"""
Requirements file parsing
"""

import logging
import optparse
import os
import re
import shlex
import urllib.parse
from optparse import Values
from typing import (
    TYPE_CHECKING,
    Any,
    Callable,
    Dict,
    Generator,
    Iterable,
    List,
    NoReturn,
    Optional,
    Tuple,
)

from pip._internal.cli import cmdoptions
from pip._internal.exceptions import InstallationError, RequirementsFileParseError
from pip._internal.models.search_scope import SearchScope
from pip._internal.utils.encoding import auto_decode

if TYPE_CHECKING:
    from pip._internal.index.package_finder import PackageFinder
    from pip._internal.network.session import PipSession

__all__ = ["parse_requirements"]

ReqFileLines = Iterable[Tuple[int, str]]

LineParser = Callable[[str], Tuple[str, Values]]

SCHEME_RE = re.compile(r"^(http|https|file):", re.I)
COMMENT_RE = re.compile(r"(^|\s+)#.*$")

# Matches environment variable-style values in '${MY_VARIABLE_1}' with the
# variable name consisting of only uppercase letters, digits or the '_'
# (underscore). This follows the POSIX standard defined in IEEE Std 1003.1,
# 2013 Edition.
ENV_VAR_RE = re.compile(r"(?P<var>\$\{(?P<name>[A-Z0-9_]+)\})")

SUPPORTED_OPTIONS: List[Callable[..., optparse.Option]] = [
    cmdoptions.index_url,
    cmdoptions.extra_index_url,
    cmdoptions.no_index,
    cmdoptions.constraints,
    cmdoptions.requirements,
    cmdoptions.editable,
    cmdoptions.find_links,
    cmdoptions.no_binary,
    cmdoptions.only_binary,
    cmdoptions.prefer_binary,
    cmdoptions.require_hashes,
    cmdoptions.pre,
    cmdoptions.trusted_host,
    cmdoptions.use_new_feature,
]

# options to be passed to requirements
SUPPORTED_OPTIONS_REQ: List[Callable[..., optparse.Option]] = [
    cmdoptions.global_options,
    cmdoptions.hash,
    cmdoptions.config_settings,
]

SUPPORTED_OPTIONS_EDITABLE_REQ: List[Callable[..., optparse.Option]] = [
    cmdoptions.config_settings,
]


# the 'dest' string values
SUPPORTED_OPTIONS_REQ_DEST = [str(o().dest) for o in SUPPORTED_OPTIONS_REQ]
SUPPORTED_OPTIONS_EDITABLE_REQ_DEST = [
    str(o().dest) for o in SUPPORTED_OPTIONS_EDITABLE_REQ
]

logger = logging.getLogger(__name__)


class ParsedRequirement:
    def __init__(
        self,
        requirement: str,
        is_editable: bool,
        comes_from: str,
        constraint: bool,
        options: Optional[Dict[str, Any]] = None,
        line_source: Optional[str] = None,
    ) -> None:
        self.requirement = requirement
        self.is_editable = is_editable
        self.comes_from = comes_from
        self.options = options
        self.constraint = constraint
        self.line_source = line_source


class ParsedLine:
    def __init__(
        self,
        filename: str,
        lineno: int,
        args: str,
        opts: Values,
        constraint: bool,
    ) -> None:
        self.filename = filename
        self.lineno = lineno
        self.opts = opts
        self.constraint = constraint

        if args:
            self.is_requirement = True
            self.is_editable = False
            self.requirement = args
        elif opts.editables:
            self.is_requirement = True
            self.is_editable = True
            # We don't support multiple -e on one line
            self.requirement = opts.editables[0]
        else:
            self.is_requirement = False


def parse_requirements(
    filename: str,
    session: "PipSession",
    finder: Optional["PackageFinder"] = None,
    options: Optional[optparse.Values] = None,
    constraint: bool = False,
) -> Generator[ParsedRequirement, None, None]:
    """Parse a requirements file and yield ParsedRequirement instances.

    :param filename:    Path or url of requirements file.
    :param session:     PipSession instance.
    :param finder:      Instance of pip.index.PackageFinder.
    :param options:     cli options.
    :param constraint:  If true, parsing a constraint file rather than
        requirements file.
    """
    line_parser = get_line_parser(finder)
    parser = RequirementsFileParser(session, line_parser)

    for parsed_line in parser.parse(filename, constraint):
        parsed_req = handle_line(
            parsed_line, options=options, finder=finder, session=session
        )
        if parsed_req is not None:
            yield parsed_req


def preprocess(content: str) -> ReqFileLines:
    """Split, filter, and join lines, and return a line iterator

    :param content: the content of the requirements file
    """
    lines_enum: ReqFileLines = enumerate(content.splitlines(), start=1)
    lines_enum = join_lines(lines_enum)
    lines_enum = ignore_comments(lines_enum)
    lines_enum = expand_env_variables(lines_enum)
    return lines_enum


def handle_requirement_line(
    line: ParsedLine,
    options: Optional[optparse.Values] = None,
) -> ParsedRequirement:
    # preserve for the nested code path
    line_comes_from = "{} {} (line {})".format(
        "-c" if line.constraint else "-r",
        line.filename,
        line.lineno,
    )

    assert line.is_requirement

    # get the options that apply to requirements
    if line.is_editable:
        supported_dest = SUPPORTED_OPTIONS_EDITABLE_REQ_DEST
    else:
        supported_dest = SUPPORTED_OPTIONS_REQ_DEST
    req_options = {}
    for dest in supported_dest:
        if dest in line.opts.__dict__ and line.opts.__dict__[dest]:
            req_options[dest] = line.opts.__dict__[dest]

    line_source = f"line {line.lineno} of {line.filename}"
    return ParsedRequirement(
        requirement=line.requirement,
        is_editable=line.is_editable,
        comes_from=line_comes_from,
        constraint=line.constraint,
        options=req_options,
        line_source=line_source,
    )


def handle_option_line(
    opts: Values,
    filename: str,
    lineno: int,
    finder: Optional["PackageFinder"] = None,
    options: Optional[optparse.Values] = None,
    session: Optional["PipSession"] = None,
) -> None:
    if opts.hashes:
        logger.warning(
            "%s line %s has --hash but no requirement, and will be ignored.",
            filename,
            lineno,
        )

    if options:
        # percolate options upward
        if opts.require_hashes:
            options.require_hashes = opts.require_hashes
        if opts.features_enabled:
            options.features_enabled.extend(
                f for f in opts.features_enabled if f not in options.features_enabled
            )

    # set finder options
    if finder:
        find_links = finder.find_links
        index_urls = finder.index_urls
        no_index = finder.search_scope.no_index
        if opts.no_index is True:
            no_index = True
            index_urls = []
        if opts.index_url and not no_index:
            index_urls = [opts.index_url]
        if opts.extra_index_urls and not no_index:
            index_urls.extend(opts.extra_index_urls)
        if opts.find_links:
            # FIXME: it would be nice to keep track of the source
            # of the find_links: support a find-links local path
            # relative to a requirements file.
            value = opts.find_links[0]
            req_dir = os.path.dirname(os.path.abspath(filename))
            relative_to_reqs_file = os.path.join(req_dir, value)
            if os.path.exists(relative_to_reqs_file):
                value = relative_to_reqs_file
            find_links.append(value)

        if session:
            # We need to update the auth urls in session
            session.update_index_urls(index_urls)

        search_scope = SearchScope(
            find_links=find_links,
            index_urls=index_urls,
            no_index=no_index,
        )
        finder.search_scope = search_scope

        if opts.pre:
            finder.set_allow_all_prereleases()

        if opts.prefer_binary:
            finder.set_prefer_binary()

        if session:
            for host in opts.trusted_hosts or []:
                source = f"line {lineno} of {filename}"
                session.add_trusted_host(host, source=source)


def handle_line(
    line: ParsedLine,
    options: Optional[optparse.Values] = None,
    finder: Optional["PackageFinder"] = None,
    session: Optional["PipSession"] = None,
) -> Optional[ParsedRequirement]:
    """Handle a single parsed requirements line; This can result in
    creating/yielding requirements, or updating the finder.

    :param line:        The parsed line to be processed.
    :param options:     CLI options.
    :param finder:      The finder - updated by non-requirement lines.
    :param session:     The session - updated by non-requirement lines.

    Returns a ParsedRequirement object if the line is a requirement line,
    otherwise returns None.

    For lines that contain requirements, the only options that have an effect
    are from SUPPORTED_OPTIONS_REQ, and they are scoped to the
    requirement. Other options from SUPPORTED_OPTIONS may be present, but are
    ignored.

    For lines that do not contain requirements, the only options that have an
    effect are from SUPPORTED_OPTIONS. Options from SUPPORTED_OPTIONS_REQ may
    be present, but are ignored. These lines may contain multiple options
    (although our docs imply only one is supported), and all our parsed and
    affect the finder.
    """

    if line.is_requirement:
        parsed_req = handle_requirement_line(line, options)
        return parsed_req
    else:
        handle_option_line(
            line.opts,
            line.filename,
            line.lineno,
            finder,
            options,
            session,
        )
        return None


class RequirementsFileParser:
    def __init__(
        self,
        session: "PipSession",
        line_parser: LineParser,
    ) -> None:
        self._session = session
        self._line_parser = line_parser

    def parse(
        self, filename: str, constraint: bool
    ) -> Generator[ParsedLine, None, None]:
        """Parse a given file, yielding parsed lines."""
        yield from self._parse_and_recurse(
            filename, constraint, [{os.path.abspath(filename): None}]
        )

    def _parse_and_recurse(
        self,
        filename: str,
        constraint: bool,
        parsed_files_stack: List[Dict[str, Optional[str]]],
    ) -> Generator[ParsedLine, None, None]:
        for line in self._parse_file(filename, constraint):
            if not line.is_requirement and (
                line.opts.requirements or line.opts.constraints
            ):
                # parse a nested requirements file
                if line.opts.requirements:
                    req_path = line.opts.requirements[0]
                    nested_constraint = False
                else:
                    req_path = line.opts.constraints[0]
                    nested_constraint = True

                # original file is over http
                if SCHEME_RE.search(filename):
                    # do a url join so relative paths work
                    req_path = urllib.parse.urljoin(filename, req_path)
                # original file and nested file are paths
                elif not SCHEME_RE.search(req_path):
                    # do a join so relative paths work
                    # and then abspath so that we can identify recursive references
                    req_path = os.path.abspath(
                        os.path.join(
                            os.path.dirname(filename),
                            req_path,
                        )
                    )
                parsed_files = parsed_files_stack[0]
                if req_path in parsed_files:
                    initial_file = parsed_files[req_path]
                    tail = (
                        f" and again in {initial_file}"
                        if initial_file is not None
                        else ""
                    )
                    raise RequirementsFileParseError(
                        f"{req_path} recursively references itself in {filename}{tail}"
                    )
                # Keeping a track where was each file first included in
                new_parsed_files = parsed_files.copy()
                new_parsed_files[req_path] = filename
                yield from self._parse_and_recurse(
                    req_path, nested_constraint, [new_parsed_files, *parsed_files_stack]
                )
            else:
                yield line

    def _parse_file(
        self, filename: str, constraint: bool
    ) -> Generator[ParsedLine, None, None]:
        _, content = get_file_content(filename, self._session)

        lines_enum = preprocess(content)

        for line_number, line in lines_enum:
            try:
                args_str, opts = self._line_parser(line)
            except OptionParsingError as e:
                # add offending line
                msg = f"Invalid requirement: {line}\n{e.msg}"
                raise RequirementsFileParseError(msg)

            yield ParsedLine(
                filename,
                line_number,
                args_str,
                opts,
                constraint,
            )


def get_line_parser(finder: Optional["PackageFinder"]) -> LineParser:
    def parse_line(line: str) -> Tuple[str, Values]:
        # Build new parser for each line since it accumulates appendable
        # options.
        parser = build_parser()
        defaults = parser.get_default_values()
        defaults.index_url = None
        if finder:
            defaults.format_control = finder.format_control

        args_str, options_str = break_args_options(line)

        try:
            options = shlex.split(options_str)
        except ValueError as e:
            raise OptionParsingError(f"Could not split options: {options_str}") from e

        opts, _ = parser.parse_args(options, defaults)

        return args_str, opts

    return parse_line


def break_args_options(line: str) -> Tuple[str, str]:
    """Break up the line into an args and options string.  We only want to shlex
    (and then optparse) the options, not the args.  args can contain markers
    which are corrupted by shlex.
    """
    tokens = line.split(" ")
    args = []
    options = tokens[:]
    for token in tokens:
        if token.startswith("-") or token.startswith("--"):
            break
        else:
            args.append(token)
            options.pop(0)
    return " ".join(args), " ".join(options)


class OptionParsingError(Exception):
    def __init__(self, msg: str) -> None:
        self.msg = msg


def build_parser() -> optparse.OptionParser:
    """
    Return a parser for parsing requirement lines
    """
    parser = optparse.OptionParser(add_help_option=False)

    option_factories = SUPPORTED_OPTIONS + SUPPORTED_OPTIONS_REQ
    for option_factory in option_factories:
        option = option_factory()
        parser.add_option(option)

    # By default optparse sys.exits on parsing errors. We want to wrap
    # that in our own exception.
    def parser_exit(self: Any, msg: str) -> "NoReturn":
        raise OptionParsingError(msg)

    # NOTE: mypy disallows assigning to a method
    #       https://github.com/python/mypy/issues/2427
    parser.exit = parser_exit  # type: ignore

    return parser


def join_lines(lines_enum: ReqFileLines) -> ReqFileLines:
    """Joins a line ending in '\' with the previous line (except when following
    comments).  The joined line takes on the index of the first line.
    """
    primary_line_number = None
    new_line: List[str] = []
    for line_number, line in lines_enum:
        if not line.endswith("\\") or COMMENT_RE.match(line):
            if COMMENT_RE.match(line):
                # this ensures comments are always matched later
                line = " " + line
            if new_line:
                new_line.append(line)
                assert primary_line_number is not None
                yield primary_line_number, "".join(new_line)
                new_line = []
            else:
                yield line_number, line
        else:
            if not new_line:
                primary_line_number = line_number
            new_line.append(line.strip("\\"))

    # last line contains \
    if new_line:
        assert primary_line_number is not None
        yield primary_line_number, "".join(new_line)

    # TODO: handle space after '\'.


def ignore_comments(lines_enum: ReqFileLines) -> ReqFileLines:
    """
    Strips comments and filter empty lines.
    """
    for line_number, line in lines_enum:
        line = COMMENT_RE.sub("", line)
        line = line.strip()
        if line:
            yield line_number, line


def expand_env_variables(lines_enum: ReqFileLines) -> ReqFileLines:
    """Replace all environment variables that can be retrieved via `os.getenv`.

    The only allowed format for environment variables defined in the
    requirement file is `${MY_VARIABLE_1}` to ensure two things:

    1. Strings that contain a `$` aren't accidentally (partially) expanded.
    2. Ensure consistency across platforms for requirement files.

    These points are the result of a discussion on the `github pull
    request #3514 <https://github.com/pypa/pip/pull/3514>`_.

    Valid characters in variable names follow the `POSIX standard
    <http://pubs.opengroup.org/onlinepubs/9699919799/>`_ and are limited
    to uppercase letter, digits and the `_` (underscore).
    """
    for line_number, line in lines_enum:
        for env_var, var_name in ENV_VAR_RE.findall(line):
            value = os.getenv(var_name)
            if not value:
                continue

            line = line.replace(env_var, value)

        yield line_number, line


def get_file_content(url: str, session: "PipSession") -> Tuple[str, str]:
    """Gets the content of a file; it may be a filename, file: URL, or
    http: URL.  Returns (location, content).  Content is unicode.
    Respects # -*- coding: declarations on the retrieved files.

    :param url:         File path or url.
    :param session:     PipSession instance.
    """
    scheme = urllib.parse.urlsplit(url).scheme
    # Pip has special support for file:// URLs (LocalFSAdapter).
    if scheme in ["http", "https", "file"]:
        # Delay importing heavy network modules until absolutely necessary.
        from pip._internal.network.utils import raise_for_status

        resp = session.get(url)
        raise_for_status(resp)
        return resp.url, resp.text

    # Assume this is a bare path.
    try:
        with open(url, "rb") as f:
            content = auto_decode(f.read())
    except OSError as exc:
        raise InstallationError(f"Could not open requirements file: {exc}")
    return url, content

import sys
from typing import TYPE_CHECKING, Iterable, List

if sys.version_info >= (3, 8):
    from typing import Literal
else:
    from pip._vendor.typing_extensions import Literal  # pragma: no cover


from ._loop import loop_last

if TYPE_CHECKING:
    from pip._vendor.rich.console import ConsoleOptions


class Box:
    """Defines characters to render boxes.

    ┌─┬┐ top
    │ ││ head
    ├─┼┤ head_row
    │ ││ mid
    ├─┼┤ row
    ├─┼┤ foot_row
    │ ││ foot
    └─┴┘ bottom

    Args:
        box (str): Characters making up box.
        ascii (bool, optional): True if this box uses ascii characters only. Default is False.
    """

    def __init__(self, box: str, *, ascii: bool = False) -> None:
        self._box = box
        self.ascii = ascii
        line1, line2, line3, line4, line5, line6, line7, line8 = box.splitlines()
        # top
        self.top_left, self.top, self.top_divider, self.top_right = iter(line1)
        # head
        self.head_left, _, self.head_vertical, self.head_right = iter(line2)
        # head_row
        (
            self.head_row_left,
            self.head_row_horizontal,
            self.head_row_cross,
            self.head_row_right,
        ) = iter(line3)

        # mid
        self.mid_left, _, self.mid_vertical, self.mid_right = iter(line4)
        # row
        self.row_left, self.row_horizontal, self.row_cross, self.row_right = iter(line5)
        # foot_row
        (
            self.foot_row_left,
            self.foot_row_horizontal,
            self.foot_row_cross,
            self.foot_row_right,
        ) = iter(line6)
        # foot
        self.foot_left, _, self.foot_vertical, self.foot_right = iter(line7)
        # bottom
        self.bottom_left, self.bottom, self.bottom_divider, self.bottom_right = iter(
            line8
        )

    def __repr__(self) -> str:
        return "Box(...)"

    def __str__(self) -> str:
        return self._box

    def substitute(self, options: "ConsoleOptions", safe: bool = True) -> "Box":
        """Substitute this box for another if it won't render due to platform issues.

        Args:
            options (ConsoleOptions): Console options used in rendering.
            safe (bool, optional): Substitute this for another Box if there are known problems
                displaying on the platform (currently only relevant on Windows). Default is True.

        Returns:
            Box: A different Box or the same Box.
        """
        box = self
        if options.legacy_windows and safe:
            box = LEGACY_WINDOWS_SUBSTITUTIONS.get(box, box)
        if options.ascii_only and not box.ascii:
            box = ASCII
        return box

    def get_plain_headed_box(self) -> "Box":
        """If this box uses special characters for the borders of the header, then
        return the equivalent box that does not.

        Returns:
            Box: The most similar Box that doesn't use header-specific box characters.
                If the current Box already satisfies this criterion, then it's returned.
        """
        return PLAIN_HEADED_SUBSTITUTIONS.get(self, self)

    def get_top(self, widths: Iterable[int]) -> str:
        """Get the top of a simple box.

        Args:
            widths (List[int]): Widths of columns.

        Returns:
            str: A string of box characters.
        """

        parts: List[str] = []
        append = parts.append
        append(self.top_left)
        for last, width in loop_last(widths):
            append(self.top * width)
            if not last:
                append(self.top_divider)
        append(self.top_right)
        return "".join(parts)

    def get_row(
        self,
        widths: Iterable[int],
        level: Literal["head", "row", "foot", "mid"] = "row",
        edge: bool = True,
    ) -> str:
        """Get the top of a simple box.

        Args:
            width (List[int]): Widths of columns.

        Returns:
            str: A string of box characters.
        """
        if level == "head":
            left = self.head_row_left
            horizontal = self.head_row_horizontal
            cross = self.head_row_cross
            right = self.head_row_right
        elif level == "row":
            left = self.row_left
            horizontal = self.row_horizontal
            cross = self.row_cross
            right = self.row_right
        elif level == "mid":
            left = self.mid_left
            horizontal = " "
            cross = self.mid_vertical
            right = self.mid_right
        elif level == "foot":
            left = self.foot_row_left
            horizontal = self.foot_row_horizontal
            cross = self.foot_row_cross
            right = self.foot_row_right
        else:
            raise ValueError("level must be 'head', 'row' or 'foot'")

        parts: List[str] = []
        append = parts.append
        if edge:
            append(left)
        for last, width in loop_last(widths):
            append(horizontal * width)
            if not last:
                append(cross)
        if edge:
            append(right)
        return "".join(parts)

    def get_bottom(self, widths: Iterable[int]) -> str:
        """Get the bottom of a simple box.

        Args:
            widths (List[int]): Widths of columns.

        Returns:
            str: A string of box characters.
        """

        parts: List[str] = []
        append = parts.append
        append(self.bottom_left)
        for last, width in loop_last(widths):
            append(self.bottom * width)
            if not last:
                append(self.bottom_divider)
        append(self.bottom_right)
        return "".join(parts)


# fmt: off
ASCII: Box = Box(
    "+--+\n"
    "| ||\n"
    "|-+|\n"
    "| ||\n"
    "|-+|\n"
    "|-+|\n"
    "| ||\n"
    "+--+\n",
    ascii=True,
)

ASCII2: Box = Box(
    "+-++\n"
    "| ||\n"
    "+-++\n"
    "| ||\n"
    "+-++\n"
    "+-++\n"
    "| ||\n"
    "+-++\n",
    ascii=True,
)

ASCII_DOUBLE_HEAD: Box = Box(
    "+-++\n"
    "| ||\n"
    "+=++\n"
    "| ||\n"
    "+-++\n"
    "+-++\n"
    "| ||\n"
    "+-++\n",
    ascii=True,
)

SQUARE: Box = Box(
    "┌─┬┐\n"
    "│ ││\n"
    "├─┼┤\n"
    "│ ││\n"
    "├─┼┤\n"
    "├─┼┤\n"
    "│ ││\n"
    "└─┴┘\n"
)

SQUARE_DOUBLE_HEAD: Box = Box(
    "┌─┬┐\n"
    "│ ││\n"
    "╞═╪╡\n"
    "│ ││\n"
    "├─┼┤\n"
    "├─┼┤\n"
    "│ ││\n"
    "└─┴┘\n"
)

MINIMAL: Box = Box(
    "  ╷ \n"
    "  │ \n"
    "╶─┼╴\n"
    "  │ \n"
    "╶─┼╴\n"
    "╶─┼╴\n"
    "  │ \n"
    "  ╵ \n"
)


MINIMAL_HEAVY_HEAD: Box = Box(
    "  ╷ \n"
    "  │ \n"
    "╺━┿╸\n"
    "  │ \n"
    "╶─┼╴\n"
    "╶─┼╴\n"
    "  │ \n"
    "  ╵ \n"
)

MINIMAL_DOUBLE_HEAD: Box = Box(
    "  ╷ \n"
    "  │ \n"
    " ═╪ \n"
    "  │ \n"
    " ─┼ \n"
    " ─┼ \n"
    "  │ \n"
    "  ╵ \n"
)


SIMPLE: Box = Box(
    "    \n"
    "    \n"
    " ── \n"
    "    \n"
    "    \n"
    " ── \n"
    "    \n"
    "    \n"
)

SIMPLE_HEAD: Box = Box(
    "    \n"
    "    \n"
    " ── \n"
    "    \n"
    "    \n"
    "    \n"
    "    \n"
    "    \n"
)


SIMPLE_HEAVY: Box = Box(
    "    \n"
    "    \n"
    " ━━ \n"
    "    \n"
    "    \n"
    " ━━ \n"
    "    \n"
    "    \n"
)


HORIZONTALS: Box = Box(
    " ── \n"
    "    \n"
    " ── \n"
    "    \n"
    " ── \n"
    " ── \n"
    "    \n"
    " ── \n"
)

ROUNDED: Box = Box(
    "╭─┬╮\n"
    "│ ││\n"
    "├─┼┤\n"
    "│ ││\n"
    "├─┼┤\n"
    "├─┼┤\n"
    "│ ││\n"
    "╰─┴╯\n"
)

HEAVY: Box = Box(
    "┏━┳┓\n"
    "┃ ┃┃\n"
    "┣━╋┫\n"
    "┃ ┃┃\n"
    "┣━╋┫\n"
    "┣━╋┫\n"
    "┃ ┃┃\n"
    "┗━┻┛\n"
)

HEAVY_EDGE: Box = Box(
    "┏━┯┓\n"
    "┃ │┃\n"
    "┠─┼┨\n"
    "┃ │┃\n"
    "┠─┼┨\n"
    "┠─┼┨\n"
    "┃ │┃\n"
    "┗━┷┛\n"
)

HEAVY_HEAD: Box = Box(
    "┏━┳┓\n"
    "┃ ┃┃\n"
    "┡━╇┩\n"
    "│ ││\n"
    "├─┼┤\n"
    "├─┼┤\n"
    "│ ││\n"
    "└─┴┘\n"
)

DOUBLE: Box = Box(
    "╔═╦╗\n"
    "║ ║║\n"
    "╠═╬╣\n"
    "║ ║║\n"
    "╠═╬╣\n"
    "╠═╬╣\n"
    "║ ║║\n"
    "╚═╩╝\n"
)

DOUBLE_EDGE: Box = Box(
    "╔═╤╗\n"
    "║ │║\n"
    "╟─┼╢\n"
    "║ │║\n"
    "╟─┼╢\n"
    "╟─┼╢\n"
    "║ │║\n"
    "╚═╧╝\n"
)

MARKDOWN: Box = Box(
    "    \n"
    "| ||\n"
    "|-||\n"
    "| ||\n"
    "|-||\n"
    "|-||\n"
    "| ||\n"
    "    \n",
    ascii=True,
)
# fmt: on

# Map Boxes that don't render with raster fonts on to equivalent that do
LEGACY_WINDOWS_SUBSTITUTIONS = {
    ROUNDED: SQUARE,
    MINIMAL_HEAVY_HEAD: MINIMAL,
    SIMPLE_HEAVY: SIMPLE,
    HEAVY: SQUARE,
    HEAVY_EDGE: SQUARE,
    HEAVY_HEAD: SQUARE,
}

# Map headed boxes to their headerless equivalents
PLAIN_HEADED_SUBSTITUTIONS = {
    HEAVY_HEAD: SQUARE,
    SQUARE_DOUBLE_HEAD: SQUARE,
    MINIMAL_DOUBLE_HEAD: MINIMAL,
    MINIMAL_HEAVY_HEAD: MINIMAL,
    ASCII_DOUBLE_HEAD: ASCII2,
}


if __name__ == "__main__":  # pragma: no cover
    from pip._vendor.rich.columns import Columns
    from pip._vendor.rich.panel import Panel

    from . import box as box
    from .console import Console
    from .table import Table
    from .text import Text

    console = Console(record=True)

    BOXES = [
        "ASCII",
        "ASCII2",
        "ASCII_DOUBLE_HEAD",
        "SQUARE",
        "SQUARE_DOUBLE_HEAD",
        "MINIMAL",
        "MINIMAL_HEAVY_HEAD",
        "MINIMAL_DOUBLE_HEAD",
        "SIMPLE",
        "SIMPLE_HEAD",
        "SIMPLE_HEAVY",
        "HORIZONTALS",
        "ROUNDED",
        "HEAVY",
        "HEAVY_EDGE",
        "HEAVY_HEAD",
        "DOUBLE",
        "DOUBLE_EDGE",
        "MARKDOWN",
    ]

    console.print(Panel("[bold green]Box Constants", style="green"), justify="center")
    console.print()

    columns = Columns(expand=True, padding=2)
    for box_name in sorted(BOXES):
        table = Table(
            show_footer=True, style="dim", border_style="not dim", expand=True
        )
        table.add_column("Header 1", "Footer 1")
        table.add_column("Header 2", "Footer 2")
        table.add_row("Cell", "Cell")
        table.add_row("Cell", "Cell")
        table.box = getattr(box, box_name)
        table.title = Text(f"box.{box_name}", style="magenta")
        columns.add_renderable(table)
    console.print(columns)

    # console.save_svg("box.svg")

from abc import ABC


class RichRenderable(ABC):
    """An abstract base class for Rich renderables.

    Note that there is no need to extend this class, the intended use is to check if an
    object supports the Rich renderable protocol. For example::

        if isinstance(my_object, RichRenderable):
            console.print(my_object)

    """

    @classmethod
    def __subclasshook__(cls, other: type) -> bool:
        """Check if this class supports the rich render protocol."""
        return hasattr(other, "__rich_console__") or hasattr(other, "__rich__")


if __name__ == "__main__":  # pragma: no cover
    from pip._vendor.rich.text import Text

    t = Text()
    print(isinstance(Text, RichRenderable))
    print(isinstance(t, RichRenderable))

    class Foo:
        pass

    f = Foo()
    print(isinstance(f, RichRenderable))
    print(isinstance("", RichRenderable))