# Multi-stage Dockerfile for Next.js Standalone Production Deployment
FROM node:20-alpine AS base

# Install libc6-compat if needed by some native packages
RUN apk add --no-cache libc6-compat

WORKDIR /app

# Stage 1: Install dependencies based on package-lock.json
FROM base AS deps
WORKDIR /app

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

# Stage 2: Build the Next.js application
FROM base AS builder
WORKDIR /app

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

# Pass build arguments for client-side environment variables
ARG NEXT_PUBLIC_BACKEND_URL
ARG NEXT_PUBLIC_REVERB_APP_KEY
ARG NEXT_PUBLIC_REVERB_HOST
ARG NEXT_PUBLIC_REVERB_PORT
ARG NEXT_PUBLIC_REVERB_SCHEME

ENV NEXT_PUBLIC_BACKEND_URL=${NEXT_PUBLIC_BACKEND_URL}
ENV NEXT_PUBLIC_REVERB_APP_KEY=${NEXT_PUBLIC_REVERB_APP_KEY}
ENV NEXT_PUBLIC_REVERB_HOST=${NEXT_PUBLIC_REVERB_HOST}
ENV NEXT_PUBLIC_REVERB_PORT=${NEXT_PUBLIC_REVERB_PORT}
ENV NEXT_PUBLIC_REVERB_SCHEME=${NEXT_PUBLIC_REVERB_SCHEME}
ENV NEXT_TELEMETRY_DISABLED=1
ENV NODE_ENV=production
ENV NODE_OPTIONS="--max-old-space-size=4096"

RUN npm run build

# Stage 3: Minimal 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 public assets and standalone build artifacts
COPY --from=builder /app/public ./public

# Automatically copy standalone output and static files
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"]