# Slixmpp: The Slick XMPP Library
# Copyright (C) 2013 Nathanael C. Fritz, Lance J.T. Stout
# This file is part of slixmpp.
# See the file LICENSE for copying permission.
import logging

from slixmpp.stanza import Iq
from slixmpp.xmlstream.handler import Callback
from slixmpp.xmlstream.matcher import MatchXPath
from slixmpp.xmlstream import register_stanza_plugin
from slixmpp.plugins import BasePlugin
from slixmpp.plugins.google.gmail import stanza


log = logging.getLogger(__name__)


class Gmail(BasePlugin):

    """
    Google: Gmail Notifications

    Also see <https://developers.google.com/talk/jep_extensions/gmail>.
    """

    name = 'gmail'
    description = 'Google: Gmail Notifications'
    dependencies = set()
    stanza = stanza

    def plugin_init(self):
        register_stanza_plugin(Iq, stanza.GmailQuery)
        register_stanza_plugin(Iq, stanza.MailBox)
        register_stanza_plugin(Iq, stanza.NewMail)

        self.xmpp.register_handler(
                Callback('Gmail New Mail',
                    MatchXPath('{%s}iq/{%s}%s' % (
                        self.xmpp.default_ns,
                        stanza.NewMail.namespace,
                        stanza.NewMail.name)),
                    self._handle_new_mail))

        self._last_result_time = None
        self._last_result_tid = None

    def plugin_end(self):
        self.xmpp.remove_handler('Gmail New Mail')

    def _handle_new_mail(self, iq):
        log.info('Gmail: New email!')
        iq.reply().send()
        self.xmpp.event('gmail_notification')

    def check(self, timeout=None, callback=None):
        last_time = self._last_result_time
        last_tid = self._last_result_tid

        callback = lambda iq: self._update_last_results(iq, callback)

        return self.search(newer_time=last_time,
                           newer_tid=last_tid,
                           timeout=timeout,
                           callback=callback)

    def _update_last_results(self, iq, callback=None):
        self._last_result_time = iq['gmail_messages']['result_time']
        threads = iq['gmail_messages']['threads']
        if threads:
            self._last_result_tid = threads[0]['tid']
        if callback:
            callback(iq)

    def search(self, query=None, newer_time=None, newer_tid=None,
                     timeout=None, callback=None):
        if not query:
            log.info('Gmail: Checking for new email')
        else:
            log.info('Gmail: Searching for emails matching: "%s"', query)
        iq = self.xmpp.Iq()
        iq['type'] = 'get'
        iq['to'] = self.xmpp.boundjid.bare
        iq['gmail']['search'] = query
        iq['gmail']['newer_than_time'] = newer_time
        iq['gmail']['newer_than_tid'] = newer_tid
        return iq.send(timeout=timeout, callback=callback)