#!/usr/bin/env bash
# CHECK — git author census re-derivation verification.
#
# Re-derives the identity census from live `git log` (current branch HEAD) and
# compares it, field-for-field, against the committed
# git-author-census-2026-10-23.json. Exits 0 only on exact match.
set -u

REPO=/root/troupe-standup
OUT="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
JSON="$OUT/git-author-census-2026-10-23.json"
MD="$OUT/git-author-census-2026-10-23.md"

echo "[CHECK] re-deriving identity census from git log (HEAD) ..."
python3 - "$JSON" "$MD" <<'PY'
import json, subprocess, sys
from collections import Counter, defaultdict

json_path, md_path = sys.argv[1], sys.argv[2]
repo = "/root/troupe-standup"

def derive():
    out = subprocess.run(
        ["git", "-C", repo, "log", "--format=%an%x00%ae%x00%ad", "--date=iso-strict"],
        capture_output=True, text=True, check=True).stdout
    by_pair = defaultdict(list)
    for line in out.splitlines():
        if not line.strip():
            continue
        name, email, date = line.split("\x00")
        by_pair[(name, email)].append(date)
    rows = []
    for (name, email), dates in by_pair.items():
        rows.append({"name": name, "email": email, "count": len(dates),
                     "first": min(dates), "last": max(dates)})
    name_counts = Counter(r["name"] for r in rows)
    email_counts = Counter(r["email"] for r in rows)
    for r in rows:
        r["name_collides"] = name_counts[r["name"]] > 1
        r["email_collides"] = email_counts[r["email"]] > 1
    rows.sort(key=lambda r: (-r["count"], r["name"], r["email"]))
    return rows

expected = derive()
committed = json.load(open(json_path))["census"]

if len(expected) != len(committed):
    print("  LENGTH MISMATCH: derived %d rows, committed %d rows" %
          (len(expected), len(committed)), file=sys.stderr)
    sys.exit(1)

for i, (e, c) in enumerate(zip(expected, committed)):
    for k in ("name", "email", "count", "first", "last", "name_collides", "email_collides"):
        if e.get(k) != c.get(k):
            print("  ROW %d FIELD %r MISMATCH: derived=%r committed=%r" %
                  (i, k, e.get(k), c.get(k)), file=sys.stderr)
            sys.exit(1)

print("[CHECK] derived %d identity rows; exact match against %s — PASS" %
      (len(expected), json_path))

d = json.load(open(json_path))
md = open(md_path).read()
for needle in [str(d["total_commits"]), str(d["distinct_identities"]),
               str(len(set(c["name"] for c in d["census"]))),
               str(len(set(c["email"] for c in d["census"])))]:
    if needle not in md:
        print("  HEADLINE MISMATCH: missing " + needle, file=sys.stderr)
        sys.exit(1)
print("[CHECK] headline totals present in .md — PASS")
PY
if [ $? -ne 0 ]; then exit 1; fi

echo "CHECK PASS: git author census re-derives cleanly."
exit 0