import board
import digitalio
import time
import datetime
import os
os.environ["BLINKA_FT232H"] = "1"

class MagnetLock():

    def __init__(self,led_pin,mag_pin) -> None:
        self.led = digitalio.DigitalInOut(led_pin)
        self.mag_lock = digitalio.DigitalInOut(mag_pin)
        self.led.direction = digitalio.Direction.OUTPUT
        self.mag_lock.direction = digitalio.Direction.OUTPUT

    def unlock(self):
        self.led.value=False
        self.mag_lock.value=False

    def lock(self):
        self.led.value=True
        self.mag_lock.value=True

    def __repr__(self):
        return self.mag_lock.value

class KeyHolder():
    def __init__(self, locks) -> None:
        self.locks = locks

    def timer_lock(self,mins):
        try:
            for mag_lock in self.locks:
                mag_lock.lock()
            print(f"timer started for {mins} minutes")
            secs = mins*60
            start_time = time.time()
            end_time = start_time+secs
            while time.time() < end_time:
                tl = datetime.timedelta(seconds=round(end_time-time.time(),2))
                print(f"seconds remaining: {tl}", end="\r", flush=True)
            print("done, unlocking                    ")
            for mag_lock in self.locks:
                mag_lock.unlock()
        except Exception as e:
            print(f"exception: {e}")
        finally:
            for mag_lock in self.locks:
                mag_lock.unlock()

if __name__ == "__main__":
    a = MagnetLock(board.C4, board.D4)
    b = MagnetLock(board.C5, board.D5)
    kh = KeyHolder([a,b])