#!/usr/bin/env python3

import email.mime.text
import smtplib
from argparse import ArgumentParser
from json import dumps
from requests import post
from subprocess import run
from sys import argv

SIPGATE_USER='${node.metadata['icinga2']['sipgate_user']}'
SIPGATE_PASS='${node.metadata['icinga2']['sipgate_pass']}'

parser = ArgumentParser(
    prog='icinga_notification_wrapper',
    description='Icinga2 Notification Wrapper',
)
parser.add_argument(
    '--host_name',
    type=str,
    required=True,
)
parser.add_argument(
    '--service_name',
    type=str,
)
parser.add_argument(
    '--output',
    type=str,
    required=True,
)
parser.add_argument(
    '--state',
    type=str,
    required=True,
)
parser.add_argument(
    '--sms',
    type=str,
)
parser.add_argument(
    '--mail',
    type=str,
)
parser.add_argument(
    '--escalation',
    action='store_true',
)

def log_to_syslog(message):
    try:
        msg = '{}/{}: {}'.format(args.host_name, args.service_name, message)
        run(['logger', '-t', 'icinga_notification_wrapper', msg])
    except:
        # We don't expect this to fail. However, *if* it fails, we don't
        # want it to get in the way of other notifications we may have
        # to send.
        pass


def notify_per_sms():
    message = {
        'message': 'ICINGA: {host}{service} is {state}: {output}'.format(
            host=args.host_name,
            service=('/'+args.service_name if args.service_name else ''),
            state=args.state.upper(),
            output=args.output
        ),
        'smsId': 's0', # XXX what does this mean? Documentation is unclear
        'recipient': args.sms
    }
    headers = {
        'Content-type': 'application/json',
        'Accept': 'application/json'
    }
    try:
        r = post(
            'https://api.sipgate.com/v2/sessions/sms',
            json=message,
            headers=headers,
            auth=(SIPGATE_USER, SIPGATE_PASS),
        )

        if r.status_code == 204:
            log_to_syslog('Sent a SMS to "{}"'.format(args.sms))
        else:
            r.raise_for_status()
    except Exception as e:
        log_to_syslog('Sending a SMS to "{}" failed: {}'.format(args.sms, repr(e)))


def notify_per_mail():
    text = """
    _      _
   (_)____(_)___  ____ _____ _
  / / ___/ / __ \/ __ `/ __ `/
 / / /__/ / / / / /_/ / /_/ /
/_/\___/_/_/ /_/\__, /\__,_/
               /____/

Host: {host}"""

    if args.service_name:
        text += """
Service: {service}"""

    text += """
State: {state}

{output}"""

    mail = email.mime.text.MIMEText(text.format(
            host=args.host_name,
            service=args.service_name,
            state=args.state.upper(),
            output=args.output
        ),
        'plain',
        'utf-8',
    )

    if args.service_name:
        mail['Subject'] = '[ICINGA] {}/{} is {}'.format(args.host_name, args.service_name, args.state)
    else:
        mail['Subject'] = '[ICINGA] {} is {}'.format(args.host_name, args.state)

    mail['To'] = args.mail
    mail['From'] = 'noreply+icinga@kunbox.net'

    try:
        s = smtplib.SMTP('localhost')
        s.sendmail(mail['From'], [args.mail], mail.as_string())
        s.quit()

        log_to_syslog('Sent mail to "{}"'.format(args.mail))
    except Exception as e:
        log_to_syslog('Sending mail to "{}" failed: {}'.format(args.mail, repr(e)))


if __name__ == '__main__':
    args = parser.parse_args()

    log_to_syslog(' '.join(argv))

    if args.mail and not args.escalation:
        notify_per_mail()

    if args.sms:
        notify_per_sms()