#!/usr/bin/python
import time
import random
import datetime
import re
import ConfigParser
import telepot
import json
import sys
import os
from telepot.loop import MessageLoop
from watchdog.observers import Observer
from watchdog.events import PatternMatchingEventHandler

version = 0.1

def writeconfig():
    global configParser
    with open('telegram-notify.conf', 'wb') as configfile:
        configParser.write(configfile)

def handle(msg):
    global configParser
    global chat_ids

    pair_pin = configParser.get('general', 'pair_pin')
    chat_id = msg['chat']['id']
    username = msg['chat']['username']
    firstname = msg['chat']['first_name']
    lastname = msg['chat']['last_name']

    command = msg['text']
    param = ''

    paired_user = [x for x in chat_ids if x['id'] == chat_id]
    is_paired = len(paired_user) > 0

    # if text starts with '/' then it's a command
    if re.match(r'^/',msg['text']):
        command = re.sub(r"\s.*",'',msg['text'])
        param = re.sub(r"^([^\s]+)\s","",msg['text'])

    print '\n\nUser %s sent command: %s (%s)' % (username, command, param)

    if command == '/pair':
        if is_paired:
            bot.sendMessage(chat_id, 'You\'re already paired.')
        elif param == pair_pin:
            chat={
                'username': username,
                'firstname': firstname,
                'lastname': lastname,
                'id': chat_id
            }
            chat_ids.append(chat)
            section = 'id-' + str(chat_id)
            if not configParser.has_section(section):
                configParser.add_section(section)
            configParser.set(section, 'username', username)
            configParser.set(section, 'firstname', firstname)
            configParser.set(section, 'lastname', lastname)
            writeconfig()
            bot.sendMessage(chat_id, 'Pairing ok.')
        else:
            bot.sendMessage(chat_id, 'Pairing failed: wrong pin.')

    elif command == '/newpin':
        if not is_paired:
            bot.sendMessage(chat_id, 'You\'re not allowed to do that. You have to pair first.')
        elif param != '':
            pair_pin = param
            configParser.set('general', 'pair_pin', pair_pin)
            writeconfig()
            bot.sendMessage(chat_id, 'The new pin is: %s' % pair_pin)
        else:
            bot.sendMessage(chat_id, 'Please specify the new pin.')

    elif command == '/unpair':
        if not is_paired:
            bot.sendMessage(chat_id, 'You\'re not allowed to do that. You have to pair first.')
        else:
            chat_ids[:] = [x for x in chat_ids if x['id'] != chat_id]
            section = 'id-' + str(chat_id)
            configParser.remove_section(section)
            writeconfig()
            bot.sendMessage(chat_id, 'Bye.')

    elif command == '/users':
        if not is_paired:
            bot.sendMessage(chat_id, 'You\'re not allowed to do that. You have to pair first.')
        else:
            users = [x['username'] + ' (' + x['firstname'] + ' ' + x['lastname'] + ')\n' for x in chat_ids]
            bot.sendMessage(chat_id, 'Paired users:\n' + "".join([str(i) for i in users]) )

    elif command == '/start':
        bot.sendMessage(chat_id, 'Started:\n' )

    elif command == '/help':
        bot.sendMessage(chat_id, 'Help:\n' )

    elif command == '/settings':
        bot.sendMessage(chat_id, 'Settings:\n' )


def processFile(filename):
    global chat_ids
    if re.match(r'.*jpg$',filename):
        for c in chat_ids:
            try:
                r=bot.sendPhoto(c['id'], open(filename, 'rb'))
                os.remove(filename)
            except:
                time.sleep(10)
    if re.match(r'.*txt$',filename):
        for c in chat_ids:
            try:
                with open(filename,'r') as f:
                    r=bot.sendMessage(c['id'], f.read())
                os.remove(filename)
            except:
                time.sleep(10)



class FilesChangedHandler(PatternMatchingEventHandler):
    patterns = ["*.jpg", "*.txt"]

    def process(self, event):
        """
        event.event_type
            'modified' | 'created' | 'moved' | 'deleted'
        event.is_directory
            True | False
        event.src_path
            path/to/observed/file
        """
        global bot
        if event.event_type=='created':
            processFile(event.src_path)

    def on_modified(self, event):
        self.process(event)

    def on_created(self, event):
        self.process(event)



def checkFiles():
    l=os.listdir(spool_dir)
    for f in l:
        processFile("%s/%s" % (spool_dir,f) )

for arg in sys.argv:
    if arg=='-v' or arg=='--version':
        print 'telegram-notify version %s - Copyright (C) 2018 by Paolo Asperti.' % version
        sys.exit(0)



configParser = ConfigParser.RawConfigParser()
configParser.read('telegram-notify.conf')

spool_dir = configParser.get('general', 'spool_dir')
# TODO: check if spool_dir exists and is a dir

chat_ids=[]
print "Allowed users: "
for p in configParser.sections():
    if re.match('^id-.*',p):
        chat_id={
            'username': configParser.get(p,'username'),
            'firstname': configParser.get(p,'firstname'),
            'lastname': configParser.get(p,'lastname'),
            'id': int(re.sub(r'^id-','',p))
        }
        chat_ids.append(chat_id)
        print(" - (%s) %s %s"  % (chat_id['username'],chat_id['firstname'],chat_id['lastname']) )

token = configParser.get('general', 'token')
bot = telepot.Bot(token)

MessageLoop(bot, handle).run_as_thread()
print 'I am listening ...'

# TODO: send message if files present in spool at start
checkFiles()

observer = Observer()
observer.schedule(FilesChangedHandler(), path=spool_dir)
observer.start()


while 1:
    time.sleep(10)
    checkFiles()