import re

import json

import ipaddress

from datetime import datetime

import pygeoip

from flask import current_app

from ennstatus.status.functions import _send_mail

FINGERPRINT_REGEX = re.compile(r'^[A-Z0-9]{40}$', re.I)

DATE_FORMAT = '%d-%m-%Y %H:%M:%S'

gi4 = pygeoip.GeoIP('/usr/share/GeoIP/GeoIP.dat', pygeoip.MEMORY_CACHE)

mail_cache = dict()

def check_bridge(key, server):

    if key not in server:

        raise ValueError('%s key not present!\n' % key)

    else:

        if not isinstance(server[key], bool):

            error_message = ('%s has not the right type!'

                             ' Needs to be a boolean!\n') % key

            raise ValueError(error_message)

def check_json_format(server):

    for key in ('server_type', 'server_name', 'tor_status', 'fingerprint'):

        if key not in server:

            raise ValueError('%s key not present!\n' % key)

    if server['server_type'] not in ('Exit', 'Relay', 'Bridge'):

        error_message = ('server_type has not the right content!'

                         ' is: %s must be one of: Exit, Relay or Bridge\n') \

            address = ipaddress.IPv6Address(server['ip6'])

            if any([address.is_private, address.is_multicast,

                    address.is_unspecified, address.is_reserved,

                    address.is_loopback, address.link_local]):

                raise ValueError('ip is not accepted!\n')

        except ipaddress.AddressValueError:

            raise ValueError('ip is not the right format!\n')

    return True

def _send_offline_mail(server_name, last_updated):

    current_app.logger.info('Sending tor status offline mail!')

    subject = '[Ennstatus] %s Tor status went offline'

    _send_mail(server_name, last_updated, subject)

    mail_cache[server_name] = datetime.utcnow()

def update_server(server, ip):

    server['last_updated'] = datetime.utcnow().strftime(DATE_FORMAT)

    server['server_status'] = 'Online'

    server_name = server['server_name']

    if server['server_type'] == 'Bridge':

        if 'ip' in server:

            del server['ip']

        if 'ip6' in server:

            del server['ip6']

    else:

        for key in ('obfs', 'fteproxy', 'flashproxy', 'meek'):

            if key in server:

                del server[key]

            if 'ip' not in server:

            if 'ip6' not in server:

    try:

        filename = ''.join(['data/', server_name.lower(), '.json'])

        with open(filename, 'w', encoding='utf-8') as fb:

            json.dump(server, fb)

    except Exception as e:

        return e

    if server['tor_status'] == 'Offline':

        if server_name in mail_cache:

            current_app.logger.debug('Mail cache is %s' % str(mail_cache))

            send_date = mail_cache[server_name]

            now = datetime.utcnow()

            delta = now - send_date

            if delta.seconds <= 7200:

                current_app.logger.debug('Server is in mail cache but not old enough to resend mail')

                return server

            else:

                current_app.logger.debug('Server tor status is offline for more than 7200 seconds')