# ==============================================================================
# Stage 1: Install Dependencies
# ==============================================================================
FROM node:20-alpine AS deps
RUN apk add --no-cache libc6-compat
WORKDIR /app

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

# ==============================================================================
# Stage 2: Build Application
# ==============================================================================
FROM node:20-alpine AS builder
WORKDIR /app

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

# Build-time argument for inlining client-side API URL into Next.js bundle
ARG NEXT_PUBLIC_API_BASE_URL
ENV NEXT_PUBLIC_API_BASE_URL=${NEXT_PUBLIC_API_BASE_URL} \
    NEXT_TELEMETRY_DISABLED=1 \
    NODE_ENV=production

RUN npm run build

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

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

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

# Copy static assets and public directories
COPY --from=builder /app/public ./public

# Set permissions for prerender cache
RUN mkdir .next && chown nextjs:nodejs .next

# Copy standalone build output and static assets
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=5s --start-period=10s --retries=3 \
  CMD wget --no-verbose --tries=1 --spider http://localhost:3000/ || exit 1

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