import RPi.GPIO as gpio
import os
import json
import MFRC522
import time


gpio.setmode(gpio.BCM)
gpio.setup(   a   ,    gpio.OUT)                                            #relé, definir a
gpio.setup(   b   ,    gpio.IN)                                             #rfid, definir b

master_key = '123'
new_key = False

LeitorRFID = MFRC522.MFRC522()

while True:

    status, tag_type = LeitorRFID.MFRC522_Request(LeitorRFID.PICC_REQIDL)
    if status == LeitorRFID.MI_OK:
        with open('keys.json') as json_file:
            sheet=json.load(json_file)
        status, key = LeitorRFID.MFRC522_Anticoll()
        if status == LeitorRFID.MI_OK:
            key = ':'.join(['%X' % x for x in key])
            if new_key:                                                     # definir como guardar as keys

                #adicionar key em sheet
                #with open(‘keys.json’, ‘w’) as outfile:
                    #json.dump(sheet,outfile)

                new_key = False

            else:
                if key == master_key:
                    new_key = True

                elif key in sheet:
                    gpio.output( a ,  gpio.HIGH)
                    os.system('mpg321 /home/pi/music/' + authorized + '.mp3')
                    time.sleep(0.2)
                    gpio.output( a ,  gpio.LOW)


                else:
                    os.system('mpg321 /home/pi/music/' + not_authorized + '.mp3')