#!/usr/bin/env python
# -*- coding: utf-8 -*-

# This is a simple echo bot using decorators and webhook with CherryPy
# It echoes any incoming text messages and does not use the polling method.

import logging

import cherrypy

import telebot

API_TOKEN = "<api_token>"

WEBHOOK_HOST = "<ip/host where the bot is running>"
WEBHOOK_PORT = 8443  # 443, 80, 88 or 8443 (port need to be 'open')
WEBHOOK_LISTEN = "0.0.0.0"  # In some VPS you may need to put here the IP addr

WEBHOOK_SSL_CERT = "./webhook_cert.pem"  # Path to the ssl certificate
WEBHOOK_SSL_PRIV = "./webhook_pkey.pem"  # Path to the ssl private key

# Quick'n'dirty SSL certificate generation:
#
# openssl genrsa -out webhook_pkey.pem 2048
# openssl req -new -x509 -days 3650 -key webhook_pkey.pem -out webhook_cert.pem
#
# When asked for "Common Name (e.g. server FQDN or YOUR name)" you should reply
# with the same value in you put in WEBHOOK_HOST

WEBHOOK_URL_BASE = "https://%s:%s" % (WEBHOOK_HOST, WEBHOOK_PORT)
WEBHOOK_URL_PATH = "/%s/" % (API_TOKEN)

logger = telebot.logger
telebot.logger.setLevel(logging.INFO)

bot = telebot.TeleBot(API_TOKEN)


# WebhookServer, process webhook calls
class WebhookServer(object):
    @cherrypy.expose
    def index(self):
        if (
            "content-length" in cherrypy.request.headers
            and "content-type" in cherrypy.request.headers
            and cherrypy.request.headers["content-type"] == "application/json"
        ):
            length = int(cherrypy.request.headers["content-length"])
            json_string = cherrypy.request.body.read(length).decode("utf-8")
            update = telebot.types.Update.de_json(json_string)
            bot.process_new_updates([update])
            return ""
        else:
            raise cherrypy.HTTPError(403)


# Handle '/start' and '/help'
@bot.message_handler(commands=["help", "start"])
def send_welcome(message):
    bot.reply_to(
        message,
        ("Hi there, I am EchoBot.\n" "I am here to echo your kind words back to you."),
    )


# Handle all other messages
@bot.message_handler(func=lambda message: True, content_types=["text"])
def echo_message(message):
    bot.reply_to(message, message.text)


# Remove webhook, it fails sometimes the set if there is a previous webhook
bot.remove_webhook()

# Set webhook
bot.set_webhook(
    url=WEBHOOK_URL_BASE + WEBHOOK_URL_PATH, certificate=open(WEBHOOK_SSL_CERT, "r")
)

# Disable CherryPy requests log
access_log = cherrypy.log.access_log
for handler in tuple(access_log.handlers):
    access_log.removeHandler(handler)

# Start cherrypy server
cherrypy.config.update(
    {
        "server.socket_host": WEBHOOK_LISTEN,
        "server.socket_port": WEBHOOK_PORT,
        "server.ssl_module": "builtin",
        "server.ssl_certificate": WEBHOOK_SSL_CERT,
        "server.ssl_private_key": WEBHOOK_SSL_PRIV,
    }
)

cherrypy.quickstart(WebhookServer(), WEBHOOK_URL_PATH, {"/": {}})
