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from __future__ import annotations

from typing import Any, Dict, Literal

from paper2lab.inference.nemotron_refiner import refine_with_nemotron


RefinementMode = Literal["none", "local", "nemotron"]


def refine_optional(
    paper_card: Dict[str, Any],
    mode: RefinementMode = "none",
    return_comparison: bool = True,
) -> Dict[str, Any]:
    """
    none/local: keep local rule-based extraction.
    nemotron: refine the candidate with Nemotron.
    """

    mode = (mode or "none").lower().strip()

    if mode in {"none", "local"}:
        return {
            "status": "skipped",
            "mode": mode,
            "before_refinement": paper_card,
            "after_refinement": paper_card,
            "diff_summary": {
                "changed_fields": [],
                "added_fields": [],
                "removed_fields": [],
            },
        }

    if mode == "nemotron":
        pack = paper_card.get("llm_evidence_pack")

        if not pack:
            return {
                "status": "error",
                "mode": "nemotron",
                "error": "Missing llm_evidence_pack in paper_card.",
                "before_refinement": paper_card,
                "after_refinement": paper_card,
                "diff_summary": {
                    "changed_fields": [],
                    "added_fields": [],
                    "removed_fields": [],
                },
            }

        try:
            return refine_with_nemotron(
                llm_evidence_pack=pack,
                return_comparison=return_comparison,
            )
        except Exception as exc:
            return {
                "status": "error",
                "mode": "nemotron",
                "error": str(exc),
                "before_refinement": paper_card,
                "after_refinement": paper_card,
                "diff_summary": {
                    "changed_fields": [],
                    "added_fields": [],
                    "removed_fields": [],
                },
            }

    return {
        "status": "error",
        "mode": mode,
        "error": f"Unsupported refinement mode: {mode}",
        "before_refinement": paper_card,
        "after_refinement": paper_card,
        "diff_summary": {
            "changed_fields": [],
            "added_fields": [],
            "removed_fields": [],
        },
    }