"""
Base Model Module

Abstract base class for all AI models in the DuDONG system.
Provides common interface and functionality for model loading and prediction.
"""

from abc import ABC, abstractmethod
from typing import Any, Dict, Optional
import logging

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


class BaseModel(ABC):
    """
    Abstract base class for AI models.
    
    All model wrappers should inherit from this class and implement
    the required abstract methods.
    
    Attributes:
        model_path (str): Path to the model file/directory
        device (str): Device to run model on ('cuda' or 'cpu')
        model (Any): The loaded model object
        _is_loaded (bool): Flag indicating if model is loaded
    """
    
    def __init__(self, model_path: str, device: str = "cpu"):
        """
        Initialize the base model.
        
        Args:
            model_path: Path to the model file or directory
            device: Device to use for inference ('cuda' or 'cpu')
        """
        self.model_path = model_path
        self.device = device
        self.model: Optional[Any] = None
        self._is_loaded = False
        
        logger.info(f"Initializing {self.__class__.__name__} with device: {device}")
    
    @abstractmethod
    def load(self) -> bool:
        """
        Load the model from disk.
        
        This method must be implemented by all subclasses.
        
        Returns:
            bool: True if model loaded successfully, False otherwise
        """
        pass
    
    @abstractmethod
    def predict(self, input_data: Any) -> Dict[str, Any]:
        """
        Run inference on the input data.
        
        This method must be implemented by all subclasses.
        
        Args:
            input_data: Input data for prediction (format varies by model)
        
        Returns:
            Dict[str, Any]: Dictionary containing prediction results
        """
        pass
    
    @property
    def is_loaded(self) -> bool:
        """
        Check if the model is loaded (property accessor).
        
        Returns:
            bool: True if model is loaded, False otherwise
        """
        return self._is_loaded
    
    def unload(self) -> None:
        """
        Unload the model from memory.
        
        This can be overridden by subclasses if special cleanup is needed.
        """
        if self.model is not None:
            del self.model
            self.model = None
            self._is_loaded = False
            logger.info(f"{self.__class__.__name__} unloaded")
    
    def get_device(self) -> str:
        """
        Get the device the model is running on.
        
        Returns:
            str: Device name ('cuda' or 'cpu')
        """
        return self.device
    
    def __repr__(self) -> str:
        """
        String representation of the model.
        
        Returns:
            str: Model information
        """
        status = "loaded" if self._is_loaded else "not loaded"
        return f"{self.__class__.__name__}(device={self.device}, status={status})"