#!/bin/bash
set -euo pipefail

REPO_DIR="/opt/clawd"
REMOTE="origin"
BRANCH="main"
SERVICE="clawd.service"
NO_RESTART=false

for arg in "$@"; do
  case "$arg" in
    --no-restart) NO_RESTART=true ;;
  esac
done

echo "==> clawd update start"
date

if [ ! -d "$REPO_DIR/.git" ]; then
  echo "ERROR: $REPO_DIR is not a git repository"
  exit 1
fi

cd "$REPO_DIR"

echo "==> Fetching latest from $REMOTE/$BRANCH ..."
git fetch "$REMOTE"

LOCAL_COMMIT="$(git rev-parse HEAD)"
REMOTE_COMMIT="$(git rev-parse "$REMOTE/$BRANCH")"

echo "==> Local : $LOCAL_COMMIT"
echo "==> Remote: $REMOTE_COMMIT"

if [ "$LOCAL_COMMIT" = "$REMOTE_COMMIT" ]; then
  echo "==> Already up to date. Skip upgrade."
  exit 0
fi

echo "==> Updating working tree to $REMOTE/$BRANCH ..."
git reset --hard "$REMOTE/$BRANCH"
git clean -fd

if git diff --name-only "$LOCAL_COMMIT" "$REMOTE_COMMIT" | grep -Eq '(^|/)(package.json|package-lock.json)$'; then
  echo "==> Dependency files changed, running npm install ..."
  npm install --prefix "$REPO_DIR"
else
  echo "==> No dependency changes, skip npm install"
fi

echo "==> Current commit:"
git log --oneline -1

if [ "$NO_RESTART" = true ]; then
  echo "==> --no-restart: skip systemctl restart (caller handles restart)"
  exit 0
fi

echo "==> Restarting service: $SERVICE"
systemctl restart "$SERVICE"

echo "==> Service status:"
systemctl status "$SERVICE" --no-pager -l || true

echo "==> clawd update done"