# Lint as: python2, python3
# Copyright 2020 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""A class provides most of the test logic for Bluetooth Better Together"""

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function

import logging
import base64
import json

import common
from autotest_lib.server.cros.bluetooth.bluetooth_adapter_quick_tests import (
        BluetoothAdapterQuickTests)
from autotest_lib.server.cros.bluetooth.bluetooth_adapter_pairing_tests import (
        BluetoothAdapterPairingTests)
from autotest_lib.server.cros.bluetooth.bluetooth_adapter_tests import (
        test_retry_and_log)
from six.moves import range

class BluetoothAdapterBetterTogether(BluetoothAdapterQuickTests,
                                        BluetoothAdapterPairingTests):
  """A Batch of Bluetooth LE tests for Better Together. This test is written
     as a batch of tests in order to reduce test time, since auto-test ramp up
     time is costly. The batch is using BluetoothAdapterQuickTests wrapper
     methods to start and end a test and a batch of tests.

     This class can be called to run the entire test batch or to run a
     specific test only
  """

  BETTER_TOGETHER_SERVICE_UUID = 'b3b7e28e-a000-3e17-bd86-6e97b9e28c11'
  CLIENT_RX_CHARACTERISTIC_UUID = '00000100-0004-1000-8000-001a11000102'
  CLIENT_TX_CHARACTERISTIC_UUID = '00000100-0004-1000-8000-001a11000101'
  CCCD_VALUE_INDICATION = 0x02
  TEST_ITERATION = 3

  # The following messages were captured during a smart unlock process. These
  # are the messages exchanged between the phone and the chromebook to
  # authorize each other in order to unlock the chromebook.
  CONNECTION_OPEN_MESSAGE = b'\x80\x00\x01\x00\x01\x00\x00'
  MESSAGE_1 = b'\x1c\x03\x00\xc7\x7b\x22\x66\x65\x61\x74\x75\x72' \
              b'\x65\x22\x3a\x22\x61\x75\x74\x68\x22\x2c\x22\x70' \
              b'\x61\x79\x6c\x6f\x61\x64\x22\x3a\x22\x43\x6c\x6b' \
              b'\x4b\x56\x41\x67\x42\x45\x41\x45\x79\x54\x67\x70' \
              b'\x4b\x43\x41\x45\x53\x52\x67\x6f\x68\x41\x49\x37' \
              b'\x6e\x78\x63\x34\x6b\x44\x4d\x68\x6d\x68\x6e\x4d' \
              b'\x75\x69\x7a\x79\x62\x47\x54\x5f\x31\x4e\x6c\x52' \
              b'\x4c\x6c\x6d\x32\x59\x34\x72\x35\x78\x6f\x6e\x69' \
              b'\x47\x51\x35\x49\x6a\x45\x69\x45\x41\x75\x45\x64' \
              b'\x43\x4c\x37\x36\x44\x70\x30\x70\x6a\x6a\x75\x74' \
              b'\x56\x6a\x47\x35\x38\x62\x55\x49\x57\x42\x57\x49' \
              b'\x41\x4f\x5a\x39\x38\x46\x43\x49\x4f\x79\x58\x68' \
              b'\x2d\x6b\x66\x6f\x51\x41\x52\x49\x42\x72\x68\x49' \
              b'\x67\x7a\x35\x62\x49\x37\x53\x6f\x59\x47\x56\x36' \
              b'\x6b\x4e\x4e\x74\x6d\x73\x59\x53\x6a\x75\x68\x4d' \
              b'\x68\x61\x66\x51\x6c\x4d\x44\x55\x68\x78\x42\x36' \
              b'\x44\x50\x52\x79\x4c\x5a\x62\x30\x3d\x22\x7d'

  MESSAGE_2 = b'\x2c\x03\x00\xfb\x7b\x22\x66\x65\x61\x74\x75\x72' \
              b'\x65\x22\x3a\x22\x61\x75\x74\x68\x22\x2c\x22\x70' \
              b'\x61\x79\x6c\x6f\x61\x64\x22\x3a\x22\x43\x6f\x41' \
              b'\x42\x43\x68\x77\x49\x41\x52\x41\x43\x4b\x68\x43' \
              b'\x34\x69\x38\x45\x47\x73\x76\x71\x6e\x78\x5f\x66' \
              b'\x66\x4c\x33\x59\x42\x61\x6b\x35\x59\x4d\x67\x51' \
              b'\x49\x44\x52\x41\x42\x45\x6d\x42\x41\x71\x5f\x47' \
              b'\x62\x72\x49\x42\x6c\x42\x42\x76\x73\x6a\x73\x32' \
              b'\x67\x47\x56\x59\x70\x76\x73\x50\x6f\x64\x57\x6e' \
              b'\x70\x50\x42\x6e\x5a\x71\x41\x61\x46\x6b\x30\x59' \
              b'\x54\x48\x76\x79\x6b\x55\x76\x6b\x4a\x79\x6c\x35' \
              b'\x56\x54\x7a\x48\x53\x35\x43\x6e\x41\x65\x56\x4d' \
              b'\x79\x38\x49\x76\x44\x5f\x67\x65\x6d\x4e\x65\x42' \
              b'\x61\x76\x58\x70\x70\x52\x62\x4b\x43\x42\x34\x5f' \
              b'\x35\x35\x79\x4a\x50\x4e\x6b\x5f\x76\x45\x66\x53' \
              b'\x38\x57\x5a\x7a\x6d\x58\x64\x5a\x4d\x68\x72\x74' \
              b'\x31\x61\x6d\x67\x46\x7a\x6e\x35\x4b\x65\x61\x2d' \
              b'\x77\x5f\x58\x55\x53\x49\x47\x54\x6e\x55\x33\x6d' \
              b'\x68\x45\x36\x67\x63\x5a\x4c\x4b\x49\x52\x79\x4d' \
              b'\x61\x39\x68\x78\x41\x4f\x30\x4b\x6f\x7a\x6d\x68' \
              b'\x43\x71\x6d\x4d\x42\x54\x4a\x6e\x57\x4e\x6f\x52' \
              b'\x62\x22\x7d'

  MESSAGE_3 = b'\x3c\x03\x00\xae\x7b\x22\x66\x65\x61\x74\x75\x72' \
              b'\x65\x22\x3a\x22\x65\x61\x73\x79\x5f\x75\x6e\x6c' \
              b'\x6f\x63\x6b\x22\x2c\x22\x70\x61\x79\x6c\x6f\x61' \
              b'\x64\x22\x3a\x22\x43\x6b\x41\x4b\x48\x41\x67\x42' \
              b'\x45\x41\x49\x71\x45\x44\x30\x72\x52\x69\x54\x77' \
              b'\x32\x41\x6e\x6e\x5f\x5f\x5f\x59\x33\x6c\x68\x55' \
              b'\x53\x65\x45\x79\x42\x41\x67\x4e\x45\x41\x45\x53' \
              b'\x49\x46\x59\x61\x64\x36\x33\x43\x75\x52\x34\x67' \
              b'\x37\x77\x4d\x41\x4b\x61\x65\x76\x2d\x72\x7a\x38' \
              b'\x66\x64\x6f\x47\x46\x2d\x67\x44\x4c\x6a\x37\x50' \
              b'\x47\x62\x43\x6f\x57\x54\x66\x6f\x45\x69\x43\x38' \
              b'\x4a\x56\x62\x4c\x48\x75\x49\x35\x42\x76\x38\x43' \
              b'\x4c\x74\x73\x53\x51\x35\x50\x4c\x6e\x72\x5a\x41' \
              b'\x70\x68\x6b\x75\x4c\x78\x2d\x56\x59\x64\x6c\x32' \
              b'\x53\x4d\x71\x5f\x36\x41\x3d\x3d\x22\x7d'

  MESSAGE_4 = b'\x4c\x03\x00\xc2\x7b\x22\x66\x65\x61\x74\x75\x72' \
              b'\x65\x22\x3a\x22\x65\x61\x73\x79\x5f\x75\x6e\x6c' \
              b'\x6f\x63\x6b\x22\x2c\x22\x70\x61\x79\x6c\x6f\x61' \
              b'\x64\x22\x3a\x22\x43\x6c\x41\x4b\x48\x41\x67\x42' \
              b'\x45\x41\x49\x71\x45\x4d\x61\x4e\x6c\x75\x43\x56' \
              b'\x63\x72\x59\x37\x68\x70\x34\x68\x46\x74\x69\x6f' \
              b'\x45\x4d\x6b\x79\x42\x41\x67\x4e\x45\x41\x45\x53' \
              b'\x4d\x47\x6c\x68\x33\x55\x68\x44\x77\x58\x4b\x70' \
              b'\x58\x46\x5f\x5a\x6e\x4f\x61\x30\x36\x4a\x48\x4b' \
              b'\x69\x6b\x56\x68\x51\x62\x32\x50\x4d\x36\x62\x62' \
              b'\x76\x78\x51\x6a\x47\x50\x47\x73\x66\x79\x42\x5a' \
              b'\x74\x52\x67\x39\x5f\x65\x36\x6f\x42\x5a\x79\x5f' \
              b'\x74\x35\x42\x45\x74\x78\x49\x67\x51\x75\x37\x42' \
              b'\x62\x6e\x75\x4e\x57\x64\x67\x6d\x42\x36\x4d\x47' \
              b'\x75\x68\x54\x79\x34\x33\x43\x37\x32\x2d\x58\x44' \
              b'\x58\x35\x4b\x4f\x6a\x67\x6d\x56\x74\x48\x58\x41' \
              b'\x68\x4e\x67\x3d\x22\x7d'

  CONNECTION_CLOSE_MESSAGE = b'\xd2\x00\x00'

  def test_smart_unlock(self, address):
    """Simulate the Smart Unlock flow, here are the steps that involve
       1. Set the discovery filter to match LE devices only.
       2. Start the discovery.
       3. Stop the discovery after the device was found.
       4. Set the LE connection parameters to reduce the min and max
          connection intervals to 6.
       5. Connect the device.
       6. Set the Trusted property of the device to true.
       7. Verify all the services were resolved.
       8. Start notification on the RX characteristic of the
           Proximity Service.
       9. Exchange some messages with the peer device to authorize it.
       10. Stop the notification.
       11. Disconnect the device.
    """

    filter = {'Transport':'le'}
    parameters = {'MinimumConnectionInterval':6,
                  'MaximumConnectionInterval':6}

    # We don't use the control file for iteration since it will involve the
    # device setup steps which don't reflect the real user scenario.
    for i in range(self.TEST_ITERATION):
      logging.debug("Test iteration %d", i)
      self.test_set_discovery_filter(filter)
      self.test_discover_device(address)

      self.test_set_le_connection_parameters(address, parameters)
      self.test_connection_by_adapter(address)

      self.test_set_trusted(address)
      self.test_service_resolved(address)
      self.test_find_object_path(address)

      self.test_start_notify(self.rx_object_path,
                             self.CCCD_VALUE_INDICATION)
      self.test_messages_exchange(
          self.rx_object_path, self.tx_object_path, address)
      self.test_stop_notify(self.rx_object_path)
      self.test_disconnection_by_adapter(address)

      self.test_remove_device_object(address)

    return True


  @test_retry_and_log(False)
  def test_remove_device_object(self, address):
    """Test the device object can be removed from the adapter"""
    return self.bluetooth_facade.remove_device_object(address)


  @test_retry_and_log(False)
  def test_find_object_path(self, address):
    """Test the object path can be found for a device"""
    self.tx_object_path = None
    self.rx_object_path = None
    attr_map = self.bluetooth_facade.get_gatt_attributes_map(address)
    attr_map_json = json.loads(attr_map)
    servs_json = attr_map_json['services']
    for uuid_s in servs_json:
      if uuid_s == self.BETTER_TOGETHER_SERVICE_UUID:
        chrcs_json = servs_json[uuid_s]['characteristics']
        for uuid_c in chrcs_json:
          if uuid_c == self.CLIENT_TX_CHARACTERISTIC_UUID:
            self.tx_object_path = chrcs_json[uuid_c]['path']
          if uuid_c == self.CLIENT_RX_CHARACTERISTIC_UUID:
            self.rx_object_path = chrcs_json[uuid_c]['path']

    return self.tx_object_path and self.rx_object_path


  @test_retry_and_log(False)
  def test_messages_exchange(
      self, rx_object_path, tx_object_path, address):
    """Test message exchange with the peer, Better Together performs the
       messages exchange for authorizing the peer device before unlocking
       the Chromebook.
    """
    if rx_object_path is None or tx_object_path is None:
        logging.error('Invalid object path')
        return False

    self.test_message_exchange(
        rx_object_path,
        tx_object_path,
        self.CONNECTION_OPEN_MESSAGE,
        'connection open message')

    self.test_message_exchange(
        rx_object_path,
        tx_object_path,
        self.MESSAGE_1,
        'message 1')

    self.test_message_exchange(
        rx_object_path,
        tx_object_path,
        self.MESSAGE_2,
        'message 2')

    # Better Together gets connection info multiple times to ensure
    # the device is close enough by checking the RSSI, here we simulate it.
    for i in range(9):
      self.test_get_connection_info(address)

    self.test_message_exchange(
        rx_object_path,
        tx_object_path,
        self.MESSAGE_3,
        'message 3')

    self.test_message_exchange(
        rx_object_path,
        tx_object_path,
        self.MESSAGE_4,
        'message 4')

    for i in range(2):
      self.test_get_connection_info(address)

    self.test_message_exchange(
        rx_object_path,
        tx_object_path,
        self.CONNECTION_CLOSE_MESSAGE,
        'connection close message')

    return True


  @test_retry_and_log(False)
  def test_message_exchange(
      self, rx_object_path, tx_object_path, message, message_type):
    """Test message exchange between DUT and the peer device"""
    ret_msg = self.bluetooth_facade.exchange_messages(
        tx_object_path, rx_object_path, message)

    if not ret_msg:
      logging.error("Failed to write message: %s", message_type)
      return False

    return base64.standard_b64decode(ret_msg) == message