD", 0.85)
        self.top_k = safe_get_config(app_config, "TOP_K", 3)
        self.prompt_analyzer = None
        self.selected_models = self._get_selected_models()
        try:
            self._load_models()
        except Exception:
            logger.critical("Startup model loading failed, aborting ModelManager init", exc_info=True)
            raise
        logger.info(f"ModelManager initialized with {len(self.specializations)} specializations")
    
    def _get_selected_models(self) -> List[str]:
        model_files = safe_get_config(app_config, "SELECTED_MODEL", ["model_Custm.py"])
        return model_files if model_files else ["model_Custm.py"]

    def _import_model_class(self, model_key: str):
        """Robust import of model classes or HF hub repos; raises on failure."""
        key = model_key.rstrip(".py")
        alias = self.HF_ALIAS.get(key)

        try:
            # 1) HF hub repo
            if alias and "/" in alias:
                logger.info(f"Loading HF model from repo '{alias}'")
                model = AutoModelForCausalLM.from_pretrained(alias, use_auth_token=os.getenv("HF_TOKEN"))
                tok   = AutoTokenizer.from_pretrained(alias, use_auth_token=os.getenv("HF_TOKEN"))
                model.tokenizer = tok
                return model.__class__  # return the class (caller will instantiate)

            # 2) Explicit module.Class mapping
            if alias and "." in alias:
                module_name, cls_name = alias.split(".", 1)
                mod = importlib.import_module(module_name)
                return getattr(mod, cls_name)

            # 3) Local file fallback
            file_path = os.path.join(os.path.dirname(__file__), f"{key}.py")
            if os.path.isfile(file_path):
                spec = importlib.util.spec_from_file_location(key, file_path)
                mod  = importlib.util.module_from_spec(spec)
                spec.loader.exec_module(mod)
                cls = getattr(mod, key, None) or getattr(mod, "Wildnerve_tlm01", None)
                if cls:
                    return cls
                raise ImportError(f"No class '{key}' or 'Wildnerve_tlm01' in {file_path}")

            # 4) Standard Python import
            mod = importlib.import_module(key)
            cls = getattr(mod, key, None) or getattr(mod, "Wildnerve_tlm01", None)
            if cls:
                return cls
            raise ImportError(f"No class '{key}' or 'Wildnerve_tlm01' in module '{key}'")

        except Exception as e:
            logger.error(f"Failed to import model class for '{model_key}': {e}", exc_info=True)
            raise
    
    def _initialize_model_for_specialization(self, spec: str, data_dir: str):
        """Instantiate a model for a given spec, with dataset-path handling and timeout warnings."""
        # Resolve dataset path
        ds_paths = safe_get_config_value(app_config, "DATASET_PATHS", {})
        raw = ds_paths.get(spec)
        if isinstance(raw, (list, tuple)): 
            dataset_path = raw[0]
        else:
            dataset_path = raw or os.path.join(data_dir, f"{spec}.csv")

        # Ensure dataset exists (create minimal CSV if missing)
        if not os.path.exists(dataset_path):
            try:
                with open(dataset_path, "w") as f:
                    f.write("text,label\nsample text,0\n")
                logger.info(f"Created placeholder dataset for '{spec}'")
            except Exception as e:
                logger.warning(f"Could not create dataset for '{spec}': {e}")

        # Import and instantiate model with GPT-2 parameters instead of BERT
        model_cls = self._import_model_class(self.selected_models[0])
        params = dict(
            vocab_size=50257,  # GPT-2 vocab size
            specialization=spec,
            dataset_path=dataset_path,
            model_name=safe_get_config_value(app_config, "TRANSFORMER_CONFIG", {}).get("MODEL_NAME", "gpt2"),
            embedding_dim=768,  # Ensure 768-dimensional model
            num_heads=12,       # 12 heads for 768-dim
            hidden_dim=768,     # Ensure 768-dimensional model
            num_layers=12,      # More layers for larger model
            output_size=50257,  # GPT-2 vocab size
            dropout=0.1,
            max_seq_length=1024,  # Increased for 768-dim model
            pooling_mode=safe_get_config_value(app_config, "TRANSFORMER_CONFIG", {}).get("POOLING_MODE", "last"),
            tokenizer=self.tokenizer
        )

        start = time.time()
        try:
            model = model_cls(**params)
        except Exception as e:
            logger.error(f"Error instantiating '{model_cls.__name__}' for '{spec}': {e}", exc_info=True)
            raise

        elapsed = time.time() - start
        if elapsed > 30:
            logger.warning(f"Model creation for '{spec}' took {elapsed:.1f}s (>30s)")

        # Register
        self.models[spec] = model
        self.model_pool[spec] = None
        self._performance_metrics[spec] = {
            "inference_time": 0.0,
            "memory_usage": 0.0,
            "last_accessed": time.time(),
            "num_inferences": 0
        }

    def _load_models(self):
        """Load initial specializations - now only preloading 'general' to save resources."""
        # List of specializations to preload - can be expanded if desired
        initial = ["general"]  # Only preload the 'general' specialization for efficiency
        
        # Uncomment the following line to preload more specializations
        # initial = self.specializations[:2]  # Load first 2 specializations
        
        data_dir = os.environ.get("TLM_DATA_DIR", "/tmp/tlm_data")
        os.makedirs(data_dir, exist_ok=True)

        for spec in initial:
            logger.info(f"Initializing model for specialization '{spec}'")
            try:
                self._initialize_model_for_specialization(spec, data_dir)
                logger.info(f"Model for '{spec}' loaded successfully")
            except Exception:
                logger.error(f"Failed to load model for '{spec}'", exc_info=True)
                raise

        logger.info(f"{len(self.models)} models loaded at startup (of {len(self.specializations)} total)")
        
        # Add debug info about available specializations
        logger.debug(f"Available specializations: {', '.join(self.specializations)}")

    def get_or_create_model(self, specialization: str) -> Any:
        """Get an existing model or create it on demand if not already loaded"""
        with self.lock:
            # Check if model already exists
            model = self.get_model(specialization)
            if (model):
                logger.info(f"Using existing model for {specialization}")
                return model
                
            # Check if it's a valid specialization
            if specialization not in self.all_specializations and specialization != "general":
                logger.warning(f"Unknown specialization: {specialization}, using general")
                specialization = "general"
            
            # Create model if needed
            logger.info(f"Lazily loading model for {specialization}")
            
            # Remove least recently used model if needed
            if len(self.models) >= self.max_active_models:
                lru_specialization = next(iter(self.model_pool))
                self.remove_model_instance(lru_specialization)
                
            # Initialize the requested model
            data_dir = os.environ.get("TLM_DATA_DIR", "/tmp/tlm_data")
            try:
                self._initialize_model_for_specialization(specialization, data_dir)
                return self.models.get(specialization)
            except Exception as e:
                logger.error(f"Error initializing model: {e}")
                
                # Fallback to general model
                if specialization != "general" and "general" in self.models:
                    return self.models["general"]
                
                # Last resort - create a minimal model
                return self._create_minimal_model()

    def _create_minimal_model(self):
        """Create a minimal fallback model for emergencies"""
        try:
            from model_Custm import Wildnerve_tlm01
            model = Wildnerve_tlm01(
                vocab_size=50257,  # GPT-2 vocab size
                specialization="minimal",
                dataset_path=None,
                model_name="gpt2",  # Use GPT-2 instead of BERT
                embedding_dim=768,
                num_heads=12,
                hidden_dim=768,
                num_layers=2,  # Reduced layers
                output_size=50257,  # Match GPT-2 vocab
                dropout=0.1,
                max_seq_length=128,  # Reduced sequence length
                pooling_mode="last",  # GPT-2 uses last token
                tokenizer=self.tokenizer
            )
            model._is_minimal = True  # Mark as minimal model
            return model
        except Exception as e:
            logger.error(f"Failed to create minimal model: {e}")
            return None

    def get_model(self, specialization: str) -> Any:
        with self.lock:
            model = self.models.get(specialization)
            if model:
                self.model_pool.move_to_end(specialization)
                if specialization in self._performance_metrics:
                    self._performance_metrics[specialization]["last_accessed"] = time.time()
            return model
    
    def route_input(self, input_text: str) -> dict:
        # Create embedding for input text
        input_embedding = self.embedding_model.encode(input_text)
        
        # Process input through SmartHybridAttention for enhanced understanding
        if hasattr(self, 'smart_attention') and self.smart_attention:
            try:
                # Convert embedding to tensor format needed by attention
                import torch
                input_tensor = torch.tensor(input_embedding).unsqueeze(0).unsqueeze(0)  # [1, 1, dim]
                
                # Process through attention mechanism to extract key patterns
                enhanced, _ = self.smart_attention(  # FIXED: Properly unpack tuple
                    query=input_tensor,
                    key=input_tensor,
                    value=input_tensor
                )
                
                # Convert back to numpy for similarity calculations
                if isinstance(enhanced, torch.Tensor):
                    enhanced_embedding = enhanced.squeeze().cpu().numpy()
                    # Use enhanced embedding for similarity calculation
                    input_embedding = enhanced_embedding
                    logger.info("Using SmartHybridAttention for enhanced prompt routing")
            except Exception as e:
                logger.warning(f"Error using SmartHybridAttention: {e}")
        
        # Continue with existing similarity calculation
        similarities = {}
        for spec in self.specializations:
            model = self.get_model(spec)
            if model and hasattr(model, "embedding"):
                sim = cosine_similarity(input_embedding.reshape(1, -1), model.embedding.reshape(1, -1))[0][0]
                similarities[spec] = sim
        if similarities:
            best_match = max(similarities.items(), key=lambda x: x[1])
            return {"matched_specialization": best_match[0], "confidence": best_match[1], "all_scores": similarities}
        return {"matched_specialization": self.specializations[0], "confidence": 0.0, "all_scores": similarities}
    
    def get_model_for_prompt(self, prompt: str) -> Tuple[Any, str]:
        try:
            routing_result = self.route_input(prompt)
            specialization = routing_result.get("matched_specialization", self.specializations[0])
            model = self.get_or_create_model(specialization)
            start_time = time.time()
            def update_metrics():
                if specialization in self._performance_metrics:
                    m = self._performance_metrics[specialization]
                    elapsed = time.time() - start_time
                    n = m.get("num_inferences", 0) + 1
                    m["inference_time"] = ((m.get("inference_time", 0) * (n-1)) + elapsed) / n
                    m["num_inferences"] = n
                    m["last_accessed"] = time.time()
                    if hasattr(model, "get_memory_usage"):
                        m["memory_usage"] = model.get_memory_usage()
            update_metrics()
            return model, specialization
        except Exception as e:
            logger.error(f"Error selecting model: {e}")
            if self.models:
                default_key = list(self.models.keys())[0]
                return self.models[default_key], default_key
            else:
                logger.error("No models available for routing")
                return None, "none"
    
    def generate(self, prompt: str, **kwargs):
        self.validate_input(prompt)
        model, specialization = self.get_model_for_prompt(prompt)
        start_time = time.time()
        try:
            result = model.generate(prompt=prompt, **kwargs)
            elapsed = time.time() - start_time
            if specialization in self._performance_metrics:
                m = self._performance_metrics[specialization]
                n = m.get("num_inferences", 0) + 1
                m["inference_time"] = ((m.get("inference_time", 0) * (n-1)) + elapsed) / n
                m["num_inferences"] = n
                m["last_accessed"] = time.time()
            return result
        except Exception as e:
            logger.error(f"Error generating with {specialization}: {e}")
            default_spec = self.specializations[0]
            default_model = self.get_or_create_model(default_spec)
            return default_model.generate(prompt=prompt, **kwargs)
    
    def generate_streaming(self, prompt: str, **kwargs):
        self.validate_input(prompt)
        model, specialization = self.get_model_for_prompt(prompt)
        start_time = time.time()
        try:
            if hasattr(model, "generate_streaming"):
                for token in model.generate_streaming(prompt=prompt, **kwargs):
                    yield token
            else:
                logger.info("Simulating streaming generation")
                result = model.generate(prompt=prompt, **kwargs)
                for word in result.split():
                    yield word + " "
            elapsed = time.time() - start_time
            if specialization in self._performance_metrics:
                m = self._performance_metrics[specialization]
                n = m.get("num_inferences", 0) + 1
                m["inference_time"] = ((m.get("inference_time", 0) * (n-1)) + elapsed) / n
                m["num_inferences"] = n
                m["last_accessed"] = time.time()
        except Exception as e:
            logger.error(f"Error in streaming generation: {e}")
            default_spec = self.specializations[0]
            default_model = self.get_or_create_model(default_spec)
            if hasattr(default_model, "generate_streaming"):
                for token in default_model.generate_streaming(prompt=prompt, **kwargs):
                    yield token
            else:
                fallback_result = default_model.generate(prompt=prompt, **kwargs)
                for word in fallback_result.split():
                    yield word + " "
    
    def remove_model_instance(self, specialization: str) -> bool:
        with self.lock:
            if specialization in self.models:
                del self.models[specialization]
                self.model_pool.pop(specialization, None)
                gc.collect()
                if torch.cuda.is_available():
                    torch.cuda.empty_cache()
                logger.info(f"Removed model for {specialization}")
                return True
            return False
    
    def validate_input(self, input_text: str) -> bool:
        if not input_text or len(input_text.strip()) == 0:
            raise ValueError("Empty input text")
        max_length = safe_get_config(app_config, "MAX_INPUT_LENGTH", safe_get_config(app_config, "MAX_SEQ_LENGTH", 128))
        if len(input_text) > max_length:
            raise ValueError(f"Input exceeds maximum length of {max_length}")
        return True
    
    def get_health_status(self) -> Dict[str, Any]:
        with self.lock:
            process = psutil.Process(os.getpid())
            mem_info = process.memory_info()
            return {
                "active_models": len(self.models),
                "memory_usage": {
                    "rss_mb": mem_info.rss / (1024 * 1024),
                    "vms_mb": mem_info.vms / (1024 * 1024),
                    "percent": process.memory_percent()
                },
                "model_performance": self._get_model_metrics(),
                "dataset_status": self.dataset_manager.get_status(),
                "cache_efficiency": len(self.model_pool) / max(1, self.max_active_models)
            }
    
    def _get_model_metrics(self) -> Dict[str, Dict[str, Any]]: 
        metrics = {}
        for spec, model in self.models.items():
            base = self._performance_metrics.get(spec, {})
            mem_usage = 0
            if hasattr(model, "get_memory_usage"):
                mem_usage = model.get_memory_usage()
            elif hasattr(model, "parameters"):
                mem_usage = sum(p.numel() * p.element_size() for p in model.parameters()) / (1024 * 1024)
            metrics[spec] = {
                "inference_time": base.get("inference_time", 0),
                "memory_usage_mb": mem_usage,
                "last_accessed": base.get("last_accessed", 0),
                "num_inferences": base.get("num_inferences", 0),
                "model_type": model.__class__.__name__
            }
        return metrics
    
    def get_available_models(self) -> Dict[str, Any]:
        with self.lock:
            return dict(self.models)
    
    def shutdown(self):
        try:
            logger.info("Initiating shutdown")
            for spec in list(self.models.keys()):
                self.remove_model_instance(spec)
            self.dataset_manager.clear_cache()
            logger.info("Shutdown complete")
        except Exception as e:
            logger.error(f"Error during shutdown: {e}")
    
    def manage_model_cache(self):
        try:
            current = time.time()
            with self.lock:
                while len(self.models) > self.max_active_models:
                    oldest = next(iter(self.model_pool))
                    self.remove_model_instance(oldest)
                    logger.info(f"Removed LRU model: {oldest}")
                for spec, last in list(self.model_pool.items()):
                    m = self._performance_metrics.get(spec, {})
                    if m.get("last_accessed", 0) and (current - m["last_accessed"] > self.model_idle_threshold):
                        self.remove_model_instance(spec)
                        logger.info(f"Removed idle model: {spec}")
                sorted_models = sorted(self.model_pool.items(), key=lambda x: self._performance_metrics.get(x[0], {}).get("last_accessed", 0), reverse=True)
                self.model_pool = OrderedDict(sorted_models)
        except Exception as e:
            logger.error(f"Error in cache management: {e}")
    
    def set_tokenizer(self, tokenizer):
        self.tokenizer = tokenizer
        with self.lock:
            for name, model in self.models.items():
                if hasattr(model, "set_tokenizer"):
                    try:
                        model.tokenizer = tokenizer
                        logger.debug(f"Updated tokenizer for {name}")
                    except Exception as ex:
                        logger.warning(f"Failed to set tokenizer for {name}: {ex}")
        logger.info("Tokenizer updated for models")
        return self

    def initialize_models(self):
        try:
            logger.info("Initializing models from weights")
            prompt_analyzer = registry.get("prompt_analyzer")
            if not prompt_analyzer:
                try:
                    from pathlib import Path
                    model_list_path = Path(__file__).parent / "model_List.py"
                    if model_list_path.exists():
                        spec = importlib.util.find_spec("model_List")
                        if spec:
                            model_list = importlib.util.module_from_spec(spec)
                            spec.loader.exec_module(model_list)
                            if hasattr(model_list, "PromptAnalyzer"):
                                prompt_analyzer = model_list.PromptAnalyzer()
                                registry.register("prompt_analyzer", prompt_analyzer)
                                logger.info("Imported PromptAnalyzer")
                except Exception as e:
                    logger.error(f"Error importing PromptAnalyzer: {e}")
            self.prompt_analyzer = prompt_analyzer
            selected_models_list = prompt_analyzer.get_selected_models() if prompt_analyzer and hasattr(prompt_analyzer, "get_selected_models") else ["model_Custm.py"]
            logger.info(f"Selected model types: {selected_models_list}")
            
            # Use specializations from class property rather than hardcoding
            selected_specializations = self.specializations[:5]  # Only load the first 5
            
            for spec in selected_specializations:
                try:
                    model_name = selected_models_list[0].replace(".py", "")
                    from pathlib import Path
                    model_path = Path(__file__).parent / f"{model_name}.py"
                    if model_path.exists():
                        spec_obj = importlib.util.find_spec(model_name)
                        if spec_obj:
                            model_module = importlib.util.module_from_spec(spec_obj)
                            spec_obj.loader.exec_module(model_module)
                            if hasattr(model_module, "Wildnerve_tlm01"):
                                model_class = getattr(model_module, "Wildnerve_tlm01")
                                embedding_dim = 768
                                num_heads = 12 if embedding_dim % 12 == 0 else 1
                                model_instance = model_class(
                                    vocab_size=50257,  # GPT-2 vocab size
                                    specialization=spec,
                                    dataset_path=None,
                                    model_name="gpt2",  # Changed from bert-base-uncased
                                    embedding_dim=embedding_dim,
                                    num_heads=num_heads,
                                    hidden_dim=768,
                                    num_layers=2,
                                    output_size=50257,  # Match GPT-2 vocab
                                    dropout=0.1,
                                    max_seq_length=128,
                                    pooling_mode="last"  # GPT-2 uses last token
                                )
                                self.models[spec] = model_instance
                                logger.info(f"Created model for {spec}")
                except Exception as e:
                    logger.error(f"Error creating model for {spec}: {e}")
            if not self.models:
                logger.error("No models created")
                return False
            try:
                import os
                attention_config_path = os.path.join(app_config.DATA_DIR, "attention_configuration.json")
                from utils.attention_connector import get_attention_connector
                attention_connector = get_attention_connector()
                if hasattr(attention_connector, "config_path"):
                    attention_connector.config_path = attention_config_path
                    attention_connector._init_profile_selector()
                logger.info(f"Initialized attention connector with config: {attention_config_path}")
            except Exception as e:
                logger.warning(f"Failed to initialize attention connector: {e}")
            logger.info(f"Successfully initialized {len(self.models)} models")
            return True
        except Exception as e:
            logger.error(f"Error initializing models: {e}", exc_info=True)
            return False

    def get_alternative_model_for_prompt(self, prompt: str, current_model=None) -> any:
        try:
            if self.prompt_analyzer and hasattr(self.prompt_analyzer, "choose_model"):
                model_type = self.prompt_analyzer.choose_model(prompt)
                if model_type:
                    # Creates an instance of the model chosen by prompt_analyzer
                    from model_Custm import Wildnerve_tlm01
                    alt_model = Wildnerve_tlm01(
                        vocab_size=50257,  # GPT-2 vocab size
                        specialization="general",
                        dataset_path=None,
                        model_name="gpt2",  # Changed from bert-base-uncased
                        embedding_dim=768,
                        num_heads=12,
                        hidden_dim=768,
                        num_layers=6,
                        output_size=50257,  # Match GPT-2 vocab
                        dropout=0.1,
                        max_seq_length=512,
                        pooling_mode="last",  # GPT-2 uses last token
                        tokenizer=self.tokenizer
                    )
                    if alt_model != current_model:
                        logger.info("Found alternative model via prompt_analyzer")
                        return alt_model
            for name, model in self.get_available_models().items():
                if model != current_model:
                    logger.info(f"Using alternative model: {name}")
                    return model
            try:
                from model_Custm import Wildnerve_tlm01
                fallback_model = Wildnerve_tlm01(
                    vocab_size=50257,  # GPT-2 vocab size
                    specialization="general",
                    model_name="gpt2",  # Changed from bert-base-uncased
                    embedding_dim=768,
                    num_heads=12,
                    hidden_dim=768,
                    num_layers=6,
                    output_size=50257,  # Match GPT-2 vocab
                    dropout=0.1,
                    max_seq_length=512,
                    pooling_mode="last",  # GPT-2 uses last token
                    tokenizer=self.tokenizer
                )
                logger.info("Created fallback model")
                return fallback_model
            except Exception as e:
                logger.error(f"Error creating fallback model: {e}")
            return None
        except Exception as e:
            logger.error(f"Error getting alternative model: {e}")
            return None

    def prepare_model_input(self, text: str, model) -> dict:
        device = next(model.parameters()).device
        try:
            tokenizer = getattr(model, "tokenizer", None)
            if tokenizer:
                inputs = tokenizer(
                    text,
                    return_tensors="pt",
                    padding=True,
                    truncation=True,
                    max_length=safe_get_config_value(app_config, "MAX_SEQ_LENGTH", 512)
                )
                input_ids = inputs["input_ids"].to(device)
                return {"input_ids": input_ids, "max_length": safe_get_config_value(app_config, "MAX_SEQ_LENGTH", 512), "device": device, "temperature": getattr(self, "generation_config", {}).get("temperature", 0.7)}
            else:
                logger.warning("No tokenizer in model; using basic input")
                return {"input_text": text, "max_length": safe_get_config_value(app_config, "MAX_SEQ_LENGTH", 512)}
        except Exception as e:
            logger.error(f"Error preparing model input: {e}")
            return {"input_text": text}

    def process_with_context(self, input_text: str, context: Optional[dict] = None) -> dict:
        conversation_context = self.get_conversation_context(window_size=3)
        contextualized_prompt = input_text
        if (conversation_context):
            max_seq_length = safe_get_config_value(app_config, "MAX_SEQ_LENGTH", 512)
            max_seq_length = int(max_seq_length) if isinstance(max_seq_length, (int, float)) else 512
            contextualized_prompt = f"Previous conversation:\n{conversation_context}\n\nCurrent question: {input_text}"
        result = self.process_input(contextualized_prompt, context)
        if isinstance(result, dict):
            result["original_query"] = input_text
        return result

    def get_conversation_context(self, window_size: int = 3) -> str:
        if not hasattr(self, "conversation_history"):
            self.conversation_history = []
        recent = self.conversation_history[-window_size*2:]
        lines = []
        for entry in recent:
            prefix = "User: " if entry["role"]=="user" else "Assistant: "
            lines.append(f"{prefix}{entry['content']}")
        return "\n".join(lines)

# Factory methods for model manager creation
def create_model_manager(tokenizer=None) -> ModelManager:
    try:
        max_active_models = safe_get_config_value(app_config, "MAX_ACTIVE_MODELS", 2)
        model_idle_threshold = safe_get_config_value(app_config, "MODEL_IDLE_THRESHOLD", 600)
        manager = ModelManager(tokenizer=tokenizer, max_active_models=max_active_models, model_idle_threshold=model_idle_threshold)
        if tokenizer:
            manager.set_tokenizer(tokenizer)
        elif registry.has(TOKENIZER):
            manager.set_tokenizer(registry.get(TOKENIZER))
        registry.register(MODEL_MANAGER, manager)
        return manager
    except Exception as e:
        logger.error(f"Error creating ModelManager: {e}")
        minimal_manager = ModelManager(tokenizer=tokenizer, max_active_models=1)
        registry.register(MODEL_MANAGER, minimal_manager)
        return minimal_manager

def create_model_manager_with_tokenizer(tokenizer):
    try:
        max_active_models = safe_get_config_value(app_config, "MAX_ACTIVE_MODELS", 2)
        model_idle_threshold = safe_get_config_value(app_config, "MODEL_IDLE_THRESHOLD", 600)
        manager = ModelManager(max_active_models=max_active_models, model_idle_threshold=model_idle_threshold)
        manager.tokenizer = tokenizer
        manager.initialize_models()
        registry.register(MODEL_MANAGER, manager)
        return manager
    except Exception as e:
        logger.error(f"Error creating ModelManager with tokenizer: {e}")
        minimal_manager = ModelManager(max_active_models=1)
        minimal_manager.tokenizer = tokenizer
        registry.register(MODEL_MANAGER, minimal_manager)
        return minimal_manager

if __name__ == "__main__":
    tokenizer = registry.get(TOKENIZER)
    if not tokenizer:
        from utils.transformer_utils import get_tokenizer
        tokenizer = get_tokenizer("bert-base-uncased")
        registry.register(TOKENIZER, tokenizer)
    model_manager = create_model_manager(tokenizer)
    logger.info(f"Model Manager initialized with {len(model_manager.models)} models")
else:
    model_manager = None
    logger.info("ModelManager module imported; initialization deferred")

# Optional late registration - can be moved to a function to be called after imports
def register_models():
    """Register models after imports to avoid circular dependencies."""
    import os
    from service_registry import registry, MODEL, PRETRAINED_MODEL, TOKENIZER
    from tokenizer import TokenizerWrapper
    
    # Import here to avoid circular imports
    try:
        from model_Custm import Wildnerve_tlm01
        from model_PrTr import Wildnerve_tlm01 as PretrainedModel

        # Instantiate & register tokenizer
        tok = TokenizerWrapper()
        registry.register(TOKENIZER, tok, overwrite=True)
        
        # Instantiate & register custom model
        custom = Wildnerve_tlm01(tokenizer=tok)
        registry.register(MODEL, custom, overwrite=True)
        
        # Instantiate & register pretrained model
        pre = PretrainedModel(tokenizer=tok)
        registry.register(PRETRAINED_MODEL, pre, overwrite=True)
        return True
    except Exception as e:
        logger.error(f"Failed to register models: {e}")
        return False