"""A package should contain a link to the actual file."""
from __future__ import annotations

import functools
import os
import sys
import urllib.parse as parse
from pathlib import Path
from urllib.request import pathname2url, url2pathname

WINDOWS = sys.platform == "win32"


def parse_query(query: str) -> dict[str, str]:
    """Parse the query string of a url."""
    return {k: v[0] for k, v in parse.parse_qs(query).items()}


def add_ssh_scheme_to_git_uri(uri: str) -> str:
    """Cleans VCS uris from pip format"""
    # Add scheme for parsing purposes, this is also what pip does
    if "://" not in uri:
        uri = "ssh://" + uri
        parsed = parse.urlparse(uri)
        if ":" in parsed.netloc:
            netloc, _, path_start = parsed.netloc.rpartition(":")
            path = "/{0}{1}".format(path_start, parsed.path)
            uri = parse.urlunparse(parsed._replace(netloc=netloc, path=path))
    return uri


def strip_extras(name: str) -> str:
    """Strip the extras part following package name."""
    return name.split("[", 1)[0]


def build_url_from_netloc(netloc: str, scheme: str = "https") -> str:
    """
    Build a full URL from a netloc.
    """
    if netloc.count(":") >= 2 and "@" not in netloc and "[" not in netloc:
        # It must be a bare IPv6 address, so wrap it with brackets.
        netloc = f"[{netloc}]"
    return f"{scheme}://{netloc}"


def parse_netloc(netloc: str) -> tuple[str, int | None]:
    """
    Return the host-port pair from a netloc.
    """
    url = build_url_from_netloc(netloc)
    parsed = parse.urlparse(url)
    return parsed.hostname or "", parsed.port


def url_to_path(url: str) -> str:
    """
    Convert a file: URL to a path.
    """
    assert url.startswith(
        "file:"
    ), f"You can only turn file: urls into filenames (not {url!r})"

    _, netloc, path, _, _ = parse.urlsplit(url)

    if not netloc or netloc == "localhost":
        # According to RFC 8089, same as empty authority.
        netloc = ""
    elif WINDOWS:
        # If we have a UNC path, prepend UNC share notation.
        netloc = "\\\\" + netloc
    else:
        raise ValueError(
            f"non-local file URIs are not supported on this platform: {url!r}"
        )

    path = url2pathname(netloc + path)

    # On Windows, urlsplit parses the path as something like "/C:/Users/foo".
    # This creates issues for path-related functions like io.open(), so we try
    # to detect and strip the leading slash.
    if (
        WINDOWS
        and not netloc  # Not UNC.
        and len(path) >= 3
        and path[0] == "/"  # Leading slash to strip.
        and path[1].isalpha()  # Drive letter.
        and path[2:4] in (":", ":/")  # Colon + end of string, or colon + absolute path.
    ):
        path = path[1:]

    return path


def path_to_url(path: str) -> str:
    """
    Convert a path to a file: URL.  The path will be made absolute and have
    quoted path parts.
    """
    path = os.path.normpath(os.path.abspath(path))
    url = parse.urljoin("file:", pathname2url(path))
    return url


WHEEL_EXTENSION = ".whl"
BZ2_EXTENSIONS = (".tar.bz2", ".tbz")
XZ_EXTENSIONS = (
    ".tar.xz",
    ".txz",
    ".tlz",
    ".tar.lz",
    ".tar.lzma",
)
ZIP_EXTENSIONS = (".zip", WHEEL_EXTENSION)
TAR_EXTENSIONS = (".tar.gz", ".tgz", ".tar")
ARCHIVE_EXTENSIONS = ZIP_EXTENSIONS + BZ2_EXTENSIONS + TAR_EXTENSIONS + XZ_EXTENSIONS


def is_archive_file(name: str) -> bool:
    """Return True if `name` is a considered as an archive file."""
    ext = splitext(name)[1].lower()
    return ext in ARCHIVE_EXTENSIONS


def split_auth_from_netloc(netloc: str) -> tuple[tuple[str, str | None] | None, str]:
    auth, has_auth, host = netloc.rpartition("@")
    if not has_auth:
        return None, host
    user, _, password = auth.partition(":")
    return (parse.unquote(user), parse.unquote(password) if password else None), host


@functools.lru_cache(maxsize=128)
def split_auth_from_url(url: str) -> tuple[tuple[str, str | None] | None, str]:
    """Return a tuple of ((username, password), url_without_auth)"""
    parsed = parse.urlparse(url)
    auth, netloc = split_auth_from_netloc(parsed.netloc)
    if auth is None:
        return None, url
    return auth, parse.urlunparse(parsed._replace(netloc=netloc))


@functools.lru_cache(maxsize=128)
def compare_urls(left: str, right: str) -> bool:
    """
    Compare two urls, ignoring the ending slash.
    """
    return parse.unquote(left).rstrip("/") == parse.unquote(right).rstrip("/")


def display_path(path: Path) -> str:
    """Show the path relative to cwd if possible"""
    if not path.is_absolute():
        return str(path)
    try:
        relative = path.absolute().relative_to(Path.cwd())
    except ValueError:
        return str(path)
    else:
        return str(relative)


def splitext(path: str) -> tuple[str, str]:
    """Like os.path.splitext but also takes off the .tar part"""
    base, ext = os.path.splitext(path)
    if base.lower().endswith(".tar"):
        ext = base[-4:] + ext
        base = base[:-4]
    return base, ext
