#! /usr/bin/env python3

"""
#   PinPadWriteDisplay.py: display a text on a pinpad
#   Copyright (C) 2021  Ludovic Rousseau
"""

#   This program 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 of the License, or
#   (at your option) any later version.
#
#   This program 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 this program; if not, see <http://www.gnu.org/licenses/>.

from smartcard.System import readers
from smartcard.pcsc.PCSCPart10 import (SCARD_SHARE_DIRECT,
    SCARD_LEAVE_CARD, FEATURE_CCID_ESC_COMMAND,
    getFeatureRequest, hasFeature)

reader = readers()[0]
print("Using reader:", reader)

cardConnection = reader.createConnection()
cardConnection.connect(mode=SCARD_SHARE_DIRECT,
    disposition=SCARD_LEAVE_CARD)

feature_list = getFeatureRequest(cardConnection)
ccid_esc_command = hasFeature(feature_list, FEATURE_CCID_ESC_COMMAND)
if ccid_esc_command is None:
    raise Exception("FEATURE_CCID_ESC_COMMAND is not supported or allowed")

clear_screen = [0xB6]
res = cardConnection.control(ccid_esc_command, clear_screen)
print(res)

set_text = [0x68] + list(map(ord, "0123456789ABCDEF0123456789ABCDEF"))
print(set_text)
res = cardConnection.control(ccid_esc_command, set_text)
print(res)