#!/usr/bin/python3

#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <https://www.gnu.org/licenses/>.
#

'''
Display number of mail from gmail account and Pidgin icon if there is some unread Pidgin message
'''

import json
import time
import requests
from requests.auth import HTTPBasicAuth
import xml.dom.minidom
import getpass
import dbus
from dbus.mainloop.glib import DBusGMainLoop
import gi
gi.require_version('Gst', '1.0')
from gi.repository import GObject, GLib, Gst
from threading import Thread
from signal import signal, SIGINT
import sys
from dbusitem import DBUSItem

MAIL_ADDRESS='XXX@gmail.com'

def getMail(user, password):
    res = DBUSItem('mail')

    address = "https://mail.google.com/mail/feed/atom"
    auth=HTTPBasicAuth(user, password)
    req = requests.get(address, auth=auth)
    if req.status_code == requests.codes.ok:
        dom = xml.dom.minidom.parseString(req.text)
        try:
            nb_messages = int(dom.getElementsByTagName('fullcount')[0].firstChild.nodeValue)
            if nb_messages == 1:
                res.text = '1 msg'
            elif nb_messages > 1:
                res.text = '%d msgs' % (nb_messages)
            res.style = 'color:white'
        except Exception as e:
            res.text = str(e)
    else:
        res.text = 'Mail error %d' % (req.status_code)

    return res.toMap()

def getEvents(mail_user, mail_password, proxy):
    encoder = json.JSONEncoder()
    res = {'group':'Mail', 'items':[]}
    res['items'] += getMail(mail_user, mail_password)
    try:
        proxy.notify(encoder.encode(res), dbus_interface='com.soutade.GenericMonitor')
    except dbus.exceptions.DBusException as e:
        print(str(e))
        pass

class EventThread(Thread):
    SLEEP_TIME = 30

    def stop(self):
        self._stopLoop = True

    def run(self):
        self._stopLoop = False
        mail_password = getpass.getpass('Enter password for address %s: ' % (MAIL_ADDRESS))
        while not self._stopLoop:
            getEvents(MAIL_ADDRESS, mail_password, systray_proxy)
            # Be more reactive on signal capture
            for i in range(0, EventThread.SLEEP_TIME):
                if self._stopLoop: break
                time.sleep(1)

def signalHandler(signal_received, frame):
    eventThread.stop()
    mainLoop.quit()
    eventThread.join()
    encoder = json.JSONEncoder()
    res = {'groups':['Mail', 'Pidgin']}
    try:
        systray_proxy.deleteGroups(encoder.encode(res), dbus_interface='com.soutade.GenericMonitor')
    except Exception as e:
        pass
    sys.exit(0)

PURPLE_CONV_UPDATE_UNSEEN = 4
PURPLE_MESSAGE_SEND = 0

class PidginConversation:
    STATUS_SEEN = 0
    STATUS_UNSEEN = 1

    def __init__(self, _id):
        self._id = _id
        self.status = PidginConversation.STATUS_SEEN
        self.nbMessages = 1

    def updateNbMessages(self):
        self.nbMessages += 1
        # Status is seen until it changes
        self.status = PidginConversation.STATUS_SEEN

    def setSeen(self):
        self.status = PidginConversation.STATUS_SEEN

    def setUnseen(self):
        self.nbMessages = 0
        self.status = PidginConversation.STATUS_UNSEEN

    def isSeen(self):
        return (self.status == PidginConversation.STATUS_SEEN)

pidgin_conversations = {}

def pidginMessageReceived(account, sender, message, conversation, flags):
    pidginConversation = pidgin_conversations.get(conversation, None)
    if not pidginConversation:
        pidgin_conversations[conversation] = PidginConversation(conversation)
    else:
        pidginConversation.updateNbMessages()

def pidginMessageWrote(account, sender, message, conversation, flags):
    if not (flags & (1 << PURPLE_MESSAGE_SEND)):
        return
    pidginConversation = pidgin_conversations.get(conversation, None)
    if not pidginConversation:
        pidgin_conversations[conversation] = PidginConversation(conversation)
        pidginConversation = pidgin_conversations[conversation]
    pidginConversation.setSeen()
    pidginConversation.nbMessages = 0

def pidginConversationUpdated(conversation, _type):
    if _type != PURPLE_CONV_UPDATE_UNSEEN:
        return

    pidginConversation = pidgin_conversations.get(conversation, None)
    if not pidginConversation:
        return

    if pidginConversation.isSeen():
        if pidginConversation.nbMessages > 0:
            pidginConversation.setUnseen()
    else:
        pidginConversation.setSeen()

    encoder = json.JSONEncoder()
    # Message not seen by user
    if not pidginConversation.isSeen():
        res = {'group':'Pidgin', 'items':[]}
        res['items'] += DBUSItem('pidgin', icon='/usr/share/icons/hicolor/22x22/apps/pidgin.png', iconStyle='icon-size:22px').toMap()
        try:
            systray_proxy.notify(encoder.encode(res), dbus_interface='com.soutade.GenericMonitor')
        except dbus.exceptions.DBusException as e:
            print(str(e))
            pass
    else:
        deleteIcon = True
        # Are all messages seen ?
        for pConv in pidgin_conversations.values():
            if not pConv.isSeen():
                deleteIcon = False
                break
        if deleteIcon:
            res = {'items':['pidgin@Pidgin']}
            try:
                systray_proxy.deleteItems(encoder.encode(res), dbus_interface='com.soutade.GenericMonitor')
            except dbus.exceptions.DBusException as e:
                print(str(e))
                pass

dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)

bus = dbus.SessionBus()
systray_proxy = bus.get_object('org.gnome.Shell', '/com/soutade/GenericMonitor')

bus.add_signal_receiver(pidginMessageReceived,     'ReceivedImMsg',       'im.pidgin.purple.PurpleInterface')
bus.add_signal_receiver(pidginMessageReceived,     'ReceivedChatMsg',     'im.pidgin.purple.PurpleInterface')
bus.add_signal_receiver(pidginMessageWrote,        'WroteImMsg',          'im.pidgin.purple.PurpleInterface')
bus.add_signal_receiver(pidginMessageWrote,        'WroteChatMsg',        'im.pidgin.purple.PurpleInterface')
bus.add_signal_receiver(pidginConversationUpdated, 'ConversationUpdated', 'im.pidgin.purple.PurpleInterface')

eventThread = EventThread()
eventThread.start()

signal(SIGINT, signalHandler)

mainLoop = GLib.MainLoop()
mainLoop.run()