#!/usr/bin/env python
# -*- coding: utf-8 -*-
#
"""Basic example for a bot that can receive payment from user.

This program is dedicated to the public domain under the CC0 license.
"""

from telegram import (LabeledPrice, ShippingOption)
from telegram.ext import (Updater, CommandHandler, MessageHandler,
                          Filters, PreCheckoutQueryHandler, ShippingQueryHandler)
import logging

# Enable logging
logging.basicConfig(format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
                    level=logging.INFO)

logger = logging.getLogger(__name__)


def error(bot, update, error):
    """Log Errors caused by Updates."""
    logger.warning('Update "%s" caused error "%s"', update, error)


def start_callback(bot, update):
    msg = "Use /shipping to get an invoice for shipping-payment, "
    msg += "or /noshipping for an invoice without shipping."
    update.message.reply_text(msg)


def start_with_shipping_callback(bot, update):
    chat_id = update.message.chat_id
    title = "Payment Example"
    description = "Payment Example using python-telegram-bot"
    # select a payload just for you to recognize its the donation from your bot
    payload = "Custom-Payload"
    # In order to get a provider_token see https://core.telegram.org/bots/payments#getting-a-token
    provider_token = "PROVIDER_TOKEN"
    start_parameter = "test-payment"
    currency = "USD"
    # price in dollars
    price = 1
    # price * 100 so as to include 2 d.p.
    # check https://core.telegram.org/bots/payments#supported-currencies for more details
    prices = [LabeledPrice("Test", price * 100)]

    # optionally pass need_name=True, need_phone_number=True,
    # need_email=True, need_shipping_address=True, is_flexible=True
    bot.sendInvoice(chat_id, title, description, payload,
                    provider_token, start_parameter, currency, prices,
                    need_name=True, need_phone_number=True,
                    need_email=True, need_shipping_address=True, is_flexible=True)


def start_without_shipping_callback(bot, update):
    chat_id = update.message.chat_id
    title = "Payment Example"
    description = "Payment Example using python-telegram-bot"
    # select a payload just for you to recognize its the donation from your bot
    payload = "Custom-Payload"
    # In order to get a provider_token see https://core.telegram.org/bots/payments#getting-a-token
    provider_token = "PROVIDER_TOKEN"
    start_parameter = "test-payment"
    currency = "USD"
    # price in dollars
    price = 1
    # price * 100 so as to include 2 d.p.
    prices = [LabeledPrice("Test", price * 100)]

    # optionally pass need_name=True, need_phone_number=True,
    # need_email=True, need_shipping_address=True, is_flexible=True
    bot.sendInvoice(chat_id, title, description, payload,
                    provider_token, start_parameter, currency, prices)


def shipping_callback(bot, update):
    query = update.shipping_query
    # check the payload, is this from your bot?
    if query.invoice_payload != 'Custom-Payload':
        # answer False pre_checkout_query
        bot.answer_shipping_query(shipping_query_id=query.id, ok=False,
                                  error_message="Something went wrong...")
        return
    else:
        options = list()
        # a single LabeledPrice
        options.append(ShippingOption('1', 'Shipping Option A', [LabeledPrice('A', 100)]))
        # an array of LabeledPrice objects
        price_list = [LabeledPrice('B1', 150), LabeledPrice('B2', 200)]
        options.append(ShippingOption('2', 'Shipping Option B', price_list))
        bot.answer_shipping_query(shipping_query_id=query.id, ok=True,
                                  shipping_options=options)


# after (optional) shipping, it's the pre-checkout
def precheckout_callback(bot, update):
    query = update.pre_checkout_query
    # check the payload, is this from your bot?
    if query.invoice_payload != 'Custom-Payload':
        # answer False pre_checkout_query
        bot.answer_pre_checkout_query(pre_checkout_query_id=query.id, ok=False,
                                      error_message="Something went wrong...")
    else:
        bot.answer_pre_checkout_query(pre_checkout_query_id=query.id, ok=True)


# finally, after contacting to the payment provider...
def successful_payment_callback(bot, update):
    # do something after successful receive of payment?
    update.message.reply_text("Thank you for your payment!")


def main():
    # Create the EventHandler and pass it your bot's token.
    updater = Updater(token="BOT_TOKEN")

    # Get the dispatcher to register handlers
    dp = updater.dispatcher

    # simple start function
    dp.add_handler(CommandHandler("start", start_callback))

    # Add command handler to start the payment invoice
    dp.add_handler(CommandHandler("shipping", start_with_shipping_callback))
    dp.add_handler(CommandHandler("noshipping", start_without_shipping_callback))

    # Optional handler if your product requires shipping
    dp.add_handler(ShippingQueryHandler(shipping_callback))

    # Pre-checkout handler to final check
    dp.add_handler(PreCheckoutQueryHandler(precheckout_callback))

    # Success! Notify your user!
    dp.add_handler(MessageHandler(Filters.successful_payment, successful_payment_callback))

    # log all errors
    dp.add_error_handler(error)

    # Start the Bot
    updater.start_polling()

    # Run the bot until you press Ctrl-C or the process receives SIGINT,
    # SIGTERM or SIGABRT. This should be used most of the time, since
    # start_polling() is non-blocking and will stop the bot gracefully.
    updater.idle()


if __name__ == '__main__':
    main()