import pandas as pd
from pickle import load
from datetime import datetime, date
from sklearn.preprocessing import StandardScaler
import joblib
import json
import numpy as np


class EnergyPredictionPipeline:
    scaler = None

    def __init__(
        self, scaler_path=None, wing="north", bootstrap_data: pd.DataFrame = None
    ):

        if scaler_path:
            self.scaler = self.get_scaler(scaler_path)

        if wing == "north":
            self.input_col_names = ["date", "hvac_N"]
        elif wing == "south":
            self.input_col_names = ["date", "hvac_S"]

        self.df = bootstrap_data[self.input_col_names]

    def get_scaler(self, scaler_path):
        return joblib.load(scaler_path)

    def transform_windows(self, df):
        return self.scaler.transform(df)

    def add_dimension(self, df):
        return df.reshape((1, df.shape[0], df.shape[1]))

    def convert_nan(self, df):
        return np.nan_to_num(df)

    def date_encoder(self, df):

        df["day_of_week"] = df.index.dayofweek
        df["hour_of_day"] = df.index.hour
        df["month"] = df.index.month

        df["day_encoding"] = np.sin(2 * np.pi * df["day_of_week"] / 7)
        df["hour_encoding"] = np.sin(2 * np.pi * df["hour_of_day"] / 24)
        df["month_encoding"] = np.sin(2 * np.pi * df["month"] / 12)

        df.drop(columns=["day_of_week", "hour_of_day", "month"], inplace=True)

        return df

    def prepare_input(self, df1: pd.DataFrame):

        df = df1.copy()
        df["date"] = pd.to_datetime(df["date"])
        df.set_index("date", inplace=True)
        df = df.resample("60min").mean()
        df = self.date_encoder(df)
        df.reset_index(inplace=True, drop=True)
        df = df.astype("float32")
        df = df.iloc[-24 * 7 :]

        return df

    def extract_data_from_message(self, df):
        df = df[self.input_col_names]
        self.df = pd.concat([self.df, df], axis=0)

        return self.df

    def get_window(self, df: pd.DataFrame):

        time = df["date"].iloc[-1]
        time = datetime.strptime(time, "%Y-%m-%d %H:%M:%S")

        if time.minute == 0 & time.second == 0:
            return df
        else:
            return None

    def fit(self, df: pd.DataFrame):
        df_new = self.extract_data_from_message(df)
        df_window = self.get_window(df_new)
        if df_window is not None:
            df = self.prepare_input(df_window)
            df = self.transform_windows(df)
            df = self.convert_nan(df)
            df = self.add_dimension(df)

        else:
            df = None

        return df