#!/usr/bin/env python3
"""Fetch NIK (Supreme Audit Office) control reports into a SpeakLeash-style
.jsonl.zst for build_dynaword.py.

Official documents of Najwyższa Izba Kontroli ("Informacja o wynikach
kontroli"), outside copyright under art. 4 pkt 2 pr. aut., same legal basis
as the shipped dziennik_ustaw and sejm_interpellations shards. The audit
reports are PDF attachments on server-rendered control pages
(https://www.nik.gov.pl/kontrole/...); text is extracted with pypdf.

Record = one control report PDF (the "Informacja o wynikach kontroli" and
same-page attachments); page chrome lives in meta (nr ewidencyjny, date,
thematic field). Caveats (quoted third-party text inside official documents)
are recorded in the companion license-evidence file; PII scrubbing is
SlayerLab/NERGAL, not this repo.

Usage:
  python3 src/fetch_nik_control_reports_pl.py --out ~/speakleash
  python3 src/fetch_nik_control_reports_pl.py --out ~/speakleash --max-docs 20
"""
from __future__ import annotations
import argparse, gzip, html as htmllib, json, re, subprocess, sys, time
from multiprocessing import Pool
from pathlib import Path
from urllib.error import HTTPError, URLError
from urllib.parse import urljoin
from urllib.request import Request, urlopen

BASE = "https://www.nik.gov.pl"
LISTING = BASE + "/kontrole/wyniki-kontroli-nik/prosta/limit,50,strona,{}.html"
KEY = "nik_control_reports_pl"
UA = {"User-Agent": "polish-dynaword/0.1 (+research; openly-licensed corpus)",
      "Accept": "*/*"}
MIN_CHARS = 200
LICENSE = "public-domain (official documents)"
AUTHOR = "Najwyższa Izba Kontroli"

CTRL_RE = re.compile(r'href="([^"]*?/kontrole/[A-Z]{1,3}/\d{2}/\d{3}[^"]*)"')
PDF_RE = re.compile(r'href="([^"]*?/kontrole/[^"]*?pobierz[^"]*?\.pdf)"', re.I)
EWID_RE = re.compile(r"Nr ewidencyjny:\s*([A-Z]{1,3}/\d{2}/\d{3})")
DATE_RE = re.compile(r"Data publikacji:\s*([\d. :]+)")
FIELD_RE = re.compile(r"Dział tematyczny:\s*([^<]+)")
TITLE_RE = re.compile(r"<h1[^>]*>(.*?)</h1>", re.S)
TAG_RE = re.compile(r"<[^>]+>")

# The results listing is a JS pager (all /strona,N URLs return page 1; no
# sitemap). Controls carry official sequential record numbers (Nr ewidencyjny
# P|D|I/RR/NNN), so the inventory sweeps that numbering with a gap tolerance
# and probes only public detail pages, politely and serially.
PREFIXES = ("P", "D", "I", "G", "K", "N", "S", "R", "A", "Z")
YEARS = range(2004, 2027)
MAX_GAP = 80


def _get(url: str, retries: int = 5):
    import http.client
    for attempt in range(retries):
        try:
            with urlopen(Request(url, headers=UA), timeout=90) as r:
                return r.read()
        except HTTPError as e:
            if e.code in (403, 404, 410):  # permanent answers are misses, not retries
                return None
            if attempt == retries - 1:
                return None
            time.sleep(2 * (attempt + 1))
        except (URLError, TimeoutError, http.client.HTTPException,
                ConnectionError, OSError):
            if attempt == retries - 1:
                return None
            time.sleep(2 * (attempt + 1))


def pdf_to_text(blob: bytes) -> str:
    import io

    import pypdf
    reader = pypdf.PdfReader(io.BytesIO(blob))
    parts = []
    for page in reader.pages:
        parts.append(page.extract_text() or "")
    return "\n".join(parts)


def parse_control_page(url: str, html_src: str):
    """Control page -> (meta dict, list of PDF urls)."""
    def clean(x):
        return " ".join(htmllib.unescape(TAG_RE.sub("", x)).split())
    m = EWID_RE.search(html_src)
    d = DATE_RE.search(html_src)
    f = FIELD_RE.search(html_src)
    t = TITLE_RE.search(html_src)
    meta = {
        "control_id": clean(m.group(1)) if m else "",
        "published": clean(d.group(1)).split()[0].replace(".", "-") if d else "",
        "field": clean(f.group(1)) if f else "",
        "title": clean(t.group(1)) if t else "",
        "source_url": url,
    }
    pdfs = [urljoin(BASE, u.replace("&amp;", "&")) for u in PDF_RE.findall(html_src)]
    return meta, sorted(set(pdfs))


def _inventory_block(task):
    """Sweep one (prefix, year) block serially; ends after MAX_GAP misses."""
    pref, yy, delay = task
    yy2 = str(yy)[2:]
    rows, miss, found = [], 0, 0
    n = 1
    while miss < MAX_GAP:
        url = f"{BASE}/kontrole/{pref}/{yy2}/{n:03d}"
        raw = _get(url)  # None on any fetch failure = miss, never raises
        n += 1
        if raw and b"Nr ewidencyjny" in raw:
            rows.append({"control_url": url})
            found += 1
            miss = 0
        else:
            miss += 1
        if delay:
            time.sleep(delay)
    return pref, yy2, found, rows


def inventory(out_dir: Path, delay: float, workers: int = 3):
    """Sweep official record numbers (Nr ewidencyjny) over public detail pages.

    The results listing is a JS pager, so the inventory walks the official
    sequential numbering instead: blocks of (prefix, year), each block serial
    and polite, a few blocks in parallel. Completed blocks are journaled to
    inventory.done and rows appended to inventory.jsonl.gz, so a rerun (after
    a network reset, say) resumes exactly where it stopped.
    """
    out_dir.mkdir(parents=True, exist_ok=True)
    inv_path = out_dir / "inventory.jsonl.gz"
    done_path = out_dir / "inventory.done"
    done = set(done_path.read_text(encoding="utf-8").splitlines()) if done_path.exists() else set()
    tasks = [(pref, yy, delay) for yy in YEARS for pref in PREFIXES
             if f"{pref}/{str(yy)[2:]}" not in done]
    print(f"inventory blocks: {len(tasks)} to do ({len(done)} journaled)", flush=True)
    total = 0
    with Pool(workers) as pool:
        for pref, yy2, found, block_rows in pool.imap_unordered(_inventory_block, tasks):
            if block_rows:
                with gzip.open(inv_path, "at", encoding="utf-8", compresslevel=4) as f:
                    for r in block_rows:
                        f.write(json.dumps(r, ensure_ascii=False) + "\n")
                total += len(block_rows)
            with done_path.open("a", encoding="utf-8") as f:
                f.write(f"{pref}/{yy2}\n")
            if found:
                print(f"  {pref}/{yy2}: {found} controls (+{total} rows so far)", flush=True)
    rows = []
    seen = set()
    with gzip.open(inv_path, "rt", encoding="utf-8") as f:
        for line in f:
            try:
                r = json.loads(line)
                if r["control_url"] not in seen:
                    seen.add(r["control_url"])
                    rows.append(r)
            except Exception:
                pass
    print(f"inventory controls: {len(rows):,}", flush=True)
    return rows


def compress(jsonl: Path, out_dir: Path) -> Path:
    target = out_dir / f"{KEY}.jsonl.zst"
    try:
        subprocess.run(["zstd", "-19", "-f", "--rm", str(jsonl), "-o", str(target)], check=True)
    except (FileNotFoundError, subprocess.CalledProcessError):
        import zstandard
        with open(jsonl, "rb") as src, open(target, "wb") as dst:
            zstandard.ZstdCompressor(level=19).copy_stream(src, dst)
        jsonl.unlink()
    return target


def main() -> int:
    parser = argparse.ArgumentParser()
    parser.add_argument("--out", type=Path, default=Path("."))
    parser.add_argument("--delay", type=float, default=0.2)
    parser.add_argument("--max-docs", type=int, default=0)
    args = parser.parse_args()
    args.out.mkdir(parents=True, exist_ok=True)
    jsonl = args.out / f"{KEY}.jsonl"
    t0 = time.time()
    controls = inventory(args.out, args.delay)
    print(f"inventory controls: {len(controls):,}", flush=True)
    done = set()
    if jsonl.exists():
        with open(jsonl, encoding="utf-8") as f:
            for line in f:
                try:
                    done.add(json.loads(line)["record_id"])
                except Exception:
                    pass
    kept = skipped = 0
    with open(jsonl, "a", encoding="utf-8") as fo:
        for row in controls:
            raw = _get(row["control_url"])
            if raw is None:
                skipped += 1
                continue
            html_src = raw.decode("utf-8", "replace")
            meta, pdfs = parse_control_page(row["control_url"], html_src)
            for i, pdf_url in enumerate(pdfs):
                rid = f"{meta['control_id'] or row['control_url'].rstrip('/').split('/')[-1]}#{i}"
                if rid in done:
                    continue
                blob = _get(pdf_url)
                if blob is None:
                    skipped += 1
                    continue
                try:
                    text = pdf_to_text(blob)
                except Exception:
                    skipped += 1
                    continue
                text = re.sub(r"[ \t]+", " ", text)
                text = "\n".join(line.strip() for line in text.splitlines() if line.strip())
                if len(text) < MIN_CHARS:
                    skipped += 1
                    continue
                fo.write(json.dumps({
                    "id": f"{KEY}_{meta['control_id'].replace('/', '_').lower()}_{i}" if meta["control_id"] else f"{KEY}_{abs(hash(pdf_url)) % 10**12}_{i}",
                    "record_id": rid,
                    "text": text,
                    "created": meta["published"],
                    "license": LICENSE,
                    "author": AUTHOR,
                    "control_id": meta["control_id"],
                    "title": meta["title"],
                    "field": meta["field"],
                    "source_url": pdf_url,
                }, ensure_ascii=False) + "\n")
                done.add(rid)
                kept += 1
                if args.max_docs and kept >= args.max_docs:
                    break
            if (kept + skipped) % 50 == 0:
                print(f"  seen {kept + skipped:,} kept {kept:,} skip {skipped:,} "
                      f"{(kept + skipped) / max(time.time() - t0, 1):.2f}/s", flush=True)
            if args.max_docs and kept >= args.max_docs:
                break
            if args.delay:
                time.sleep(args.delay)
    print(f"fetched {kept:,} new reports ({skipped:,} skipped); compressing...", flush=True)
    target = compress(jsonl, args.out)
    print(f"wrote {target} in {round(time.time() - t0)}s")
    return 0


if __name__ == "__main__":
    raise SystemExit(main())