import serial
import sys

class Const:
    S5 = 35
    S2 = 36
    S1 = 32
    S3 = 39
    S4 = 34

    B1 = 26

class Pin:
    def __init__(self, id, initValue):
        self.id = id
        self.value = initValue

    def updateValue(self, value):
        if (self.value > value):
            diff = self.value - value
            self.value = value
            return (self, -1 * diff)
        elif (self.value < value):
            diff = value - self.value
            self.value = value
            return (self, diff)
        else:
            return (self, 0)

class SerialListener:
    ser: serial.Serial = None
    pins = {}
    def __init__(self, device = '/dev/serial0', rate = 9600):
        self.ser = serial.Serial(device, rate)

    def reInit(self):
        if self.ser:
            self.ser.close()
            self.ser.open()

    def listen(self):
        while True:
            try:
                if self.ser.in_waiting > 0:
                    data = self.ser.readline().decode().split("\n")[0].split("-")
                    pin = int(data[0])
                    value = int(data[1])
                    if pin not in self.pins:
                        self.pins[pin] = Pin(pin, value)
                    else:
                        yield self.pins[pin].updateValue(value)
            except KeyboardInterrupt:
                print("exit from main loop")
                sys.exit(0)
            except:
                self.reInit()

if __name__ == "__main__":
    listener = SerialListener()
    for pin in listener.listen():
        if (pin[1] == 0):
            continue
        
        print(pin[0].id, pin[1])