# ── Stage 1: build the React app ─────────────────────────────────────────────
FROM node:20-alpine AS builder

WORKDIR /app
COPY package.json package-lock.json* ./
RUN npm ci

COPY public/ ./public/
COPY src/ ./src/

# API calls are proxied by nginx so no REACT_APP_API_URL needed
RUN npm run build

# ── Stage 2: serve with nginx ─────────────────────────────────────────────────
FROM nginx:alpine

COPY --from=builder /app/build /usr/share/nginx/html
COPY nginx.conf /etc/nginx/conf.d/default.conf

EXPOSE 80

CMD ["nginx", "-g", "daemon off;"]