#!/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 time
import requests
from requests.auth import HTTPBasicAuth
import xml.dom.minidom
import getpass
from threading import Thread
from signal import signal, SIGINT
import sys
from genericmonitor import *

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)


class EventThread(Thread,GenericMonitor):
    SLEEP_TIME = 30
    MAIL_ADDRESS='XXX@gmail.com'

    def stop(self):
        self._stopLoop = True
        self.stopMainLoop()

    def _getMail(self):
        address = "https://mail.google.com/mail/feed/atom"
        auth = HTTPBasicAuth(self.MAIL_ADDRESS, self._mail_password)
        req = requests.get(address, auth=auth)
        text = ''
        style = ''
        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:
                    text = '1 msg'
                elif nb_messages > 1:
                    text = '%d msgs' % (nb_messages)
                style = 'color:white'
            except Exception as e:
                text = str(e)
        else:
            text = 'Mail error %d' % (req.status_code)

        self.mailWidget.setText(text)
        self.mailWidget.setStyle(style)
        self.notify(self.mailGroup)

    def getEvents(self):
        self._getMail()

    def run(self):
        self._stopLoop = False
        self.setupMonitor()
        self.pidgin_conversations = {}

        self.add_signal_receiver(self.pidginMessageReceived,     'ReceivedImMsg',       'im.pidgin.purple.PurpleInterface')
        self.add_signal_receiver(self.pidginMessageReceived,     'ReceivedChatMsg',     'im.pidgin.purple.PurpleInterface')
        self.add_signal_receiver(self.pidginMessageWrote,        'WroteImMsg',          'im.pidgin.purple.PurpleInterface')
        self.add_signal_receiver(self.pidginMessageWrote,        'WroteChatMsg',        'im.pidgin.purple.PurpleInterface')
        self.add_signal_receiver(self.pidginConversationUpdated, 'ConversationUpdated', 'im.pidgin.purple.PurpleInterface')
        
        self._mail_password = getpass.getpass('Enter password for address %s: ' % (self.MAIL_ADDRESS))

        self.mailWidget = GenericMonitorTextWidget('')
        mailItem = GenericMonitorItem('mail', [self.mailWidget])
        self.mailGroup = GenericMonitorGroup('Mail', [mailItem])

        icon = GenericMonitorIconWidget('/usr/share/icons/hicolor/22x22/apps/pidgin.png', 'icon-size:22px')
        pidginItem = GenericMonitorItem('pidgin', [icon])
        self.pidginGroup = GenericMonitorGroup('Pidgin', pidginItem)

        while not self._stopLoop:
            self.getEvents()
            # Be more reactive on signal capture
            for i in range(0, self.SLEEP_TIME):
                if self._stopLoop: break
                time.sleep(1)

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

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

    def displayIcon(self):
        self.notify(self.pidginGroup)

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

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

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

        # Message not seen by user
        if not pidginConversation.isSeen():
            self.displayIcon()
        else:
            deleteIcon = True
            # Are all messages seen ?
            for pConv in self.pidgin_conversations.values():
                if not pConv.isSeen():
                    deleteIcon = False
                    break
            if deleteIcon:
                items = {'items':['pidgin@Pidgin']}
                self.deleteItems(items)

    def onActivate(self):
        super().onActivate()
        for pConv in self.pidgin_conversations.values():
            if not pConv.isSeen():
                self.displayIcon()
                break
            
def signalHandler(signal_received, frame):
    eventThread.stop()
    eventThread.join()
    groups = {'groups':['Mail', 'Pidgin']}
    eventThread.deleteGroups(groups)
    sys.exit(0)

eventThread = EventThread()
eventThread.start()

signal(SIGINT, signalHandler)

eventThread.runMainLoop()