Dockerfile.frontend

# Stage 1: Install dependencies
FROM node:22-alpine AS deps
WORKDIR /app
COPY package.json package-lock.json ./
RUN npm ci

# Stage 2: Build standalone Next.js bundle
FROM node:22-alpine AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .

# NEXT_PUBLIC_* vars are inlined at build time -- runtime env has no effect.
# /api means all frontend requests go to the same origin; Caddy strips the
# prefix before forwarding to the backend.
ARG NEXT_PUBLIC_API_URL=/api
ENV NEXT_PUBLIC_API_URL=$NEXT_PUBLIC_API_URL

RUN npm run build

# Stage 3: Minimal production runner (~150MB)
FROM node:22-alpine AS runner
WORKDIR /app

ENV NODE_ENV=production

RUN addgroup --system --gid 1001 nodejs && \
    adduser --system --uid 1001 nextjs

COPY --from=builder /app/public ./public
COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static

USER nextjs
EXPOSE 3000
ENV PORT=3000
ENV HOSTNAME=0.0.0.0

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