"""Implement infrastructure support for dense retriever."""

from __future__ import annotations

from app.domain.retrieval import EmbeddingProvider, RetrievalQuery, Retriever, RetrievedChunk, VectorIndex
# Keep adapter behavior explicit so integration details remain easy to audit.



class DenseRetriever(Retriever):
    """Provide the Dense Retriever retriever."""
    def __init__(self, *, embedding_provider: EmbeddingProvider, vector_index: VectorIndex) -> None:
        """Initialize the Dense Retriever instance."""
        self.embedding_provider = embedding_provider
        self.vector_index = vector_index

    def retrieve(self, query: RetrievalQuery) -> list[RetrievedChunk]:
        """Handle retrieve for the Dense Retriever instance."""
        query_vector = self.embedding_provider.embed_query(query.query)
        return self.vector_index.search(query_vector, query.top_k, query.filters)

    def search(self, query: str, top_k: int, filters: str | None = None) -> list[RetrievedChunk]:
        """Handle search for the Dense Retriever instance."""
        return self.retrieve(RetrievalQuery(query=query, top_k=top_k, filters=filters))