##
# This file is part of TALER
# (C) 2014, 2015, 2016 Taler Systems SA
#
# TALER is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published
# by the Free Software Foundation; either version 3, or (at your
# option) any later version.
#
# TALER is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public
# License along with TALER; see the file COPYING.  If not, see
# <http://www.gnu.org/licenses/>
#
# @author Marcello Stanisci
# @brief CLI utility to make wire transfers.

import sys
import logging
import json
from django.core.management.base import BaseCommand
from django.contrib.auth import authenticate
from taler.util.amount import Amount, AmountFormatError
from taler.util.payto import PaytoParse, PaytoFormatError
from ...views import wire_transfer, User
from ...models import BankAccount, BankTransaction

LOGGER = logging.getLogger(__name__)


##
# Django-specific definition to register the CLI utility.
class Command(BaseCommand):
    help = "Wire transfer money and return the transaction id."

    ##
    # Register the command line options of this command.
    #
    # @param self this object.
    # @param parser API used to actually register the option.
    def add_arguments(self, parser):
        parser.add_argument(
            "user",
            type=str,
            metavar="USERNAME",
            help="Which user is performing the wire transfer",
        )
        parser.add_argument(
            "password", type=str, metavar="PASSWORD", help="Performing user's password."
        )
        parser.add_argument(
            "payto-credit-account-with-subject",
            type=str,
            metavar="PAYTO-CREDIT-ACCOUNT-WITH-SUBJECT",
            help="Which account will receive money, in the form 'payto://x-taler-bank/[bank-host/]CreditAccountName?subject=PaymentSubject'.",
        )
        parser.add_argument(
            "amount",
            type=str,
            metavar="AMOUNT",
            help="Wire transfer's amount, given in the " "CURRENCY:X.Y form.",
        )

    ##
    # This callable gets invoked when the user invokes the
    # CLI utility; it is responsible of making the wire transfer
    # effective.
    #
    # @param self this object.
    # @param args arguments list -- currently unused.
    # @param options options given by the user at the command line.
    def handle(self, *args, **options):
        user = authenticate(username=options["user"], password=options["password"])
        if not user:
            LOGGER.error("Wrong user/password.")
            sys.exit(1)
        try:
            amount = Amount.parse(options["amount"])
        except AmountFormatError:
            print("Amount format is wrong: respect C:X.Y.")
            sys.exit(1)
        try:
            parsed_payto = PaytoParse(options["payto-credit-account-with-subject"])
            credit_account_user = User.objects.get(username=parsed_payto.target)
            credit_account = credit_account_user.bankaccount
        except User.DoesNotExist:
            print("Credit account does not exist.")
            sys.exit(1)
        except PaytoFormatError as e:
            print(e)
            sys.exit(1)
        if not parsed_payto.message:
            print("Please provide 'message' parameter along the payto URI")
            sys.exit(1)
        try:
            transaction = wire_transfer(
                amount, user.bankaccount, credit_account, parsed_payto.message
            )
            print("Transaction id: " + str(transaction.id))
        except Exception as exc:
            LOGGER.error(exc)
            sys.exit(1)