import os

import pytest
from mock import mock

from modules.repos import lib
from modules.repos.errors import InvalidRepo, RepoConflict
from modules.repos.models import Repository
from wrolpi.collections.models import Collection
from wrolpi.common import get_wrolpi_config
from wrolpi.downloader import Download, DownloadFrequency
from wrolpi.errors import UnknownDirectory, ValidationError
from wrolpi.files.models import FileGroup


@pytest.mark.parametrize('url,expected', [
    ('https://github.com/kiwix/kiwix-tools',
     lib.ParsedRepoURL('https://github.com/kiwix/kiwix-tools', 'github.com', 'kiwix', 'kiwix-tools')),
    ('https://GitHub.com/kiwix/kiwix-tools.git/',
     lib.ParsedRepoURL('https://github.com/kiwix/kiwix-tools.git', 'github.com', 'kiwix', 'kiwix-tools')),
    ('https://github.com/kiwix/kiwix-tools/tree/feature/x',
     lib.ParsedRepoURL('https://github.com/kiwix/kiwix-tools', 'github.com', 'kiwix', 'kiwix-tools', 'feature/x')),
    ('https://gitlab.com/group/sub/project/-/tree/dev',
     lib.ParsedRepoURL('https://gitlab.com/group/sub/project', 'gitlab.com', 'group/sub', 'project', 'dev')),
    ('https://git.example.com:8443/project',
     lib.ParsedRepoURL('https://git.example.com:8443/project', 'git.example.com', '', 'project')),
])
def test_parse_repo_url(url, expected):
    assert lib.parse_repo_url(url) == expected


@pytest.mark.parametrize('url', [
    'http://github.com/kiwix/kiwix-tools',
    'git@github.com:kiwix/kiwix-tools.git',
    'ssh://git@github.com/kiwix/kiwix-tools',
    'file:///etc',
    'https://user:token@github.com/kiwix/kiwix-tools',
    'https://github.com/kiwix/kiwix-tools?tab=readme',
    'https://github.com',
    'https://github.com/a/..',
    'https://github.com/../b',
    'https://github.com/a/./b',
    '',
])
def test_parse_repo_url_invalid(url):
    with pytest.raises(InvalidRepo):
        lib.parse_repo_url(url)


def test_repo_url_key():
    assert lib.repo_url_key('https://GitHub.com/a/b.git/') == lib.repo_url_key('https://github.com/a/b')
    assert lib.repo_url_key('https://github.com/a/b') != lib.repo_url_key('https://github.com/a/c')


def test_git_command_is_restricted():
    cmd = lib.git_command('clone', 'https://example.com/a')
    assert 'protocol.allow=never' in cmd
    assert 'protocol.https.allow=always' in cmd
    assert 'core.symlinks=false' in cmd
    assert 'core.hooksPath=/dev/null' in cmd
    assert cmd[-2:] == ('clone', 'https://example.com/a')
    assert lib.git_env()['GIT_TERMINAL_PROMPT'] == '0'


@pytest.mark.asyncio
async def test_create_repository(test_session, test_directory, test_wrolpi_config, async_client):
    repo = lib.create_repository(test_session, 'https://github.com/kiwix/kiwix-tools', tag_name='software')

    collection = test_session.query(Collection).one()
    assert collection.kind == 'repo'
    assert collection.name == 'kiwix-tools'
    assert collection.tag_name == 'software'
    assert collection.directory == test_directory / 'repos/software/kiwix-tools'
    assert repo.collection_id == collection.id
    assert (repo.url, repo.host, repo.owner, repo.mode, repo.branch) == \
           ('https://github.com/kiwix/kiwix-tools', 'github.com', 'kiwix', 'full', None)

    # Repos are always kept up to date; weekly by default.
    download = test_session.query(Download).one()
    assert download.url == repo.url
    assert download.downloader == 'git'
    assert download.frequency == DownloadFrequency.weekly
    assert download.collection_id == collection.id
    assert repo.download == download

    # Without a tag.
    repo = lib.create_repository(test_session, 'https://github.com/kiwix/libkiwix')
    assert repo.directory == test_directory / 'repos/libkiwix'


@pytest.mark.asyncio
async def test_create_repository_conflicts(test_session, test_wrolpi_config, async_client):
    lib.create_repository(test_session, 'https://github.com/a/utils')

    # The same repo, even with `.git`.
    with pytest.raises(RepoConflict):
        lib.create_repository(test_session, 'https://github.com/a/utils.git')

    # Another owner's repo with the same name; a new name is suggested.
    with pytest.raises(RepoConflict) as e:
        lib.create_repository(test_session, 'https://github.com/b/utils')
    assert "'b-utils'" in str(e.value)
    test_session.rollback()

    repo = lib.create_repository(test_session, 'https://github.com/b/utils', name='b-utils')
    assert repo.name == 'b-utils'
    assert test_session.query(Repository).count() == 2


@pytest.mark.asyncio
async def test_create_repository_invalid(test_session, test_wrolpi_config, async_client):
    with pytest.raises(InvalidRepo):
        lib.create_repository(test_session, 'http://github.com/a/b')
    with pytest.raises(Exception):
        lib.create_repository(test_session, 'https://github.com/a/b', mode='bare')
    with pytest.raises(Exception):
        lib.create_repository(test_session, 'https://github.com/a/b', frequency=0)


@pytest.mark.asyncio
async def test_repos_destination(test_session, test_directory, test_wrolpi_config, async_client):
    """The repos destination can use the repo's owner and host."""
    get_wrolpi_config().repos_destination = 'repos/%(repo_host)s/%(repo_owner)s/%(repo_name)s'
    repo = lib.create_repository(test_session, 'https://gitlab.com/group/sub/project')
    assert repo.directory == test_directory / 'repos/gitlab.com/group⧸sub/project'

    get_wrolpi_config().repos_destination = 'repos/%(tag_name)s/%(repo_name)s'
    repo = lib.create_repository(test_session, 'https://github.com/a/b', tag_name='Tag')
    assert repo.directory == test_directory / 'repos/Tag/b'


@pytest.mark.asyncio
async def test_update_repository(test_session, test_wrolpi_config, async_client):
    repo = lib.create_repository(test_session, 'https://github.com/a/b', branch='dev')
    lib.update_repository(test_session, repo.id, description='My repo', frequency=DownloadFrequency.daily,
                          mode='snapshot', branch='')
    assert repo.collection.description == 'My repo'
    assert repo.download.frequency == DownloadFrequency.daily
    assert repo.mode == 'snapshot'
    # An empty branch follows the default branch.
    assert repo.branch is None


@pytest.mark.asyncio
async def test_delete_repository(test_session, test_directory, test_wrolpi_config, await_background_tasks,
                                 async_client):
    keep = lib.create_repository(test_session, 'https://github.com/a/keep')
    delete = lib.create_repository(test_session, 'https://github.com/a/delete')
    for repo in (keep, delete):
        repo.directory.mkdir(parents=True)
        (repo.directory / 'README.md').write_text('readme')
    keep_directory, delete_directory = keep.directory, delete.directory

    await lib.delete_repository(test_session, keep.id)
    await lib.delete_repository(test_session, delete.id, delete_files=True)
    await await_background_tasks()

    assert test_session.query(Repository).count() == 0
    assert test_session.query(Collection).count() == 0
    assert test_session.query(Download).count() == 0
    # Files are kept by default.
    assert (keep_directory / 'README.md').is_file()
    assert not delete_directory.exists()


@pytest.mark.asyncio
async def test_list_repo_tree(test_session, test_directory, test_wrolpi_config, async_client):
    repo = lib.create_repository(test_session, 'https://github.com/a/b')
    with pytest.raises(UnknownDirectory):
        lib.list_repo_tree(repo)

    root = repo.directory
    (root / '.git').mkdir(parents=True)
    (root / 'src/lib').mkdir(parents=True)
    (root / 'src/Readme.rst').write_text('src')
    (root / 'README.md').write_text('# B')
    (root / 'a.txt').write_text('aaa')
    (root / 'Docs').mkdir()

    tree = lib.list_repo_tree(repo)
    assert tree == dict(
        path='',
        readme_path='README.md',
        entries=[
            dict(name='Docs', path='Docs', is_dir=True, size=None),
            dict(name='src', path='src', is_dir=True, size=None),
            dict(name='a.txt', path='a.txt', is_dir=False, size=3),
            dict(name='README.md', path='README.md', is_dir=False, size=3),
        ],
    )

    tree = lib.list_repo_tree(repo, '/src/')
    assert tree['path'] == 'src'
    assert tree['readme_path'] == 'src/Readme.rst'
    assert [i['path'] for i in tree['entries']] == ['src/lib', 'src/Readme.rst']

    with pytest.raises(InvalidRepo):
        lib.list_repo_tree(repo, '../..')
    with pytest.raises(UnknownDirectory):
        lib.list_repo_tree(repo, 'missing')


@pytest.mark.asyncio
async def test_repos_directory_is_ignored(test_session, test_directory, test_wrolpi_config, refresh_files):
    """Files in the repos directory are never indexed, even when an old config does not ignore it."""
    config = get_wrolpi_config()
    config.ignored_directories = ['config']
    config.import_config()
    assert 'repos' in config.ignored_directories

    (test_directory / 'repos/a/b').mkdir(parents=True)
    (test_directory / 'repos/a/b/README.md').write_text('# B')
    (test_directory / 'other.txt').write_text('other')
    await refresh_files()

    assert [i.primary_path.name for i in test_session.query(FileGroup)] == ['other.txt']


@pytest.mark.parametrize('branch,valid', [
    ('main', True),
    ('feature/x-1', True),
    ('release-1.2', True),
    ('--upload-pack=touch /tmp/pwned', False),
    ('-b', False),
    ('a..b', False),
    ('a b', False),
    ('a~1', False),
    ('a^', False),
    ('a:b', False),
    ('a?', False),
    ('a*', False),
    ('a[', False),
    ('a\\b', False),
    ('a@{1}', False),
    ('@', False),
    ('a/', False),
    ('/a', False),
    ('a//b', False),
    ('a.lock', False),
    ('a/.b', False),
    ('a.', False),
    ('a\x00b', False),
    ('', False),
])
def test_is_valid_branch(branch, valid):
    assert lib.is_valid_branch(branch) is valid


@pytest.mark.asyncio
async def test_invalid_branch_rejected(test_session, async_client, test_wrolpi_config):
    """A branch is passed to git, it must never be read as an option."""
    with pytest.raises(ValidationError):
        lib.create_repository(test_session, 'https://github.com/a/b', branch='--upload-pack=x')
    with pytest.raises(ValidationError):
        lib.create_repository(test_session, 'https://github.com/a/b/tree/a..b')
    repo = lib.create_repository(test_session, 'https://github.com/a/b')
    with pytest.raises(ValidationError):
        lib.update_repository(test_session, repo.id, branch='-x')


@pytest.mark.asyncio
async def test_repo_directory_traversal(test_session, test_directory, async_client, test_wrolpi_config):
    """A Repo's directory is always strictly inside the media directory, and never escapes its template."""
    for name in ('..', '.', ' '):
        with pytest.raises(InvalidRepo):
            lib.create_repository(test_session, 'https://github.com/a/b', tag_name='tag', name=name)
        test_session.rollback()

    with pytest.raises(InvalidRepo):
        lib.create_repository(test_session, 'https://github.com/a/b', directory=test_directory / 'repos/../../etc')
    test_session.rollback()
    with pytest.raises(InvalidRepo):
        lib.create_repository(test_session, 'https://github.com/a/b', directory=test_directory)
    test_session.rollback()

    # The config can not move an existing Repo outside the media directory.
    lib.create_repository(test_session, 'https://github.com/a/b')
    with pytest.raises(InvalidRepo):
        lib.ReposConfig._import_repo(test_session, dict(url='https://github.com/a/b', directory='../outside'))
    test_session.rollback()
    assert test_session.query(Repository).one().directory == test_directory / 'repos/b'


def test_git_env_is_not_inherited():
    """The process environment cannot undo git_command's restrictions."""
    hostile = dict(
        GIT_ALLOW_PROTOCOL='file', GIT_CONFIG_COUNT='1', GIT_CONFIG_KEY_0='url.https://127.0.0.1/.insteadOf',
        GIT_CONFIG_VALUE_0='https://example.com/', GIT_CONFIG_PARAMETERS="'protocol.allow'='always'",
        GIT_SSL_NO_VERIFY='1', GIT_PROXY_COMMAND='evil', GIT_SSH_COMMAND='evil', HTTPS_PROXY='http://127.0.0.1:9',
        https_proxy='http://127.0.0.1:9', CURL_CA_BUNDLE='/tmp/evil.pem', GIT_DIR='/tmp/evil',
    )
    with mock.patch.dict(os.environ, dict(hostile, PATH='/usr/bin:/bin', SSL_CERT_FILE='/etc/ssl/cert.pem')):
        env = lib.git_env()
    assert not set(hostile) & set(env), set(hostile) & set(env)
    assert env['PATH'] == '/usr/bin:/bin'
    assert env['SSL_CERT_FILE'] == '/etc/ssl/cert.pem'
    assert env['GIT_TERMINAL_PROMPT'] == '0'


def test_git_command_ignores_hostile_environment(tmp_path):
    """With git's environment variables set against it, git still refuses file:// (only https is allowed)."""
    import subprocess
    origin = tmp_path / 'origin'
    subprocess.run(['git', 'init', '--quiet', str(origin)], check=True)
    with mock.patch.dict(os.environ, dict(GIT_ALLOW_PROTOCOL='file')):
        result = subprocess.run(lib.git_command('ls-remote', f'file://{origin}'), env=lib.git_env(),
                                capture_output=True)
    assert result.returncode != 0
    assert b"transport 'file' not allowed" in result.stderr