#!/usr/bin/env python3
import os
import sys
from dateutil import parser
import json, logging
from flask import Flask, request
from rocketchat_API.rocketchat import RocketChat
from requests import sessions


listenPort = 29120
listenIP = '::1'
botUser = '{{ prometheus_alertmanager.rocketchatbot.user }}'
botPass = '{{ prometheus_alertmanager.rocketchatbot.pass }}'
botChatURL ='{{ prometheus_alertmanager.rocketchatbot.url }}'

app = Flask(__name__)
app.secret_key = os.urandom(128)

api_session = sessions.Session()
api = RocketChat(botUser, botPass, server_url=botChatURL, session=api_session)

@app.route('/<chatName>/alert', methods = ['POST'])
def postAlertmanager(chatName):
	try:
		content = json.loads(request.get_data())

		res = True

		for alert in content['alerts']:
			message = ""
			if alert['status'] == "firing":
				message += ":warning: "
			else:
				message += ":white_check_mark: "
			message += " [**"+alert['status']+"**] "
			if 'description' in alert['annotations']:
				message += alert['annotations']['description']
			if alert['status'] == "firing":
				message += " @here"
			message += "\n"
			if 'name' in alert['labels']:
				message += "Instance: "+alert['labels'].get('instance', 'unknown')+"("+alert['labels']['name']+")\n"
			else:
				message += "Instance: "+alert['labels'].get('instance', 'unknown')+"\n"
			if 'info' in alert['annotations']:
				message += "Info: "+alert['annotations']['info']+"\n"
			if 'summary' in alert['annotations']:
				message += "Summary: "+alert['annotations']['summary']+"\n"
			if alert['status'] == "resolved":
				correctDate = parser.parse(alert['endsAt']).strftime('%Y-%m-%d %H:%M:%S')
				message += "Resolved: "+correctDate+"\n"
			elif alert['status'] == "firing":
				correctDate = parser.parse(alert['startsAt']).strftime('%Y-%m-%d %H:%M:%S')
				message += "Started: "+correctDate+"\n"
			message += "labels: \n"
			message += "```\n"
			labels = ""
			for l in alert['labels']:
				labels += l + " : "+alert['labels'][l] + "\n"
			message += labels + "```\n"

			res &= api.chat_post_message(message, channel=chatName, alias='Alertmanager').ok

		if res:
			return "Alert OK", 200
		else:
			return "Alert fail", 200
	except Exception as error:
		api.chat_post_message("Error to read json: "+str(error), channel=chatName, alias='Alertmanager') 
		app.logger.info("\t%s",error)
		return "Alert fail", 200

if __name__ == '__main__':
	if len(sys.argv) == 1:
		logging.basicConfig(level=logging.INFO)
		app.run(host=listenIP, port=listenPort)
	else:
		from gevent.pywsgi import WSGIServer
		http_server = WSGIServer((listenIP, listenPort), app)
		http_server.serve_forever()