# This file is part of the TREZOR project.
#
# Copyright (C) 2012-2016 Marek Palatinus <slush@satoshilabs.com>
# Copyright (C) 2012-2016 Pavol Rusnak <stick@satoshilabs.com>
#
# This library is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# 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 GNU Lesser General Public License
# along with this library.  If not, see <http://www.gnu.org/licenses/>.

from __future__ import print_function

import time
from . import common
import pytest
from trezorlib import messages as proto
from trezorlib.client import PinException, CallException

# FIXME TODO Add passphrase tests


@pytest.mark.skip_t2
class TestProtectCall(common.TrezorTest):

    def _some_protected_call(self, button, pin, passphrase):
        # This method perform any call which have protection in the device
        res = self.client.ping(
            'random data',
            button_protection=button,
            pin_protection=pin,
            passphrase_protection=passphrase
        )
        self.assertEqual(res, 'random data')

    """
    def test_expected_responses(self):
        self.setup_mnemonic_pin_passphrase()

        # This is low-level test of set_expected_responses()
        # feature of debugging client

        with self.client:
            # Scenario 1 - Received unexpected message
            self.client.set_expected_responses([])
            self.assertRaises(CallException, self._some_protected_call, True, True, True)

        with self.client:
            # Scenario 2 - Received other than expected message
            self.client.set_expected_responses([proto.Success()])
            self.assertRaises(CallException, self._some_protected_call, True, True, True)

        def scenario3():
            with self.client:
                # Scenario 3 - Not received expected message
                self.client.set_expected_responses([proto.ButtonRequest(),
                                                    proto.Success(),
                                                    proto.Success()])  # This is expected, but not received
                self._some_protected_call(True, False, False)
        self.assertRaises(Exception, scenario3)

        with self.client:
            # Scenario 4 - Received what expected
            self.client.set_expected_responses([proto.ButtonRequest(),
                                                proto.PinMatrixRequest(),
                                                proto.PassphraseRequest(),
                                                proto.Success(message='random data')])
            self._some_protected_call(True, True, True)

        def scenario5():
            with self.client:
                # Scenario 5 - Failed message by field filter
                self.client.set_expected_responses([proto.ButtonRequest(),
                                                    proto.Success(message='wrong data')])
                self._some_protected_call(True, True, True)
        self.assertRaises(CallException, scenario5)
    """

    def test_no_protection(self):
        self.setup_mnemonic_nopin_nopassphrase()

        with self.client:
            self.assertEqual(self.client.debug.read_pin()[0], None)
            self.client.set_expected_responses([proto.Success()])
            self._some_protected_call(False, True, True)

    def test_pin(self):
        self.setup_mnemonic_pin_passphrase()

        with self.client:
            self.assertEqual(self.client.debug.read_pin()[0], self.pin4)
            self.client.setup_debuglink(button=True, pin_correct=True)
            self.client.set_expected_responses([proto.ButtonRequest(),
                                                proto.PinMatrixRequest(),
                                                proto.Success()])
            self._some_protected_call(True, True, False)

    def test_incorrect_pin(self):
        self.setup_mnemonic_pin_passphrase()
        self.client.setup_debuglink(button=True, pin_correct=False)
        self.assertRaises(PinException, self._some_protected_call, False, True, False)

    def test_cancelled_pin(self):
        self.setup_mnemonic_pin_passphrase()
        self.client.setup_debuglink(button=True, pin_correct=False)  # PIN cancel
        self.assertRaises(PinException, self._some_protected_call, False, True, False)

    def test_exponential_backoff_with_reboot(self):
        self.setup_mnemonic_pin_passphrase()

        self.client.setup_debuglink(button=True, pin_correct=False)

        def test_backoff(attempts, start):
            if attempts <= 1:
                expected = 0
            else:
                expected = (2 ** (attempts - 1)) - 1
            got = round(time.time() - start, 2)

            msg = "Pin delay expected to be at least %s seconds, got %s" % (expected, got)
            print(msg)
            self.assertLessEqual(expected, got, msg)

        for attempt in range(1, 6):
            start = time.time()
            self.assertRaises(PinException, self._some_protected_call, False, True, False)
            test_backoff(attempt, start)