# Setting up raspi for card reader
# https://pimylifeup.com/raspberry-pi-rfid-rc522/
#
from database import *
import time

import RPi.GPIO as GPIO
from mfrc522 import SimpleMFRC522

import lock

class DoorLock():
    def __init__(self):
        # initialize card reader
        self.reader = SimpleMFRC522()
        self.key = b'Mellon!'
        self.key += b' ' * (48 - len(self.key))

    def check_authorization(self, reader_id, reader_data):
        # open database
        conn = create_connection(database)

        # check if id is in the database
        with conn:
            users = select_all_users(conn)

            for user in users:
                db_id = user[0]
                name = user[1]
                user_card_id = user[2]

                if reader_id == user_card_id:
                    print("card id match found")
                    if reader_data.encode() == self.key:
                        print("user {} with card_id {} authorized".format(name, hex(reader_id)))
                        return True, db_id
                    else:
                        print("incorrect key phrase")

            # if no match was found in the database: deny entry
            print("You shall not pass!")
            print("could not authorize card_id {}".format(reader_id))
            return False, None


    def unlock_door(self):
        # TODO send command to open door lock
        # not implemented yet
        print("Unlocking door!\n\n")
        lock.unlock()

    def release_the_kraken(self):
        # TODO notify that authentication failed
        # not implemented yet
        print("Release the Kraken!")

    def run_authorization(self):
        try:
            while True:
                print("Hold card in front of reader..")
                uid, data = self.reader.read()

                print("card read: \n  uid = {}\ndata = {}\n".format(hex(uid), data))
                authorized, db_id = self.check_authorization(uid, data)

                if authorized:
                    conn = create_connection(database)
                    register_access(conn, db_id)

                    self.unlock_door()
                else:
                    print("authentication failed")
                    self.release_the_kraken()
                time.sleep(1.5)
        finally:
            GPIO.cleanup()


if __name__ == "__main__":
    # create database with some users
    conn = setup_db()
    with conn:
        create_user(conn, 'Simon', 141405954844, 0, str(datetime.utcnow()), str(datetime.utcnow()))
        create_user(conn, 'Valentin', 154921302, 0, str(datetime.utcnow()), str(datetime.utcnow()))
        users = select_all_users(conn)

    doors_of_durin = DoorLock()

    data = bytearray([0]*16)
    data  = 'Mellon!'
    #write_success = doors_of_durin.reader.write(data)
    doors_of_durin.run_authorization()
    pass