# Copyright (C) 2012 Anaconda, Inc
# SPDX-License-Identifier: BSD-3-Clause
"""Common URL utilities."""

import codecs
import re
import socket
from collections import namedtuple
from functools import lru_cache
from getpass import getpass
from os.path import abspath, expanduser
from urllib.parse import (  # noqa: F401
    ParseResult,
    quote,
    quote_plus,
    unquote,
    unquote_plus,
)
from urllib.parse import urlparse as _urlparse
from urllib.parse import urlunparse as _urlunparse  # noqa: F401

from .compat import on_win
from .path import split_filename, strip_pkg_extension


def hex_octal_to_int(ho):
    ho = ord(ho.upper())
    o0 = ord("0")
    o9 = ord("9")
    oA = ord("A")
    oF = ord("F")
    res = (
        ho - o0
        if ho >= o0 and ho <= o9
        else (ho - oA + 10)
        if ho >= oA and ho <= oF
        else None
    )
    return res


@lru_cache(maxsize=None)
def percent_decode(path):
    # This is not fast so avoid when we can.
    if "%" not in path:
        return path
    ranges = []
    for m in re.finditer(r"(%[0-9A-F]{2})", path, flags=re.IGNORECASE):
        ranges.append((m.start(), m.end()))
    if not len(ranges):
        return path

    # Sorry! Correctness is more important than speed at the moment.
    # Should use a map + lambda eventually.
    result = b""
    skips = 0
    for i, c in enumerate(path):
        if skips > 0:
            skips -= 1
            continue
        c = c.encode("ascii")
        emit = c
        if c == b"%":
            for r in ranges:
                if i == r[0]:
                    import struct

                    emit = struct.pack(
                        "B",
                        hex_octal_to_int(path[i + 1]) * 16
                        + hex_octal_to_int(path[i + 2]),
                    )
                    skips = 2
                    break
        if emit:
            result += emit
    return codecs.utf_8_decode(result)[0]


file_scheme = "file://"

# Keeping this around for now, need to combine with the same function in conda/common/path.py
"""
def url_to_path(url):
    assert url.startswith(file_scheme), "{} is not a file-scheme URL".format(url)
    decoded = percent_decode(url[len(file_scheme):])
    if decoded.startswith('/') and decoded[2] == ':':
        # A Windows path.
        decoded.replace('/', '\\')
    return decoded
"""


@lru_cache(maxsize=None)
def path_to_url(path):
    if not path:
        raise ValueError(f"Not allowed: {path!r}")
    if path.startswith(file_scheme):
        try:
            path.decode("ascii")
        except UnicodeDecodeError:
            raise ValueError(
                f"Non-ascii not allowed for things claiming to be URLs: {path!r}"
            )
        return path
    path = abspath(expanduser(path)).replace("\\", "/")
    # We do not use urljoin here because we want to take our own
    # *very* explicit control of how paths get encoded into URLs.
    #   We should not follow any RFCs on how to encode and decode
    # them, we just need to make sure we can represent them in a
    # way that will not cause problems for whatever amount of
    # urllib processing we *do* need to do on them (which should
    # be none anyway, but I doubt that is the case). I have gone
    # for ASCII and % encoding of everything not alphanumeric or
    # not in `!'()*-._/:`. This should be pretty save.
    #
    # To avoid risking breaking the internet, this code only runs
    # for `file://` URLs.
    #
    percent_encode_chars = "!'()*-._/\\:"
    percent_encode = lambda s: "".join(
        [f"%{ord(c):02X}", c][c < "{" and c.isalnum() or c in percent_encode_chars]
        for c in s
    )
    if any(ord(char) >= 128 for char in path):
        path = percent_encode(
            path.decode("unicode-escape")
            if hasattr(path, "decode")
            else bytes(path, "utf-8").decode("unicode-escape")
        )

    # https://blogs.msdn.microsoft.com/ie/2006/12/06/file-uris-in-windows/
    if len(path) > 1 and path[1] == ":":
        path = file_scheme + "/" + path
    else:
        path = file_scheme + path
    return path


url_attrs = (
    "scheme",
    "path",
    "query",
    "fragment",
    "username",
    "password",
    "hostname",
    "port",
)


class Url(namedtuple("Url", url_attrs)):
    """
    Object used to represent a Url. The string representation of this object is a url string.

    This object was inspired by the urllib3 implementation as it gives you a way to construct
    URLs from various parts. The motivation behind this object was making something that is
    interoperable with built the `urllib.parse.urlparse` function and has more features than
    the built-in `ParseResult` object.
    """

    def __new__(
        cls,
        scheme=None,
        path=None,
        query=None,
        fragment=None,
        username=None,
        password=None,
        hostname=None,
        port=None,
    ):
        if path and not path.startswith("/"):
            path = "/" + path
        if scheme:
            scheme = scheme.lower()
        if hostname:
            hostname = hostname.lower()
        return super().__new__(
            cls, scheme, path, query, fragment, username, password, hostname, port
        )

    @property
    def auth(self):
        if self.username and self.password:
            return f"{self.username}:{self.password}"
        elif self.username:
            return self.username

    @property
    def netloc(self):
        if self.port:
            return f"{self.hostname}:{self.port}"
        return self.hostname

    def __str__(self):
        scheme, path, query, fragment, username, password, hostname, port = self
        url = ""

        if scheme:
            url += f"{scheme}://"
        if password and username:
            url += f"{username}:{password}@"
        if hostname:
            url += hostname
        if port:
            url += f":{port}"
        if path:
            url += path
        if query:
            url += f"?{query}"
        if fragment:
            url += f"#{fragment}"

        return url

    def as_dict(self) -> dict:
        """Provide a public interface for namedtuple's _asdict"""
        return self._asdict()

    def replace(self, **kwargs) -> "Url":
        """Provide a public interface for namedtuple's _replace"""
        return self._replace(**kwargs)

    @classmethod
    def from_parse_result(cls, parse_result: ParseResult) -> "Url":
        values = {fld: getattr(parse_result, fld, "") for fld in url_attrs}
        return cls(**values)


@lru_cache(maxsize=None)
def urlparse(url: str) -> Url:
    if on_win and url.startswith("file:"):
        url.replace("\\", "/")
    # Allows us to pass in strings like 'example.com:8080/path/1'.
    if not has_scheme(url):
        url = "//" + url
    return Url.from_parse_result(_urlparse(url))


def url_to_s3_info(url):
    """Convert an s3 url to a tuple of bucket and key.

    Examples:
        >>> url_to_s3_info("s3://bucket-name.bucket/here/is/the/key")
        ('bucket-name.bucket', '/here/is/the/key')
    """
    parsed_url = urlparse(url)
    assert parsed_url.scheme == "s3", f"You can only use s3: urls (not {url!r})"
    bucket, key = parsed_url.hostname, parsed_url.path
    return bucket, key


def is_url(url):
    """
    Examples:
        >>> is_url(None)
        False
        >>> is_url("s3://some/bucket")
        True
    """
    if not url:
        return False
    try:
        return urlparse(url).scheme != ""
    except ValueError:
        return False


def is_ipv4_address(string_ip):
    """
    Examples:
        >>> [is_ipv4_address(ip) for ip in ('8.8.8.8', '192.168.10.10', '255.255.255.255')]
        [True, True, True]
        >>> [is_ipv4_address(ip) for ip in ('8.8.8', '192.168.10.10.20', '256.255.255.255', '::1')]
        [False, False, False, False]
    """
    try:
        socket.inet_aton(string_ip)
    except OSError:
        return False
    return string_ip.count(".") == 3


def is_ipv6_address(string_ip):
    """
    Examples:
        >> [is_ipv6_address(ip) for ip in ('::1', '2001:db8:85a3::370:7334', '1234:'*7+'1234')]
        [True, True, True]
        >> [is_ipv6_address(ip) for ip in ('192.168.10.10', '1234:'*8+'1234')]
        [False, False]
    """
    try:
        socket.inet_pton(socket.AF_INET6, string_ip)
    except OSError:
        return False
    return True


def is_ip_address(string_ip):
    """
    Examples:
        >> is_ip_address('192.168.10.10')
        True
        >> is_ip_address('::1')
        True
        >> is_ip_address('www.google.com')
        False
    """
    return is_ipv4_address(string_ip) or is_ipv6_address(string_ip)


def join(*args):
    start = "/" if not args[0] or args[0].startswith("/") else ""
    return start + "/".join(y for y in (x.strip("/") for x in args if x) if y)


join_url = join


def has_scheme(value):
    return re.match(r"[a-z][a-z0-9]{0,11}://", value)


def strip_scheme(url):
    """
    Examples:
        >>> strip_scheme("https://www.conda.io")
        'www.conda.io'
        >>> strip_scheme("s3://some.bucket/plus/a/path.ext")
        'some.bucket/plus/a/path.ext'
    """
    return url.split("://", 1)[-1]


def mask_anaconda_token(url):
    _, token = split_anaconda_token(url)
    return url.replace(token, "<TOKEN>", 1) if token else url


def split_anaconda_token(url):
    """
    Examples:
        >>> split_anaconda_token("https://1.2.3.4/t/tk-123-456/path")
        (u'https://1.2.3.4/path', u'tk-123-456')
        >>> split_anaconda_token("https://1.2.3.4/t//path")
        (u'https://1.2.3.4/path', u'')
        >>> split_anaconda_token("https://some.domain/api/t/tk-123-456/path")
        (u'https://some.domain/api/path', u'tk-123-456')
        >>> split_anaconda_token("https://1.2.3.4/conda/t/tk-123-456/path")
        (u'https://1.2.3.4/conda/path', u'tk-123-456')
        >>> split_anaconda_token("https://1.2.3.4/path")
        (u'https://1.2.3.4/path', None)
        >>> split_anaconda_token("https://10.2.3.4:8080/conda/t/tk-123-45")
        (u'https://10.2.3.4:8080/conda', u'tk-123-45')
    """
    _token_match = re.search(r"/t/([a-zA-Z0-9-]*)", url)
    token = _token_match.groups()[0] if _token_match else None
    cleaned_url = url.replace("/t/" + token, "", 1) if token is not None else url
    return cleaned_url.rstrip("/"), token


def split_platform(known_subdirs, url):
    """

    Examples:
        >>> from conda.base.constants import KNOWN_SUBDIRS
        >>> split_platform(KNOWN_SUBDIRS, "https://1.2.3.4/t/tk-123/linux-ppc64le/path")
        (u'https://1.2.3.4/t/tk-123/path', u'linux-ppc64le')

    """
    _platform_match = _split_platform_re(known_subdirs).search(url)
    platform = _platform_match.groups()[0] if _platform_match else None
    cleaned_url = url.replace("/" + platform, "", 1) if platform is not None else url
    return cleaned_url.rstrip("/"), platform


@lru_cache(maxsize=None)
def _split_platform_re(known_subdirs):
    _platform_match_regex = r"/({})(?:/|$)".format(
        r"|".join(rf"{d}" for d in known_subdirs)
    )
    return re.compile(_platform_match_regex, re.IGNORECASE)


def has_platform(url, known_subdirs):
    url_no_package_name, _ = split_filename(url)
    if not url_no_package_name:
        return None
    maybe_a_platform = url_no_package_name.rsplit("/", 1)[-1]
    return maybe_a_platform in known_subdirs and maybe_a_platform or None


def split_scheme_auth_token(url):
    """
    Examples:
        >>> split_scheme_auth_token("https://u:p@conda.io/t/x1029384756/more/path")
        ('conda.io/more/path', 'https', 'u:p', 'x1029384756')
        >>> split_scheme_auth_token(None)
        (None, None, None, None)
    """
    if not url:
        return None, None, None, None
    cleaned_url, token = split_anaconda_token(url)
    url_parts = urlparse(cleaned_url)
    remainder_url = Url(
        hostname=url_parts.hostname,
        port=url_parts.port,
        path=url_parts.path,
        query=url_parts.query,
    )

    return str(remainder_url), url_parts.scheme, url_parts.auth, token


def split_conda_url_easy_parts(known_subdirs, url):
    # scheme, auth, token, platform, package_filename, host, port, path, query
    cleaned_url, token = split_anaconda_token(url)
    cleaned_url, platform = split_platform(known_subdirs, cleaned_url)
    _, ext = strip_pkg_extension(cleaned_url)
    cleaned_url, package_filename = (
        cleaned_url.rsplit("/", 1)
        if ext and "/" in cleaned_url
        else (cleaned_url, None)
    )

    # TODO: split out namespace using regex
    url_parts = urlparse(cleaned_url)

    return (
        url_parts.scheme,
        url_parts.auth,
        token,
        platform,
        package_filename,
        url_parts.hostname,
        url_parts.port,
        url_parts.path,
        url_parts.query,
    )


@lru_cache(maxsize=None)
def get_proxy_username_and_pass(scheme):
    username = input(f"\n{scheme} proxy username: ")
    passwd = getpass("Password: ")
    return username, passwd


def add_username_and_password(url: str, username: str, password: str) -> str:
    """
    Inserts `username` and `password` into provided `url`

    >>> add_username_and_password('https://anaconda.org', 'TestUser', 'Password')
    'https://TestUser:Password@anaconda.org'
    """
    url = urlparse(url)
    url_with_auth = url.replace(username=username, password=quote(password, safe=""))
    return str(url_with_auth)


def maybe_add_auth(url: str, auth: str, force=False) -> str:
    """Add auth if the url doesn't currently have it.

    By default, does not replace auth if it already exists.  Setting ``force`` to ``True``
    overrides this behavior.

    Examples:
        >>> maybe_add_auth("https://www.conda.io", "user:passwd")
        'https://user:passwd@www.conda.io'
        >>> maybe_add_auth("https://www.conda.io", "")
        'https://www.conda.io'
    """
    if not auth:
        return url

    url_parts = urlparse(url)
    if url_parts.username and url_parts.password and not force:
        return url

    auth_parts = auth.split(":")
    if len(auth_parts) > 1:
        url_parts = url_parts.replace(username=auth_parts[0], password=auth_parts[1])

    return str(url_parts)


def maybe_unquote(url):
    return unquote_plus(remove_auth(url)) if url else url


def remove_auth(url: str) -> str:
    """Remove embedded authentication from URL.

    .. code-block:: pycon

       >>> remove_auth("https://user:password@anaconda.com")
       'https://anaconda.com'
    """
    url = urlparse(url)
    url_no_auth = url.replace(username="", password="")

    return str(url_no_auth)