from __future__ import annotations


from scripts.defextra_markers import normalize_doi, normalize_paper_id

PDF_ALIAS_MAP: dict[str, list[str]] = {
    # Info Processing & Management DOI mapped to Elsevier PII stems.
    "10.1016/j.ipm.2021.102505": [
        "S0306457321000157",
        "1-s2.0-S0306457321000157-main",
        "S0957417423021437",
        "1-s2.0-S0957417423021437-main",
    ],
    "j.ipm.2021.102505": [
        "S0306457321000157",
        "1-s2.0-S0306457321000157-main",
        "S0957417423021437",
        "1-s2.0-S0957417423021437-main",
    ],
    "dx.doi.org/https://doi.org/10.1016/j.ipm.2021.102505": [
        "S0306457321000157",
        "1-s2.0-S0306457321000157-main",
        "S0957417423021437",
        "1-s2.0-S0957417423021437-main",
    ],
}


def candidate_pdf_aliases(
    paper_id: str,
    doi: str,
    arxiv: str,
) -> list[str]:
    keys = {
        (paper_id or "").strip(),
        normalize_paper_id(paper_id or ""),
        (doi or "").strip(),
        normalize_doi(doi or ""),
        (arxiv or "").strip(),
    }
    aliases: list[str] = []
    for key in keys:
        if not key:
            continue
        aliases.extend(PDF_ALIAS_MAP.get(key, []))
    return aliases