#!/usr/bin/env bash
# commit-msg hook: require meaningful regression tests for fix commits.
#
# Installed by scripts/dev-setup.sh as .git/hooks/commit-msg.
# A deterministic-reproduction impossibility exemption must include its reason;
# CI still requires an independent approving review before accepting it.

set -euo pipefail

MSG_FILE="$1"
REPO_ROOT=$(git rev-parse --show-toplevel)
FIRST_LINE=$(head -1 "$MSG_FILE")
COMMIT_BODY=$(<"$MSG_FILE")
CHECKER="$REPO_ROOT/scripts/ci/regression-test-check.py"

if [[ ! -f "$CHECKER" ]] || ! command -v python3 >/dev/null 2>&1; then
  echo "commit-msg-regression: checker unavailable; CI will enforce." >&2
  exit 0
fi

python3 "$CHECKER" \
  --repo "$REPO_ROOT" \
  --base HEAD \
  --head INDEX \
  --title "$FIRST_LINE" \
  --commit-bodies "$COMMIT_BODY" \
  --allow-unreviewed-reasoned-marker