import os

import os.path

import json

from collections import defaultdict

from datetime import datetime

from flask import current_app

from flask_mail import Mail, Message

mail = Mail()

def _send_mail(server_name, status, last_updated):

    current_app.logger.debug('Try sending mail')

    try:

        msg = Message('[Ennstatus] %s went %s' % (server_name, status))

        msg.add_recipient(current_app.config['SERVER_ADMINS'][server_name])

        msg.body = ('%s went to %s. I received the last update at %s'

                    % (server_name, status, last_updated))

        mail.send(msg)

    except KeyError:

        current_app.logger.error('Admin for %s not found!' % server_name)

    except Exception as e:

        current_app.logger.error('Unexpected error: %s' % e,

                                 exc_info=True)

    current_app.logger.debug('Finished trying!')

def _check_server(data):

    server_name = data['server_name']

    last_updated = data['last_updated']

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

    date = datetime.strptime(last_updated, '%d-%m-%Y %H:%M:%S')

    now = datetime.utcnow()

    delta = now - date

    if delta.days >= 7:

        os.remove(filename)

        current_app.logger.error('%s was removed!' % server_name)

        return False

    elif data['server_status'] == 'Offline':

        return data

    if delta.seconds >= 3600:

        status = 'Offline'

    elif delta.seconds >= 1200:

        status = 'Unknown'

    else:

        status = None

    if status is not None:

        current_app.logger.error('%s is set to %s' % (server_name,

                                 status))

        _send_mail(server_name, status, last_updated)

        for key in ('server_status', 'tor_status'):

            data[key] = status

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

            json.dump(data, file_object)

    return data

def _load_single_server(filename):

    try:

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

            server = json.load(f)

    except IOError:

        return False

    server = _check_server(server)

    return server

def single_server(name):

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

    return _load_single_server(filename)

def _get_json_files(root, files):

    for f in files:

        if f.endswith('.json'):

            yield os.path.join(root, f)

def all_servers():

    for root, _, files in os.walk('data'):

        for f in _get_json_files(root, files):

            yield _load_single_server(f)

def all_servers_by_type(type):

    for server in all_servers():

        try:

            if server['server_type'] == type:

                yield server

        except TypeError:

            continue

def split_all_servers_to_types():

    servers = defaultdict(list)

    for server in all_servers():

        try:

            servers[server['server_type']].append(server)

        except TypeError:

            continue