"""Tests for the Application class."""
import argparse
import sys
from unittest import mock

import pytest

from flake8.main import application as app


def options(**kwargs):
    """Generate argparse.Namespace for our Application."""
    kwargs.setdefault("verbose", 0)
    kwargs.setdefault("output_file", None)
    kwargs.setdefault("count", False)
    kwargs.setdefault("exit_zero", False)
    return argparse.Namespace(**kwargs)


@pytest.fixture
def application():
    """Create an application."""
    return app.Application()


@pytest.mark.parametrize(
    "result_count, catastrophic, exit_zero, value",
    [
        (0, False, False, False),
        (0, True, False, True),
        (2, False, False, True),
        (2, True, False, True),
        (0, True, True, True),
        (2, False, True, False),
        (2, True, True, True),
    ],
)
def test_exit_does_raise(
    result_count, catastrophic, exit_zero, value, application
):
    """Verify Application.exit doesn't raise SystemExit."""
    application.result_count = result_count
    application.catastrophic_failure = catastrophic
    application.options = options(exit_zero=exit_zero)

    with pytest.raises(SystemExit) as excinfo:
        application.exit()

    assert excinfo.value.args[0] is value


def test_warns_on_unknown_formatter_plugin_name(application):
    """Verify we log a warning with an unfound plugin."""
    default = mock.Mock()
    execute = default.execute
    application.formatting_plugins = {
        "default": default,
    }
    with mock.patch.object(app.LOG, "warning") as warning:
        assert execute is application.formatter_for("fake-plugin-name")

    assert warning.called is True
    assert warning.call_count == 1


def test_returns_specified_plugin(application):
    """Verify we get the plugin we want."""
    desired = mock.Mock()
    execute = desired.execute
    application.formatting_plugins = {
        "default": mock.Mock(),
        "desired": desired,
    }

    with mock.patch.object(app.LOG, "warning") as warning:
        assert execute is application.formatter_for("desired")

    assert warning.called is False


def test_prelim_opts_args(application):
    """Verify we get sensible prelim opts and args."""
    opts, args = application.parse_preliminary_options(
        ["--foo", "--verbose", "src", "setup.py", "--statistics", "--version"]
    )

    assert opts.verbose
    assert args == ["--foo", "src", "setup.py", "--statistics", "--version"]


def test_prelim_opts_ignore_help(application):
    """Verify -h/--help is not handled."""
    # GIVEN

    # WHEN
    _, args = application.parse_preliminary_options(["--help", "-h"])

    # THEN
    assert args == ["--help", "-h"]


def test_prelim_opts_handles_empty(application):
    """Verify empty argv lists are handled correctly."""
    irrelevant_args = ["myexe", "/path/to/foo"]
    with mock.patch.object(sys, "argv", irrelevant_args):
        opts, args = application.parse_preliminary_options([])

        assert args == []