import pytest
import json
from six import StringIO
from mock import MagicMock
from thefuck.shells.generic import ShellConfiguration
from thefuck.entrypoints.not_configured import main


@pytest.fixture(autouse=True)
def usage_tracker(mocker):
    return mocker.patch(
        'thefuck.entrypoints.not_configured._get_not_configured_usage_tracker_path',
        new_callable=MagicMock)


@pytest.fixture(autouse=True)
def usage_tracker_io(usage_tracker):
    io = StringIO()
    usage_tracker.return_value \
                 .open.return_value \
                 .__enter__.return_value = io
    return io


@pytest.fixture(autouse=True)
def usage_tracker_exists(usage_tracker):
    usage_tracker.return_value \
                 .exists.return_value = True
    return usage_tracker.return_value.exists


def _assert_tracker_updated(usage_tracker_io, pid):
    usage_tracker_io.seek(0)
    info = json.load(usage_tracker_io)
    assert info['pid'] == pid


def _change_tracker(usage_tracker_io, pid):
    usage_tracker_io.truncate(0)
    info = {'pid': pid, 'time': 0}
    json.dump(info, usage_tracker_io)
    usage_tracker_io.seek(0)


@pytest.fixture(autouse=True)
def shell_pid(mocker):
    return mocker.patch('thefuck.entrypoints.not_configured._get_shell_pid',
                        new_callable=MagicMock)


@pytest.fixture(autouse=True)
def shell(mocker):
    shell = mocker.patch('thefuck.entrypoints.not_configured.shell',
                         new_callable=MagicMock)
    shell.get_history.return_value = []
    shell.how_to_configure.return_value = ShellConfiguration(
        content='eval $(thefuck --alias)',
        path='/tmp/.bashrc',
        reload='bash',
        can_configure_automatically=True)
    return shell


@pytest.fixture(autouse=True)
def shell_config(mocker):
    path_mock = mocker.patch('thefuck.entrypoints.not_configured.Path',
                             new_callable=MagicMock)
    return path_mock.return_value \
        .expanduser.return_value \
        .open.return_value \
        .__enter__.return_value


@pytest.fixture(autouse=True)
def logs(mocker):
    return mocker.patch('thefuck.entrypoints.not_configured.logs',
                        new_callable=MagicMock)


def test_for_generic_shell(shell, logs):
    shell.how_to_configure.return_value = None
    main()
    logs.how_to_configure_alias.assert_called_once()


def test_on_first_run(usage_tracker_io, usage_tracker_exists, shell_pid, logs):
    shell_pid.return_value = 12
    main()
    usage_tracker_exists.return_value = False
    _assert_tracker_updated(usage_tracker_io, 12)
    logs.how_to_configure_alias.assert_called_once()


def test_on_run_after_other_commands(usage_tracker_io, shell_pid, shell, logs):
    shell_pid.return_value = 12
    shell.get_history.return_value = ['fuck', 'ls']
    _change_tracker(usage_tracker_io, 12)
    main()
    logs.how_to_configure_alias.assert_called_once()


def test_on_first_run_from_current_shell(usage_tracker_io, shell_pid,
                                         shell, logs):
    shell.get_history.return_value = ['fuck']
    shell_pid.return_value = 12
    main()
    _assert_tracker_updated(usage_tracker_io, 12)
    logs.how_to_configure_alias.assert_called_once()


def test_when_cant_configure_automatically(shell_pid, shell, logs):
    shell_pid.return_value = 12
    shell.how_to_configure.return_value = ShellConfiguration(
        content='eval $(thefuck --alias)',
        path='/tmp/.bashrc',
        reload='bash',
        can_configure_automatically=False)
    main()
    logs.how_to_configure_alias.assert_called_once()


def test_when_already_configured(usage_tracker_io, shell_pid,
                                 shell, shell_config, logs):
    shell.get_history.return_value = ['fuck']
    shell_pid.return_value = 12
    _change_tracker(usage_tracker_io, 12)
    shell_config.read.return_value = 'eval $(thefuck --alias)'
    main()
    logs.already_configured.assert_called_once()


def test_when_successfully_configured(usage_tracker_io, shell_pid,
                                      shell, shell_config, logs):
    shell.get_history.return_value = ['fuck']
    shell_pid.return_value = 12
    _change_tracker(usage_tracker_io, 12)
    shell_config.read.return_value = ''
    main()
    shell_config.write.assert_any_call('eval $(thefuck --alias)')
    logs.configured_successfully.assert_called_once()