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"""
Create a dist_info directory
As defined in the wheel specification
"""

import os
import shutil
from contextlib import contextmanager
from pathlib import Path
from typing import cast

from .. import _normalization
from .._shutil import rmdir as _rm
from .egg_info import egg_info as egg_info_cls

from distutils import log
from distutils.core import Command


class dist_info(Command):
    """
    This command is private and reserved for internal use of setuptools,
    users should rely on ``setuptools.build_meta`` APIs.
    """

    description = "DO NOT CALL DIRECTLY, INTERNAL ONLY: create .dist-info directory"

    user_options = [
        (
            'output-dir=',
            'o',
            "directory inside of which the .dist-info will be"
            "created [default: top of the source tree]",
        ),
        ('tag-date', 'd', "Add date stamp (e.g. 20050528) to version number"),
        ('tag-build=', 'b', "Specify explicit tag to add to version number"),
        ('no-date', 'D', "Don't include date stamp [default]"),
        ('keep-egg-info', None, "*TRANSITIONAL* will be removed in the future"),
    ]

    boolean_options = ['tag-date', 'keep-egg-info']
    negative_opt = {'no-date': 'tag-date'}

    def initialize_options(self):
        self.output_dir = None
        self.name = None
        self.dist_info_dir = None
        self.tag_date = None
        self.tag_build = None
        self.keep_egg_info = False

    def finalize_options(self) -> None:
        dist = self.distribution
        project_dir = dist.src_root or os.curdir
        self.output_dir = Path(self.output_dir or project_dir)

        egg_info = cast(egg_info_cls, self.reinitialize_command("egg_info"))
        egg_info.egg_base = str(self.output_dir)

        if self.tag_date:
            egg_info.tag_date = self.tag_date
        else:
            self.tag_date = egg_info.tag_date

        if self.tag_build:
            egg_info.tag_build = self.tag_build
        else:
            self.tag_build = egg_info.tag_build

        egg_info.finalize_options()
        self.egg_info = egg_info

        name = _normalization.safer_name(dist.get_name())
        version = _normalization.safer_best_effort_version(dist.get_version())
        self.name = f"{name}-{version}"
        self.dist_info_dir = os.path.join(self.output_dir, f"{self.name}.dist-info")

    @contextmanager
    def _maybe_bkp_dir(self, dir_path: str, requires_bkp: bool):
        if requires_bkp:
            bkp_name = f"{dir_path}.__bkp__"
            _rm(bkp_name, ignore_errors=True)
            shutil.copytree(dir_path, bkp_name, dirs_exist_ok=True, symlinks=True)
            try:
                yield
            finally:
                _rm(dir_path, ignore_errors=True)
                shutil.move(bkp_name, dir_path)
        else:
            yield

    def run(self) -> None:
        self.output_dir.mkdir(parents=True, exist_ok=True)
        self.egg_info.run()
        egg_info_dir = self.egg_info.egg_info
        assert os.path.isdir(egg_info_dir), ".egg-info dir should have been created"

        log.info(f"creating '{os.path.abspath(self.dist_info_dir)}'")
        bdist_wheel = self.get_finalized_command('bdist_wheel')

        # TODO: if bdist_wheel if merged into setuptools, just add "keep_egg_info" there
        with self._maybe_bkp_dir(egg_info_dir, self.keep_egg_info):
            bdist_wheel.egg2dist(egg_info_dir, self.dist_info_dir)