# ==============================================================================
# Stage 1: Install dependencies
# ==============================================================================
FROM node:20-alpine AS deps
WORKDIR /app

# Install libc6-compat for compatibility
RUN apk add --no-cache libc6-compat

COPY package.json package-lock.json ./
RUN npm ci

# ==============================================================================
# Stage 2: Build the Next.js application
# ==============================================================================
FROM node:20-alpine AS builder
WORKDIR /app

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

# Set build-time environment variables
ENV NEXT_TELEMETRY_DISABLED=1
ENV NODE_ENV=production

RUN npm run build

# ==============================================================================
# Stage 3: Production runner
# ==============================================================================
FROM node:20-alpine AS runner
WORKDIR /app

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

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

# Copy static assets and standalone build output
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

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

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