# -*- coding: UTF-8 -*-
from __future__ import unicode_literals

import functools
import io
import os
import os.path
import subprocess
import sys

import mock
import pytest

import pre_commit.constants as C
from pre_commit.commands.install_uninstall import install
from pre_commit.commands.run import _get_skips
from pre_commit.commands.run import _has_unmerged_paths
from pre_commit.commands.run import get_changed_files
from pre_commit.commands.run import run
from pre_commit.ordereddict import OrderedDict
from pre_commit.output import sys_stdout_write_wrapper
from pre_commit.runner import Runner
from pre_commit.util import cmd_output
from pre_commit.util import cwd
from testing.auto_namedtuple import auto_namedtuple
from testing.fixtures import add_config_to_repo
from testing.fixtures import make_consuming_repo
from testing.fixtures import modify_config
from testing.util import cmd_output_mocked_pre_commit_home


@pytest.yield_fixture
def repo_with_passing_hook(tempdir_factory):
    git_path = make_consuming_repo(tempdir_factory, 'script_hooks_repo')
    with cwd(git_path):
        yield git_path


@pytest.yield_fixture
def repo_with_failing_hook(tempdir_factory):
    git_path = make_consuming_repo(tempdir_factory, 'failing_hook_repo')
    with cwd(git_path):
        yield git_path


def stage_a_file(filename='foo.py'):
    cmd_output('touch', filename)
    cmd_output('git', 'add', filename)


def get_write_mock_output(write_mock):
    return b''.join(call[0][0] for call in write_mock.write.call_args_list)


def _get_opts(
        all_files=False,
        files=(),
        color=False,
        verbose=False,
        hook=None,
        no_stash=False,
        origin='',
        source='',
        allow_unstaged_config=False,
        hook_stage='commit'
):
    # These are mutually exclusive
    assert not (all_files and files)
    return auto_namedtuple(
        all_files=all_files,
        files=files,
        color=color,
        verbose=verbose,
        hook=hook,
        hook_stage=hook_stage,
        no_stash=no_stash,
        origin=origin,
        source=source,
        allow_unstaged_config=allow_unstaged_config,
    )


def _do_run(repo, args, environ={}):
    runner = Runner(repo)
    write_mock = mock.Mock()
    write_fn = functools.partial(sys_stdout_write_wrapper, stream=write_mock)
    with cwd(runner.git_root):  # replicates Runner.create behaviour
        ret = run(runner, args, write=write_fn, environ=environ)
    printed = get_write_mock_output(write_mock)
    return ret, printed


def _test_run(repo, options, expected_outputs, expected_ret, stage):
    if stage:
        stage_a_file()
    args = _get_opts(**options)
    ret, printed = _do_run(repo, args)

    assert ret == expected_ret, (ret, expected_ret, printed)
    for expected_output_part in expected_outputs:
        assert expected_output_part in printed


def test_run_all_hooks_failing(
        repo_with_failing_hook, mock_out_store_directory
):
    _test_run(
        repo_with_failing_hook,
        {},
        (
            b'Failing hook',
            b'Failed',
            b'hookid: failing_hook',
            b'Fail\nfoo.py\n',
        ),
        1,
        True,
    )


def test_arbitrary_bytes_hook(tempdir_factory, mock_out_store_directory):
    git_path = make_consuming_repo(tempdir_factory, 'arbitrary_bytes_repo')
    with cwd(git_path):
        _test_run(git_path, {}, (b'\xe2\x98\x83\xb2\n',), 1, True)


def test_hook_that_modifies_but_returns_zero(
        tempdir_factory, mock_out_store_directory,
):
    git_path = make_consuming_repo(
        tempdir_factory, 'modified_file_returns_zero_repo',
    )
    with cwd(git_path):
        stage_a_file('bar.py')
        _test_run(
            git_path,
            {},
            (
                # The first should fail
                b'Failed',
                # With a modified file (default message + the hook's output)
                b'Files were modified by this hook. Additional output:\n\n'
                b'Modified: foo.py',
                # The next hook should pass despite the first modifying
                b'Passed',
                # The next hook should fail
                b'Failed',
                # bar.py was modified, but provides no additional output
                b'Files were modified by this hook.\n',
            ),
            1,
            True,
        )


@pytest.mark.parametrize(
    ('options', 'outputs', 'expected_ret', 'stage'),
    (
        ({}, (b'Bash hook', b'Passed'), 0, True),
        ({'verbose': True}, (b'foo.py\nHello World',), 0, True),
        ({'hook': 'bash_hook'}, (b'Bash hook', b'Passed'), 0, True),
        ({'hook': 'nope'}, (b'No hook with id `nope`',), 1, True),
        (
            {'all_files': True, 'verbose': True},
            (b'foo.py',),
            0,
            True,
        ),
        (
            {'files': ('foo.py',), 'verbose': True},
            (b'foo.py',),
            0,
            True,
        ),
        ({}, (b'Bash hook', b'(no files to check)', b'Skipped'), 0, False),
    )
)
def test_run(
        repo_with_passing_hook,
        options,
        outputs,
        expected_ret,
        stage,
        mock_out_store_directory,
):
    _test_run(repo_with_passing_hook, options, outputs, expected_ret, stage)


def test_always_run(repo_with_passing_hook, mock_out_store_directory):
    with modify_config() as config:
        config[0]['hooks'][0]['always_run'] = True
    _test_run(repo_with_passing_hook, {}, (b'Bash hook', b'Passed'), 0, False)


@pytest.mark.parametrize(
    ('origin', 'source', 'expect_failure'),
    (
        ('master', 'master', False),
        ('master', '', True),
        ('', 'master', True),
    )
)
def test_origin_source_error_msg(
        repo_with_passing_hook, origin, source, expect_failure,
        mock_out_store_directory,
):
    args = _get_opts(origin=origin, source=source)
    ret, printed = _do_run(repo_with_passing_hook, args)
    warning_msg = b'Specify both --origin and --source.'
    if expect_failure:
        assert ret == 1
        assert warning_msg in printed
    else:
        assert ret == 0
        assert warning_msg not in printed


@pytest.mark.parametrize(
    ('no_stash', 'all_files', 'expect_stash'),
    (
        (True, True, False),
        (True, False, False),
        (False, True, False),
        (False, False, True),
    ),
)
def test_no_stash(
        repo_with_passing_hook,
        no_stash,
        all_files,
        expect_stash,
        mock_out_store_directory,
):
    stage_a_file()
    # Make unstaged changes
    with open('foo.py', 'w') as foo_file:
        foo_file.write('import os\n')

    args = _get_opts(no_stash=no_stash, all_files=all_files)
    ret, printed = _do_run(repo_with_passing_hook, args)
    assert ret == 0
    warning_msg = b'[WARNING] Unstaged files detected.'
    if expect_stash:
        assert warning_msg in printed
    else:
        assert warning_msg not in printed


@pytest.mark.parametrize(('output', 'expected'), (('some', True), ('', False)))
def test_has_unmerged_paths(output, expected):
    mock_runner = mock.Mock()
    mock_runner.cmd_runner.run.return_value = (1, output, '')
    assert _has_unmerged_paths(mock_runner) is expected


def test_merge_conflict(in_merge_conflict, mock_out_store_directory):
    ret, printed = _do_run(in_merge_conflict, _get_opts())
    assert ret == 1
    assert b'Unmerged files.  Resolve before committing.' in printed


def test_merge_conflict_modified(in_merge_conflict, mock_out_store_directory):
    # Touch another file so we have unstaged non-conflicting things
    assert os.path.exists('dummy')
    with open('dummy', 'w') as dummy_file:
        dummy_file.write('bar\nbaz\n')

    ret, printed = _do_run(in_merge_conflict, _get_opts())
    assert ret == 1
    assert b'Unmerged files.  Resolve before committing.' in printed


def test_merge_conflict_resolved(in_merge_conflict, mock_out_store_directory):
    cmd_output('git', 'add', '.')
    ret, printed = _do_run(in_merge_conflict, _get_opts())
    for msg in (
            b'Checking merge-conflict files only.', b'Bash hook', b'Passed',
    ):
        assert msg in printed


@pytest.mark.parametrize(
    ('environ', 'expected_output'),
    (
        ({}, set([])),
        ({'SKIP': ''}, set([])),
        ({'SKIP': ','}, set([])),
        ({'SKIP': ',foo'}, set(['foo'])),
        ({'SKIP': 'foo'}, set(['foo'])),
        ({'SKIP': 'foo,bar'}, set(['foo', 'bar'])),
        ({'SKIP': ' foo , bar'}, set(['foo', 'bar'])),
    ),
)
def test_get_skips(environ, expected_output):
    ret = _get_skips(environ)
    assert ret == expected_output


def test_skip_hook(repo_with_passing_hook, mock_out_store_directory):
    ret, printed = _do_run(
        repo_with_passing_hook, _get_opts(), {'SKIP': 'bash_hook'},
    )
    for msg in (b'Bash hook', b'Skipped'):
        assert msg in printed


def test_hook_id_not_in_non_verbose_output(
        repo_with_passing_hook, mock_out_store_directory
):
    ret, printed = _do_run(repo_with_passing_hook, _get_opts(verbose=False))
    assert b'[bash_hook]' not in printed


def test_hook_id_in_verbose_output(
        repo_with_passing_hook, mock_out_store_directory,
):
    ret, printed = _do_run(repo_with_passing_hook, _get_opts(verbose=True))
    assert b'[bash_hook] Bash hook' in printed


def test_multiple_hooks_same_id(
        repo_with_passing_hook, mock_out_store_directory,
):
    with cwd(repo_with_passing_hook):
        # Add bash hook on there again
        with modify_config() as config:
            config[0]['hooks'].append({'id': 'bash_hook'})
        stage_a_file()

    ret, output = _do_run(repo_with_passing_hook, _get_opts())
    assert ret == 0
    assert output.count(b'Bash hook') == 2


def test_non_ascii_hook_id(
        repo_with_passing_hook, mock_out_store_directory, tempdir_factory,
):
    with cwd(repo_with_passing_hook):
        install(Runner(repo_with_passing_hook))
        _, stdout, _ = cmd_output_mocked_pre_commit_home(
            sys.executable, '-m', 'pre_commit.main', 'run', '☃',
            retcode=None, tempdir_factory=tempdir_factory,
        )
        assert 'UnicodeDecodeError' not in stdout
        # Doesn't actually happen, but a reasonable assertion
        assert 'UnicodeEncodeError' not in stdout


def test_stdout_write_bug_py26(
        repo_with_failing_hook, mock_out_store_directory, tempdir_factory,
):
    with cwd(repo_with_failing_hook):
        with modify_config() as config:
            config[0]['hooks'][0]['args'] = ['☃']
        stage_a_file()

        install(Runner(repo_with_failing_hook))

        # Have to use subprocess because pytest monkeypatches sys.stdout
        _, stdout, _ = cmd_output_mocked_pre_commit_home(
            'git', 'commit', '-m', 'Commit!',
            # git commit puts pre-commit to stderr
            stderr=subprocess.STDOUT,
            retcode=None,
            tempdir_factory=tempdir_factory,
        )
        assert 'UnicodeEncodeError' not in stdout
        # Doesn't actually happen, but a reasonable assertion
        assert 'UnicodeDecodeError' not in stdout


def test_hook_install_failure(mock_out_store_directory, tempdir_factory):
    git_path = make_consuming_repo(tempdir_factory, 'not_installable_repo')
    with cwd(git_path):
        install(Runner(git_path))

        _, stdout, _ = cmd_output_mocked_pre_commit_home(
            'git', 'commit', '-m', 'Commit!',
            # git commit puts pre-commit to stderr
            stderr=subprocess.STDOUT,
            retcode=None,
            encoding=None,
            tempdir_factory=tempdir_factory,
        )
        assert b'UnicodeDecodeError' not in stdout
        # Doesn't actually happen, but a reasonable assertion
        assert b'UnicodeEncodeError' not in stdout

        # Sanity check our output
        assert (
            b'An unexpected error has occurred: CalledProcessError: ' in
            stdout
        )
        assert '☃'.encode('UTF-8') + '²'.encode('latin1') in stdout


def test_get_changed_files():
    files = get_changed_files(
        '78c682a1d13ba20e7cb735313b9314a74365cd3a',
        '3387edbb1288a580b37fe25225aa0b856b18ad1a',
    )
    assert files == ['CHANGELOG.md', 'setup.py']


def test_lots_of_files(mock_out_store_directory, tempdir_factory):
    # windows xargs seems to have a bug, here's a regression test for
    # our workaround
    git_path = make_consuming_repo(tempdir_factory, 'python_hooks_repo')
    with cwd(git_path):
        # Override files so we run against them
        with modify_config() as config:
            config[0]['hooks'][0]['files'] = ''

        # Write a crap ton of files
        for i in range(400):
            filename = '{0}{1}'.format('a' * 100, i)
            open(filename, 'w').close()

        cmd_output('bash', '-c', 'git add .')
        install(Runner(git_path))

        cmd_output_mocked_pre_commit_home(
            'git', 'commit', '-m', 'Commit!',
            # git commit puts pre-commit to stderr
            stderr=subprocess.STDOUT,
            tempdir_factory=tempdir_factory,
        )


@pytest.mark.parametrize(
    ('hook_stage', 'stage_for_first_hook', 'stage_for_second_hook',
     'expected_output'),
    (
        ('push', ['commit'], ['commit'], [b'', b'']),
        ('push', ['commit', 'push'], ['commit', 'push'],
         [b'hook 1', b'hook 2']),
        ('push', [], [], [b'hook 1', b'hook 2']),
        ('push', [], ['commit'], [b'hook 1', b'']),
        ('push', ['push'], ['commit'], [b'hook 1', b'']),
        ('push', ['commit'], ['push'], [b'', b'hook 2']),
        ('commit', ['commit', 'push'], ['commit', 'push'],
         [b'hook 1', b'hook 2']),
        ('commit', ['commit'], ['commit'], [b'hook 1', b'hook 2']),
        ('commit', [], [], [b'hook 1', b'hook 2']),
        ('commit', [], ['commit'], [b'hook 1', b'hook 2']),
        ('commit', ['push'], ['commit'], [b'', b'hook 2']),
        ('commit', ['commit'], ['push'], [b'hook 1', b'']),
    )
)
def test_local_hook_for_stages(
        repo_with_passing_hook, mock_out_store_directory,
        stage_for_first_hook,
        stage_for_second_hook,
        hook_stage,
        expected_output
):
    config = OrderedDict((
        ('repo', 'local'),
        ('hooks', (OrderedDict((
            ('id', 'flake8'),
            ('name', 'hook 1'),
            ('entry', 'python -m flake8.__main__'),
            ('language', 'system'),
            ('files', r'\.py$'),
            ('stages', stage_for_first_hook)
        )), OrderedDict((
            ('id', 'do_not_commit'),
            ('name', 'hook 2'),
            ('entry', 'DO NOT COMMIT'),
            ('language', 'pcre'),
            ('files', '^(.*)$'),
            ('stages', stage_for_second_hook)
        ))))
    ))
    add_config_to_repo(repo_with_passing_hook, config)

    with io.open('dummy.py', 'w') as staged_file:
        staged_file.write('"""TODO: something"""\n')
    cmd_output('git', 'add', 'dummy.py')

    _test_run(
        repo_with_passing_hook,
        {'hook_stage': hook_stage},
        expected_outputs=expected_output,
        expected_ret=0,
        stage=False
    )


def test_local_hook_passes(repo_with_passing_hook, mock_out_store_directory):
    config = OrderedDict((
        ('repo', 'local'),
        ('hooks', (OrderedDict((
            ('id', 'flake8'),
            ('name', 'flake8'),
            ('entry', 'python -m flake8.__main__'),
            ('language', 'system'),
            ('files', r'\.py$'),
        )), OrderedDict((
            ('id', 'do_not_commit'),
            ('name', 'Block if "DO NOT COMMIT" is found'),
            ('entry', 'DO NOT COMMIT'),
            ('language', 'pcre'),
            ('files', '^(.*)$'),
        ))))
    ))
    add_config_to_repo(repo_with_passing_hook, config)

    with io.open('dummy.py', 'w') as staged_file:
        staged_file.write('"""TODO: something"""\n')
    cmd_output('git', 'add', 'dummy.py')

    _test_run(
        repo_with_passing_hook,
        options={},
        expected_outputs=[b''],
        expected_ret=0,
        stage=False
    )


def test_local_hook_fails(repo_with_passing_hook, mock_out_store_directory):
    config = OrderedDict((
        ('repo', 'local'),
        ('hooks', [OrderedDict((
            ('id', 'no-todo'),
            ('name', 'No TODO'),
            ('entry', 'sh -c "! grep -iI todo $@" --'),
            ('language', 'system'),
            ('files', ''),
        ))])
    ))
    add_config_to_repo(repo_with_passing_hook, config)

    with io.open('dummy.py', 'w') as staged_file:
        staged_file.write('"""TODO: something"""\n')
    cmd_output('git', 'add', 'dummy.py')

    _test_run(
        repo_with_passing_hook,
        options={},
        expected_outputs=[b''],
        expected_ret=1,
        stage=False,
    )


@pytest.yield_fixture
def modified_config_repo(repo_with_passing_hook):
    with modify_config(repo_with_passing_hook, commit=False) as config:
        # Some minor modification
        config[0]['hooks'][0]['files'] = ''
    yield repo_with_passing_hook


def test_allow_unstaged_config_option(
        modified_config_repo, mock_out_store_directory,
):
    args = _get_opts(allow_unstaged_config=True)
    ret, printed = _do_run(modified_config_repo, args)
    expected = (
        b'You have an unstaged config file and have specified the '
        b'--allow-unstaged-config option.'
    )
    assert expected in printed
    assert ret == 0


def test_no_allow_unstaged_config_option(
        modified_config_repo, mock_out_store_directory,
):
    args = _get_opts(allow_unstaged_config=False)
    ret, printed = _do_run(modified_config_repo, args)
    assert b'Your .pre-commit-config.yaml is unstaged.' in printed
    assert ret == 1


@pytest.mark.parametrize(
    'opts',
    (
        {'allow_unstaged_config': False, 'no_stash': True},
        {'all_files': True},
        {'files': [C.CONFIG_FILE]},
    ),
)
def test_unstaged_message_suppressed(
        modified_config_repo, mock_out_store_directory, opts,
):
    args = _get_opts(**opts)
    ret, printed = _do_run(modified_config_repo, args)
    assert b'Your .pre-commit-config.yaml is unstaged.' not in printed


def test_files_running_subdir(
        repo_with_passing_hook, mock_out_store_directory, tempdir_factory,
):
    with cwd(repo_with_passing_hook):
        install(Runner(repo_with_passing_hook))

        os.mkdir('subdir')
        open('subdir/foo.py', 'w').close()
        cmd_output('git', 'add', 'subdir/foo.py')

        with cwd('subdir'):
            # Use subprocess to demonstrate behaviour in main
            _, stdout, _ = cmd_output_mocked_pre_commit_home(
                sys.executable, '-m', 'pre_commit.main', 'run', '-v',
                # Files relative to where we are (#339)
                '--files', 'foo.py',
                tempdir_factory=tempdir_factory,
            )
        assert 'subdir/foo.py'.replace('/', os.sep) in stdout