#!/usr/bin/env python3
# -*- coding: utf-8 -*-

# Plugin to monitor the number of available nextcloud app updates
#
# Parameters understood:
#     config   (required)
#     autoconf (optional - used by munin-config)

# Magic markers - optional - used by installation scripts and
# munin-config:
#
#  #%# family=manual
#  #%# capabilities=autoconf
import requests
import sys
import os


class NextcloudApps:
	def __init__(self):
		self.config = [
			# available_updates
			'graph_title Nextcloud available App updates',
			'graph_args --base 1000 -l 0',
			'graph_printf %.0lf',
			'graph_vlabel updates available',
			'graph_info graph showing the number of available app updates',
			'graph_category nextcloud',
			'num_updates_available.label available app updates',
			'num_updates_available.info number of available app updates',
			'num_updates_available.min 0',
			'num_updates_available.warning 1'
		]
		self.result = list()

	def parse_data(self, api_response):
		# precaution for Nextcloud versions prior to version 14
		version = api_response['ocs']['data']['nextcloud']['system']['version'].split(sep=".")

		if int(version[0]) >= 14:
			num_updates_available = api_response['ocs']['data']['nextcloud']['system']['apps']['num_updates_available']
			self.result.append('num_updates_available.value %s' % num_updates_available)

	def run(self):
		# init request session with specific header and credentials
		with requests.Session() as s:
			# read credentials from env
			s.auth = (os.environ.get('username'), os.environ.get('password'))

			# update header for json
			s.headers.update({'Accept': 'application/json'})

			# request the data
			r = s.get(os.environ.get('url'))

		# if status code is successful continue
		if r.status_code == 200:
			self.parse_data(r.json())

			# output results to stdout
			for el in self.result:
				print(el, file=sys.stdout)

		elif r.status_code == 996:
			print('server error')
		elif r.status_code == 997:
			print('not authorized')
		elif r.status_code == 998:
			print('not found')
		else:
			print('unknown error')

	def main(self):
		# check if any argument is given
		if sys.argv.__len__() >= 2:
			# check if first argument is config or autoconf if not fetch data
			if sys.argv[1] == "config":
				# output config list to stdout
				for el in self.config:
					print(el, file=sys.stdout)

				# if DIRTYCONFIG true also return the corresponding values
				if os.environ.get('MUNIN_CAP_DIRTYCONFIG') == '1':
					self.run()

			elif sys.argv[1] == 'autoconf':
				if None in [os.environ.get('username'), os.environ.get('password')]:
					print('env variables are missing')
				else:
					print('yes')
		else:
			self.run()


if __name__ == "__main__":
	NextcloudApps().main()