# Copyright 2014 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.

import array
import struct

import common
from autotest_lib.client.cros.cellular.mbim_compliance import mbim_channel
from autotest_lib.client.cros.cellular.mbim_compliance import mbim_constants
from autotest_lib.client.cros.cellular.mbim_compliance import mbim_errors
from autotest_lib.client.cros.cellular.mbim_compliance \
        import mbim_message_request
from autotest_lib.client.cros.cellular.mbim_compliance \
        import mbim_message_response
from autotest_lib.client.cros.cellular.mbim_compliance \
        import mbim_test_base
from autotest_lib.client.cros.cellular.mbim_compliance.sequences \
        import get_descriptors_sequence
from autotest_lib.client.cros.cellular.mbim_compliance.sequences \
        import mbim_open_generic_sequence


class cellular_MbimComplianceCM08(mbim_test_base.MbimTestBase):
    """
    CM_08 Validation of InformationBuffer in case of a failure in
    MBIM_COMMAND_MSG.

    This test verifies that in case of a command failure the buffer in the
    MBIM_COMMAND_DONE response is empty.

    Reference:
        [1] Universal Serial Bus Communication Class MBIM Compliance Testing: 40
        http://www.usb.org/developers/docs/devclass_docs/MBIM-Compliance-1.0.pdf
    """
    version = 1

    def run_internal(self):
        """ Run CM_08 test. """
        # Precondition
        descriptors = get_descriptors_sequence.GetDescriptorsSequence(
                self.device_context).run()
        self.device_context.update_descriptor_cache(descriptors)
        mbim_open_generic_sequence.MBIMOpenGenericSequence(
                self.device_context).run()

        # Step 1
        device_context = self.device_context
        descriptor_cache = device_context.descriptor_cache
        command_message = mbim_message_request.MBIMCommand(
                device_service_id=mbim_constants.UUID_BASIC_CONNECT.bytes,
                cid=mbim_constants.MBIM_CID_RADIO_STATE,
                command_type=mbim_constants.COMMAND_TYPE_SET,
                information_buffer_length=4,
                payload_buffer=array.array('B', struct.pack('I', 2)))
        packets = mbim_message_request.generate_request_packets(
                command_message,
                device_context.max_control_transfer_size)
        channel = mbim_channel.MBIMChannel(
                device_context._device,
                descriptor_cache.mbim_communication_interface.bInterfaceNumber,
                descriptor_cache.interrupt_endpoint.bEndpointAddress,
                device_context.max_control_transfer_size)
        response_packets = channel.bidirectional_transaction(*packets)
        channel.close()

        # Step 2
        response_message = mbim_message_response.parse_response_packets(
                response_packets)

        # Step 3
        if ((response_message.message_type !=
             mbim_constants.MBIM_COMMAND_DONE) or
            (response_message.status_codes ==
             mbim_constants.MBIM_STATUS_SUCCESS) or
            response_message.information_buffer_length != 0):
            mbim_errors.log_and_raise(mbim_errors.MBIMComplianceAssertionError,
                                      'mbim1.0:9.4.5#3')