"""Which documents an analysis may use — the one definition (U-D3).

Go materialises the analysis-scope catalog from `analyses.data_bind`; every bound
pdf/docx/txt appears there as a source with `source_type="unstructured"` and
`source_id = documents.id` (`catalog/service.go::buildBoundSource`, verified
2026-09-23). This reads that row. It is the scope for document retrieval
(`unstructured_flow` and `retrieve_knowledge`) and the binding check for the
image-token endpoint.

**No scope row → no documents.** Decided with Rifqi 2026-09-23 to match the
code's existing behaviour for `structured_flow` and `check`
(`AnalysisScopedCatalogReader.read`, no user-scope fallback since 2026-07-13):
Go writes the row whenever anything is bound, so a miss means "nothing bound"
or a Go failure, and answering from unbound documents is the misleading-source
bug that change fixed. A failed read degrades the same way, logged.
"""

from __future__ import annotations

from typing import Any

from src.middlewares.logging import get_logger

logger = get_logger("document_scope")


async def bound_documents(
    user_id: str, analysis_id: str | None, store: Any = None
) -> list[tuple[str, str]]:
    """(document_id, display name) for every document bound to the analysis.

    Never raises. Empty when there is no analysis id, no scope row, or the read
    failed (the last is logged with `degraded_seam`).
    """
    if not analysis_id:
        return []
    if store is None:
        from src.catalog.store import CatalogStore

        store = CatalogStore()
    try:
        catalog = await store.get_by_analysis(analysis_id, user_id)
    except Exception as e:
        logger.warning(
            "document scope read failed — no documents in scope",
            analysis_id=analysis_id,
            error=repr(e),
            degraded_seam="document_scope",
        )
        return []
    if catalog is None:
        logger.info("no analysis scope row — no documents in scope", analysis_id=analysis_id)
        return []
    return [
        (s.source_id, s.name)
        for s in catalog.sources
        if s.source_type == "unstructured"
    ]


async def bound_document_ids(
    user_id: str, analysis_id: str | None, store: Any = None
) -> list[str]:
    return [doc_id for doc_id, _ in await bound_documents(user_id, analysis_id, store)]