#!/bin/sh
set -euo pipefail

export npm_config_cache=${npm_config_cache:-/tmp/.npm}
mkdir -p "$(dirname "$npm_config_cache")" "$npm_config_cache" 2>/dev/null || true

LOCKFILE_STAMP="node_modules/.package-lock.cksum"
CURRENT_LOCKFILE_CKSUM=$(cksum package-lock.json | awk '{print $1 ":" $2}')
INSTALLED_LOCKFILE_CKSUM=""

if [ -f "$LOCKFILE_STAMP" ]; then
  INSTALLED_LOCKFILE_CKSUM=$(cat "$LOCKFILE_STAMP")
fi

if [ ! -x node_modules/.bin/vite ] || [ "$CURRENT_LOCKFILE_CKSUM" != "$INSTALLED_LOCKFILE_CKSUM" ]; then
  echo "[frontend] Installing dependencies via npm ci..."
  npm ci --include=dev
  printf '%s' "$CURRENT_LOCKFILE_CKSUM" > "$LOCKFILE_STAMP"
else
  echo "[frontend] Using existing node_modules cache."
fi

echo "[frontend] Starting dev server..."
exec npm start