"""openai/math preprint'lerinin LaTeX kaynaklarını tek dosyaya açıp parquet üretir.

PDF'ler OCR'lanmaz: her makalenin `build/` altındaki kaynağı kullanılır. Kök .tex
dosyasındaki `\\input` ve `\\lstinputlisting` çağrıları içerikle değiştirilir, yorumlar
atılır; `\\includepdf` ile birleştirilen alt belgeler sırayla eklenir. Aile, konu ve
özet bilgileri `CONTENTS.md` ile `overview.tex` dosyalarından alınır.

    python3 build_papers.py   # -> data/papers.parquet, data/overview.parquet
"""
import re
import subprocess
from pathlib import Path

import fitz  # PyMuPDF; yalnız sayfa sayısı için
import pandas as pd

REPO = "openai/math"
COMMIT = "adc7f1241b42e322a6451854ab7e4b4c146bf78a"
BLOB = f"https://github.com/{REPO}/blob/{COMMIT}/"
SPARSE = ["/preprints/", "/reasoning_traces/", "/overview.*", "/CONTENTS.md", "/README.md", "/LICENSE"]

HERE = Path(__file__).parent
SRC = HERE / "raw" / "math"
OUT = HERE / "data"

# `(?<!\\)`: `\\input 1` (satır sonu + metin) komut değildir.
INPUT_RE = re.compile(r"(?<!\\)\\input(?:\s*\{([^}]*)\}|\s+([^\s{}\\]+))")
LST_RE = re.compile(r"(?<!\\)\\lstinputlisting\s*(\[[^\]]*\])?\s*\{([^}]*)\}")
INCLUDEPDF_RE = re.compile(r"(?<!\\)\\includepdf\s*(?:\[[^\]]*(?:\{[^}]*\}[^\]]*)*\])?\s*\{([^}]*)\}")
BIB_RE = re.compile(r"(?<!\\)\\bibliography\s*\{([^}]*)\}")
# pdfTeX'in kendi dosyaları; kaynakta yoktur, olduğu gibi bırakılır.
TEX_SYSTEM_INPUTS = {"glyphtounicode", "glyphtounicode-cmex", "glyphtounicode-cmr"}
BEGIN_DOC_RE = re.compile(r"^[^%\n]*\\begin\{document\}", re.M)
DATE_RE = re.compile(r"-((?:January|February|March|April|May|June|July|August|September|October|November|December)-\d{1,2}-\d{4}|\d{4}-\d{2}-\d{2})$")


def fetch_source():
    """Pinned commit'i Lean dosyaları olmadan klonlar (önbellek varsa atlar)."""
    if (SRC / "CONTENTS.md").exists():
        head = subprocess.run(["git", "rev-parse", "HEAD"], cwd=SRC, capture_output=True, text=True).stdout.strip()
        if head != COMMIT:
            raise SystemExit(f"{SRC} commit {head}, beklenen {COMMIT}")
        return
    SRC.parent.mkdir(parents=True, exist_ok=True)
    subprocess.run(["git", "clone", "-q", "--filter=blob:none", "--no-checkout",
                    f"https://github.com/{REPO}.git", str(SRC)], check=True)
    subprocess.run(["git", "sparse-checkout", "set", "--no-cone", *SPARSE], cwd=SRC, check=True)
    subprocess.run(["git", "checkout", "-q", COMMIT], cwd=SRC, check=True)


VERBATIM_BEGIN = re.compile(r"\\begin\{(verbatim\*?|Verbatim|lstlisting|minted)\}")


def strip_comments(tex: str) -> str:
    """`%` yorumlarını atar; tamamı yorum olan satırlar silinir, verbatim ortamlarına dokunulmaz."""
    out, verb = [], None
    for line in tex.split("\n"):
        if verb:
            out.append(line)
            if f"\\end{{{verb}}}" in line:
                verb = None
            continue
        i = 0
        while True:
            i = line.find("%", i)
            if i < 0:
                kept = line
                break
            backslashes = len(line[:i]) - len(line[:i].rstrip("\\"))
            if backslashes % 2 == 0:
                kept = line[:i].rstrip() if line[:i].strip() else None
                break
            i += 1
        if kept is None:
            continue
        out.append(kept)
        m = VERBATIM_BEGIN.search(kept)
        if m and f"\\end{{{m.group(1)}}}" not in kept[m.end():]:
            verb = m.group(1)
    return "\n".join(out)


def resolve(name: str, cur: Path, root: Path, exts=(".tex", "")):
    for base in (root, cur):
        for ext in exts:
            p = base / (name + ext)
            if p.is_file():
                return p
    return None


def flatten(path: Path, root: Path, pkg: Path, missing: list, seen=()) -> str:
    """`root`: \\input yollarının göreli olduğu dizin; `pkg`: makalenin preprints/ dizini."""
    if path in seen:
        raise RuntimeError(f"döngüsel input: {path}")
    tex = strip_comments(path.read_text(encoding="utf-8", errors="replace"))
    cur = path.parent

    def sub_input(m):
        name = (m.group(1) or m.group(2)).strip()
        if re.sub(r"\.tex$", "", name) in TEX_SYSTEM_INPUTS:
            return m.group(0)
        p = resolve(name, cur, root)
        if p is None:
            missing.append(name)
            return m.group(0)
        return flatten(p, root, pkg, missing, seen + (path,)).strip("\n")

    def sub_lst(m):
        name = m.group(2).strip()
        p = resolve(name, cur, root, exts=("",))
        if p is None:
            # Yayında dizin adı değişmiş olabilir (certificate/ -> verification/): tek eşleşen ada düş.
            hits = list(pkg.rglob(Path(name).name))
            p = hits[0] if len(hits) == 1 else None
        if p is None:
            missing.append(name)
            return m.group(0)
        code = p.read_text(encoding="utf-8", errors="replace").rstrip("\n")
        return f"\\begin{{lstlisting}}{m.group(1) or ''}\n{code}\n\\end{{lstlisting}}"

    tex = LST_RE.sub(sub_lst, tex)
    return INPUT_RE.sub(sub_input, tex)


def flatten_paper(root: Path, pkg: Path, missing: list) -> str:
    """Kök yalnız `\\includepdf` ile ayrı belgeleri birleştiriyorsa, o belgeleri sırayla açar.

    Sarmalayıcı kök derlenmiş PDF'leri iliştirir; metin alt belgelerin kaynağındadır.
    """
    parts = INCLUDEPDF_RE.findall(strip_comments(root.read_text(encoding="utf-8", errors="replace")))
    if not parts:
        return collapse(flatten(root, root.parent, pkg, missing))
    docs = []
    for name in parts:
        p = resolve(re.sub(r"\.pdf$", "", name.strip()), root.parent, root.parent, exts=(".tex",))
        if p is None:
            missing.append(name)
            continue
        docs.append(collapse(flatten(p, root.parent, pkg, missing)))
    return "\n".join(docs)


def collapse(tex: str) -> str:
    tex = "\n".join(line.rstrip() for line in tex.split("\n"))
    return re.sub(r"\n{3,}", "\n\n", tex).strip() + "\n"


def find_root(d: Path, pdf: Path) -> Path:
    """`\\begin{document}` içeren .tex; birden fazlaysa PDF adıyla ya da main ile eşleşen en sığ dosya.

    `\\documentclass` aranmaz: bazı makalelerde o satır `\\input` edilen preamble dosyasında.
    """
    roots = [p for p in d.rglob("*.tex") if BEGIN_DOC_RE.search(p.read_text(encoding="utf-8", errors="replace"))]
    if len(roots) == 1:
        return roots[0]
    for key in (pdf.stem, "main"):
        hit = sorted((p for p in roots if p.stem == key), key=lambda p: len(p.parts))
        if len(hit) == 1 or len(hit) > 1 and len(hit[0].parts) < len(hit[1].parts):
            return hit[0]
    raise RuntimeError(f"kök .tex belirsiz: {d.name}: {roots}")


def bib_text(tex: str, root: Path) -> str:
    parts = []
    for m in BIB_RE.finditer(tex):
        for name in m.group(1).split(","):
            p = resolve(name.strip(), root, root, exts=(".bib", ""))
            if p is not None:
                parts.append(p.read_text(encoding="utf-8", errors="replace").strip())
    return "\n\n".join(parts) or None


def md_inline(s: str) -> str:
    """CONTENTS.md'deki HTML/GitHub-math işaretlerini sade Markdown+LaTeX'e çevirir."""
    s = re.sub(r"\$`(.*?)`\$", r"$\1$", s)
    s = re.sub(r"</?i>", "*", s)
    s = re.sub(r"</?b>", "**", s)
    s = re.sub(r"</?sub>|</?sup>", "", s)
    for a, b in (("&gt;", ">"), ("&lt;", "<"), ("&amp;", "&"), ("&emsp;", ""), ("&nbsp;", " ")):
        s = s.replace(a, b)
    s = s.replace("\\gt", ">").replace("\\lt", "<")
    return s.strip()


def parse_contents(text: str) -> dict:
    """pdf yolu -> {family, family_title, family_summary, title, abstract, lean_doc}."""
    cells = re.findall(r"<td>\n\n(.*?)\n\n</td>", text, re.S)
    fam = None
    out = {}
    for cell in cells:
        m = re.match(r"\*\*(\d{3})\. (.*?)\*\* (.*)", cell, re.S)
        if m:
            summary = m.group(3)
            lean = re.search(r"\(\[Lean\]\((lean/docs/\d+\.md)\)\)", summary)
            summary = re.sub(r"\s*\(\[Lean\]\([^)]*\)\)", "", summary)
            fam = {"family": m.group(1), "family_title": md_inline(m.group(2)).rstrip("."),
                   "family_summary": md_inline(summary), "lean_doc": lean.group(1) if lean else None}
            continue
        m = re.match(r"&emsp;\[(.*)\]\((preprints/[^\n]+?\.pdf)\)([^\n]*)\n\n(.*)", cell, re.S)
        if not m:
            raise RuntimeError(f"tanınmayan hücre: {cell[:120]}")
        note = m.group(3).strip(" —") or None
        out[m.group(2)] = dict(fam, title=md_inline(m.group(1)), note=note, abstract=md_inline(m.group(4)))
    return out


def parse_subjects(tex: str) -> dict:
    subj, out = None, {}
    for m in re.finditer(r"\\cataloguesection\{([^}]*)\}|\\resultentry\{(\d{3})\}", tex):
        if m.group(1):
            subj = m.group(1)
        else:
            out[m.group(2)] = subj
    return out


def parse_date(name: str):
    m = DATE_RE.search(name)
    if not m:
        return None
    fmt = "%Y-%m-%d" if m.group(1)[0].isdigit() else "%B-%d-%Y"
    return pd.to_datetime(m.group(1), format=fmt).date().isoformat()


def main():
    fetch_source()
    contents = parse_contents((SRC / "CONTENTS.md").read_text(encoding="utf-8"))
    subjects = parse_subjects((SRC / "overview.tex").read_text(encoding="utf-8"))
    rows, problems = [], []
    for pdf_rel, meta in contents.items():
        pdf = SRC / pdf_rel
        d = pdf.parent
        root = find_root(d, pdf)
        missing = []
        latex = flatten_paper(root, d, missing)
        if missing:
            problems.append((d.name, missing))
        for needle in ("\\documentclass", "\\begin{document}", "\\end{document}"):
            if needle not in latex:
                problems.append((d.name, [f"{needle} yok"]))
        with fitz.open(pdf) as doc:
            num_pages = doc.page_count
        rows.append({
            "id": d.name,
            "family": meta["family"],
            "subject": subjects[meta["family"]],
            "family_title": meta["family_title"],
            "family_summary": meta["family_summary"],
            "title": meta["title"],
            "note": meta["note"],
            "abstract": meta["abstract"],
            "date": parse_date(d.name),
            "latex": latex,
            "bib": bib_text(latex, root.parent),
            "num_pages": num_pages,
            "has_lean": meta["lean_doc"] is not None,
            "pdf_url": BLOB + pdf_rel,
            "source_dir_url": BLOB.replace("/blob/", "/tree/") + str(root.parent.relative_to(SRC)),
        })
    OUT.mkdir(exist_ok=True)
    df = pd.DataFrame(rows).sort_values(["family", "id"]).reset_index(drop=True)
    df.to_parquet(OUT / "papers.parquet", index=False)

    overview = collapse(strip_comments((SRC / "overview.tex").read_text(encoding="utf-8")))
    pd.DataFrame([{"latex": overview, "pdf_url": BLOB + "overview.pdf"}]).to_parquet(OUT / "overview.parquet", index=False)

    print(f"{len(df)} makale, {df.family.nunique()} aile, {df.subject.nunique()} konu")
    for name, miss in problems:
        print("ÇÖZÜLEMEYEN:", name, miss)


if __name__ == "__main__":
    main()