# ── Stage 1: Install dependencies ─────────────────────────────────────────────
FROM node:20-slim AS deps
WORKDIR /app
COPY frontend/package*.json ./
RUN npm ci

# ── Stage 2: Build Next.js ─────────────────────────────────────────────────────
FROM node:20-slim AS builder
WORKDIR /app

COPY --from=deps /app/node_modules ./node_modules
COPY frontend/ .

# Bake the backend HuggingFace Space URL at build time.
# NEXT_PUBLIC_* vars are embedded into the JS bundle during `next build`,
# so they must be set here — not at container start.
ARG NEXT_PUBLIC_API_URL=https://trojan0x-caretrace-backend.hf.space
ENV NEXT_PUBLIC_API_URL=$NEXT_PUBLIC_API_URL

RUN npm run build

# ── Stage 3: Lean production runner ───────────────────────────────────────────
FROM node:20-slim AS runner
WORKDIR /app

ENV NODE_ENV=production
# HuggingFace Spaces requires port 7860
ENV PORT=7860
ENV HOSTNAME=0.0.0.0

# Copy only the standalone output — no node_modules needed
COPY --from=builder /app/.next/standalone ./
COPY --from=builder /app/.next/static ./.next/static
COPY --from=builder /app/public ./public

EXPOSE 7860

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