import logging
from optparse import Values
from typing import List

from pip._vendor.packaging.utils import canonicalize_name

from pip._internal.cli import cmdoptions
from pip._internal.cli.base_command import Command
from pip._internal.cli.index_command import SessionCommandMixin
from pip._internal.cli.status_codes import SUCCESS
from pip._internal.exceptions import InstallationError
from pip._internal.req import parse_requirements
from pip._internal.req.constructors import (
    install_req_from_line,
    install_req_from_parsed_requirement,
)
from pip._internal.utils.misc import (
    check_externally_managed,
    protect_pip_from_modification_on_windows,
    warn_if_run_as_root,
)

logger = logging.getLogger(__name__)


class UninstallCommand(Command, SessionCommandMixin):
    """
    Uninstall packages.

    pip is able to uninstall most installed packages. Known exceptions are:

    - Pure distutils packages installed with ``python setup.py install``, which
      leave behind no metadata to determine what files were installed.
    - Script wrappers installed by ``python setup.py develop``.
    """

    usage = """
      %prog [options] <package> ...
      %prog [options] -r <requirements file> ..."""

    def add_options(self) -> None:
        self.cmd_opts.add_option(
            "-r",
            "--requirement",
            dest="requirements",
            action="append",
            default=[],
            metavar="file",
            help=(
                "Uninstall all the packages listed in the given requirements "
                "file.  This option can be used multiple times."
            ),
        )
        self.cmd_opts.add_option(
            "-y",
            "--yes",
            dest="yes",
            action="store_true",
            help="Don't ask for confirmation of uninstall deletions.",
        )
        self.cmd_opts.add_option(cmdoptions.root_user_action())
        self.cmd_opts.add_option(cmdoptions.override_externally_managed())
        self.parser.insert_option_group(0, self.cmd_opts)

    def run(self, options: Values, args: List[str]) -> int:
        session = self.get_default_session(options)

        reqs_to_uninstall = {}
        for name in args:
            req = install_req_from_line(
                name,
                isolated=options.isolated_mode,
            )
            if req.name:
                reqs_to_uninstall[canonicalize_name(req.name)] = req
            else:
                logger.warning(
                    "Invalid requirement: %r ignored -"
                    " the uninstall command expects named"
                    " requirements.",
                    name,
                )
        for filename in options.requirements:
            for parsed_req in parse_requirements(
                filename, options=options, session=session
            ):
                req = install_req_from_parsed_requirement(
                    parsed_req, isolated=options.isolated_mode
                )
                if req.name:
                    reqs_to_uninstall[canonicalize_name(req.name)] = req
        if not reqs_to_uninstall:
            raise InstallationError(
                f"You must give at least one requirement to {self.name} (see "
                f'"pip help {self.name}")'
            )

        if not options.override_externally_managed:
            check_externally_managed()

        protect_pip_from_modification_on_windows(
            modifying_pip="pip" in reqs_to_uninstall
        )

        for req in reqs_to_uninstall.values():
            uninstall_pathset = req.uninstall(
                auto_confirm=options.yes,
                verbose=self.verbosity > 0,
            )
            if uninstall_pathset:
                uninstall_pathset.commit()
        if options.root_user_action == "warn":
            warn_if_run_as_root()
        return SUCCESS

"""
Package containing all pip commands
"""

import importlib
from collections import namedtuple
from typing import Any, Dict, Optional

from pip._internal.cli.base_command import Command

CommandInfo = namedtuple("CommandInfo", "module_path, class_name, summary")

# This dictionary does a bunch of heavy lifting for help output:
# - Enables avoiding additional (costly) imports for presenting `--help`.
# - The ordering matters for help display.
#
# Even though the module path starts with the same "pip._internal.commands"
# prefix, the full path makes testing easier (specifically when modifying
# `commands_dict` in test setup / teardown).
commands_dict: Dict[str, CommandInfo] = {
    "install": CommandInfo(
        "pip._internal.commands.install",
        "InstallCommand",
        "Install packages.",
    ),
    "download": CommandInfo(
        "pip._internal.commands.download",
        "DownloadCommand",
        "Download packages.",
    ),
    "uninstall": CommandInfo(
        "pip._internal.commands.uninstall",
        "UninstallCommand",
        "Uninstall packages.",
    ),
    "freeze": CommandInfo(
        "pip._internal.commands.freeze",
        "FreezeCommand",
        "Output installed packages in requirements format.",
    ),
    "inspect": CommandInfo(
        "pip._internal.commands.inspect",
        "InspectCommand",
        "Inspect the python environment.",
    ),
    "list": CommandInfo(
        "pip._internal.commands.list",
        "ListCommand",
        "List installed packages.",
    ),
    "show": CommandInfo(
        "pip._internal.commands.show",
        "ShowCommand",
        "Show information about installed packages.",
    ),
    "check": CommandInfo(
        "pip._internal.commands.check",
        "CheckCommand",
        "Verify installed packages have compatible dependencies.",
    ),
    "config": CommandInfo(
        "pip._internal.commands.configuration",
        "ConfigurationCommand",
        "Manage local and global configuration.",
    ),
    "search": CommandInfo(
        "pip._internal.commands.search",
        "SearchCommand",
        "Search PyPI for packages.",
    ),
    "cache": CommandInfo(
        "pip._internal.commands.cache",
        "CacheCommand",
        "Inspect and manage pip's wheel cache.",
    ),
    "index": CommandInfo(
        "pip._internal.commands.index",
        "IndexCommand",
        "Inspect information available from package indexes.",
    ),
    "wheel": CommandInfo(
        "pip._internal.commands.wheel",
        "WheelCommand",
        "Build wheels from your requirements.",
    ),
    "hash": CommandInfo(
        "pip._internal.commands.hash",
        "HashCommand",
        "Compute hashes of package archives.",
    ),
    "completion": CommandInfo(
        "pip._internal.commands.completion",
        "CompletionCommand",
        "A helper command used for command completion.",
    ),
    "debug": CommandInfo(
        "pip._internal.commands.debug",
        "DebugCommand",
        "Show information useful for debugging.",
    ),
    "help": CommandInfo(
        "pip._internal.commands.help",
        "HelpCommand",
        "Show help for commands.",
    ),
}


def create_command(name: str, **kwargs: Any) -> Command:
    """
    Create an instance of the Command class with the given name.
    """
    module_path, class_name, summary = commands_dict[name]
    module = importlib.import_module(module_path)
    command_class = getattr(module, class_name)
    command = command_class(name=name, summary=summary, **kwargs)

    return command


def get_similar_commands(name: str) -> Optional[str]:
    """Command name auto-correct."""
    from difflib import get_close_matches

    name = name.lower()

    close_commands = get_close_matches(name, commands_dict.keys())

    if close_commands:
        return close_commands[0]
    else:
        return None

from typing import Optional

from pip._internal.models.direct_url import ArchiveInfo, DirectUrl, DirInfo, VcsInfo
from pip._internal.models.link import Link
from pip._internal.utils.urls import path_to_url
from pip._internal.vcs import vcs


def direct_url_as_pep440_direct_reference(direct_url: DirectUrl, name: str) -> str:
    """Convert a DirectUrl to a pip requirement string."""
    direct_url.validate()  # if invalid, this is a pip bug
    requirement = name + " @ "
    fragments = []
    if isinstance(direct_url.info, VcsInfo):
        requirement += (
            f"{direct_url.info.vcs}+{direct_url.url}@{direct_url.info.commit_id}"
        )
    elif isinstance(direct_url.info, ArchiveInfo):
        requirement += direct_url.url
        if direct_url.info.hash:
            fragments.append(direct_url.info.hash)
    else:
        assert isinstance(direct_url.info, DirInfo)
        requirement += direct_url.url
    if direct_url.subdirectory:
        fragments.append("subdirectory=" + direct_url.subdirectory)
    if fragments:
        requirement += "#" + "&".join(fragments)
    return requirement


def direct_url_for_editable(source_dir: str) -> DirectUrl:
    return DirectUrl(
        url=path_to_url(source_dir),
        info=DirInfo(editable=True),
    )


def direct_url_from_link(
    link: Link, source_dir: Optional[str] = None, link_is_in_wheel_cache: bool = False
) -> DirectUrl:
    if link.is_vcs:
        vcs_backend = vcs.get_backend_for_scheme(link.scheme)
        assert vcs_backend
        url, requested_revision, _ = vcs_backend.get_url_rev_and_auth(
            link.url_without_fragment
        )
        # For VCS links, we need to find out and add commit_id.
        if link_is_in_wheel_cache:
            # If the requested VCS link corresponds to a cached
            # wheel, it means the requested revision was an
            # immutable commit hash, otherwise it would not have
            # been cached. In that case we don't have a source_dir
            # with the VCS checkout.
            assert requested_revision
            commit_id = requested_revision
        else:
            # If the wheel was not in cache, it means we have
            # had to checkout from VCS to build and we have a source_dir
            # which we can inspect to find out the commit id.
            assert source_dir
            commit_id = vcs_backend.get_revision(source_dir)
        return DirectUrl(
            url=url,
            info=VcsInfo(
                vcs=vcs_backend.name,
                commit_id=commit_id,
                requested_revision=requested_revision,
            ),
            subdirectory=link.subdirectory_fragment,
        )
    elif link.is_existing_dir():
        return DirectUrl(
            url=link.url_without_fragment,
            info=DirInfo(),
            subdirectory=link.subdirectory_fragment,
        )
    else:
        hash = None
        hash_name = link.hash_name
        if hash_name:
            hash = f"{hash_name}={link.hash}"
        return DirectUrl(
            url=link.url_without_fragment,
            info=ArchiveInfo(hash=hash),
            subdirectory=link.subdirectory_fragment,
        )