import logging
logging.basicConfig(
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
    level=logging.INFO)

import os
import json
import sys
import RPi.GPIO as GPIO
import serial
import time

RELAY_PIN = 17
RFID_EN_PIN = 27
CARDS_FILE = 'cardexport.json'
OPEN_DURATION = 5

ser = None
recent = {}
cards = {}

def init():
    global ser, cards

    GPIO.setwarnings(False)
    GPIO.setmode(GPIO.BCM)
    GPIO.setup(RELAY_PIN, GPIO.OUT)
    GPIO.output(RELAY_PIN, GPIO.LOW)
    GPIO.setup(RFID_EN_PIN, GPIO.OUT)
    GPIO.output(RFID_EN_PIN, GPIO.LOW)
    logging.info('GPIO initialized.')

    ser = serial.Serial(port='/dev/ttyAMA0', baudrate=2400, timeout=0.1)
    logging.info('Serial initialized.')

    with open(CARDS_FILE, 'r') as f:
        cards = json.load(f)
    logging.info('Read in {} card numbers.'.format(str(len(cards))))

def unlock_door():
    GPIO.output(RELAY_PIN, GPIO.HIGH)
    GPIO.output(RFID_EN_PIN, GPIO.HIGH)

    time.sleep(OPEN_DURATION)

    GPIO.output(RELAY_PIN, GPIO.LOW)
    GPIO.output(RFID_EN_PIN, GPIO.LOW)

def handle_card_read(card):
    if card in cards:
        logging.info('Card recognized.')
        member = cards[card]
    else:
        logging.info('Card not recognized. Denying access.')
        return

    if member['enabled']:
        logging.info('Member active.')
    else:
        logging.info('Member not active. Denying access.')
        return

    logging.info('DOOR ACCESS - Card: {} | Name: {} | id: {}'.format(
        card, member['name'], member['id']))

    unlock_door()

def loop():
    card = ser.readline()
    if not card:
        return

    card = card.decode().strip()
    if len(card) != 10:
        return

    now = time.time()
    if card in recent:
        if now - recent[card] < 5.0:
            recent[card] = now
            return
    recent[card] = now

    logging.info('\nRead card #' + card)
    handle_card_read(card)

if __name__ == '__main__':
    logging.info('Initializing...')
    init()

    logging.info('Running main loop...')
    try:
        while True:
            loop()
    except KeyboardInterrupt:
        logging.info('Exiting...')