# 1) Base
FROM node:18-alpine AS base
WORKDIR /app
ENV NEXT_TELEMETRY_DISABLED=1

# 2) Deps
FROM base AS deps
RUN apk add --no-cache libc6-compat
COPY package.json package-lock.json ./
RUN npm ci

# 3) Builder
FROM base AS builder
COPY --from=deps /app/node_modules ./node_modules
COPY . .
ENV NODE_ENV=production

# falls public nicht existiert -> anlegen, damit COPY später nicht crasht
RUN mkdir -p public

RUN npm run build
RUN npm prune --omit=dev

# 4) Runner
FROM node:18-alpine AS runner
WORKDIR /app
ENV NODE_ENV=production \
    NEXT_TELEMETRY_DISABLED=1 \
    PORT=3000 \
    HOSTNAME=0.0.0.0

RUN addgroup -S nodejs && adduser -S nextjs -G nodejs

# Assets & Build-Output kopieren
COPY --from=builder /app/public ./public
COPY --from=builder /app/.next ./.next
COPY --from=builder /app/node_modules ./node_modules
COPY --from=builder /app/package.json ./package.json

USER nextjs
EXPOSE 3000
CMD ["node_modules/.bin/next", "start", "-p", "3000"]