from dataclasses import dataclass

@dataclass
class Results:
    flour: float
    water: float
    sourdough: float
    salt: float

def calculator(
    base_flour: float = 500.0,
    hydration: float = 60.0,
    sourdough_hydration: float = 50.0,
    salt_percent: float = 1.6,
    sourdough_percent: float = 30
) -> Results:
    """Calculate the quantities for a bread dough based on desired hydration,
    sourdough hydration and the desired quantity of flour."""
    
    sourdough = base_flour * sourdough_percent / 100

    water_in_sourdough = sourdough * sourdough_hydration / 100
    flour_in_sourdough = sourdough - water_in_sourdough

    total_water = base_flour * hydration / 100
    water = total_water - water_in_sourdough

    flour = base_flour - flour_in_sourdough

    salt = base_flour * salt_percent / 100

    return Results(
        flour = flour,
        water = water,
        sourdough = sourdough,
        salt = salt
    )