"""Unit tests for the FileChecker class."""
import mock
import pytest

import flake8
from flake8 import checker


@mock.patch('flake8.processor.FileProcessor')
def test_run_ast_checks_handles_SyntaxErrors(FileProcessor):  # noqa: N802,N803
    """Stress our SyntaxError handling.

    Related to: https://gitlab.com/pycqa/flake8/issues/237
    """
    processor = mock.Mock(lines=[])
    FileProcessor.return_value = processor
    processor.build_ast.side_effect = SyntaxError('Failed to build ast',
                                                  ('', 1, 5, 'foo(\n'))
    file_checker = checker.FileChecker(__file__, checks={}, options=object())

    with mock.patch.object(file_checker, 'report') as report:
        file_checker.run_ast_checks()

        report.assert_called_once_with(
            'E999', 1, 3,
            'SyntaxError: Failed to build ast',
        )


@mock.patch('flake8.checker.FileChecker._make_processor', return_value=None)
def test_repr(*args):
    """Verify we generate a correct repr."""
    file_checker = checker.FileChecker(
        'example.py', checks={}, options=object(),
    )
    assert repr(file_checker) == 'FileChecker for example.py'


def test_nonexistent_file():
    """Verify that checking non-existent file results in an error."""
    c = checker.FileChecker("foobar.py", checks={}, options=object())

    assert c.processor is None
    assert not c.should_process
    assert len(c.results) == 1
    error = c.results[0]
    assert error[0] == "E902"


def test_raises_exception_on_failed_plugin(tmp_path, default_options):
    """Checks that a failing plugin results in PluginExecutionFailed."""
    foobar = tmp_path / 'foobar.py'
    foobar.write_text(u"I exist!")  # Create temp file
    plugin = {
        "name": "failure",
        "plugin_name": "failure",  # Both are necessary
        "parameters": dict(),
        "plugin": mock.MagicMock(side_effect=ValueError),
    }
    """Verify a failing plugin results in an plugin error"""
    fchecker = checker.FileChecker(
        str(foobar), checks=[], options=default_options)
    with pytest.raises(flake8.exceptions.PluginExecutionFailed):
        fchecker.run_check(plugin)