#!/bin/sh
set -eu

if [ "${GITNEXUS_AUTO_REFRESH:-1}" = "0" ]; then
  echo "GitNexus auto refresh disabled by GITNEXUS_AUTO_REFRESH=0"
  exit 0
fi

repo_root=$(git rev-parse --show-toplevel 2>/dev/null) || {
  echo "Not inside a git repository"
  exit 1
}
cd "$repo_root"

git_dir=$(git rev-parse --git-dir)
case "$git_dir" in
  /*) ;;
  *) git_dir="$repo_root/$git_dir" ;;
esac

head_commit=$(git rev-parse HEAD 2>/dev/null || true)
if [ -z "$head_commit" ]; then
  echo "No HEAD commit found; skip GitNexus refresh"
  exit 0
fi

stamp_file="$git_dir/gitnexus-indexed-head"
lock_dir="$git_dir/gitnexus-refresh.lock"

if [ -f "$stamp_file" ] && [ "$(cat "$stamp_file" 2>/dev/null || true)" = "$head_commit" ]; then
  echo "GitNexus index already refreshed for $head_commit"
  exit 0
fi

if ! mkdir "$lock_dir" 2>/dev/null; then
  echo "GitNexus refresh already running; skip"
  exit 0
fi

cleanup() {
  rmdir "$lock_dir" 2>/dev/null || true
}
trap cleanup EXIT HUP INT TERM

echo "GitNexus refresh started for $head_commit"

if npx gitnexus analyze --index-only --name anxinyan .; then
  printf '%s\n' "$head_commit" > "$stamp_file"
  echo "GitNexus refresh completed for $head_commit"
else
  status=$?
  echo "GitNexus refresh failed with exit code $status"
  exit "$status"
fi