# ═══════════════════════════════════════════════════════════════════════════
#  Stage 1 – deps: install node_modules with full cache mount
#  (This layer is only re-run when package.json / package-lock.json changes)
# ═══════════════════════════════════════════════════════════════════════════
FROM node:20-alpine AS deps

RUN apk add --no-cache libc6-compat
WORKDIR /app

COPY package.json package-lock.json* ./

# --mount=type=cache keeps the npm cache on the host between builds
# --prefer-offline avoids network fetches when the package is already cached
RUN --mount=type=cache,target=/root/.npm \
    npm ci --prefer-offline

# ═══════════════════════════════════════════════════════════════════════════
#  Stage 2 – builder: compile Next.js with build-cache mount for turbo-speed
# ═══════════════════════════════════════════════════════════════════════════
FROM node:20-alpine AS builder
WORKDIR /app

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

ENV NEXT_TELEMETRY_DISABLED=1
ENV NODE_ENV=production

ARG NEXT_PUBLIC_API_URL=http://backend:8000
ENV NEXT_PUBLIC_API_URL=${NEXT_PUBLIC_API_URL}

# Mount the Next.js build cache so incremental compilation is reused
RUN --mount=type=cache,target=/app/.next/cache \
    npm run build

# ═══════════════════════════════════════════════════════════════════════════
#  Stage 3 – runner: minimal production image (no node_modules, no sources)
# ═══════════════════════════════════════════════════════════════════════════
FROM node:20-alpine AS runner
WORKDIR /app

ENV NODE_ENV=production
ENV NEXT_TELEMETRY_DISABLED=1

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

# Copy only the standalone server output (no full node_modules)
COPY --from=builder /app/public ./public

RUN mkdir .next && chown nextjs:nodejs .next

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"]