import logging
import pathlib
import joblib
from coded_flows.types import Union, Str, Any, FilePath
from coded_flows.utils import CodedFlowsLogger

logger = CodedFlowsLogger(name="SHAP Load", level=logging.INFO)


def load_explainer(file_path: Union[Str, FilePath], options=None) -> Any:
    options = options or {}
    verbose = options.get("verbose", True)
    explainer = None
    try:
        verbose and logger.info(f"Attempting to load SHAP explainer from: {file_path}")
        path_obj = pathlib.Path(file_path)
        if not path_obj.exists():
            verbose and logger.error(f"File not found at path: {path_obj}")
            raise FileNotFoundError(f"The specified file does not exist: {path_obj}")
        if not path_obj.is_file():
            verbose and logger.error(f"Path is not a file: {path_obj}")
            raise ValueError(f"The specified path is not a valid file: {path_obj}")
        verbose and logger.info("File validated. Initiating load process.")
        explainer = joblib.load(path_obj)
        verbose and logger.info(
            f"Object loaded successfully. Type: {type(explainer).__name__}"
        )
    except Exception as e:
        verbose and logger.error(f"Failed to load object: {e}")
        raise e
    return explainer