# ── Stage 1: Build ──────────────────────────────────────────────
FROM node:20-alpine AS builder

WORKDIR /app

# Copy dependency files first for better layer caching
COPY package.json package-lock.json* ./

RUN npm ci

# Copy the rest of the source
COPY . .

# NEXT_PUBLIC_ vars must be available at build time
ARG NEXT_PUBLIC_API_URL=https://your-backend.hf.space
ENV NEXT_PUBLIC_API_URL=$NEXT_PUBLIC_API_URL

RUN npm run build

# ── Stage 2: Runner ──────────────────────────────────────────────
FROM node:20-alpine AS runner

WORKDIR /app

ENV NODE_ENV=production
# Hugging Face Spaces requires the app to listen on port 7860
ENV PORT=7860
ENV HOSTNAME=0.0.0.0

# Only copy what is needed at runtime
COPY --from=builder /app/public ./public
COPY --from=builder /app/.next/standalone ./
COPY --from=builder /app/.next/static ./.next/static

EXPOSE 7860

CMD ["node", "server.js"]