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# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
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#
#   http://www.apache.org/licenses/LICENSE-2.0
#
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from __future__ import annotations

import warnings
from typing import TYPE_CHECKING, Any

import attrs

from airflow.datasets import DatasetAlias, extract_event_key

if TYPE_CHECKING:
    from airflow.datasets import Dataset


@attrs.define(init=False)
class Metadata:
    """Metadata to attach to a DatasetEvent."""

    uri: str
    extra: dict[str, Any]
    alias_name: str | None = None

    def __init__(
        self, target: str | Dataset, extra: dict[str, Any], alias: DatasetAlias | str | None = None
    ) -> None:
        if isinstance(target, str):
            warnings.warn(
                (
                    "Accessing outlet_events using string is deprecated and will be removed in Airflow 3. "
                    "Please use the Dataset or DatasetAlias object (renamed as Asset and AssetAlias in Airflow 3) directly"
                ),
                DeprecationWarning,
                stacklevel=2,
            )
        self.uri = extract_event_key(target)
        self.extra = extra
        if isinstance(alias, DatasetAlias):
            self.alias_name = alias.name
        else:
            warnings.warn(
                (
                    "Emitting dataset events using string is deprecated and will be removed in Airflow 3. "
                    "Please use the Dataset object (renamed as Asset in Airflow 3) directly"
                ),
                DeprecationWarning,
                stacklevel=2,
            )
            self.alias_name = alias