# syntax=docker/dockerfile:1

# Stage 1: Install dependencies
FROM node:22-alpine AS deps
RUN apk add --no-cache libc6-compat
WORKDIR /app

COPY package.json package-lock.json ./
# devDeps are required to build (typescript, tailwind, eslint-config-next).
# This whole stage is discarded — none of it reaches the runner.
RUN npm ci --no-audit --no-fund

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

ENV NEXT_TELEMETRY_DISABLED=1
ENV NODE_ENV=production
# Each Docker build starts from a clean layer, so Turbopack's .next/cache is
# written but never restored. Skipping it cuts ~20% of build CPU (the metric
# that matters on a 1-vCPU host) and 116 MB off this layer.
ENV CI_BUILD=1

RUN npm run build

# Stage 3: Production runner with Next.js Standalone
FROM node:22-alpine AS runner
RUN apk add --no-cache libc6-compat
WORKDIR /app

ENV NODE_ENV=production
ENV NEXT_TELEMETRY_DISABLED=1
ENV PORT=3000
ENV HOSTNAME="0.0.0.0"

# Run as a non-root user; nextjs owns nothing it does not need to write.
RUN addgroup -g 1001 -S nodejs && adduser -u 1001 -S nextjs -G nodejs

# Copy public static assets and standalone build output.
# These three paths are the ENTIRE runtime payload (~57 MB). Never copy the
# whole .next/ directory here — .next/dev and .next/cache are build-host-only
# and account for ~1.96 GB.
COPY --from=builder --chown=nextjs:nodejs /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

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