import collections
import logging
import os
import subprocess
import textwrap

import pytest
from mock import patch
from pip._vendor.six import PY2
from pretend import stub

import pip._internal.req.req_file  # this will be monkeypatched
from pip._internal.exceptions import InstallationError, RequirementsFileParseError
from pip._internal.models.format_control import FormatControl
from pip._internal.network.session import PipSession
from pip._internal.req.constructors import (
    install_req_from_editable,
    install_req_from_line,
    install_req_from_parsed_requirement,
)
from pip._internal.req.req_file import (
    break_args_options,
    ignore_comments,
    join_lines,
    parse_requirements,
    preprocess,
)
from tests.lib import make_test_finder, requirements_file


@pytest.fixture
def session():
    return PipSession()


@pytest.fixture
def finder(session):
    return make_test_finder(session=session)


@pytest.fixture
def options(session):
    return stub(
        isolated_mode=False,
        index_url='default_url',
        format_control=FormatControl(set(), set()),
        features_enabled=[],
    )


def parse_reqfile(
    filename,
    session,
    finder=None,
    options=None,
    constraint=False,
    isolated=False,
):
    # Wrap parse_requirements/install_req_from_parsed_requirement to
    # avoid having to write the same chunk of code in lots of tests.
    for parsed_req in parse_requirements(
        filename, session, finder=finder,
        options=options, constraint=constraint,
    ):
        yield install_req_from_parsed_requirement(
            parsed_req,
            isolated=isolated
        )


class TestPreprocess(object):
    """tests for `preprocess`"""

    def test_comments_and_joins_case1(self):
        content = textwrap.dedent("""\
          req1 \\
          # comment \\
          req2
        """)
        result = preprocess(content)
        assert list(result) == [(1, 'req1'), (3, 'req2')]

    def test_comments_and_joins_case2(self):
        content = textwrap.dedent("""\
          req1\\
          # comment
        """)
        result = preprocess(content)
        assert list(result) == [(1, 'req1')]

    def test_comments_and_joins_case3(self):
        content = textwrap.dedent("""\
          req1 \\
          # comment
          req2
        """)
        result = preprocess(content)
        assert list(result) == [(1, 'req1'), (3, 'req2')]


class TestIgnoreComments(object):
    """tests for `ignore_comment`"""

    def test_ignore_line(self):
        lines = [(1, ''), (2, 'req1'), (3, 'req2')]
        result = ignore_comments(lines)
        assert list(result) == [(2, 'req1'), (3, 'req2')]

    def test_ignore_comment(self):
        lines = [(1, 'req1'), (2, '# comment'), (3, 'req2')]
        result = ignore_comments(lines)
        assert list(result) == [(1, 'req1'), (3, 'req2')]

    def test_strip_comment(self):
        lines = [(1, 'req1'), (2, 'req # comment'), (3, 'req2')]
        result = ignore_comments(lines)
        assert list(result) == [(1, 'req1'), (2, 'req'), (3, 'req2')]


class TestJoinLines(object):
    """tests for `join_lines`"""

    def test_join_lines(self):
        lines = enumerate([
            'line 1',
            'line 2:1 \\',
            'line 2:2',
            'line 3:1 \\',
            'line 3:2 \\',
            'line 3:3',
            'line 4'
        ], start=1)
        expect = [
            (1, 'line 1'),
            (2, 'line 2:1 line 2:2'),
            (4, 'line 3:1 line 3:2 line 3:3'),
            (7, 'line 4'),
        ]
        assert expect == list(join_lines(lines))

    def test_last_line_with_escape(self):
        lines = enumerate([
            'line 1',
            'line 2 \\',
        ], start=1)
        expect = [
            (1, 'line 1'),
            (2, 'line 2 '),
        ]
        assert expect == list(join_lines(lines))


@pytest.fixture
def line_processor(
    monkeypatch,
    tmpdir,
):
    def process_line(
        line,
        filename,
        line_number,
        finder=None,
        options=None,
        session=None,
        constraint=False,
    ):
        if session is None:
            session = PipSession()

        prefix = '\n' * (line_number - 1)
        path = tmpdir.joinpath(filename)
        path.parent.mkdir(exist_ok=True)
        path.write_text(prefix + line)
        monkeypatch.chdir(str(tmpdir))
        return list(parse_reqfile(
            filename,
            finder=finder,
            options=options,
            session=session,
            constraint=constraint,
            isolated=options.isolated_mode if options else False
        ))

    return process_line


class TestProcessLine(object):
    """tests for `process_line`"""

    def test_parser_error(self, line_processor):
        with pytest.raises(RequirementsFileParseError):
            line_processor("--bogus", "file", 1)

    def test_parser_offending_line(self, line_processor):
        line = 'pkg==1.0.0 --hash=somehash'
        with pytest.raises(RequirementsFileParseError) as err:
            line_processor(line, 'file', 1)
        assert line in str(err.value)

    def test_parser_non_offending_line(self, line_processor):
        try:
            line_processor('pkg==1.0.0 --hash=sha256:somehash', 'file', 1)
        except RequirementsFileParseError:
            pytest.fail('Reported offending line where it should not.')

    def test_only_one_req_per_line(self, line_processor):
        # pkg_resources raises the ValueError
        with pytest.raises(InstallationError):
            line_processor("req1 req2", "file", 1)

    def test_error_message(self, line_processor):
        """
        Test the error message if a parsing error occurs (all of path,
        line number, and hint).
        """
        with pytest.raises(InstallationError) as exc:
            line_processor(
                'my-package=1.0',
                filename='path/requirements.txt',
                line_number=3
            )

        package_name = "u'my-package=1.0'" if PY2 else "'my-package=1.0'"
        expected = (
            "Invalid requirement: {} "
            '(from line 3 of path/requirements.txt)\n'
            'Hint: = is not a valid operator. Did you mean == ?'
        ).format(package_name)
        assert str(exc.value) == expected

    def test_yield_line_requirement(self, line_processor):
        line = 'SomeProject'
        filename = 'filename'
        comes_from = '-r {} (line {})'.format(filename, 1)
        req = install_req_from_line(line, comes_from=comes_from)
        assert repr(line_processor(line, filename, 1)[0]) == repr(req)

    def test_yield_pep440_line_requirement(self, line_processor):
        line = 'SomeProject @ https://url/SomeProject-py2-py3-none-any.whl'
        filename = 'filename'
        comes_from = '-r {} (line {})'.format(filename, 1)
        req = install_req_from_line(line, comes_from=comes_from)
        assert repr(line_processor(line, filename, 1)[0]) == repr(req)

    def test_yield_line_constraint(self, line_processor):
        line = 'SomeProject'
        filename = 'filename'
        comes_from = '-c {} (line {})'.format(filename, 1)
        req = install_req_from_line(
            line, comes_from=comes_from, constraint=True)
        found_req = line_processor(line, filename, 1, constraint=True)[0]
        assert repr(found_req) == repr(req)
        assert found_req.constraint is True

    def test_yield_line_requirement_with_spaces_in_specifier(
        self, line_processor
    ):
        line = 'SomeProject >= 2'
        filename = 'filename'
        comes_from = '-r {} (line {})'.format(filename, 1)
        req = install_req_from_line(line, comes_from=comes_from)
        assert repr(line_processor(line, filename, 1)[0]) == repr(req)
        assert str(req.req.specifier) == '>=2'

    def test_yield_editable_requirement(self, line_processor):
        url = 'git+https://url#egg=SomeProject'
        line = '-e {url}'.format(**locals())
        filename = 'filename'
        comes_from = '-r {} (line {})'.format(filename, 1)
        req = install_req_from_editable(url, comes_from=comes_from)
        assert repr(line_processor(line, filename, 1)[0]) == repr(req)

    def test_yield_editable_constraint(self, line_processor):
        url = 'git+https://url#egg=SomeProject'
        line = '-e {}'.format(url)
        filename = 'filename'
        comes_from = '-c {} (line {})'.format(filename, 1)
        req = install_req_from_editable(
            url, comes_from=comes_from, constraint=True)
        found_req = line_processor(line, filename, 1, constraint=True)[0]
        assert repr(found_req) == repr(req)
        assert found_req.constraint is True

    def test_nested_constraints_file(self, monkeypatch, tmpdir):
        req_name = 'hello'
        req_file = tmpdir / 'parent' / 'req_file.txt'
        req_file.parent.mkdir()
        req_file.write_text('-c reqs.txt')
        req_file.parent.joinpath('reqs.txt').write_text(req_name)

        monkeypatch.chdir(str(tmpdir))

        reqs = list(
            parse_reqfile('./parent/req_file.txt', session=session)
        )
        assert len(reqs) == 1
        assert reqs[0].name == req_name
        assert reqs[0].constraint

    def test_options_on_a_requirement_line(self, line_processor):
        line = 'SomeProject --install-option=yo1 --install-option yo2 '\
               '--global-option="yo3" --global-option "yo4"'
        filename = 'filename'
        req = line_processor(line, filename, 1)[0]
        assert req.global_options == ['yo3', 'yo4']
        assert req.install_options == ['yo1', 'yo2']

    def test_hash_options(self, line_processor):
        """Test the --hash option: mostly its value storage.

        Make sure it reads and preserve multiple hashes.

        """
        line = ('SomeProject --hash=sha256:2cf24dba5fb0a30e26e83b2ac5b9e29e1b1'
                '61e5c1fa7425e73043362938b9824 '
                '--hash=sha384:59e1748777448c69de6b800d7a33bbfb9ff1b463e44354c'
                '3553bcdb9c666fa90125a3c79f90397bdf5f6a13de828684f '
                '--hash=sha256:486ea46224d1bb4fb680f34f7c9ad96a8f24ec88be73ea8'
                'e5a6c65260e9cb8a7')
        filename = 'filename'
        req = line_processor(line, filename, 1)[0]
        assert req.hash_options == {
            'sha256': ['2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e730433'
                       '62938b9824',
                       '486ea46224d1bb4fb680f34f7c9ad96a8f24ec88be73ea8e5a6c65'
                       '260e9cb8a7'],
            'sha384': ['59e1748777448c69de6b800d7a33bbfb9ff1b463e44354c3553bcd'
                       'b9c666fa90125a3c79f90397bdf5f6a13de828684f']}

    def test_set_isolated(self, line_processor, options):
        line = 'SomeProject'
        filename = 'filename'
        options.isolated_mode = True
        result = line_processor(line, filename, 1, options=options)
        assert result[0].isolated

    def test_set_finder_no_index(self, line_processor, finder):
        line_processor("--no-index", "file", 1, finder=finder)
        assert finder.index_urls == []

    def test_set_finder_index_url(self, line_processor, finder, session):
        line_processor(
            "--index-url=url", "file", 1, finder=finder, session=session)
        assert finder.index_urls == ['url']
        assert session.auth.index_urls == ['url']

    def test_set_finder_find_links(self, line_processor, finder):
        line_processor("--find-links=url", "file", 1, finder=finder)
        assert finder.find_links == ['url']

    def test_set_finder_extra_index_urls(
            self, line_processor, finder, session):
        line_processor(
            "--extra-index-url=url", "file", 1, finder=finder, session=session)
        assert finder.index_urls == ['url']
        assert session.auth.index_urls == ['url']

    def test_set_finder_trusted_host(
        self, line_processor, caplog, session, finder
    ):
        with caplog.at_level(logging.INFO):
            line_processor(
                "--trusted-host=host1 --trusted-host=host2:8080",
                "file.txt", 1, finder=finder, session=session,
            )
        assert list(finder.trusted_hosts) == ['host1', 'host2:8080']
        session = finder._link_collector.session
        assert (
            session.adapters['https://host1/']
            is session._trusted_host_adapter
        )
        assert (
            session.adapters['https://host2:8080/']
            is session._trusted_host_adapter
        )

        # Test the log message.
        actual = [(r.levelname, r.message) for r in caplog.records]
        expected = (
            'INFO', "adding trusted host: 'host1' (from line 1 of file.txt)"
        )
        assert expected in actual

    def test_set_finder_allow_all_prereleases(self, line_processor, finder):
        line_processor("--pre", "file", 1, finder=finder)
        assert finder.allow_all_prereleases

    def test_use_feature(self, line_processor, options):
        """--use-feature can be set in requirements files."""
        line_processor(
            "--use-feature=2020-resolver", "filename", 1, options=options
        )
        assert "2020-resolver" in options.features_enabled

    def test_relative_local_find_links(
        self, line_processor, finder, monkeypatch, tmpdir
    ):
        """
        Test a relative find_links path is joined with the req file directory
        """
        base_path = tmpdir / 'path'

        def normalize(path):
            return os.path.normcase(
                os.path.abspath(os.path.normpath(str(path)))
            )

        # Make sure the test also passes on windows
        req_file = normalize(base_path / 'req_file.txt')
        nested_link = normalize(base_path / 'rel_path')
        exists_ = os.path.exists

        def exists(path):
            if path == nested_link:
                return True
            else:
                exists_(path)

        monkeypatch.setattr(os.path, 'exists', exists)
        line_processor("--find-links=rel_path", req_file, 1, finder=finder)
        assert finder.find_links == [nested_link]

    def test_relative_http_nested_req_files(
        self, finder, session, monkeypatch
    ):
        """
        Test a relative nested req file path is joined with the req file url
        """
        req_name = 'hello'
        req_file = 'http://me.com/me/req_file.txt'

        def get_file_content(filename, *args, **kwargs):
            if filename == req_file:
                return None, '-r reqs.txt'
            elif filename == 'http://me.com/me/reqs.txt':
                return None, req_name
            assert False, 'Unexpected file requested {}'.format(filename)

        monkeypatch.setattr(
            pip._internal.req.req_file, 'get_file_content', get_file_content
        )

        result = list(parse_reqfile(req_file, session=session))
        assert len(result) == 1
        assert result[0].name == req_name
        assert not result[0].constraint

    def test_relative_local_nested_req_files(
        self, session, monkeypatch, tmpdir
    ):
        """
        Test a relative nested req file path is joined with the req file dir
        """
        req_name = 'hello'
        req_file = tmpdir / 'parent' / 'req_file.txt'
        req_file.parent.mkdir()
        req_file.write_text('-r reqs.txt')
        req_file.parent.joinpath('reqs.txt').write_text(req_name)

        monkeypatch.chdir(str(tmpdir))

        reqs = list(
            parse_reqfile('./parent/req_file.txt', session=session)
        )
        assert len(reqs) == 1
        assert reqs[0].name == req_name
        assert not reqs[0].constraint

    def test_absolute_local_nested_req_files(
        self, session, monkeypatch, tmpdir
    ):
        """
        Test an absolute nested req file path
        """
        req_name = 'hello'
        req_file = tmpdir / 'parent' / 'req_file.txt'
        req_file.parent.mkdir()
        other_req_file = tmpdir / 'other' / 'reqs.txt'
        other_req_file.parent.mkdir()
        # POSIX-ify the path, since Windows backslashes aren't supported.
        other_req_file_str = str(other_req_file).replace('\\', '/')

        req_file.write_text('-r {}'.format(other_req_file_str))
        other_req_file.write_text(req_name)

        reqs = list(parse_reqfile(str(req_file), session=session))
        assert len(reqs) == 1
        assert reqs[0].name == req_name
        assert not reqs[0].constraint

    def test_absolute_http_nested_req_file_in_local(
        self, session, monkeypatch, tmpdir
    ):
        """
        Test a nested req file url in a local req file
        """
        req_name = 'hello'
        req_file = tmpdir / 'req_file.txt'
        nested_req_file = 'http://me.com/me/req_file.txt'

        def get_file_content(filename, *args, **kwargs):
            if filename == str(req_file):
                return None, '-r {}'.format(nested_req_file)
            elif filename == nested_req_file:
                return None, req_name
            assert False, 'Unexpected file requested {}'.format(filename)

        monkeypatch.setattr(
            pip._internal.req.req_file, 'get_file_content', get_file_content
        )

        result = list(parse_reqfile(req_file, session=session))
        assert len(result) == 1
        assert result[0].name == req_name
        assert not result[0].constraint


class TestBreakOptionsArgs(object):

    def test_no_args(self):
        assert ('', '--option') == break_args_options('--option')

    def test_no_options(self):
        assert ('arg arg', '') == break_args_options('arg arg')

    def test_args_short_options(self):
        result = break_args_options('arg arg -s')
        assert ('arg arg', '-s') == result

    def test_args_long_options(self):
        result = break_args_options('arg arg --long')
        assert ('arg arg', '--long') == result


class TestOptionVariants(object):

    # this suite is really just testing optparse, but added it anyway

    def test_variant1(self, line_processor, finder):
        line_processor("-i url", "file", 1, finder=finder)
        assert finder.index_urls == ['url']

    def test_variant2(self, line_processor, finder):
        line_processor("-i 'url'", "file", 1, finder=finder)
        assert finder.index_urls == ['url']

    def test_variant3(self, line_processor, finder):
        line_processor("--index-url=url", "file", 1, finder=finder)
        assert finder.index_urls == ['url']

    def test_variant4(self, line_processor, finder):
        line_processor("--index-url url", "file", 1, finder=finder)
        assert finder.index_urls == ['url']

    def test_variant5(self, line_processor, finder):
        line_processor("--index-url='url'", "file", 1, finder=finder)
        assert finder.index_urls == ['url']


class TestParseRequirements(object):
    """tests for `parse_reqfile`"""

    @pytest.mark.network
    def test_remote_reqs_parse(self):
        """
        Test parsing a simple remote requirements file
        """
        # this requirements file just contains a comment previously this has
        # failed in py3: https://github.com/pypa/pip/issues/760
        for _ in parse_reqfile(
                'https://raw.githubusercontent.com/pypa/'
                'pip-test-package/master/'
                'tests/req_just_comment.txt', session=PipSession()):
            pass

    def test_multiple_appending_options(self, tmpdir, finder, options):
        with open(tmpdir.joinpath("req1.txt"), "w") as fp:
            fp.write("--extra-index-url url1 \n")
            fp.write("--extra-index-url url2 ")

        list(parse_reqfile(tmpdir.joinpath("req1.txt"), finder=finder,
                           session=PipSession(), options=options))

        assert finder.index_urls == ['url1', 'url2']

    def test_expand_existing_env_variables(self, tmpdir, finder):
        template = (
            'https://{}:x-oauth-basic@github.com/'
            'user/{}/archive/master.zip'
        )

        def make_var(name):
            return '${{{name}}}'.format(**locals())

        env_vars = collections.OrderedDict([
            ('GITHUB_TOKEN', 'notarealtoken'),
            ('DO_12_FACTOR', 'awwyeah'),
        ])

        with open(tmpdir.joinpath('req1.txt'), 'w') as fp:
            fp.write(template.format(*map(make_var, env_vars)))

        with patch('pip._internal.req.req_file.os.getenv') as getenv:
            getenv.side_effect = lambda n: env_vars[n]

            reqs = list(parse_reqfile(
                tmpdir.joinpath('req1.txt'),
                finder=finder,
                session=PipSession()
            ))

        assert len(reqs) == 1, \
            'parsing requirement file with env variable failed'

        expected_url = template.format(*env_vars.values())
        assert reqs[0].link.url == expected_url, \
            'variable expansion in req file failed'

    def test_expand_missing_env_variables(self, tmpdir, finder):
        req_url = (
            'https://${NON_EXISTENT_VARIABLE}:$WRONG_FORMAT@'
            '%WINDOWS_FORMAT%github.com/user/repo/archive/master.zip'
        )

        with open(tmpdir.joinpath('req1.txt'), 'w') as fp:
            fp.write(req_url)

        with patch('pip._internal.req.req_file.os.getenv') as getenv:
            getenv.return_value = ''

            reqs = list(parse_reqfile(
                tmpdir.joinpath('req1.txt'),
                finder=finder,
                session=PipSession()
            ))

            assert len(reqs) == 1, \
                'parsing requirement file with env variable failed'
            assert reqs[0].link.url == req_url, \
                'ignoring invalid env variable in req file failed'

    def test_join_lines(self, tmpdir, finder):
        with open(tmpdir.joinpath("req1.txt"), "w") as fp:
            fp.write("--extra-index-url url1 \\\n--extra-index-url url2")

        list(parse_reqfile(tmpdir.joinpath("req1.txt"), finder=finder,
                           session=PipSession()))

        assert finder.index_urls == ['url1', 'url2']

    def test_req_file_parse_no_only_binary(self, data, finder):
        list(parse_reqfile(
            data.reqfiles.joinpath("supported_options2.txt"),
            finder=finder,
            session=PipSession()))
        expected = FormatControl({'fred'}, {'wilma'})
        assert finder.format_control == expected

    def test_req_file_parse_comment_start_of_line(self, tmpdir, finder):
        """
        Test parsing comments in a requirements file
        """
        with open(tmpdir.joinpath("req1.txt"), "w") as fp:
            fp.write("# Comment ")

        reqs = list(parse_reqfile(tmpdir.joinpath("req1.txt"),
                    finder=finder,
                    session=PipSession()))

        assert not reqs

    def test_req_file_parse_comment_end_of_line_with_url(self, tmpdir, finder):
        """
        Test parsing comments in a requirements file
        """
        with open(tmpdir.joinpath("req1.txt"), "w") as fp:
            fp.write("https://example.com/foo.tar.gz # Comment ")

        reqs = list(parse_reqfile(tmpdir.joinpath("req1.txt"),
                    finder=finder,
                    session=PipSession()))

        assert len(reqs) == 1
        assert reqs[0].link.url == "https://example.com/foo.tar.gz"

    def test_req_file_parse_egginfo_end_of_line_with_url(self, tmpdir, finder):
        """
        Test parsing comments in a requirements file
        """
        with open(tmpdir.joinpath("req1.txt"), "w") as fp:
            fp.write("https://example.com/foo.tar.gz#egg=wat")

        reqs = list(parse_reqfile(tmpdir.joinpath("req1.txt"),
                    finder=finder,
                    session=PipSession()))

        assert len(reqs) == 1
        assert reqs[0].name == "wat"

    def test_req_file_no_finder(self, tmpdir):
        """
        Test parsing a requirements file without a finder
        """
        with open(tmpdir.joinpath("req.txt"), "w") as fp:
            fp.write("""
    --find-links https://example.com/
    --index-url https://example.com/
    --extra-index-url https://two.example.com/
    --no-use-wheel
    --no-index
            """)

        parse_reqfile(tmpdir.joinpath("req.txt"), session=PipSession())

    def test_install_requirements_with_options(self, tmpdir, finder, session,
                                               options):
        global_option = '--dry-run'
        install_option = '--prefix=/opt'

        content = '''
        --only-binary :all:
        INITools==2.0 --global-option="{global_option}" \
                        --install-option "{install_option}"
        '''.format(global_option=global_option, install_option=install_option)

        with requirements_file(content, tmpdir) as reqs_file:
            req = next(parse_reqfile(reqs_file.resolve(),
                                     finder=finder,
                                     options=options,
                                     session=session))

        req.source_dir = os.curdir
        with patch.object(subprocess, 'Popen') as popen:
            popen.return_value.stdout.readline.return_value = b""
            try:
                req.install([])
            except Exception:
                pass

            last_call = popen.call_args_list[-1]
            args = last_call[0][0]
            assert (
                0 < args.index(global_option) < args.index('install') <
                args.index(install_option)
            )
        assert options.format_control.no_binary == {':all:'}
        assert options.format_control.only_binary == set()
