"""
URL utils
"""


import re
import sys
from urllib.parse import urlparse, urlunparse

import salt.utils.data
import salt.utils.path
import salt.utils.platform
import salt.utils.versions


def parse(url):
    """
    Parse a salt:// URL; return the path and a possible saltenv query.
    """
    if not url.startswith("salt://"):
        return url, None

    # urlparse will split on valid filename chars such as '?' and '&'
    resource = url.split("salt://", 1)[-1]

    if "?env=" in resource:
        # "env" is not supported; Use "saltenv".
        path, saltenv = resource.split("?env=", 1)[0], None
    elif "?saltenv=" in resource:
        path, saltenv = resource.split("?saltenv=", 1)
    else:
        path, saltenv = resource, None

    if salt.utils.platform.is_windows():
        path = salt.utils.path.sanitize_win_path(path)

    return path, saltenv


def create(path, saltenv=None):
    """
    join `path` and `saltenv` into a 'salt://' URL.
    """
    if salt.utils.platform.is_windows():
        path = salt.utils.path.sanitize_win_path(path)
    path = salt.utils.data.decode(path)

    query = "saltenv={}".format(saltenv) if saltenv else ""
    url = salt.utils.data.decode(urlunparse(("file", "", path, "", query, "")))
    return "salt://{}".format(url[len("file:///") :])


def is_escaped(url):
    """
    test whether `url` is escaped with `|`
    """
    scheme = urlparse(url).scheme
    if not scheme:
        return url.startswith("|")
    elif scheme == "salt":
        path, saltenv = parse(url)
        if salt.utils.platform.is_windows() and "|" in url:
            return path.startswith("_")
        else:
            return path.startswith("|")
    else:
        return False


def escape(url):
    """
    add escape character `|` to `url`
    """
    if salt.utils.platform.is_windows():
        return url

    scheme = urlparse(url).scheme
    if not scheme:
        if url.startswith("|"):
            return url
        else:
            return "|{}".format(url)
    elif scheme == "salt":
        path, saltenv = parse(url)
        if path.startswith("|"):
            return create(path, saltenv)
        else:
            return create("|{}".format(path), saltenv)
    else:
        return url


def unescape(url):
    """
    remove escape character `|` from `url`
    """
    scheme = urlparse(url).scheme
    if not scheme:
        return url.lstrip("|")
    elif scheme == "salt":
        path, saltenv = parse(url)
        if salt.utils.platform.is_windows() and "|" in url:
            return create(path.lstrip("_"), saltenv)
        else:
            return create(path.lstrip("|"), saltenv)
    else:
        return url


def add_env(url, saltenv):
    """
    append `saltenv` to `url` as a query parameter to a 'salt://' url
    """
    if not url.startswith("salt://"):
        return url

    path, senv = parse(url)
    return create(path, saltenv)


def split_env(url):
    """
    remove the saltenv query parameter from a 'salt://' url
    """
    if not url.startswith("salt://"):
        return url, None

    path, senv = parse(url)
    return create(path), senv


def validate(url, protos):
    """
    Return true if the passed URL scheme is in the list of accepted protos
    """
    if urlparse(url).scheme in protos:
        return True
    return False


def strip_proto(url):
    """
    Return a copy of the string with the protocol designation stripped, if one
    was present.
    """
    return re.sub("^[^:/]+://", "", url)


def add_http_basic_auth(url, user=None, password=None, https_only=False):
    """
    Return a string with http basic auth incorporated into it
    """
    if user is None and password is None:
        return url
    else:
        urltuple = urlparse(url)
        if https_only and urltuple.scheme != "https":
            raise ValueError("Basic Auth only supported for HTTPS")
        if password is None:
            netloc = "{}@{}".format(user, urltuple.netloc)
            urltuple = urltuple._replace(netloc=netloc)
            return urlunparse(urltuple)
        else:
            netloc = "{}:{}@{}".format(user, password, urltuple.netloc)
            urltuple = urltuple._replace(netloc=netloc)
            return urlunparse(urltuple)


def redact_http_basic_auth(output):
    """
    Remove HTTP user and password
    """
    # We can't use re.compile because re.compile(someregex).sub() doesn't
    # support flags even in Python 2.7.
    url_re = "(https?)://.*@"
    redacted = r"\1://<redacted>@"
    if sys.version_info >= (2, 7):
        # re.sub() supports flags as of 2.7, use this to do a case-insensitive
        # match.
        return re.sub(url_re, redacted, output, flags=re.IGNORECASE)
    else:
        # We're on python 2.6, test if a lowercased version of the output
        # string matches the regex...
        if re.search(url_re, output.lower()):
            # ... and if it does, perform the regex substitution.
            return re.sub(url_re, redacted, output.lower())
    # No match, just return the original string
    return output
