main.py

import requests
import datetime
from time import sleep


class BotHandler:
    def __init__(self, token):
        self.token = token
        self.api_url = "https://api.telegram.org/bot{}/".format(token)

    def get_updates(self, offset=None, timeout=30):
        method = 'getUpdates'
        params = {'timeout': timeout, 'offset': offset}
        resp = requests.get(self.api_url + method, params)
        result_json = resp.json()['result']
        return result_json

    def send_message(self, chat_id, text):
        params = {'chat_id': chat_id, 'text': text}
        method = 'sendMessage'
        resp = requests.post(self.api_url + method, params)
        return resp

    def get_last_update(self):
        get_result = self.get_updates()
        if len(get_result) > 0:
            last_update = get_result[-1]
        else:
            last_update = [{"update_id": 791413851,
                            "message": {
                                "message_id": 0,
                                "from": {
                                    "id": 193767423,
                                    "first_name": "Matias",
                                    "last_name": "Andrade",
                                    "username": "matiasAG",
                                    "language_code": "en"
                                },
                                "chat": {
                                    "id": 193767423,
                                    "first_name": "Matias",
                                    "last_name": "Andrade",
                                    "username": "matiasAG",
                                    "type": "private"
                                },
                                "date": 1500797173,
                                "text": "hi"
                            }
                            }
                           ]

        return last_update


greet_bot = BotHandler("439052623:AAHVOAvksrcfwVjYjctr22hoUW4rqMyJ7rA")
greetings = ('hello', 'hi', 'greetings', 'sup')
now = datetime.datetime.now()


def main():
    new_offset = None
    today = now.day
    hour = now.hour

    while True:
        greet_bot.get_updates(new_offset)
        last_update = greet_bot.get_last_update()
        last_update_id = last_update['update_id']
        last_chat_text = last_update['message']['text']
        last_chat_id = last_update['message']['chat']['id']
        last_chat_name = last_update['message']['chat']['first_name']

        if last_chat_text.lower() in greetings and 6 <= hour < 12:  # and today == now.day
            greet_bot.send_message(last_chat_id, 'Good Morning  {}'.format(last_chat_name))
            today += 1
        elif last_chat_text.lower() in greetings and 1 <= hour < 6:  # and today == now.day
            greet_bot.send_message(last_chat_id, 'feliz madrugada {}'.format(last_chat_name))
            today += 1
        elif last_chat_text.lower() in greetings and 12 <= hour < 17:  # and today == now.day
            greet_bot.send_message(last_chat_id, 'Good Afternoon {}'.format(last_chat_name))
            today += 1

        elif last_chat_text.lower() in greetings and 17 <= hour < 23:  # and today == now.day
            greet_bot.send_message(last_chat_id, 'Good Evening  {}'.format(last_chat_name))
            today += 1

        new_offset = last_update_id + 1


if __name__ == '__main__':
    try:
        main()
    except KeyboardInterrupt:
        exit()