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#!/usr/bin/env python
# -*- coding: utf8 -*-
#    Copyright 2014,2018 Mario Gomez <mario.gomez@teubi.co>
#    This file is part of MFRC522-Python
#    MFRC522-Python is a simple Python implementation for
#    the MFRC522 NFC Card Reader for the Raspberry Pi.
#    MFRC522-Python is free software: you can redistribute it and/or modify
#    it under the terms of the GNU Lesser General Public License as published by
#    the Free Software Foundation, either version 3 of the License, or
#    (at your option) any later version.
#    MFRC522-Python is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU Lesser General Public License for more details.
#    You should have received a copy of the GNU Lesser General Public License
#    along with MFRC522-Python.  If not, see <http://www.gnu.org/licenses/>.
import RPi.GPIO as GPIO
import MFRC522
import signal
continue_reading = True
# Capture SIGINT for cleanup when the script is aborted
def end_read(signal,frame):
    global continue_reading
    print "Ctrl+C captured, ending read."
    continue_reading = False
    GPIO.cleanup()
# Hook the SIGINT
signal.signal(signal.SIGINT, end_read)
# Create an object of the class MFRC522
MIFAREReader = MFRC522.MFRC522()
# This loop keeps checking for chips. If one is near it will get the UID and authenticate
while continue_reading:
    # Scan for cards    
    (status,TagType) = MIFAREReader.MFRC522_Request(MIFAREReader.PICC_REQIDL)
    # If a card is found
    if status == MIFAREReader.MI_OK:
        print "Card detected"
    # Get the UID of the card
    (status,uid) = MIFAREReader.MFRC522_Anticoll()
    # If we have the UID, continue
    if status == MIFAREReader.MI_OK:
        # Print UID
        print "Card read UID: %s,%s,%s,%s" % (uid[0], uid[1], uid[2], uid[3])
        # This is the default key for authentication
        key = [0xFF,0xFF,0xFF,0xFF,0xFF,0xFF]
        # Select the scanned tag
        MIFAREReader.MFRC522_SelectTag(uid)
        # Authenticate
        status = MIFAREReader.MFRC522_Auth(MIFAREReader.PICC_AUTHENT1A, 8, key, uid)
        print "\n"
        # Check if authenticated
        if status == MIFAREReader.MI_OK:
            # Variable for the data to write
            data = []
            # Fill the data with 0xFF
            for x in range(0,16):
                data.append(0xFF)
            print "Sector 8 looked like this:"
            # Read block 8
            MIFAREReader.MFRC522_Read(8)
            print "\n"
            print "Sector 8 will now be filled with 0xFF:"
            # Write the data
            MIFAREReader.MFRC522_Write(8, data)
            print "\n"
            print "It now looks like this:"
            # Check to see if it was written
            MIFAREReader.MFRC522_Read(8)
            print "\n"
            data = []
            # Fill the data with 0x00
            for x in range(0,16):
                data.append(0x00)
            print "Now we fill it with 0x00:"
            MIFAREReader.MFRC522_Write(8, data)
            print "\n"
            print "It is now empty:"
            # Check to see if it was written
            MIFAREReader.MFRC522_Read(8)
            print "\n"
            # Stop
            MIFAREReader.MFRC522_StopCrypto1()
            # Make sure to stop reading for cards
            continue_reading = False
        else:
            print "Authentication error"
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