FROM node:20-alpine AS builder
WORKDIR /app
COPY frontend/package*.json ./
# Use npm ci when lockfile exists, fallback to npm install
RUN sh -c 'if [ -f package-lock.json ] || [ -f npm-shrinkwrap.json ]; then npm ci; else npm install; fi'
COPY frontend/ ./
RUN npm run build --prefix frontend

FROM nginx:stable-alpine
COPY --from=builder /app/frontend/dist /usr/share/nginx/html
COPY deploy/nginx/docker-chat.conf /etc/nginx/conf.d/default.conf
EXPOSE 8443
CMD ["nginx", "-g", "daemon off;"]