#!/usr/bin/env python3
# Copyright 2022 The Pigweed Authors
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may not
# use this file except in compliance with the License. You may obtain a copy of
# the License at
#
#     https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations under
# the License.
"""Cross-language pw_transfer tests that take several seconds each.

Usage:

   bazel run pw_transfer/integration_test:cross_language_medium_write_test

Command-line arguments must be provided after a double-dash:

   bazel run pw_transfer/integration_test:cross_language_medium_write_test -- \
       --server-port 3304

Which tests to run can be specified as command-line arguments:

  bazel run pw_transfer/integration_test:cross_language_medium_write_test -- \
      MediumTransferWriteIntegrationTest.test_medium_client_write_1_java

"""

import itertools
from parameterized import parameterized
import random

from google.protobuf import text_format

from pigweed.pw_transfer.integration_test import config_pb2
import test_fixture
from test_fixture import TransferIntegrationTestHarness, TransferConfig

_ALL_LANGUAGES = ("cpp", "java", "python")
_ALL_VERSIONS = (
    config_pb2.TransferAction.ProtocolVersion.V1,
    config_pb2.TransferAction.ProtocolVersion.V2,
)
_ALL_LANGUAGES_AND_VERSIONS = tuple(
    itertools.product(_ALL_LANGUAGES, _ALL_VERSIONS)
)


class MediumTransferWriteIntegrationTest(test_fixture.TransferIntegrationTest):
    # Each set of transfer tests uses a different client/server port pair to
    # allow tests to be run in parallel.
    HARNESS_CONFIG = TransferIntegrationTestHarness.Config(
        server_port=3316, client_port=3317
    )

    @parameterized.expand(_ALL_LANGUAGES_AND_VERSIONS)
    def test_medium_client_write(self, client_type, protocol_version):
        payload = random.Random(67336391945).randbytes(512)
        config = self.default_config()
        resource_id = 5
        self.do_single_write(
            client_type, config, resource_id, payload, protocol_version
        )

    @parameterized.expand(_ALL_LANGUAGES_AND_VERSIONS)
    def test_large_hdlc_escape_client_write(
        self, client_type, protocol_version
    ):
        # Use bytes that will be escaped by HDLC to ensure transfer over a
        # HDLC channel doesn't cause frame corruption due to insufficient
        # buffer space. ~10KB is relatively arbitrary, but is to ensure that
        # more than a small handful of packets are sent between the server
        # and client.
        payload = b"~" * 98731
        config = self.default_config()
        resource_id = 5
        self.do_single_write(
            client_type, config, resource_id, payload, protocol_version
        )

    @parameterized.expand(_ALL_LANGUAGES_AND_VERSIONS)
    def test_pattern_drop_client_write(self, client_type, protocol_version):
        """Drops packets with an alternating pattern."""
        payload = random.Random(67336391945).randbytes(1234)
        config = TransferConfig(
            self.default_server_config(),
            self.default_client_config(),
            text_format.Parse(
                """
                client_filter_stack: [
                    { hdlc_packetizer: {} },
                    { keep_drop_queue: {keep_drop_queue: [5, 1]} }
                ]

                server_filter_stack: [
                    { hdlc_packetizer: {} },
                    { keep_drop_queue: {keep_drop_queue: [5, 1]} }
            ]""",
                config_pb2.ProxyConfig(),
            ),
        )
        # Resource ID is arbitrary, but deliberately set to be >1 byte.
        resource_id = 1337

        # This test deliberately causes flakes during the opening handshake of
        # a transfer, so allow the resource_id of this transfer to be reused
        # multiple times.
        self.do_single_write(
            client_type,
            config,
            resource_id,
            payload,
            protocol_version,
            permanent_resource_id=True,
        )

    @parameterized.expand(_ALL_LANGUAGES_AND_VERSIONS)
    def test_parameter_drop_client_write(self, client_type, protocol_version):
        """Drops the first few transfer initialization packets."""
        payload = random.Random(67336391945).randbytes(1234)
        config = TransferConfig(
            self.default_server_config(),
            self.default_client_config(),
            text_format.Parse(
                """
                client_filter_stack: [
                    { hdlc_packetizer: {} },
                    { keep_drop_queue: {keep_drop_queue: [2, 1, -1]} }
                ]

                server_filter_stack: [
                    { hdlc_packetizer: {} },
                    { keep_drop_queue: {keep_drop_queue: [1, 2, -1]} }
            ]""",
                config_pb2.ProxyConfig(),
            ),
        )
        # Resource ID is arbitrary, but deliberately set to be >2 bytes.
        resource_id = 597419
        self.do_single_write(
            client_type, config, resource_id, payload, protocol_version
        )


if __name__ == '__main__':
    test_fixture.run_tests_for(MediumTransferWriteIntegrationTest)