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#
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from __future__ import annotations

from typing import Any

from airflow.partition_mappers.base import PartitionMapper


class AllowedKeyMapper(PartitionMapper):
    """Partition mapper that validates keys against a set of allowed keys."""

    def __init__(self, allowed_keys: list[str], *, max_downstream_keys: int | None = None) -> None:
        super().__init__(max_downstream_keys=max_downstream_keys)
        self.allowed_keys = allowed_keys

    def to_downstream(self, key: str) -> str:
        if key not in self.allowed_keys:
            raise ValueError(f"Key {key!r} not in allowed keys {self.allowed_keys}")
        return key

    def serialize(self) -> dict[str, Any]:
        data: dict[str, Any] = {"allowed_keys": self.allowed_keys}
        if self.max_downstream_keys is not None:
            data["max_downstream_keys"] = self.max_downstream_keys
        return data

    @classmethod
    def deserialize(cls, data: dict[str, Any]) -> PartitionMapper:
        return cls(allowed_keys=data["allowed_keys"], max_downstream_keys=data.get("max_downstream_keys"))
