"""Runtime Evidence lookup bound to the atomically active corpus generation."""

from tht.corpus.store import CorpusStore


def active_evidence_hits(store: CorpusStore, vector_store, embedding, *, limit: int):
    manifest = store.active_manifest()
    if manifest is None or manifest.vector_generation is None:
        return []
    document_generations = dict(manifest.metadata.get("document_generations", {}))
    active_documents = {document.document_id for document in manifest.documents}
    hits = vector_store.search(["evidence"], embedding, limit=limit, kinds=["evidence"])
    return [
        hit for hit in hits
        if hit.metadata.get("document_id") in active_documents
        and hit.metadata.get("vector_generation")
        == document_generations.get(hit.metadata.get("document_id"), manifest.vector_generation)
    ]


def resolve_evidence_file(store: CorpusStore, evidence_id: str) -> str:
    manifest = store.active_manifest()
    if manifest is None:
        return ""
    for document in manifest.documents:
        frontmatter = document.metadata.get("frontmatter", {})
        identifiers = {document.document_id, document.source_id, str(frontmatter.get("id", ""))}
        if evidence_id in identifiers:
            path = store.resolve_document(document.document_id)
            return str(path) if path else ""
    return ""