import pandas as pd
import pickle
from typing import  Dict, List, Any
import numpy as np
import os


# set device
class EndpointHandler():
    def __init__(self, path=""):
        # load the optimized model
        pathb = os.path.join(path,"./churn.pkl")
        self.pipe = pd.read_pickle(pathb)

    def __call__(self, data: Dict[str, Any]) -> List[Dict[str, Any]]:
        """
        Args:
            data (:obj:):
                includes the input data and the parameters for the inference.
        Return:
            A :obj:`list`:. A string representing what the label/class is
        """
        inputs = data.pop("inputs", data)
        parameters = data.pop("parameters", None)
        df = pd.DataFrame(inputs)

        df["TotalCharges"] = df["TotalCharges"].replace(" ", np.nan, regex=False).astype(float)
        df = df.drop(columns=["customerID"])
        df = df.drop(columns=["Churn"])
        
        # run inference pipeline
        pred = self.pipe.predict(df)

        # postprocess the prediction
        return {"pred": pred}