import sys, re
from pathlib import Path
from datetime import date
wiki = Path(sys.argv[1])
report = Path(sys.argv[2])
threshold = int(sys.argv[3])
today = date.today()
stale, fresh, nodate = [], [], []
for f in sorted(wiki.rglob('*.md')):
    rel = f.relative_to(wiki)
    if str(rel).startswith('raw/'):
        continue
    content = f.read_text(errors='ignore')
    upd = re.search(r'^updated:\s*(\S+)', content[:800], re.M)
    if not upd:
        nodate.append(str(rel))
        continue
    try:
        d = date.fromisoformat(upd.group(1))
    except ValueError:
        nodate.append(str(rel))
        continue
    age = (today - d).days
    (stale if age > threshold else fresh).append((str(rel), age, upd.group(1)))
stale.sort(key=lambda x: -x[1])
lines = [
    f"# Wiki freshness audit — {today.isoformat()}",
    f"Threshold: >{threshold} days since `updated`",
    "",
    f"## STALE ({len(stale)})",
    "",
]
for rel, age, d in stale:
    lines.append(f"- [{age:>3}d] {rel}  (updated {d})")
lines += [f"", f"## FRESH ({len(fresh)})", ""]
for rel, age, d in fresh:
    lines.append(f"- [{age:>3}d] {rel}")
lines += [f"", f"## NO updated DATE ({len(nodate)})", ""]
for rel in nodate:
    lines.append(f"- {rel}")
lines += [
    "",
    f"TOTAL: {len(stale)} stale, {len(fresh)} fresh, {len(nodate)} no-date of {len(stale)+len(fresh)+len(nodate)} pages",
]
report.parent.mkdir(parents=True, exist_ok=True)
report.write_text('\n'.join(lines))
print(f"[2/3] audit: {len(stale)} stale (>={threshold}d), {len(fresh)} fresh, {len(nodate)} no-date -> {report}")