"""
Knowledge Universe — Base Format Adapter
Abstract contract all adapters must satisfy.
"""

from abc import ABC, abstractmethod
from typing import Any
from src.api.models import Source


class BaseFormatAdapter(ABC):
    """
    Abstract base class for all output format adapters.

    The adapter pattern means the core pipeline never changes —
    only the output representation does.
    """

    @abstractmethod
    def transform(self, source: Source) -> Any:
        """Transform source model to target output format."""
        pass

    def transform_many(self, sources: list) -> list:
        """Transform multiple sources. Override for batch optimization."""
        return [self.transform(s) for s in sources]