import paho.mqtt.client as mqtt
import regex as re


class DoorHandle:
    def __init__(self, host, port=1883):
        self.state = None
        self.encoder_position = None

        self.token_file = 'door_tokens'
        self.nfc_logfile = 'nfc.log'

        self.mqtt_client = mqtt.Client()
        self.mqtt_client.on_connect = self.on_connect
        self.mqtt_client.on_message = self.on_message
        self.mqtt_client.connect(host=host, port=port)
        self.mqtt_client.loop_start()

        self.data_fields = ['name', 'organization', 'email', 'valid_thru']

    # The callback for when the client receives a CONNACK response from the server.
    def on_connect(self, client, userdata, flags, rc):
        print("Connected with result code " + str(rc))

        # Subscribing in on_connect() means that if we lose the connection and
        # reconnect then subscriptions will be renewed.
        client.subscribe("#")

    # The callback for when a PUBLISH message is received from the server.
    def on_message(self, client, userdata, msg):
        print(msg.topic + " " + str(msg.payload))
        if msg.topic == 'door/state/value':
            self.state = msg.payload.decode()
        elif msg.topic == 'door/position/value':
            self.encoder_position = int(msg.payload)

    def get_tokens(self):
        tokens = {}
        with open(self.token_file) as f:
            token_lines = f.readlines()
            for line in token_lines[1:]:
                data = line.split('|')
                inactive = '#' in data[0]
                token = data[0].strip().strip('#')
                name = data[1].strip() if len(data) > 1 else None
                organization = data[2].strip() if len(data) > 2 else None
                email = data[3].strip() if len(data) > 3 else None
                valid_thru = data[4].strip() if len(data) > 4 else None

                tokens[token] = {'name': name,
                                 'organization': organization,
                                 'email': email,
                                 'valid_thru': valid_thru,
                                 'inactive': inactive}
        return tokens

    def store_tokens(self, tokens):
        output = '# token | ' + ' | '.join(self.data_fields) + '\n'

        for t, data in tokens.items():
            output += '#' if data['inactive'] else ''
            output += t
            for key in self.data_fields:
                output += '|'
                output += data[key] if data[key] else ''
            output += '\n'
        with open(self.token_file, 'w') as f:
            f.write(output)



    def get_most_recent_token(self):
        # read last invalid token from logfile
        with open(self.nfc_logfile) as f:
            nfc_log = f.read()
            match = re.search(r"(?P<date>\d{4}-\d{2}-\d{2}) (?P<time>\d{2}:\d{2}:\d{2}) Invalid token: (?P<token>[[:xdigit:]]{14})",
                          nfc_log, re.REVERSE)
            return match