"""Integration tests for the main entrypoint of flake8."""
import json
import os
import platform
import sys
from unittest import mock

import pytest

from flake8 import utils
from flake8.main import cli


def _call_main(argv, retv=0):
    with pytest.raises(SystemExit) as excinfo:
        cli.main(argv)
    assert excinfo.value.code == retv


def test_diff_option(tmpdir, capsys):
    """Ensure that `flake8 --diff` works."""
    t_py_contents = '''\
import os
import sys  # unused but not part of diff

print('(to avoid trailing whitespace in test)')
print('(to avoid trailing whitespace in test)')
print(os.path.join('foo', 'bar'))

y  # part of the diff and an error
'''

    diff = '''\
diff --git a/t.py b/t.py
index d64ac39..7d943de 100644
--- a/t.py
+++ b/t.py
@@ -4,3 +4,5 @@ import sys  # unused but not part of diff
 print('(to avoid trailing whitespace in test)')
 print('(to avoid trailing whitespace in test)')
 print(os.path.join('foo', 'bar'))
+
+y  # part of the diff and an error
'''

    with mock.patch.object(utils, 'stdin_get_value', return_value=diff):
        with tmpdir.as_cwd():
            tmpdir.join('t.py').write(t_py_contents)
            _call_main(['--diff'], retv=1)

    out, err = capsys.readouterr()
    assert out == "t.py:8:1: F821 undefined name 'y'\n"
    assert err == ''


def test_form_feed_line_split(tmpdir, capsys):
    """Test that form feed is treated the same for stdin."""
    src = 'x=1\n\f\ny=1\n'
    expected_out = '''\
t.py:1:2: E225 missing whitespace around operator
t.py:3:2: E225 missing whitespace around operator
'''

    with tmpdir.as_cwd():
        tmpdir.join('t.py').write(src)

        with mock.patch.object(utils, 'stdin_get_value', return_value=src):
            _call_main(['-', '--stdin-display-name=t.py'], retv=1)
            out, err = capsys.readouterr()
            assert out == expected_out
            assert err == ''

        _call_main(['t.py'], retv=1)
        out, err = capsys.readouterr()
        assert out == expected_out
        assert err == ''


def test_e101_indent_char_does_not_reset(tmpdir, capsys):
    """Ensure that E101 with an existing indent_char does not reset it."""
    t_py_contents = """\
if True:
    print('space indented')

s = '''\
\ttab indented
'''  # noqa: E101

if True:
    print('space indented')
"""

    with tmpdir.as_cwd():
        tmpdir.join('t.py').write(t_py_contents)
        _call_main(['t.py'])


def test_statistics_option(tmpdir, capsys):
    """Ensure that `flake8 --statistics` works."""
    with tmpdir.as_cwd():
        tmpdir.join('t.py').write('import os\nimport sys\n')
        _call_main(['--statistics', 't.py'], retv=1)

    out, err = capsys.readouterr()
    assert out == '''\
t.py:1:1: F401 'os' imported but unused
t.py:2:1: F401 'sys' imported but unused
2     F401 'os' imported but unused
'''
    assert err == ''


def test_show_source_option(tmpdir, capsys):
    """Ensure that --show-source and --no-show-source work."""
    with tmpdir.as_cwd():
        tmpdir.join('tox.ini').write('[flake8]\nshow_source = true\n')
        tmpdir.join('t.py').write('import os\n')
        _call_main(['t.py'], retv=1)

    out, err = capsys.readouterr()
    assert out == '''\
t.py:1:1: F401 'os' imported but unused
import os
^
'''
    assert err == ''

    with tmpdir.as_cwd():
        _call_main(['t.py', '--no-show-source'], retv=1)

    out, err = capsys.readouterr()
    assert out == '''\
t.py:1:1: F401 'os' imported but unused
'''
    assert err == ''


def test_extend_exclude(tmpdir, capsys):
    """Ensure that `flake8 --extend-exclude` works."""
    for d in ['project', 'vendor', 'legacy', '.git', '.tox', '.hg']:
        tmpdir.mkdir(d).join('t.py').write('import os\nimport sys\n')

    with tmpdir.as_cwd():
        _call_main(['--extend-exclude=vendor,legacy/'], retv=1)

    out, err = capsys.readouterr()
    expected_out = '''\
./project/t.py:1:1: F401 'os' imported but unused
./project/t.py:2:1: F401 'sys' imported but unused
'''
    assert out == expected_out.replace('/', os.sep)
    assert err == ''


def test_malformed_per_file_ignores_error(tmpdir, capsys):
    """Test the error message for malformed `per-file-ignores`."""
    setup_cfg = '''\
[flake8]
per-file-ignores =
    incorrect/*
    values/*
'''

    with tmpdir.as_cwd():
        tmpdir.join('setup.cfg').write(setup_cfg)
        _call_main(['.'], retv=1)

    out, err = capsys.readouterr()
    assert out == '''\
There was a critical error during execution of Flake8:
Expected `per-file-ignores` to be a mapping from file exclude patterns to ignore codes.

Configured `per-file-ignores` setting:

    incorrect/*
    values/*
'''  # noqa: E501


def test_tokenization_error_but_not_syntax_error(tmpdir, capsys):
    """Test that flake8 does not crash on tokenization errors."""
    with tmpdir.as_cwd():
        # this is a crash in the tokenizer, but not in the ast
        tmpdir.join('t.py').write("b'foo' \\\n")
        _call_main(['t.py'], retv=1)

    out, err = capsys.readouterr()

    expected = '''\
t.py:1:1: E902 TokenError: EOF in multi-line statement
'''

    expected += '''\
t.py:1:8: E999 SyntaxError: unexpected EOF while parsing
''' if (platform.python_implementation() == "CPython"
        and sys.version_info >= (3, 8)) else ""

    assert out == expected
    assert err == ''


def test_tokenization_error_is_a_syntax_error(tmpdir, capsys):
    """Test when tokenize raises a SyntaxError."""
    with tmpdir.as_cwd():
        tmpdir.join('t.py').write('if True:\n    pass\n pass\n')
        _call_main(['t.py'], retv=1)

    out, err = capsys.readouterr()
    assert out == '''\
t.py:1:1: E902 IndentationError: unindent does not match any outer indentation level
t.py:3:5: E999 IndentationError: unindent does not match any outer indentation level
'''  # noqa: E501
    assert err == ''


def test_bug_report_successful(capsys):
    """Test that --bug-report does not crash."""
    _call_main(['--bug-report'])
    out, err = capsys.readouterr()
    assert json.loads(out)
    assert err == ''


def test_specific_noqa_does_not_clobber_pycodestyle_noqa(tmpdir, capsys):
    """See https://github.com/pycqa/flake8/issues/1104."""
    with tmpdir.as_cwd():
        tmpdir.join('t.py').write("test = ('ABC' == None)  # noqa: E501\n")
        _call_main(['t.py'], retv=1)

    out, err = capsys.readouterr()
    assert out == '''\
t.py:1:15: E711 comparison to None should be 'if cond is None:'
'''


def test_specific_noqa_on_line_with_continuation(tmpdir, capsys):
    """See https://github.com/pycqa/flake8/issues/621."""
    t_py_src = '''\
from os \\
    import path  # noqa: F401

x = """
    trailing whitespace: \n
"""  # noqa: W291
'''

    with tmpdir.as_cwd():
        tmpdir.join('t.py').write(t_py_src)
        _call_main(['t.py'], retv=0)

    out, err = capsys.readouterr()
    assert out == err == ''


def test_physical_line_file_not_ending_in_newline(tmpdir, capsys):
    """See https://github.com/PyCQA/pycodestyle/issues/960."""
    t_py_src = 'def f():\n\tpass'

    with tmpdir.as_cwd():
        tmpdir.join('t.py').write(t_py_src)
        _call_main(['t.py'], retv=1)

    out, err = capsys.readouterr()
    assert out == '''\
t.py:2:1: W191 indentation contains tabs
t.py:2:6: W292 no newline at end of file
'''


def test_physical_line_file_not_ending_in_newline_trailing_ws(tmpdir, capsys):
    """See https://github.com/PyCQA/pycodestyle/issues/960."""
    t_py_src = 'x = 1   '

    with tmpdir.as_cwd():
        tmpdir.join('t.py').write(t_py_src)
        _call_main(['t.py'], retv=1)

    out, err = capsys.readouterr()
    assert out == '''\
t.py:1:6: W291 trailing whitespace
t.py:1:9: W292 no newline at end of file
'''


def test_obtaining_args_from_sys_argv_when_not_explicity_provided(capsys):
    """Test that arguments are obtained from 'sys.argv'."""
    with mock.patch('sys.argv', ['flake8', '--help']):
        _call_main(None)

    out, err = capsys.readouterr()
    assert out.startswith('usage: flake8 [options] file file ...\n')
    assert err == ''


def test_cli_config_option_respected(tmp_path):
    """Test --config is used."""
    config = tmp_path / "flake8.ini"
    config.write_text("""\
[flake8]
ignore = F401
""")

    py_file = tmp_path / "t.py"
    py_file.write_text("import os\n")

    _call_main(["--config", str(config), str(py_file)])


def test_cli_isolated_overrides_config_option(tmp_path):
    """Test --isolated overrides --config."""
    config = tmp_path / "flake8.ini"
    config.write_text("""\
[flake8]
ignore = F401
""")

    py_file = tmp_path / "t.py"
    py_file.write_text("import os\n")

    _call_main(["--isolated", "--config", str(config), str(py_file)], retv=1)


def test_file_not_found(tmpdir, capsys):
    """Ensure that a not-found file / directory is an error."""
    with tmpdir.as_cwd():
        _call_main(["i-do-not-exist"], retv=1)
    out, err = capsys.readouterr()
    assert out.startswith("i-do-not-exist:0:1: E902")
    assert err == ""


def test_output_file(tmpdir, capsys):
    """Ensure that --output-file is honored."""
    tmpdir.join('t.py').write('import os\n')

    with tmpdir.as_cwd():
        _call_main(['t.py', '--output-file=f'], retv=1)

    out, err = capsys.readouterr()
    assert out == err == ""

    expected = "t.py:1:1: F401 'os' imported but unused\n"
    assert tmpdir.join('f').read() == expected