"""The tests for the Shell command component."""
import asyncio
import os
import tempfile
import unittest
from typing import Tuple
from unittest.mock import Mock, patch

from homeassistant.setup import setup_component
from homeassistant.components import shell_command

from tests.common import get_test_home_assistant


@asyncio.coroutine
def mock_process_creator(error: bool = False) -> asyncio.coroutine:
    """Mock a coroutine that creates a process when yielded."""
    @asyncio.coroutine
    def communicate() -> Tuple[bytes, bytes]:
        """Mock a coroutine that runs a process when yielded.

        Returns a tuple of (stdout, stderr).
        """
        return b"I am stdout", b"I am stderr"

    mock_process = Mock()
    mock_process.communicate = communicate
    mock_process.returncode = int(error)
    return mock_process


class TestShellCommand(unittest.TestCase):
    """Test the shell_command component."""

    def setUp(self):  # pylint: disable=invalid-name
        """Set up things to be run when tests are started.

        Also seems to require a child watcher attached to the loop when run
        from pytest.
        """
        self.hass = get_test_home_assistant()
        asyncio.get_child_watcher().attach_loop(self.hass.loop)

    def tearDown(self):  # pylint: disable=invalid-name
        """Stop everything that was started."""
        self.hass.stop()

    def test_executing_service(self):
        """Test if able to call a configured service."""
        with tempfile.TemporaryDirectory() as tempdirname:
            path = os.path.join(tempdirname, 'called.txt')
            assert setup_component(
                    self.hass,
                    shell_command.DOMAIN, {
                        shell_command.DOMAIN: {
                            'test_service': "date > {}".format(path)
                        }
                    }
                )

            self.hass.services.call('shell_command', 'test_service',
                                    blocking=True)
            self.hass.block_till_done()
            assert os.path.isfile(path)

    def test_config_not_dict(self):
        """Test that setup fails if config is not a dict."""
        assert not setup_component(self.hass, shell_command.DOMAIN, {
                    shell_command.DOMAIN: ['some', 'weird', 'list']
                    })

    def test_config_not_valid_service_names(self):
        """Test that setup fails if config contains invalid service names."""
        assert not setup_component(self.hass, shell_command.DOMAIN, {
                    shell_command.DOMAIN: {
                        'this is invalid because space': 'touch bla.txt'
                        }
                    })

    @patch('homeassistant.components.shell_command.asyncio.subprocess'
           '.create_subprocess_shell')
    def test_template_render_no_template(self, mock_call):
        """Ensure shell_commands without templates get rendered properly."""
        mock_call.return_value = mock_process_creator(error=False)

        assert setup_component(
                    self.hass,
                    shell_command.DOMAIN, {
                        shell_command.DOMAIN: {
                            'test_service': "ls /bin"
                            }
                        })

        self.hass.services.call('shell_command', 'test_service',
                                blocking=True)

        self.hass.block_till_done()
        cmd = mock_call.mock_calls[0][1][0]

        assert 1 == mock_call.call_count
        assert 'ls /bin' == cmd

    @patch('homeassistant.components.shell_command.asyncio.subprocess'
           '.create_subprocess_exec')
    def test_template_render(self, mock_call):
        """Ensure shell_commands with templates get rendered properly."""
        self.hass.states.set('sensor.test_state', 'Works')
        mock_call.return_value = mock_process_creator(error=False)
        assert setup_component(self.hass, shell_command.DOMAIN, {
                    shell_command.DOMAIN: {
                        'test_service': ("ls /bin {{ states.sensor"
                                         ".test_state.state }}")
                        }
                    })

        self.hass.services.call('shell_command', 'test_service',
                                blocking=True)

        self.hass.block_till_done()
        cmd = mock_call.mock_calls[0][1]

        assert 1 == mock_call.call_count
        assert ('ls', '/bin', 'Works') == cmd

    @patch('homeassistant.components.shell_command.asyncio.subprocess'
           '.create_subprocess_shell')
    @patch('homeassistant.components.shell_command._LOGGER.error')
    def test_subprocess_error(self, mock_error, mock_call):
        """Test subprocess that returns an error."""
        mock_call.return_value = mock_process_creator(error=True)
        with tempfile.TemporaryDirectory() as tempdirname:
            path = os.path.join(tempdirname, 'called.txt')
            assert setup_component(self.hass, shell_command.DOMAIN, {
                        shell_command.DOMAIN: {
                            'test_service': "touch {}".format(path)
                            }
                        })

            self.hass.services.call('shell_command', 'test_service',
                                    blocking=True)

            self.hass.block_till_done()
            assert 1 == mock_call.call_count
            assert 1 == mock_error.call_count
            assert not os.path.isfile(path)

    @patch('homeassistant.components.shell_command._LOGGER.debug')
    def test_stdout_captured(self, mock_output):
        """Test subprocess that has stdout."""
        test_phrase = "I have output"
        assert setup_component(self.hass, shell_command.DOMAIN, {
                    shell_command.DOMAIN: {
                        'test_service': "echo {}".format(test_phrase)
                        }
                    })

        self.hass.services.call('shell_command', 'test_service',
                                blocking=True)

        self.hass.block_till_done()
        assert 1 == mock_output.call_count
        assert test_phrase.encode() + b'\n' == \
            mock_output.call_args_list[0][0][-1]

    @patch('homeassistant.components.shell_command._LOGGER.debug')
    def test_stderr_captured(self, mock_output):
        """Test subprocess that has stderr."""
        test_phrase = "I have error"
        assert setup_component(self.hass, shell_command.DOMAIN, {
                    shell_command.DOMAIN: {
                        'test_service': ">&2 echo {}".format(test_phrase)
                        }
                    })

        self.hass.services.call('shell_command', 'test_service',
                                blocking=True)

        self.hass.block_till_done()
        assert 1 == mock_output.call_count
        assert test_phrase.encode() + b'\n' == \
            mock_output.call_args_list[0][0][-1]