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

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

import logging
import time

import flask

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)

app = flask.Flask(__name__)


# Empty webserver index, return nothing, just http 200
@app.route("/", methods=["GET", "HEAD"])
def index():
    return ""


# Process webhook calls
@app.route(WEBHOOK_URL_PATH, methods=["POST"])
def webhook():
    if flask.request.headers.get("content-type") == "application/json":
        json_string = flask.request.get_data().decode("utf-8")
        update = telebot.types.Update.de_json(json_string)
        bot.process_new_updates([update])
        return ""
    else:
        flask.abort(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()

time.sleep(0.1)

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

# Start flask server
app.run(
    host=WEBHOOK_LISTEN,
    port=WEBHOOK_PORT,
    ssl_context=(WEBHOOK_SSL_CERT, WEBHOOK_SSL_PRIV),
    debug=True,
)
