# ---- 1) Install deps --------------------------------------------------------
FROM node:20-alpine AS deps
WORKDIR /app
COPY package*.json ./
# Works even if there is no package-lock.json
RUN npm install

# ---- 2) Build the Next.js app ----------------------------------------------
FROM node:20-alpine AS builder
WORKDIR /app
ENV NEXT_TELEMETRY_DISABLED=1
COPY --from=deps /app/node_modules ./node_modules
COPY . .
RUN npm run build

# ---- 3) Runtime -------------------------------------------------------------
FROM node:20-alpine AS runner
WORKDIR /app

ENV NODE_ENV=production
ENV NEXT_TELEMETRY_DISABLED=1
ENV PORT=3000

# run as non-root
RUN addgroup -g 1001 -S nodejs && adduser -S nextjs -u 1001

# Copy the built app and runtime deps
COPY --from=builder /app/.next ./.next
COPY --from=builder /app/public ./public
COPY --from=builder /app/package*.json ./
COPY --from=builder /app/node_modules ./node_modules

# Trim dev deps from node_modules (optional but nice)
RUN npm prune --omit=dev

EXPOSE 3000
USER 1001
CMD ["npm", "start"]