# This file is part of the Trezor project.
#
# Copyright (C) 2012-2018 SatoshiLabs and contributors
#
# This library is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License version 3
# as published by the Free Software Foundation.
#
# This library 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 Lesser General Public License for more details.
#
# You should have received a copy of the License along with this library.
# If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.

import base64
import struct
import xdrlib

from . import messages as proto


def validate(transaction):
    if False in (k in transaction for k in ("Fee", "Sequence", "TransactionType", "Amount", "Destination")):
        raise ValueError("Some of the required fields missing (Fee, Sequence, TransactionType, Amount, Destination")
    if transaction["TransactionType"] != "Payment":
        raise ValueError("Only Payment transaction type is supported")


def create_sign_tx(transaction) -> proto.RippleSignTx:
    msg = proto.RippleSignTx()
    msg.fee = transaction["Fee"]
    msg.sequence = transaction["Sequence"]
    if "Flags" in transaction:
        msg.flags = transaction["Flags"]
    if "LastLedgerSequence" in transaction:
        msg.last_ledger_sequence = transaction["LastLedgerSequence"]

    msg.payment = create_payment(transaction)
    return msg


def create_payment(transaction) -> proto.RipplePayment:
    msg = proto.RipplePayment()
    msg.amount = transaction["Amount"]
    msg.destination = transaction["Destination"]
    return msg