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# Multi-Stage Production Next.js Dockerfile
FROM node:20-alpine AS base
WORKDIR /app
ENV NODE_ENV=production

# 1. Install dependencies only when needed
FROM base AS deps
RUN apk add --no-cache libc6-compat
COPY package.json package-lock.json* pnpm-lock.yaml* yarn.lock* ./
RUN \
  if [ -f package-lock.json ]; then npm ci; \
  elif [ -f pnpm-lock.yaml ]; then corepack enable pnpm && pnpm i --frozen-lockfile; \
  elif [ -f yarn.lock ]; then yarn --frozen-lockfile; \
  else npm i; \
  fi

# 2. Rebuild the source code only when needed
FROM base AS builder
COPY --from=deps /app/node_modules ./node_modules
COPY . .
ENV NEXT_TELEMETRY_DISABLED=1
RUN npm run build

# 3. Production runner image
FROM base AS runner
ENV NODE_ENV=production
ENV NEXT_TELEMETRY_DISABLED=1
RUN addgroup --system --gid 1001 nodejs && adduser --system --uid 1001 nextjs
USER nextjs

COPY --from=builder /app/public ./public
# Automatically leverage output traces to reduce image size
# https://nextjs.org/docs/advanced-features/output-file-tracing
COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static

EXPOSE 3000
ENV PORT=3000
ENV HOSTNAME="0.0.0.0"

HEALTHCHECK --interval=30s --timeout=5s --start-period=5s --retries=3 \
  CMD wget --no-verbose --tries=1 --spider http://localhost:3000/api/health || exit 1

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