# Copyright 2015-2016 Yelp Inc.
#
# 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
#
#     http://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.
import docker
import mock
import pytest

from paasta_tools.paasta_execute_docker_command import execute_in_container
from paasta_tools.paasta_execute_docker_command import main
from paasta_tools.paasta_execute_docker_command import TimeoutException


def test_execute_in_container():
    fake_container_id = "fake_container_id"
    fake_return_code = 0
    fake_output = "fake_output"
    fake_command = "fake_cmd"
    mock_docker_client = mock.MagicMock(spec_set=docker.Client)
    mock_docker_client.exec_start.return_value = fake_output
    mock_docker_client.exec_inspect.return_value = {"ExitCode": fake_return_code}

    assert execute_in_container(
        mock_docker_client, fake_container_id, fake_command, 1
    ) == (fake_output, fake_return_code)
    expected_cmd = ["/bin/sh", "-c", fake_command]
    mock_docker_client.exec_create.assert_called_once_with(
        fake_container_id, expected_cmd
    )


def test_execute_in_container_reuses_exec():
    fake_container_id = "fake_container_id"
    fake_execid = "fake_execid"
    fake_return_code = 0
    fake_output = "fake_output"
    fake_command = "fake_cmd"
    mock_docker_client = mock.MagicMock(spec_set=docker.Client)
    mock_docker_client.inspect_container.return_value = {"ExecIDs": [fake_execid]}
    mock_docker_client.exec_start.return_value = fake_output
    mock_docker_client.exec_inspect.return_value = {
        "ExitCode": fake_return_code,
        "ProcessConfig": {"entrypoint": "/bin/sh", "arguments": ["-c", fake_command]},
    }

    assert execute_in_container(
        mock_docker_client, fake_container_id, fake_command, 1
    ) == (fake_output, fake_return_code)
    assert mock_docker_client.exec_create.call_count == 0
    mock_docker_client.exec_start.assert_called_once_with(fake_execid, stream=False)


def test_execute_in_container_reuses_only_valid_exec():
    fake_container_id = "fake_container_id"
    fake_execid = "fake_execid"
    fake_return_code = 0
    fake_output = "fake_output"
    fake_command = "fake_cmd"
    bad_exec = {
        "ExitCode": fake_return_code,
        "ProcessConfig": {
            "entrypoint": "/bin/sh",
            "arguments": ["-c", "some_other_command"],
        },
    }
    good_exec = {
        "ExitCode": fake_return_code,
        "ProcessConfig": {"entrypoint": "/bin/sh", "arguments": ["-c", fake_command]},
    }
    mock_docker_client = mock.MagicMock(spec_set=docker.Client)
    mock_docker_client.inspect_container.return_value = {
        "ExecIDs": ["fake_other_exec", fake_execid, "fake_other_exec"]
    }
    mock_docker_client.exec_start.return_value = fake_output
    # the last side effect is used to check the exit code of the command
    mock_docker_client.exec_inspect.side_effect = [
        bad_exec,
        good_exec,
        bad_exec,
        good_exec,
    ]

    assert execute_in_container(
        mock_docker_client, fake_container_id, fake_command, 1
    ) == (fake_output, fake_return_code)
    assert mock_docker_client.exec_create.call_count == 0
    mock_docker_client.exec_start.assert_called_once_with(fake_execid, stream=False)


def test_main():
    fake_container_id = "fake_container_id"
    fake_timeout = 3
    with mock.patch(
        "paasta_tools.paasta_execute_docker_command.get_container_id_for_mesos_id",
        return_value=fake_container_id,
        autospec=True,
    ), mock.patch(
        "paasta_tools.paasta_execute_docker_command.parse_args", autospec=True
    ) as args_patch, mock.patch(
        "paasta_tools.paasta_execute_docker_command.execute_in_container",
        return_value=("fake_output", 0),
        autospec=True,
    ), mock.patch(
        "paasta_tools.paasta_execute_docker_command.time_limit", autospec=True
    ) as time_limit_patch:
        args_patch.return_value.mesos_id = "fake_task_id"
        args_patch.return_value.timeout = fake_timeout
        with pytest.raises(SystemExit) as excinfo:
            main()
        time_limit_patch.assert_called_once_with(fake_timeout)
        assert excinfo.value.code == 0


def test_main_with_empty_task_id():
    fake_container_id = "fake_container_id"
    fake_timeout = 3
    with mock.patch(
        "paasta_tools.paasta_execute_docker_command.get_container_id_for_mesos_id",
        return_value=fake_container_id,
        autospec=True,
    ), mock.patch(
        "paasta_tools.paasta_execute_docker_command.parse_args", autospec=True
    ) as args_patch, mock.patch(
        "paasta_tools.paasta_execute_docker_command.execute_in_container",
        return_value=("fake_output", 0),
        autospec=True,
    ), mock.patch(
        "paasta_tools.paasta_execute_docker_command.time_limit", autospec=True
    ):
        args_patch.return_value.mesos_id = ""
        args_patch.return_value.timeout = fake_timeout
        with pytest.raises(SystemExit) as excinfo:
            main()
        assert excinfo.value.code == 2


def test_main_container_not_found_failure():
    with mock.patch(
        "paasta_tools.paasta_execute_docker_command.get_container_id_for_mesos_id",
        return_value=None,
        autospec=True,
    ), mock.patch(
        "paasta_tools.paasta_execute_docker_command.execute_in_container",
        return_value=("fake_output", 2),
        autospec=True,
    ), mock.patch(
        "paasta_tools.paasta_execute_docker_command.parse_args", autospec=True
    ) as args_patch, mock.patch(
        "paasta_tools.paasta_execute_docker_command.time_limit", autospec=True
    ):
        args_patch.return_value.mesos_id = "fake_task_id"
        with pytest.raises(SystemExit) as excinfo:
            main()
        assert excinfo.value.code == 1


def test_main_cmd_unclean_exit_failure():
    fake_container_id = "fake_container_id"
    with mock.patch(
        "paasta_tools.paasta_execute_docker_command.get_container_id_for_mesos_id",
        return_value=fake_container_id,
        autospec=True,
    ), mock.patch(
        "paasta_tools.paasta_execute_docker_command.execute_in_container",
        return_value=("fake_output", 2),
        autospec=True,
    ), mock.patch(
        "paasta_tools.paasta_execute_docker_command.parse_args", autospec=True
    ) as args_patch, mock.patch(
        "paasta_tools.paasta_execute_docker_command.time_limit", autospec=True
    ):
        args_patch.return_value.mesos_id = "fake_task_id"
        with pytest.raises(SystemExit) as excinfo:
            main()
        assert excinfo.value.code == 2


def test_main_timeout_failure():
    fake_container_id = "fake_container_id"
    fake_timeout = 3
    with mock.patch(
        "paasta_tools.paasta_execute_docker_command.get_container_id_for_mesos_id",
        return_value=fake_container_id,
        autospec=True,
    ), mock.patch(
        "paasta_tools.paasta_execute_docker_command.parse_args", autospec=True
    ) as args_patch, mock.patch(
        "paasta_tools.paasta_execute_docker_command.execute_in_container",
        return_value=("fake_output", 0),
        autospec=True,
    ), mock.patch(
        "paasta_tools.paasta_execute_docker_command.time_limit",
        side_effect=TimeoutException,
        autospec=True,
    ) as time_limit_patch:
        args_patch.return_value.mesos_id = "fake_task_id"
        args_patch.return_value.timeout = fake_timeout
        with pytest.raises(SystemExit) as excinfo:
            main()
        time_limit_patch.assert_called_once_with(fake_timeout)
        assert excinfo.value.code == 1
