import datetime, time

class Bazooka(object):
    reload = 3
    damage = 9999
    ammo = 4
    last_shot = time.time() - reload

    def fire(self):
        if self.ammo:
            if time.time() >= self.last_shot + self.reload:
                self.ammo -= 1
                self.last_shot = time.time()
            else:
                time.sleep(self.last_shot + self.reload - time.time())
                self.ammo -= 1
                self.last_shot = time.time()
        else:
            print('No missiles left!')

    def charge(self):
        self.ammo = 4
class Truck(object):
    speed = 100
    fuel = 500
    economy = 4
    mileage = 0

    def drive(self, distance):
        if self.fuel / self.economy >= distance:
            self.fuel -= self.economy * distance
            self.mileage += distance
        else:
            return 'Need {} more fuel to cross given distance'.format(distance - self.fuel / self.economy)

    @property
    def max_distance(self):
        return self.fuel / self.economy


class Tank(Bazooka, Truck):
    shots = 0
    damage_done = 0
    def fire(self):
        super().fire()
        if self.ammo:
            self.shots += 1
            self.damage_done += self.damage


little_tank = Tank()

little_tank.drive(little_tank.max_distance / 2)
print('The tank crossed {} miles and {} fuel left'.format(little_tank.mileage, little_tank.fuel))
little_tank.fire()
print('The tank shot {shots} time(s) and did {damage} damage, so {ammo} missiles left.'.format(ammo=little_tank.ammo, damage=little_tank.damage_done, shots=little_tank.shots))
little_tank.drive(Tank().max_distance / 4)
print('The tank crossed {} miles and {} fuel left'.format(little_tank.mileage, little_tank.fuel))
little_tank.fire()
print('The tank shot {shots} time(s) and did {damage} damage, so {ammo} missiles left.'.format(ammo=little_tank.ammo, damage=little_tank.damage_done, shots=little_tank.shots))
little_tank.fire()
print('The tank shot {shots} time(s) and did {damage} damage, so {ammo} missiles left.'.format(ammo=little_tank.ammo, damage=little_tank.damage_done, shots=little_tank.shots))