import slixmpp
import humanfriendly

class SendMsgBot(slixmpp.ClientXMPP):
    def __init__(self, jid, password, recipient, message):
        super().__init__(jid, password)
        self.recipient = recipient
        self.msg = message
        self.add_event_handler("session_start", self.start)

    def start(self, event):
        self.send_presence()
        self.get_roster()
        self.send_message(mto=self.recipient, mbody=self.msg, mtype='chat')
        self.disconnect()

def send_xmpp(event, next_alert, next_event, config):
    event_name = event["summary"]
    event_description = event["description"]
    event_location = event["location"]
    event_date = next_event
    event_delta = next_event - next_alert
    total_seconds = event_delta.total_seconds()
    human_readable_time = humanfriendly.format_timespan(total_seconds)

    jid = config["xmpp"]["jid"]
    password = config["xmpp"]["password"]  # replace with your password
    recipient = config["xmpp"]["recipient"]

    message = """\
    Hi,
    This is an event alert from remindme_caldav.

    Event details:
    ---------------------------------

        Event name: {}
        Date/time: {}
        Description: {}
        Location: {}
        Time until event: {}

    ---------------------------------
    """.format(event_name, event_date, event_description, event_location, human_readable_time)
    try:    
        bot = SendMsgBot(jid, password, recipient, message)
        bot.register_plugin('xep_0030')  # Service Discovery
        bot.register_plugin('xep_0199')  # XMPP Ping
        bot.connect()
        bot.process(forever=False)
        return print("Message sent via XMPP")
    except Exception as e:
        print("An error occured when sending alert via XMPP, please check your config. Message: {}".format(e))