#!/usr/bin/env python3
"""Regenerate references.bib from paper-note frontmatter.

The paper notes are the single source of truth; the .bib file is a generated
view (like the syntheses). Run from anywhere after adding or editing a paper:

    python3 _scripts/make_bib.py

Entry type is derived from `status`: journal -> @article,
accepted/workshop -> @inproceedings, preprint -> @misc (arXiv eprint).
Venue annotations in parentheses are stripped for the booktitle/journal field.
"""
import glob
import os
import re

VAULT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))


def field(fm: str, name: str) -> str:
    m = re.search(rf"^{name}: (.*)$", fm, flags=re.M)
    return m.group(1).strip().strip('"') if m else ""


def main() -> None:
    entries = []
    for path in sorted(glob.glob(os.path.join(VAULT, "papers", "*.md")) + glob.glob(os.path.join(VAULT, "influences", "*.md"))):
        text = open(path, encoding="utf-8").read()
        parts = text.split("---")
        if len(parts) < 3:
            print(f"WARN no frontmatter: {path}")
            continue
        fm = parts[1]

        stem = os.path.splitext(os.path.basename(path))[0]
        citekey = (field(fm, "citekey") or stem).split("#")[0].strip() or stem
        title = field(fm, "title")
        year = field(fm, "year")
        status = field(fm, "status")
        arxiv = field(fm, "arxiv")
        # keep the primary venue only: drop provenance notes after ";" and
        # trailing parentheticals (poster/oral/decision annotations)
        venue = field(fm, "venue").split(";")[0].strip()
        venue = re.sub(r"\s*\([^)]*\)$", "", venue).strip()

        raw_authors = field(fm, "authors")
        names = re.findall(r"\[\[(.+?)\]\]", raw_authors)
        if not names:
            names = [n.strip() for n in raw_authors.strip("[]").split(",") if n.strip()]
        authors = " and ".join(names)

        lines = [f"  title = {{{title}}}", f"  author = {{{authors}}}", f"  year = {{{year}}}"]
        if status == "journal":
            kind = "article"
            lines.append(f"  journal = {{{venue}}}")
        elif status in ("accepted", "workshop"):
            kind = "inproceedings"
            lines.append(f"  booktitle = {{{venue}}}")
        else:
            kind = "misc"
        if arxiv:
            lines += [f"  eprint = {{{arxiv}}}", "  archivePrefix = {arXiv}"]
        entries.append(f"@{kind}{{{citekey},\n" + ",\n".join(lines) + "\n}")

    out = os.path.join(VAULT, "references.bib")
    with open(out, "w", encoding="utf-8") as f:
        f.write("% Generated by _scripts/make_bib.py — do not edit by hand.\n")
        f.write("% Source of truth: papers/*.md frontmatter.\n\n")
        f.write("\n\n".join(entries) + "\n")
    print(f"wrote {len(entries)} entries to {out}")


if __name__ == "__main__":
    main()