main_program

def main_program(ship, deck, scant, crewn):
    """
    Main program

    Parameters
    ----------
    ship : array [int, int]
        Array with hull and shield remaining points
    deck : array
        Deck of threat cards
    scant : int
        Busy scanners number from 0 to 2
    crewn : int
        Available crew members from 0 to 6

    Returns
    -------
    int
        0 without error.

    """
    i = 0
    while len(deck) > 0:
        clear_screen()
        print(f'Round #{i + 1}')
        print(f'Hull points: {ship[0]}')
        print(f'shield points: {ship[1]}')
        print(f'Cards remaining: {len(deck)}')
        print("\nStep 1: Roll all available Crew Dice")
        crew = generate_crew(crewn)
        print(crew)
        pretty_shown_crew(crew)
        scant = scan_threats(crew, scant, deck)
        print("\nStep 2: Assign scanners")
        print(f"You have {scant} scanners in use")
        print("\nStep 3: Assign Crew")
        assign_crew(crew)
        print(crew)
        print("\nStep 4: Draw a new threat card")
        deck = new_threat(deck)
        print(f"{len(deck)} card(s) remaining")
        print("\nStep 5: Roll threat die")
        activate_threat()
        print("\nStep 6:Gather all available Crew")
        crewn = 6 - scant
        if crewn < 1:
            print('You lost!')
            return (0)
        print(f"{crewn} crew members available\n")
        i += 1
        input("Press enter to start the next round\n")
    print('Won!')
    input('Press enter to exit')
    return 0