# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.
from typing import Any, Optional, Union
from urllib.parse import urlparse

from marshmallow import validate, ValidationError

from superset.utils import json

ALLOWED_URL_SCHEMES = frozenset({"http", "https"})


class OneOfCaseInsensitive(validate.OneOf):
    """
    Marshmallow validator that's based on the built-in `OneOf`, but performs
    validation case insensitively.
    """

    def __call__(self, value: Any) -> str:
        try:
            if (value.lower() if isinstance(value, str) else value) not in [
                choice.lower() if isinstance(choice, str) else choice
                for choice in self.choices
            ]:
                raise ValidationError(self._format_error(value))
        except TypeError as error:
            raise ValidationError(self._format_error(value)) from error

        return value


def validate_json(value: Union[bytes, bytearray, str]) -> None:
    """
    JSON Validator that can be passed to a Marshmallow `Field`'s validate argument.

    :raises ValidationError: if value is not serializable to JSON
    :param value: an object that should be parseable to JSON
    """
    try:
        json.validate_json(value)
    except json.JSONDecodeError as ex:
        raise ValidationError("JSON not valid") from ex


def validate_external_url(value: Optional[str]) -> None:
    """
    Validator for externally managed object URLs.

    Restricts the accepted URL schemes to ``http`` and ``https`` so that
    other schemes (for example ``javascript:``, ``data:`` or ``vbscript:``)
    cannot be stored and later rendered by clients. The URL must also be
    absolute (include a network location/host) so that malformed values such
    as ``https:foo`` are rejected. Empty values are allowed since the field is
    optional.

    :param value: the URL to validate
    :raises ValidationError: if the value uses a disallowed scheme or is not
        an absolute URL
    """
    if not value:
        return

    parsed = urlparse(value)
    scheme = parsed.scheme.lower()
    if scheme not in ALLOWED_URL_SCHEMES:
        raise ValidationError(
            "URL must use one of the following schemes: "
            f"{', '.join(sorted(ALLOWED_URL_SCHEMES))}."
        )
    if not parsed.netloc:
        raise ValidationError("URL must be absolute and include a host.")