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"""Query expansion strategies."""

from abc import ABC, abstractmethod
from typing import List


class QueryExpander(ABC):
    """Base query expander interface."""

    @abstractmethod
    async def expand(self, query: str) -> List[str]:
        """Expand query into multiple variations."""
        pass


class NoOpExpander(QueryExpander):
    """No-op expander - returns original query only."""

    async def expand(self, query: str) -> List[str]:
        """Return original query without expansion."""
        return [query]


# Future: LLMQueryExpander
# class LLMQueryExpander(QueryExpander):
#     """Expand query using LLM to generate variations."""
#     pass