# Stage 1: Build the Next.js application
FROM node:20-alpine AS builder
WORKDIR /app
# Enable Corepack
RUN corepack enable

# Set Yarn to the latest stable version
RUN yarn set version stable

COPY package.json package-lock.json ./
RUN yarn install
COPY . .
RUN yarn build

# Stage 2: Create the production image
FROM node:20-alpine AS runner
WORKDIR /app

ENV NODE_ENV=production
# Optional: disable Next.js telemetry
ENV NEXT_TELEMETRY_DISABLED=1

# Create a non-root user
RUN addgroup --system --gid 1001 nodejs
RUN adduser --system --uid 1001 nextjs
USER nextjs

# Copy the standalone output from the builder stage
COPY --from=builder /app/public ./public
# Automatically leverage output traces to reduce image size
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
# The standalone output generates a server.js file that starts the app
CMD ["node", "server.js"]