# RhodeCode VCSServer provides access to different vcs backends via network.
# Copyright (C) 2014-2023 RhodeCode GmbH
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA

import io
import more_itertools

import dulwich.protocol
import mock
import pytest
import webob
import webtest

from vcsserver import hooks, pygrack

from vcsserver.str_utils import ascii_bytes


@pytest.fixture()
def pygrack_instance(tmpdir):
    """
    Creates a pygrack app instance.

    Right now, it does not much helpful regarding the passed directory.
    It just contains the required folders to pass the signature test.
    """
    for dir_name in ('config', 'head', 'info', 'objects', 'refs'):
        tmpdir.mkdir(dir_name)

    return pygrack.GitRepository('repo_name', str(tmpdir), 'git', False, {})


@pytest.fixture()
def pygrack_app(pygrack_instance):
    """
    Creates a pygrack app wrapped in webtest.TestApp.
    """
    return webtest.TestApp(pygrack_instance)


def test_invalid_service_info_refs_returns_403(pygrack_app):
    response = pygrack_app.get('/info/refs?service=git-upload-packs',
                               expect_errors=True)

    assert response.status_int == 403


def test_invalid_endpoint_returns_403(pygrack_app):
    response = pygrack_app.post('/git-upload-packs', expect_errors=True)

    assert response.status_int == 403


@pytest.mark.parametrize('sideband', [
    'side-band-64k',
    'side-band',
    'side-band no-progress',
])
def test_pre_pull_hook_fails_with_sideband(pygrack_app, sideband):
    request = ''.join([
        '0054want 74730d410fcb6603ace96f1dc55ea6196122532d ',
        f'multi_ack {sideband} ofs-delta\n',
        '0000',
        '0009done\n',
    ])
    with mock.patch('vcsserver.hooks.git_pre_pull', return_value=hooks.HookResponse(1, 'foo')):
        response = pygrack_app.post(
            '/git-upload-pack', params=request,
            content_type='application/x-git-upload-pack')

    data = io.BytesIO(response.body)
    proto = dulwich.protocol.Protocol(data.read, None)
    packets = list(proto.read_pkt_seq())

    expected_packets = [
        b'NAK\n', b'\x02foo', b'\x02Pre pull hook failed: aborting\n',
        b'\x01' + pygrack.GitRepository.EMPTY_PACK,
    ]
    assert packets == expected_packets


def test_pre_pull_hook_fails_no_sideband(pygrack_app):
    request = ''.join([
        '0054want 74730d410fcb6603ace96f1dc55ea6196122532d ' +
        'multi_ack ofs-delta\n'
        '0000',
        '0009done\n',
    ])
    with mock.patch('vcsserver.hooks.git_pre_pull',
                    return_value=hooks.HookResponse(1, 'foo')):
        response = pygrack_app.post(
            '/git-upload-pack', params=request,
            content_type='application/x-git-upload-pack')

    assert response.body == pygrack.GitRepository.EMPTY_PACK


def test_pull_has_hook_messages(pygrack_app):
    request = ''.join([
        '0054want 74730d410fcb6603ace96f1dc55ea6196122532d ' +
        'multi_ack side-band-64k ofs-delta\n'
        '0000',
        '0009done\n',
    ])

    pre_pull = 'pre_pull_output'
    post_pull = 'post_pull_output'

    with mock.patch('vcsserver.hooks.git_pre_pull',
                    return_value=hooks.HookResponse(0, pre_pull)):
        with mock.patch('vcsserver.hooks.git_post_pull',
                        return_value=hooks.HookResponse(1, post_pull)):
            with mock.patch('vcsserver.subprocessio.SubprocessIOChunker',
                            return_value=more_itertools.always_iterable([b'0008NAK\n0009subp\n0000'])):
                response = pygrack_app.post(
                    '/git-upload-pack', params=request,
                    content_type='application/x-git-upload-pack')

    data = io.BytesIO(response.body)
    proto = dulwich.protocol.Protocol(data.read, None)
    packets = list(proto.read_pkt_seq())

    assert packets == [b'NAK\n',
                       # pre-pull only outputs if IT FAILS as in != 0 ret code
                       #b'\x02pre_pull_output',
                       b'subp\n',
                       b'\x02post_pull_output']


def test_get_want_capabilities(pygrack_instance):
    data = io.BytesIO(
        b'0054want 74730d410fcb6603ace96f1dc55ea6196122532d ' +
        b'multi_ack side-band-64k ofs-delta\n00000009done\n')

    request = webob.Request({
        'wsgi.input': data,
        'REQUEST_METHOD': 'POST',
        'webob.is_body_seekable': True
    })

    capabilities = pygrack_instance._get_want_capabilities(request)

    assert capabilities == frozenset(
        (b'ofs-delta', b'multi_ack', b'side-band-64k'))
    assert data.tell() == 0


@pytest.mark.parametrize('data,capabilities,expected', [
    ('foo', [], []),
    ('', [pygrack.CAPABILITY_SIDE_BAND_64K], []),
    ('', [pygrack.CAPABILITY_SIDE_BAND], []),
    ('foo', [pygrack.CAPABILITY_SIDE_BAND_64K], [b'0008\x02foo']),
    ('foo', [pygrack.CAPABILITY_SIDE_BAND], [b'0008\x02foo']),
    ('f'*1000, [pygrack.CAPABILITY_SIDE_BAND_64K], [b'03ed\x02' + b'f' * 1000]),
    ('f'*1000, [pygrack.CAPABILITY_SIDE_BAND], [b'03e8\x02' + b'f' * 995, b'000a\x02fffff']),
    ('f'*65520, [pygrack.CAPABILITY_SIDE_BAND_64K], [b'fff0\x02' + b'f' * 65515, b'000a\x02fffff']),
    ('f'*65520, [pygrack.CAPABILITY_SIDE_BAND], [b'03e8\x02' + b'f' * 995] * 65 + [b'0352\x02' + b'f' * 845]),
], ids=[
    'foo-empty',
    'empty-64k', 'empty',
    'foo-64k', 'foo',
    'f-1000-64k', 'f-1000',
    'f-65520-64k', 'f-65520'])
def test_get_messages(pygrack_instance, data, capabilities, expected):
    messages = pygrack_instance._get_messages(data, capabilities)

    assert messages == expected


@pytest.mark.parametrize('response,capabilities,pre_pull_messages,post_pull_messages', [
    # Unexpected response
    ([b'unexpected_response[no_initial_header]'], [pygrack.CAPABILITY_SIDE_BAND_64K], 'foo', 'bar'),
    # No sideband
    ([b'no-sideband'], [], 'foo', 'bar'),
    # No messages
    ([b'no-messages'], [pygrack.CAPABILITY_SIDE_BAND_64K], '', ''),
])
def test_inject_messages_to_response_nothing_to_do(
        pygrack_instance, response, capabilities, pre_pull_messages, post_pull_messages):

    new_response = pygrack_instance._build_post_pull_response(
        more_itertools.always_iterable(response), capabilities, pre_pull_messages, post_pull_messages)

    assert list(new_response) == response


@pytest.mark.parametrize('capabilities', [
    [pygrack.CAPABILITY_SIDE_BAND],
    [pygrack.CAPABILITY_SIDE_BAND_64K],
])
def test_inject_messages_to_response_single_element(pygrack_instance, capabilities):
    response = [b'0008NAK\n0009subp\n0000']
    new_response = pygrack_instance._build_post_pull_response(
        more_itertools.always_iterable(response), capabilities, 'foo', 'bar')

    expected_response = b''.join([
        b'0008NAK\n',
        b'0008\x02foo',
        b'0009subp\n',
        b'0008\x02bar',
        b'0000'])

    assert b''.join(new_response) == expected_response


@pytest.mark.parametrize('capabilities', [
    [pygrack.CAPABILITY_SIDE_BAND],
    [pygrack.CAPABILITY_SIDE_BAND_64K],
])
def test_inject_messages_to_response_multi_element(pygrack_instance, capabilities):
    response = more_itertools.always_iterable([
        b'0008NAK\n000asubp1\n', b'000asubp2\n', b'000asubp3\n', b'000asubp4\n0000'
    ])
    new_response = pygrack_instance._build_post_pull_response(response, capabilities, 'foo', 'bar')

    expected_response = b''.join([
        b'0008NAK\n',
        b'0008\x02foo',
        b'000asubp1\n', b'000asubp2\n', b'000asubp3\n', b'000asubp4\n',
        b'0008\x02bar',
        b'0000'
    ])

    assert b''.join(new_response) == expected_response


def test_build_failed_pre_pull_response_no_sideband(pygrack_instance):
    response = pygrack_instance._build_failed_pre_pull_response([], 'foo')

    assert response == [pygrack.GitRepository.EMPTY_PACK]


@pytest.mark.parametrize('capabilities', [
    [pygrack.CAPABILITY_SIDE_BAND],
    [pygrack.CAPABILITY_SIDE_BAND_64K],
    [pygrack.CAPABILITY_SIDE_BAND_64K, b'no-progress'],
])
def test_build_failed_pre_pull_response(pygrack_instance, capabilities):
    response = pygrack_instance._build_failed_pre_pull_response(capabilities, 'foo')

    expected_response = [
        b'0008NAK\n', b'0008\x02foo', b'0024\x02Pre pull hook failed: aborting\n',
        b'%04x\x01%s' % (len(pygrack.GitRepository.EMPTY_PACK) + 5, pygrack.GitRepository.EMPTY_PACK),
        pygrack.GitRepository.FLUSH_PACKET,
    ]

    assert response == expected_response


def test_inject_messages_to_response_generator(pygrack_instance):

    def response_generator():
        response = [
            # protocol start
            b'0008NAK\n',
        ]
        response += [ascii_bytes(f'000asubp{x}\n') for x in range(1000)]
        response += [
            # protocol end
            pygrack.GitRepository.FLUSH_PACKET
        ]
        for elem in response:
            yield elem

    new_response = pygrack_instance._build_post_pull_response(
        response_generator(), [pygrack.CAPABILITY_SIDE_BAND_64K, b'no-progress'], 'PRE_PULL_MSG\n', 'POST_PULL_MSG\n')

    assert iter(new_response)

    expected_response = b''.join([
        # start
        b'0008NAK\n0012\x02PRE_PULL_MSG\n',
    ] + [
        # ... rest
        ascii_bytes(f'000asubp{x}\n') for x in range(1000)
    ] + [
        # final message,
        b'0013\x02POST_PULL_MSG\n0000',

    ])

    assert b''.join(new_response) == expected_response