import serial
import time
from threading import Thread

class access_control:
    _in_payloads = []
    _read_buffer = []
    _door_state: bool = 0
    serial_adapter: serial.Serial
    def __init__(self, serial_port: str):
        self.serial_adapter = serial.Serial(serial_port,baudrate=115200)
        Thread(target=self.read_serial).start()
        Thread(target=self._process_payload).start()
    def read_serial(self):
        while True:
            if self.serial_adapter.in_waiting:
                in_byte = self.serial_adapter.read(1)
                if(in_byte==b'\xFF'):
                    self._in_payloads.append(self._read_buffer)
                    self._read_buffer = []
                else:
                    self._read_buffer.append(in_byte)
    def _process_payload(self):
        while True:
            self._process_payload_once()
                                 
    def _process_payload_once(self):
        if(len(self._in_payloads)>0):
            payload = self._in_payloads.pop(0)
            if(payload[0]==b'\x01'):
                if(payload[1]==b'\x00'):
                    self._door_state = True
                elif(payload[1]==b'\01'):
                    self._door_state = False   
    def light_on(self):
        packet = bytearray()
        packet.append(0x00)
        packet.append(0x01)
        packet.append(0xFF)
        self.serial_adapter.write(packet)
    def light_off(self):
        packet = bytearray()
        packet.append(0x00)
        packet.append(0x00)
        packet.append(0xFF)
        self.serial_adapter.write(packet)
    def _request_door_state(self):
        packet = bytearray()
        packet.append(0x01)
        packet.append(0xFF)
        self.serial_adapter.write(packet)
    def get_door_state(self) -> bool:
        self._request_door_state()
        time.sleep(0.25)
        return self._door_state