from pn532 import PN532Uart
import utime
import machine
import hashlib

DEBUG = True

try:
    door = machine.Pin(2, machine.Pin.OUT)
    door.value(0)
    
    uart = machine.UART(1, tx=16, rx=17, baudrate=9600)
    uart.write("F")
    rf = PN532Uart(2, tx=22, rx=19)
    rf.SAM_configuration()
    ic, ver, rev, support = rf.get_firmware_version()
    print('Found PN532 with firmware version: {0}.{1}'.format(ver, rev))
except Exception as e:
    rf = None
    print('No NFC reader (PN532) detected')

while rf is not None:
    try:
        uid = rf.read_passive_target()
        print("Card UUID: " + ''.join('{:02x}'.format(x) for x in uid))
        card=''.join('{:02x}'.format(x) for x in uid)
        uart.write("QG")
        uart.flush()
        c=0
        buf=''
        success = False
        while True:
            if uart.any():
                c=c+1
                buf+=str(chr(uart.read()[0]))
            if c == 4:
                break
        hash=hashlib.sha256(str("{0:#0{1}x}".format(int(buf),10)+":"+card[6:8]+card[4:6]+card[2:4]+card[0:2])[2:].encode()).digest().hex()
        f = open("hashes")
        for user in f:
            if(user.strip() == hash):
                success = True            
        if(success):
            uart.write("FH")
            door.value(1)
            utime.sleep(2)
            door.value(0)
        else:
            uart.write("FS")
        utime.sleep(2)
        buf=''
    except Exception as e:
        print('timeout!')