from geruecht.model.accessToken import AccessToken
from geruecht.controller import LOGGER
from datetime import datetime
import time
from threading import Thread
import hashlib
import logging
from logging.handlers import WatchedFileHandler
from geruecht import Singleton

class AccesTokenController(Thread, metaclass=Singleton):
    """ Control all createt AccesToken

        This Class create, delete, find and manage AccesToken.

        Attributes:
            tokenList: List of currents AccessToken
            lifetime: Variable for the Lifetime of one AccessToken in seconds.
    """
    instance = None
    tokenList = None
    lifetime = 60

    def __init__(self, arg):
        """ Initialize AccessTokenController

            Initialize Thread and set tokenList empty.
        """
        LOGGER.info("Initialize AccessTokenController")

        LOGGER.debug("Build Logger for VerificationThread")

        FORMATTER = logging.Formatter("%(asctime)s — %(name)s — %(levelname)s — %(message)s")

        logFileHandler = WatchedFileHandler("Verification.log")
        logFileHandler.setFormatter(FORMATTER)

        self.LOGGER = logging.getLogger("VerificationThread")
        self.LOGGER.setLevel(logging.DEBUG)
        self.LOGGER.addHandler(logFileHandler)
        self.LOGGER.propagate = False

        LOGGER.debug("Initialize Threading")
        Thread.__init__(self)
        self.tokenList = []

    def findAccesToken(self, token):
        """ Find a Token in current AccessTokens

            Iterate throw all availables AccesTokens and retrieve one, if they are the same.

            Args:
                token: Token to find

            Returns:
                An AccessToken if found or None if not found.
        """
        LOGGER.info("Search for Token: {}".format(token))
        LOGGER.debug("Iterate through List of current Tokens")
        for accToken in self.tokenList:
            LOGGER.debug("Check if AccessToken {} has Token {}".format(accToken, token))
            if accToken == token:
                LOGGER.info("Find AccessToken {} with Token {}".format(accToken, token))
                return accToken
        LOGGER.info("no AccesToken found with Token {}".format(token))
        return None

    def createAccesToken(self, user):
        """ Create an AccessToken

            Create an AccessToken for an User and add it to the tokenList.

            Args:
                user: For wich User is to create an AccessToken

            Returns:
                A created Token for User
        """
        LOGGER.info("Create AccessToken")
        now = datetime.ctime(datetime.now())
        token = hashlib.md5((now + user.dn).encode('utf-8')).hexdigest()
        accToken = AccessToken(user, token)
        LOGGER.debug("Add AccessToken {} to current Tokens".format(accToken))
        self.tokenList.append(accToken)
        LOGGER.info("Finished create AccessToken {} with Token {}".format(accToken, token))
        return token

    def isSameGroup(self, accToken, group):
        """ Verify group in AccessToken

            Verify if the User in the AccesToken has the right group.

            Args:
                accToken: AccessToken to verify.
                group: Group to verify.

            Returns:
                A Bool. If the same then True else False
        """
        print("controll if", accToken, "hase group", group)
        LOGGER.debug("Check if AccessToken {} has group {}".format(accToken, group))
        return True if accToken.user.group == group else False

    def run(self):
        """ Starting Controll-Thread

            Verify that the AccesToken are not out of date. If one AccessToken out of date it will be deletet from tokenList.
        """
        valid_time=120
        LOGGER.info("Start Thread for verification that the AccessToken are not out of date.")
        while True:
            self.LOGGER.debug("Name: {}".format(self.getName()))
            self.LOGGER.debug("Start to iterate through List of current Tokens")
            for accToken in self.tokenList:

                self.LOGGER.debug("Check if AccessToken {} is out of date".format(accToken))
                if (datetime.now() - accToken.timestamp).seconds > valid_time:
                    print("delete", accToken)
                    self.LOGGER.info("Delete AccessToken {} from List of current Tokens".format(accToken))
                    self.tokenList.remove(accToken)
                else:
                    self.LOGGER.debug("AccessToken {} is up to date. {} seconds left".format(accToken, valid_time - (datetime.now() - accToken.timestamp).seconds))
            self.LOGGER.debug("List of current Tokens: {}".format(self.tokenList))
            self.LOGGER.info("Wait 10 Seconds")
            time.sleep(10)