#!/usr/bin/env bash
# CHECK -- commit-author census extract (Extract lane, ledger).
#
# Replays `git log --format=%an` from the committed tree and diffs the derived
# author->count map against the committed commits-by-author.tsv and
# commits-by-author.json. Exit code IS the verdict:
#   0 = PASS (replay matches committed files)
#   nonzero = FAIL
#
# No || true / ; true / ; echo arms, no trailing prose: the exit code is the
# verdict and a prose gloss is a fault (tools/check_lint.py).

set -u

# Resolve the repo root from git so the check is location-independent.
REPO="$(git rev-parse --show-toplevel)" || exit 1
ART="$REPO/wizard-work/ledger/2026-10-29-commit-author-census"
cd "$ART" || exit 1

python3 - <<'PY'
import csv
import json
import subprocess
import sys

out = subprocess.run(
    ["git", "log", "--format=%an"], capture_output=True, text=True, check=True
).stdout
counts = {}
for line in out.splitlines():
    counts[line] = counts.get(line, 0) + 1

# Deterministic order: count desc, author asc (matches the committed TSV/JSON).
expected = sorted(counts.items(), key=lambda kv: (-kv[1], kv[0]))

with open("commits-by-author.tsv", encoding="utf-8") as fh:
    tsv = list(csv.reader(fh, delimiter="\t"))
committed = [(r[0], int(r[1])) for r in tsv[1:]]

if len(expected) != len(committed):
    print(f"FAIL: author count replay={len(expected)} committed={len(committed)}")
    sys.exit(1)
for (a_exp, c_exp), (a_got, c_got) in zip(expected, committed):
    if a_exp != a_got or c_exp != c_got:
        print(f"FAIL: TSV author={a_exp}/{c_exp} got={a_got}/{c_got}")
        sys.exit(1)

with open("commits-by-author.json", encoding="utf-8") as fh:
    j = json.load(fh)
if j.get("total_commits") != sum(c for _, c in expected):
    print("FAIL: JSON total_commits mismatch")
    sys.exit(1)
if j.get("authors") != len(expected):
    print("FAIL: JSON authors mismatch")
    sys.exit(1)
for (a_exp, c_exp), gl in zip(expected, j["rows"]):
    if (a_exp, c_exp) != (gl["author"], gl["commits"]):
        print(f"FAIL: JSON row {a_exp}/{c_exp} got {gl['author']}/{gl['commits']}")
        sys.exit(1)

print(
    f"PASS: {len(expected)} authors, {sum(c for _, c in expected)} commits "
    f"(replay == commits-by-author.tsv + .json)"
)
PY
exit $?