__all__ = ['Distribution']

import io
import sys
import re
import os
import numbers
import distutils.log
import distutils.core
import distutils.cmd
import distutils.dist
import distutils.command
from distutils.util import strtobool
from distutils.debug import DEBUG
from distutils.fancy_getopt import translate_longopt
from glob import iglob
import itertools
import textwrap
from contextlib import suppress
from typing import List, Optional, Set, TYPE_CHECKING
from pathlib import Path

from collections import defaultdict
from email import message_from_file

from distutils.errors import DistutilsOptionError, DistutilsSetupError
from distutils.util import rfc822_escape

from setuptools.extern import packaging
from setuptools.extern import ordered_set
from setuptools.extern.more_itertools import unique_everseen, partition

import setuptools
import setuptools.command
from setuptools import windows_support
from setuptools.monkey import get_unpatched
from setuptools.config import setupcfg, pyprojecttoml
from setuptools.discovery import ConfigDiscovery

from setuptools.extern.packaging import version
from . import _reqs
from . import _entry_points
from . import _normalization
from ._importlib import metadata
from .warnings import InformationOnly, SetuptoolsDeprecationWarning

if TYPE_CHECKING:
    from email.message import Message

__import__('setuptools.extern.packaging.specifiers')
__import__('setuptools.extern.packaging.version')


def get_metadata_version(self):
    mv = getattr(self, 'metadata_version', None)
    if mv is None:
        mv = version.Version('2.1')
        self.metadata_version = mv
    return mv


def rfc822_unescape(content: str) -> str:
    """Reverse RFC-822 escaping by removing leading whitespaces from content."""
    lines = content.splitlines()
    if len(lines) == 1:
        return lines[0].lstrip()
    return '\n'.join((lines[0].lstrip(), textwrap.dedent('\n'.join(lines[1:]))))


def _read_field_from_msg(msg: "Message", field: str) -> Optional[str]:
    """Read Message header field."""
    value = msg[field]
    if value == 'UNKNOWN':
        return None
    return value


def _read_field_unescaped_from_msg(msg: "Message", field: str) -> Optional[str]:
    """Read Message header field and apply rfc822_unescape."""
    value = _read_field_from_msg(msg, field)
    if value is None:
        return value
    return rfc822_unescape(value)


def _read_list_from_msg(msg: "Message", field: str) -> Optional[List[str]]:
    """Read Message header field and return all results as list."""
    values = msg.get_all(field, None)
    if values == []:
        return None
    return values


def _read_payload_from_msg(msg: "Message") -> Optional[str]:
    value = msg.get_payload().strip()
    if value == 'UNKNOWN' or not value:
        return None
    return value


def read_pkg_file(self, file):
    """Reads the metadata values from a file object."""
    msg = message_from_file(file)

    self.metadata_version = version.Version(msg['metadata-version'])
    self.name = _read_field_from_msg(msg, 'name')
    self.version = _read_field_from_msg(msg, 'version')
    self.description = _read_field_from_msg(msg, 'summary')
    # we are filling author only.
    self.author = _read_field_from_msg(msg, 'author')
    self.maintainer = None
    self.author_email = _read_field_from_msg(msg, 'author-email')
    self.maintainer_email = None
    self.url = _read_field_from_msg(msg, 'home-page')
    self.download_url = _read_field_from_msg(msg, 'download-url')
    self.license = _read_field_unescaped_from_msg(msg, 'license')

    self.long_description = _read_field_unescaped_from_msg(msg, 'description')
    if self.long_description is None and self.metadata_version >= version.Version(
        '2.1'
    ):
        self.long_description = _read_payload_from_msg(msg)
    self.description = _read_field_from_msg(msg, 'summary')

    if 'keywords' in msg:
        self.keywords = _read_field_from_msg(msg, 'keywords').split(',')

    self.platforms = _read_list_from_msg(msg, 'platform')
    self.classifiers = _read_list_from_msg(msg, 'classifier')

    # PEP 314 - these fields only exist in 1.1
    if self.metadata_version == version.Version('1.1'):
        self.requires = _read_list_from_msg(msg, 'requires')
        self.provides = _read_list_from_msg(msg, 'provides')
        self.obsoletes = _read_list_from_msg(msg, 'obsoletes')
    else:
        self.requires = None
        self.provides = None
        self.obsoletes = None

    self.license_files = _read_list_from_msg(msg, 'license-file')


def single_line(val):
    """
    Quick and dirty validation for Summary pypa/setuptools#1390.
    """
    if '\n' in val:
        # TODO: Replace with `raise ValueError("newlines not allowed")`
        # after reviewing #2893.
        msg = "newlines are not allowed in `summary` and will break in the future"
        SetuptoolsDeprecationWarning.emit("Invalid config.", msg)
        # due_date is undefined. Controversial change, there was a lot of push back.
        val = val.strip().split('\n')[0]
    return val


# Based on Python 3.5 version
def write_pkg_file(self, file):  # noqa: C901  # is too complex (14)  # FIXME
    """Write the PKG-INFO format data to a file object."""
    version = self.get_metadata_version()

    def write_field(key, value):
        file.write("%s: %s\n" % (key, value))

    write_field('Metadata-Version', str(version))
    write_field('Name', self.get_name())
    write_field('Version', self.get_version())

    summary = self.get_description()
    if summary:
        write_field('Summary', single_line(summary))

    optional_fields = (
        ('Home-page', 'url'),
        ('Download-URL', 'download_url'),
        ('Author', 'author'),
        ('Author-email', 'author_email'),
        ('Maintainer', 'maintainer'),
        ('Maintainer-email', 'maintainer_email'),
    )

    for field, attr in optional_fields:
        attr_val = getattr(self, attr, None)
        if attr_val is not None:
            write_field(field, attr_val)

    license = self.get_license()
    if license:
        write_field('License', rfc822_escape(license))

    for project_url in self.project_urls.items():
        write_field('Project-URL', '%s, %s' % project_url)

    keywords = ','.join(self.get_keywords())
    if keywords:
        write_field('Keywords', keywords)

    platforms = self.get_platforms() or []
    for platform in platforms:
        write_field('Platform', platform)

    self._write_list(file, 'Classifier', self.get_classifiers())

    # PEP 314
    self._write_list(file, 'Requires', self.get_requires())
    self._write_list(file, 'Provides', self.get_provides())
    self._write_list(file, 'Obsoletes', self.get_obsoletes())

    # Setuptools specific for PEP 345
    if hasattr(self, 'python_requires'):
        write_field('Requires-Python', self.python_requires)

    # PEP 566
    if self.long_description_content_type:
        write_field('Description-Content-Type', self.long_description_content_type)
    if self.provides_extras:
        for extra in self.provides_extras:
            write_field('Provides-Extra', extra)

    self._write_list(file, 'License-File', self.license_files or [])

    long_description = self.get_long_description()
    if long_description:
        file.write("\n%s" % long_description)
        if not long_description.endswith("\n"):
            file.write("\n")


sequence = tuple, list


def check_importable(dist, attr, value):
    try:
        ep = metadata.EntryPoint(value=value, name=None, group=None)
        assert not ep.extras
    except (TypeError, ValueError, AttributeError, AssertionError) as e:
        raise DistutilsSetupError(
            "%r must be importable 'module:attrs' string (got %r)" % (attr, value)
        ) from e


def assert_string_list(dist, attr, value):
    """Verify that value is a string list"""
    try:
        # verify that value is a list or tuple to exclude unordered
        # or single-use iterables
        assert isinstance(value, (list, tuple))
        # verify that elements of value are strings
        assert ''.join(value) != value
    except (TypeError, ValueError, AttributeError, AssertionError) as e:
        raise DistutilsSetupError(
            "%r must be a list of strings (got %r)" % (attr, value)
        ) from e


def check_nsp(dist, attr, value):
    """Verify that namespace packages are valid"""
    ns_packages = value
    assert_string_list(dist, attr, ns_packages)
    for nsp in ns_packages:
        if not dist.has_contents_for(nsp):
            raise DistutilsSetupError(
                "Distribution contains no modules or packages for "
                + "namespace package %r" % nsp
            )
        parent, sep, child = nsp.rpartition('.')
        if parent and parent not in ns_packages:
            distutils.log.warn(
                "WARNING: %r is declared as a package namespace, but %r"
                " is not: please correct this in setup.py",
                nsp,
                parent,
            )
        SetuptoolsDeprecationWarning.emit(
            "The namespace_packages parameter is deprecated.",
            "Please replace its usage with implicit namespaces (PEP 420).",
            see_docs="references/keywords.html#keyword-namespace-packages"
            # TODO: define due_date, it may break old packages that are no longer
            # maintained (e.g. sphinxcontrib extensions) when installed from source.
            # Warning officially introduced in May 2022, however the deprecation
            # was mentioned much earlier in the docs (May 2020, see #2149).
        )


def check_extras(dist, attr, value):
    """Verify that extras_require mapping is valid"""
    try:
        list(itertools.starmap(_check_extra, value.items()))
    except (TypeError, ValueError, AttributeError) as e:
        raise DistutilsSetupError(
            "'extras_require' must be a dictionary whose values are "
            "strings or lists of strings containing valid project/version "
            "requirement specifiers."
        ) from e


def _check_extra(extra, reqs):
    name, sep, marker = extra.partition(':')
    try:
        _check_marker(marker)
    except packaging.markers.InvalidMarker:
        msg = f"Invalid environment marker: {marker} ({extra!r})"
        raise DistutilsSetupError(msg) from None
    list(_reqs.parse(reqs))


def _check_marker(marker):
    if not marker:
        return
    m = packaging.markers.Marker(marker)
    m.evaluate()


def assert_bool(dist, attr, value):
    """Verify that value is True, False, 0, or 1"""
    if bool(value) != value:
        tmpl = "{attr!r} must be a boolean value (got {value!r})"
        raise DistutilsSetupError(tmpl.format(attr=attr, value=value))


def invalid_unless_false(dist, attr, value):
    if not value:
        DistDeprecationWarning.emit(f"{attr} is ignored.")
        # TODO: should there be a `due_date` here?
        return
    raise DistutilsSetupError(f"{attr} is invalid.")


def check_requirements(dist, attr, value):
    """Verify that install_requires is a valid requirements list"""
    try:
        list(_reqs.parse(value))
        if isinstance(value, (dict, set)):
            raise TypeError("Unordered types are not allowed")
    except (TypeError, ValueError) as error:
        tmpl = (
            "{attr!r} must be a string or list of strings "
            "containing valid project/version requirement specifiers; {error}"
        )
        raise DistutilsSetupError(tmpl.format(attr=attr, error=error)) from error


def check_specifier(dist, attr, value):
    """Verify that value is a valid version specifier"""
    try:
        packaging.specifiers.SpecifierSet(value)
    except (packaging.specifiers.InvalidSpecifier, AttributeError) as error:
        tmpl = (
            "{attr!r} must be a string " "containing valid version specifiers; {error}"
        )
        raise DistutilsSetupError(tmpl.format(attr=attr, error=error)) from error


def check_entry_points(dist, attr, value):
    """Verify that entry_points map is parseable"""
    try:
        _entry_points.load(value)
    except Exception as e:
        raise DistutilsSetupError(e) from e


def check_test_suite(dist, attr, value):
    if not isinstance(value, str):
        raise DistutilsSetupError("test_suite must be a string")


def check_package_data(dist, attr, value):
    """Verify that value is a dictionary of package names to glob lists"""
    if not isinstance(value, dict):
        raise DistutilsSetupError(
            "{!r} must be a dictionary mapping package names to lists of "
            "string wildcard patterns".format(attr)
        )
    for k, v in value.items():
        if not isinstance(k, str):
            raise DistutilsSetupError(
                "keys of {!r} dict must be strings (got {!r})".format(attr, k)
            )
        assert_string_list(dist, 'values of {!r} dict'.format(attr), v)


def check_packages(dist, attr, value):
    for pkgname in value:
        if not re.match(r'\w+(\.\w+)*', pkgname):
            distutils.log.warn(
                "WARNING: %r not a valid package name; please use only "
                ".-separated package names in setup.py",
                pkgname,
            )


_Distribution = get_unpatched(distutils.core.Distribution)


class Distribution(_Distribution):
    """Distribution with support for tests and package data

    This is an enhanced version of 'distutils.dist.Distribution' that
    effectively adds the following new optional keyword arguments to 'setup()':

     'install_requires' -- a string or sequence of strings specifying project
        versions that the distribution requires when installed, in the format
        used by 'pkg_resources.require()'.  They will be installed
        automatically when the package is installed.  If you wish to use
        packages that are not available in PyPI, or want to give your users an
        alternate download location, you can add a 'find_links' option to the
        '[easy_install]' section of your project's 'setup.cfg' file, and then
        setuptools will scan the listed web pages for links that satisfy the
        requirements.

     'extras_require' -- a dictionary mapping names of optional "extras" to the
        additional requirement(s) that using those extras incurs. For example,
        this::

            extras_require = dict(reST = ["docutils>=0.3", "reSTedit"])

        indicates that the distribution can optionally provide an extra
        capability called "reST", but it can only be used if docutils and
        reSTedit are installed.  If the user installs your package using
        EasyInstall and requests one of your extras, the corresponding
        additional requirements will be installed if needed.

     'test_suite' -- the name of a test suite to run for the 'test' command.
        If the user runs 'python setup.py test', the package will be installed,
        and the named test suite will be run.  The format is the same as
        would be used on a 'unittest.py' command line.  That is, it is the
        dotted name of an object to import and call to generate a test suite.

     'package_data' -- a dictionary mapping package names to lists of filenames
        or globs to use to find data files contained in the named packages.
        If the dictionary has filenames or globs listed under '""' (the empty
        string), those names will be searched for in every package, in addition
        to any names for the specific package.  Data files found using these
        names/globs will be installed along with the package, in the same
        location as the package.  Note that globs are allowed to reference
        the contents of non-package subdirectories, as long as you use '/' as
        a path separator.  (Globs are automatically converted to
        platform-specific paths at runtime.)

    In addition to these new keywords, this class also has several new methods
    for manipulating the distribution's contents.  For example, the 'include()'
    and 'exclude()' methods can be thought of as in-place add and subtract
    commands that add or remove packages, modules, extensions, and so on from
    the distribution.
    """

    _DISTUTILS_UNSUPPORTED_METADATA = {
        'long_description_content_type': lambda: None,
        'project_urls': dict,
        'provides_extras': ordered_set.OrderedSet,
        'license_file': lambda: None,
        'license_files': lambda: None,
    }

    _patched_dist = None

    def patch_missing_pkg_info(self, attrs):
        # Fake up a replacement for the data that would normally come from
        # PKG-INFO, but which might not yet be built if this is a fresh
        # checkout.
        #
        if not attrs or 'name' not in attrs or 'version' not in attrs:
            return
        name = _normalization.safe_name(str(attrs['name'])).lower()
        with suppress(metadata.PackageNotFoundError):
            dist = metadata.distribution(name)
            if dist is not None and not dist.read_text('PKG-INFO'):
                dist._version = _normalization.safe_version(str(attrs['version']))
                self._patched_dist = dist

    def __init__(self, attrs=None):
        have_package_data = hasattr(self, "package_data")
        if not have_package_data:
            self.package_data = {}
        attrs = attrs or {}
        self.dist_files = []
        # Filter-out setuptools' specific options.
        self.src_root = attrs.pop("src_root", None)
        self.patch_missing_pkg_info(attrs)
        self.dependency_links = attrs.pop('dependency_links', [])
        self.setup_requires = attrs.pop('setup_requires', [])
        for ep in metadata.entry_points(group='distutils.setup_keywords'):
            vars(self).setdefault(ep.name, None)
        _Distribution.__init__(
            self,
            {
                k: v
                for k, v in attrs.items()
                if k not in self._DISTUTILS_UNSUPPORTED_METADATA
            },
        )

        # Private API (setuptools-use only, not restricted to Distribution)
        # Stores files that are referenced by the configuration and need to be in the
        # sdist (e.g. `version = file: VERSION.txt`)
        self._referenced_files: Set[str] = set()

        # Save the original dependencies before they are processed into the egg format
        self._orig_extras_require = {}
        self._orig_install_requires = []
        self._tmp_extras_require = defaultdict(ordered_set.OrderedSet)

        self.set_defaults = ConfigDiscovery(self)

        self._set_metadata_defaults(attrs)

        self.metadata.version = self._normalize_version(
            self._validate_version(self.metadata.version)
        )
        self._finalize_requires()

    def _validate_metadata(self):
        required = {"name"}
        provided = {
            key
            for key in vars(self.metadata)
            if getattr(self.metadata, key, None) is not None
        }
        missing = required - provided

        if missing:
            msg = f"Required package metadata is missing: {missing}"
            raise DistutilsSetupError(msg)

    def _set_metadata_defaults(self, attrs):
        """
        Fill-in missing metadata fields not supported by distutils.
        Some fields may have been set by other tools (e.g. pbr).
        Those fields (vars(self.metadata)) take precedence to
        supplied attrs.
        """
        for option, default in self._DISTUTILS_UNSUPPORTED_METADATA.items():
            vars(self.metadata).setdefault(option, attrs.get(option, default()))

    @staticmethod
    def _normalize_version(version):
        if isinstance(version, setuptools.sic) or version is None:
            return version

        normalized = str(packaging.version.Version(version))
        if version != normalized:
            InformationOnly.emit(f"Normalizing '{version}' to '{normalized}'")
            return normalized
        return version

    @staticmethod
    def _validate_version(version):
        if isinstance(version, numbers.Number):
            # Some people apparently take "version number" too literally :)
            version = str(version)

        if version is not None:
            try:
                packaging.version.Version(version)
            except (packaging.version.InvalidVersion, TypeError):
                SetuptoolsDeprecationWarning.emit(
                    f"Invalid version: {version!r}.",
                    """
                    The version specified is not a valid version according to PEP 440.
                    This may not work as expected with newer versions of
                    setuptools, pip, and PyPI.
                    """,
                    see_url="https://peps.python.org/pep-0440/",
                    due_date=(2023, 9, 26),
                    # Warning initially introduced in 26 Sept 2014
                    # pypa/packaging already removed legacy versions.
                )
                return setuptools.sic(version)
        return version

    def _finalize_requires(self):
        """
        Set `metadata.python_requires` and fix environment markers
        in `install_requires` and `extras_require`.
        """
        if getattr(self, 'python_requires', None):
            self.metadata.python_requires = self.python_requires

        if getattr(self, 'extras_require', None):
            # Save original before it is messed by _convert_extras_requirements
            self._orig_extras_require = self._orig_extras_require or self.extras_require
            for extra in self.extras_require.keys():
                # Since this gets called multiple times at points where the
                # keys have become 'converted' extras, ensure that we are only
                # truly adding extras we haven't seen before here.
                extra = extra.split(':')[0]
                if extra:
                    self.metadata.provides_extras.add(extra)

        if getattr(self, 'install_requires', None) and not self._orig_install_requires:
            # Save original before it is messed by _move_install_requirements_markers
            self._orig_install_requires = self.install_requires

        self._convert_extras_requirements()
        self._move_install_requirements_markers()

    def _convert_extras_requirements(self):
        """
        Convert requirements in `extras_require` of the form
        `"extra": ["barbazquux; {marker}"]` to
        `"extra:{marker}": ["barbazquux"]`.
        """
        spec_ext_reqs = getattr(self, 'extras_require', None) or {}
        tmp = defaultdict(ordered_set.OrderedSet)
        self._tmp_extras_require = getattr(self, '_tmp_extras_require', tmp)
        for section, v in spec_ext_reqs.items():
            # Do not strip empty sections.
            self._tmp_extras_require[section]
            for r in _reqs.parse(v):
                suffix = self._suffix_for(r)
                self._tmp_extras_require[section + suffix].append(r)

    @staticmethod
    def _suffix_for(req):
        """
        For a requirement, return the 'extras_require' suffix for
        that requirement.
        """
        return ':' + str(req.marker) if req.marker else ''

    def _move_install_requirements_markers(self):
        """
        Move requirements in `install_requires` that are using environment
        markers `extras_require`.
        """

        # divide the install_requires into two sets, simple ones still
        # handled by install_requires and more complex ones handled
        # by extras_require.

        def is_simple_req(req):
            return not req.marker

        spec_inst_reqs = getattr(self, 'install_requires', None) or ()
        inst_reqs = list(_reqs.parse(spec_inst_reqs))
        simple_reqs = filter(is_simple_req, inst_reqs)
        complex_reqs = itertools.filterfalse(is_simple_req, inst_reqs)
        self.install_requires = list(map(str, simple_reqs))

        for r in complex_reqs:
            self._tmp_extras_require[':' + str(r.marker)].append(r)
        self.extras_require = dict(
            # list(dict.fromkeys(...))  ensures a list of unique strings
            (k, list(dict.fromkeys(str(r) for r in map(self._clean_req, v))))
            for k, v in self._tmp_extras_require.items()
        )

    def _clean_req(self, req):
        """
        Given a Requirement, remove environment markers and return it.
        """
        req.marker = None
        return req

    def _finalize_license_files(self):
        """Compute names of all license files which should be included."""
        license_files: Optional[List[str]] = self.metadata.license_files
        patterns: List[str] = license_files if license_files else []

        license_file: Optional[str] = self.metadata.license_file
        if license_file and license_file not in patterns:
            patterns.append(license_file)

        if license_files is None and license_file is None:
            # Default patterns match the ones wheel uses
            # See https://wheel.readthedocs.io/en/stable/user_guide.html
            # -> 'Including license files in the generated wheel file'
            patterns = ('LICEN[CS]E*', 'COPYING*', 'NOTICE*', 'AUTHORS*')

        self.metadata.license_files = list(
            unique_everseen(self._expand_patterns(patterns))
        )

    @staticmethod
    def _expand_patterns(patterns):
        """
        >>> list(Distribution._expand_patterns(['LICENSE']))
        ['LICENSE']
        >>> list(Distribution._expand_patterns(['setup.cfg', 'LIC*']))
        ['setup.cfg', 'LICENSE']
        """
        return (
            path
            for pattern in patterns
            for path in sorted(iglob(pattern))
            if not path.endswith('~') and os.path.isfile(path)
        )

    # FIXME: 'Distribution._parse_config_files' is too complex (14)
    def _parse_config_files(self, filenames=None):  # noqa: C901
        """
        Adapted from distutils.dist.Distribution.parse_config_files,
        this method provides the same functionality in subtly-improved
        ways.
        """
        from configparser import ConfigParser

        # Ignore install directory options if we have a venv
        ignore_options = (
            []
            if sys.prefix == sys.base_prefix
            else [
                'install-base',
                'install-platbase',
                'install-lib',
                'install-platlib',
                'install-purelib',
                'install-headers',
                'install-scripts',
                'install-data',
                'prefix',
                'exec-prefix',
                'home',
                'user',
                'root',
            ]
        )

        ignore_options = frozenset(ignore_options)

        if filenames is None:
            filenames = self.find_config_files()

        if DEBUG:
            self.announce("Distribution.parse_config_files():")

        parser = ConfigParser()
        parser.optionxform = str
        for filename in filenames:
            with io.open(filename, encoding='utf-8') as reader:
                if DEBUG:
                    self.announce("  reading {filename}".format(**locals()))
                parser.read_file(reader)
            for section in parser.sections():
                options = parser.options(section)
                opt_dict = self.get_option_dict(section)

                for opt in options:
                    if opt == '__name__' or opt in ignore_options:
                        continue

                    val = parser.get(section, opt)
                    opt = self.warn_dash_deprecation(opt, section)
                    opt = self.make_option_lowercase(opt, section)
                    opt_dict[opt] = (filename, val)

            # Make the ConfigParser forget everything (so we retain
            # the original filenames that options come from)
            parser.__init__()

        if 'global' not in self.command_options:
            return

        # If there was a "global" section in the config file, use it
        # to set Distribution options.

        for opt, (src, val) in self.command_options['global'].items():
            alias = self.negative_opt.get(opt)
            if alias:
                val = not strtobool(val)
            elif opt in ('verbose', 'dry_run'):  # ugh!
                val = strtobool(val)

            try:
                setattr(self, alias or opt, val)
            except ValueError as e:
                raise DistutilsOptionError(e) from e

    def warn_dash_deprecation(self, opt, section):
        if section in (
            'options.extras_require',
            'options.data_files',
        ):
            return opt

        underscore_opt = opt.replace('-', '_')
        commands = list(
            itertools.chain(
                distutils.command.__all__,
                self._setuptools_commands(),
            )
        )
        if (
            not section.startswith('options')
            and section != 'metadata'
            and section not in commands
        ):
            return underscore_opt

        if '-' in opt:
            SetuptoolsDeprecationWarning.emit(
                "Invalid dash-separated options",
                f"""
                Usage of dash-separated {opt!r} will not be supported in future
                versions. Please use the underscore name {underscore_opt!r} instead.
                """,
                see_docs="userguide/declarative_config.html",
                due_date=(2023, 9, 26),
                # Warning initially introduced in 3 Mar 2021
            )
        return underscore_opt

    def _setuptools_commands(self):
        try:
            return metadata.distribution('setuptools').entry_points.names
        except metadata.PackageNotFoundError:
            # during bootstrapping, distribution doesn't exist
            return []

    def make_option_lowercase(self, opt, section):
        if section != 'metadata' or opt.islower():
            return opt

        lowercase_opt = opt.lower()
        SetuptoolsDeprecationWarning.emit(
            "Invalid uppercase configuration",
            f"""
            Usage of uppercase key {opt!r} in {section!r} will not be supported in
            future versions. Please use lowercase {lowercase_opt!r} instead.
            """,
            see_docs="userguide/declarative_config.html",
            due_date=(2023, 9, 26),
            # Warning initially introduced in 6 Mar 2021
        )
        return lowercase_opt

    # FIXME: 'Distribution._set_command_options' is too complex (14)
    def _set_command_options(self, command_obj, option_dict=None):  # noqa: C901
        """
        Set the options for 'command_obj' from 'option_dict'.  Basically
        this means copying elements of a dictionary ('option_dict') to
        attributes of an instance ('command').

        'command_obj' must be a Command instance.  If 'option_dict' is not
        supplied, uses the standard option dictionary for this command
        (from 'self.command_options').

        (Adopted from distutils.dist.Distribution._set_command_options)
        """
        command_name = command_obj.get_command_name()
        if option_dict is None:
            option_dict = self.get_option_dict(command_name)

        if DEBUG:
            self.announce("  setting options for '%s' command:" % command_name)
        for option, (source, value) in option_dict.items():
            if DEBUG:
                self.announce("    %s = %s (from %s)" % (option, value, source))
            try:
                bool_opts = [translate_longopt(o) for o in command_obj.boolean_options]
            except AttributeError:
                bool_opts = []
            try:
                neg_opt = command_obj.negative_opt
            except AttributeError:
                neg_opt = {}

            try:
                is_string = isinstance(value, str)
                if option in neg_opt and is_string:
                    setattr(command_obj, neg_opt[option], not strtobool(value))
                elif option in bool_opts and is_string:
                    setattr(command_obj, option, strtobool(value))
                elif hasattr(command_obj, option):
                    setattr(command_obj, option, value)
                else:
                    raise DistutilsOptionError(
                        "error in %s: command '%s' has no such option '%s'"
                        % (source, command_name, option)
                    )
            except ValueError as e:
                raise DistutilsOptionError(e) from e

    def _get_project_config_files(self, filenames):
        """Add default file and split between INI and TOML"""
        tomlfiles = []
        standard_project_metadata = Path(self.src_root or os.curdir, "pyproject.toml")
        if filenames is not None:
            parts = partition(lambda f: Path(f).suffix == ".toml", filenames)
            filenames = list(parts[0])  # 1st element => predicate is False
            tomlfiles = list(parts[1])  # 2nd element => predicate is True
        elif standard_project_metadata.exists():
            tomlfiles = [standard_project_metadata]
        return filenames, tomlfiles

    def parse_config_files(self, filenames=None, ignore_option_errors=False):
        """Parses configuration files from various levels
        and loads configuration.
        """
        inifiles, tomlfiles = self._get_project_config_files(filenames)

        self._parse_config_files(filenames=inifiles)

        setupcfg.parse_configuration(
            self, self.command_options, ignore_option_errors=ignore_option_errors
        )
        for filename in tomlfiles:
            pyprojecttoml.apply_configuration(self, filename, ignore_option_errors)

        self._finalize_requires()
        self._finalize_license_files()

    def fetch_build_eggs(self, requires):
        """Resolve pre-setup requirements"""
        from setuptools.installer import _fetch_build_eggs

        return _fetch_build_eggs(self, requires)

    def finalize_options(self):
        """
        Allow plugins to apply arbitrary operations to the
        distribution. Each hook may optionally define a 'order'
        to influence the order of execution. Smaller numbers
        go first and the default is 0.
        """
        group = 'setuptools.finalize_distribution_options'

        def by_order(hook):
            return getattr(hook, 'order', 0)

        defined = metadata.entry_points(group=group)
        filtered = itertools.filterfalse(self._removed, defined)
        loaded = map(lambda e: e.load(), filtered)
        for ep in sorted(loaded, key=by_order):
            ep(self)

    @staticmethod
    def _removed(ep):
        """
        When removing an entry point, if metadata is loaded
        from an older version of Setuptools, that removed
        entry point will attempt to be loaded and will fail.
        See #2765 for more details.
        """
        removed = {
            # removed 2021-09-05
            '2to3_doctests',
        }
        return ep.name in removed

    def _finalize_setup_keywords(self):
        for ep in metadata.entry_points(group='distutils.setup_keywords'):
            value = getattr(self, ep.name, None)
            if value is not None:
                ep.load()(self, ep.name, value)

    def get_egg_cache_dir(self):
        egg_cache_dir = os.path.join(os.curdir, '.eggs')
        if not os.path.exists(egg_cache_dir):
            os.mkdir(egg_cache_dir)
            windows_support.hide_file(egg_cache_dir)
            readme_txt_filename = os.path.join(egg_cache_dir, 'README.txt')
            with open(readme_txt_filename, 'w') as f:
                f.write(
                    'This directory contains eggs that were downloaded '
                    'by setuptools to build, test, and run plug-ins.\n\n'
                )
                f.write(
                    'This directory caches those eggs to prevent '
                    'repeated downloads.\n\n'
                )
                f.write('However, it is safe to delete this directory.\n\n')

        return egg_cache_dir

    def fetch_build_egg(self, req):
        """Fetch an egg needed for building"""
        from setuptools.installer import fetch_build_egg

        return fetch_build_egg(self, req)

    def get_command_class(self, command):
        """Pluggable version of get_command_class()"""
        if command in self.cmdclass:
            return self.cmdclass[command]

        eps = metadata.entry_points(group='distutils.commands', name=command)
        for ep in eps:
            self.cmdclass[command] = cmdclass = ep.load()
            return cmdclass
        else:
            return _Distribution.get_command_class(self, command)

    def print_commands(self):
        for ep in metadata.entry_points(group='distutils.commands'):
            if ep.name not in self.cmdclass:
                cmdclass = ep.load()
                self.cmdclass[ep.name] = cmdclass
        return _Distribution.print_commands(self)

    def get_command_list(self):
        for ep in metadata.entry_points(group='distutils.commands'):
            if ep.name not in self.cmdclass:
                cmdclass = ep.load()
                self.cmdclass[ep.name] = cmdclass
        return _Distribution.get_command_list(self)

    def include(self, **attrs):
        """Add items to distribution that are named in keyword arguments

        For example, 'dist.include(py_modules=["x"])' would add 'x' to
        the distribution's 'py_modules' attribute, if it was not already
        there.

        Currently, this method only supports inclusion for attributes that are
        lists or tuples.  If you need to add support for adding to other
        attributes in this or a subclass, you can add an '_include_X' method,
        where 'X' is the name of the attribute.  The method will be called with
        the value passed to 'include()'.  So, 'dist.include(foo={"bar":"baz"})'
        will try to call 'dist._include_foo({"bar":"baz"})', which can then
        handle whatever special inclusion logic is needed.
        """
        for k, v in attrs.items():
            include = getattr(self, '_include_' + k, None)
            if include:
                include(v)
            else:
                self._include_misc(k, v)

    def exclude_package(self, package):
        """Remove packages, modules, and extensions in named package"""

        pfx = package + '.'
        if self.packages:
            self.packages = [
                p for p in self.packages if p != package and not p.startswith(pfx)
            ]

        if self.py_modules:
            self.py_modules = [
                p for p in self.py_modules if p != package and not p.startswith(pfx)
            ]

        if self.ext_modules:
            self.ext_modules = [
                p
                for p in self.ext_modules
                if p.name != package and not p.name.startswith(pfx)
            ]

    def has_contents_for(self, package):
        """Return true if 'exclude_package(package)' would do something"""

        pfx = package + '.'

        for p in self.iter_distribution_names():
            if p == package or p.startswith(pfx):
                return True

    def _exclude_misc(self, name, value):
        """Handle 'exclude()' for list/tuple attrs without a special handler"""
        if not isinstance(value, sequence):
            raise DistutilsSetupError(
                "%s: setting must be a list or tuple (%r)" % (name, value)
            )
        try:
            old = getattr(self, name)
        except AttributeError as e:
            raise DistutilsSetupError("%s: No such distribution setting" % name) from e
        if old is not None and not isinstance(old, sequence):
            raise DistutilsSetupError(
                name + ": this setting cannot be changed via include/exclude"
            )
        elif old:
            setattr(self, name, [item for item in old if item not in value])

    def _include_misc(self, name, value):
        """Handle 'include()' for list/tuple attrs without a special handler"""

        if not isinstance(value, sequence):
            raise DistutilsSetupError("%s: setting must be a list (%r)" % (name, value))
        try:
            old = getattr(self, name)
        except AttributeError as e:
            raise DistutilsSetupError("%s: No such distribution setting" % name) from e
        if old is None:
            setattr(self, name, value)
        elif not isinstance(old, sequence):
            raise DistutilsSetupError(
                name + ": this setting cannot be changed via include/exclude"
            )
        else:
            new = [item for item in value if item not in old]
            setattr(self, name, old + new)

    def exclude(self, **attrs):
        """Remove items from distribution that are named in keyword arguments

        For example, 'dist.exclude(py_modules=["x"])' would remove 'x' from
        the distribution's 'py_modules' attribute.  Excluding packages uses
        the 'exclude_package()' method, so all of the package's contained
        packages, modules, and extensions are also excluded.

        Currently, this method only supports exclusion from attributes that are
        lists or tuples.  If you need to add support for excluding from other
        attributes in this or a subclass, you can add an '_exclude_X' method,
        where 'X' is the name of the attribute.  The method will be called with
        the value passed to 'exclude()'.  So, 'dist.exclude(foo={"bar":"baz"})'
        will try to call 'dist._exclude_foo({"bar":"baz"})', which can then
        handle whatever special exclusion logic is needed.
        """
        for k, v in attrs.items():
            exclude = getattr(self, '_exclude_' + k, None)
            if exclude:
                exclude(v)
            else:
                self._exclude_misc(k, v)

    def _exclude_packages(self, packages):
        if not isinstance(packages, sequence):
            raise DistutilsSetupError(
                "packages: setting must be a list or tuple (%r)" % (packages,)
            )
        list(map(self.exclude_package, packages))

    def _parse_command_opts(self, parser, args):
        # Remove --with-X/--without-X options when processing command args
        self.global_options = self.__class__.global_options
        self.negative_opt = self.__class__.negative_opt

        # First, expand any aliases
        command = args[0]
        aliases = self.get_option_dict('aliases')
        while command in aliases:
            src, alias = aliases[command]
            del aliases[command]  # ensure each alias can expand only once!
            import shlex

            args[:1] = shlex.split(alias, True)
            command = args[0]

        nargs = _Distribution._parse_command_opts(self, parser, args)

        # Handle commands that want to consume all remaining arguments
        cmd_class = self.get_command_class(command)
        if getattr(cmd_class, 'command_consumes_arguments', None):
            self.get_option_dict(command)['args'] = ("command line", nargs)
            if nargs is not None:
                return []

        return nargs

    def get_cmdline_options(self):
        """Return a '{cmd: {opt:val}}' map of all command-line options

        Option names are all long, but do not include the leading '--', and
        contain dashes rather than underscores.  If the option doesn't take
        an argument (e.g. '--quiet'), the 'val' is 'None'.

        Note that options provided by config files are intentionally excluded.
        """

        d = {}

        for cmd, opts in self.command_options.items():
            for opt, (src, val) in opts.items():
                if src != "command line":
                    continue

                opt = opt.replace('_', '-')

                if val == 0:
                    cmdobj = self.get_command_obj(cmd)
                    neg_opt = self.negative_opt.copy()
                    neg_opt.update(getattr(cmdobj, 'negative_opt', {}))
                    for neg, pos in neg_opt.items():
                        if pos == opt:
                            opt = neg
                            val = None
                            break
                    else:
                        raise AssertionError("Shouldn't be able to get here")

                elif val == 1:
                    val = None

                d.setdefault(cmd, {})[opt] = val

        return d

    def iter_distribution_names(self):
        """Yield all packages, modules, and extension names in distribution"""

        for pkg in self.packages or ():
            yield pkg

        for module in self.py_modules or ():
            yield module

        for ext in self.ext_modules or ():
            if isinstance(ext, tuple):
                name, buildinfo = ext
            else:
                name = ext.name
            if name.endswith('module'):
                name = name[:-6]
            yield name

    def handle_display_options(self, option_order):
        """If there were any non-global "display-only" options
        (--help-commands or the metadata display options) on the command
        line, display the requested info and return true; else return
        false.
        """
        import sys

        if self.help_commands:
            return _Distribution.handle_display_options(self, option_order)

        # Stdout may be StringIO (e.g. in tests)
        if not isinstance(sys.stdout, io.TextIOWrapper):
            return _Distribution.handle_display_options(self, option_order)

        # Don't wrap stdout if utf-8 is already the encoding. Provides
        #  workaround for #334.
        if sys.stdout.encoding.lower() in ('utf-8', 'utf8'):
            return _Distribution.handle_display_options(self, option_order)

        # Print metadata in UTF-8 no matter the platform
        encoding = sys.stdout.encoding
        sys.stdout.reconfigure(encoding='utf-8')
        try:
            return _Distribution.handle_display_options(self, option_order)
        finally:
            sys.stdout.reconfigure(encoding=encoding)

    def run_command(self, command):
        self.set_defaults()
        # Postpone defaults until all explicit configuration is considered
        # (setup() args, config files, command line and plugins)

        super().run_command(command)


class DistDeprecationWarning(SetuptoolsDeprecationWarning):
    """Class for warning about deprecations in dist in
    setuptools. Not ignored by default, unlike DeprecationWarning."""
