#!/usr/bin/env python

import requests
import logging
import os

logger = logging.getLogger(__file__)

class IpManager():
    
    ipFile = None

    def __init__(self, ipFile):
        logger.debug('Initialozing IpManager')

        self.ipFile = ipFile

    def _getLastIp(self):
        """
            Extracts the ip from the ipFile, and creates the file if it does not exist
        """

        logger.debug('getLastIp called')

        try:
            with open(self.ipFile, 'r') as f:
                ip = f.read()
           
            logger.info(f'Found ip {ip}')
            return ip

        except FileNotFoundError:
            logger.info('IP File not found, creating new one')
            open(self.ipFile, 'a').close()
            return None

        except Exception as e:
            logger.error(f'Error: {str(e)}') 
            return None

    def _storeNewIp(self, ip):
        """
            Stores the ip in the ipFile
        """
        logger.debug(f'Store {ip} to file')

        with open(self.ipFile, 'w') as f:
            f.write(ip)

    
    def _fetchCurrentIp(self):
        logger.debug('Fetching current ip')
        current = requests.get('https://api.ipify.org').text.strip()

        logger.debug(f'current ip is {current}')

        return current

    def hasIpChanged(self):
        """
            Checks if the ip has changed and returns it if so, else return False
        """

        last = self._getLastIp()
        current = self._fetchCurrentIp()

        if last is None or last != current:
            logger.debug(f'Ip has changed from {last} to {current}')
            self._storeNewIp(current)

            return current

        return None