#!/bin/sh
# Generates runtime frontend config from container environment.
# Runs automatically at container start via nginx's /docker-entrypoint.d/.
# Lets one image talk to any backend: set VITE_API_URL on the service
# (compose environment or .env) and restart — no rebuild needed.
# The app (src/api/agent.ts) prefers this file, falling back to the
# build-time VITE_API_URL when it is absent (local dev, vite preview).
set -eu

CONFIG_FILE="/usr/share/nginx/html/config.js"
mkdir -p "$(dirname "${CONFIG_FILE}")"

if [ -z "${VITE_API_URL:-}" ]; then
  echo "frontend-config: VITE_API_URL not set, writing empty config (build-time env applies)"
  printf 'window.__APP_CONFIG__ = {};\n' > "${CONFIG_FILE}"
else
  echo "frontend-config: writing config.js with VITE_API_URL=${VITE_API_URL}"
  printf 'window.__APP_CONFIG__ = { VITE_API_URL: "%s" };\n' "${VITE_API_URL}" > "${CONFIG_FILE}"
fi