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# The following comment should be removed at some point in the future.
# mypy: disallow-untyped-defs=False

from __future__ import absolute_import

import locale
import logging
import sys

from pip._internal.cli import cmdoptions
from pip._internal.cli.base_command import Command
from pip._internal.cli.cmdoptions import make_target_python
from pip._internal.cli.status_codes import SUCCESS
from pip._internal.utils.logging import indent_log
from pip._internal.utils.misc import get_pip_version
from pip._internal.utils.typing import MYPY_CHECK_RUNNING
from pip._internal.wheel import format_tag

if MYPY_CHECK_RUNNING:
    from typing import Any, List
    from optparse import Values

logger = logging.getLogger(__name__)


def show_value(name, value):
    # type: (str, str) -> None
    logger.info('{}: {}'.format(name, value))


def show_sys_implementation():
    # type: () -> None
    logger.info('sys.implementation:')
    if hasattr(sys, 'implementation'):
        implementation = sys.implementation  # type: ignore
        implementation_name = implementation.name
    else:
        implementation_name = ''

    with indent_log():
        show_value('name', implementation_name)


def show_tags(options):
    # type: (Values) -> None
    tag_limit = 10

    target_python = make_target_python(options)
    tags = target_python.get_tags()

    # Display the target options that were explicitly provided.
    formatted_target = target_python.format_given()
    suffix = ''
    if formatted_target:
        suffix = ' (target: {})'.format(formatted_target)

    msg = 'Compatible tags: {}{}'.format(len(tags), suffix)
    logger.info(msg)

    if options.verbose < 1 and len(tags) > tag_limit:
        tags_limited = True
        tags = tags[:tag_limit]
    else:
        tags_limited = False

    with indent_log():
        for tag in tags:
            logger.info(format_tag(tag))

        if tags_limited:
            msg = (
                '...\n'
                '[First {tag_limit} tags shown. Pass --verbose to show all.]'
            ).format(tag_limit=tag_limit)
            logger.info(msg)


class DebugCommand(Command):
    """
    Display debug information.
    """

    usage = """
      %prog <options>"""
    ignore_require_venv = True

    def __init__(self, *args, **kw):
        super(DebugCommand, self).__init__(*args, **kw)

        cmd_opts = self.cmd_opts
        cmdoptions.add_target_python_options(cmd_opts)
        self.parser.insert_option_group(0, cmd_opts)

    def run(self, options, args):
        # type: (Values, List[Any]) -> int
        logger.warning(
            "This command is only meant for debugging. "
            "Do not use this with automation for parsing and getting these "
            "details, since the output and options of this command may "
            "change without notice."
        )
        show_value('pip version', get_pip_version())
        show_value('sys.version', sys.version)
        show_value('sys.executable', sys.executable)
        show_value('sys.getdefaultencoding', sys.getdefaultencoding())
        show_value('sys.getfilesystemencoding', sys.getfilesystemencoding())
        show_value(
            'locale.getpreferredencoding', locale.getpreferredencoding(),
        )
        show_value('sys.platform', sys.platform)
        show_sys_implementation()

        show_tags(options)

        return SUCCESS