from decimal import Decimal
from datetime import datetime

from app.models.auto import Auto_Delivery


def update_automatic(get_delivery, gallons_delivered ):
     
        now = datetime.utcnow()


        get_auto_delivery = (db.session 
            .query(Auto_Delivery) 
            .filter(Auto_Delivery.customer_id == get_delivery.customer_id) 
            .first())
        
        gallons_put_in_home = Decimal(gallons_delivered)

        customer_home_factor = get_auto_delivery.house_factor


        new_home_factor = calc_home_factor(gallons_put_in_home = gallons_put_in_home,
                                            current_house_factor=customer_home_factor)
        get_auto_delivery.house_factor = new_home_factor
        get_auto_delivery.tank_height = 'Full'
        get_auto_delivery.last_fill = now
        get_auto_delivery.estimated_gallons_left = 240
        get_auto_delivery.estimated_gallons_left_prev_day = 240
        get_auto_delivery.auto_status = 0
   
        db.session.add(get_auto_delivery)


def calc_home_factor(gallons_put_in_home, current_house_factor):


        if 200.01 >= gallons_put_in_home >= 500:
            customer_home_factor = Decimal(current_house_factor) + Decimal(1)
        elif 170.01 <= gallons_put_in_home <= 200:
            customer_home_factor = Decimal(current_house_factor) + Decimal(1.5)
        elif 150.01 <= gallons_put_in_home <= 170:
            customer_home_factor = Decimal(current_house_factor) + Decimal(1.25)
        elif 120.01 <= gallons_put_in_home <= 150:
            customer_home_factor = Decimal(current_house_factor) - Decimal(.25)
        elif 90.01 <= gallons_put_in_home <= 120:
            customer_home_factor = Decimal(current_house_factor) - Decimal(.50)
        elif 0.01 <= gallons_put_in_home <= 90:
            customer_home_factor = Decimal(current_house_factor) - Decimal(.75)
        else:
            customer_home_factor = Decimal(current_house_factor)

        return customer_home_factor