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# 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 __future__ import annotations

from typing import Any
from urllib.parse import urlparse

import attr


@attr.define()
class Dataset:
    """A Dataset is used for marking data dependencies between workflows."""

    uri: str = attr.field(validator=[attr.validators.min_len(1), attr.validators.max_len(3000)])
    extra: dict[str, Any] | None = None

    @uri.validator
    def _check_uri(self, attr, uri: str):
        if uri.isspace():
            raise ValueError(f'{attr.name} cannot be just whitespace')
        try:
            uri.encode('ascii')
        except UnicodeEncodeError:
            raise ValueError(f'{attr.name!r} must be ascii')
        parsed = urlparse(uri)
        if parsed.scheme and parsed.scheme.lower() == 'airflow':
            raise ValueError(f'{attr.name!r} scheme `airflow` is reserved')
