FROM node:20-alpine AS base

# Install dependencies only when needed
FROM base AS deps
# Check https://github.com/nodejs/docker-node/tree/b4117f9333da4138b03a546ec926ef50a31506c3#nodealpine to understand why libc6-compat might be needed.
RUN apk add --no-cache libc6-compat
WORKDIR /app

# Install dependencies
COPY package.json package-lock.json* ./
RUN npm ci

# Rebuild the source code only when needed
FROM base AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .

# Disable Next.js telemetry
ENV NEXT_TELEMETRY_DISABLED=1

RUN npm run build

# Production image, copy all the files and run next
FROM base AS runner
WORKDIR /app

ENV NODE_ENV=production
ENV NEXT_TELEMETRY_DISABLED=1

# The node:alpine image already has a built-in 'node' user with uid 1000
# which is perfect for Hugging Face Spaces!

COPY --from=builder /app/public ./public

# Automatically leverage output traces to reduce image size
COPY --from=builder --chown=node:root /app/.next/standalone ./
COPY --from=builder --chown=node:root /app/.next/static ./.next/static

USER node

# Hugging Face routes traffic to port 7860
EXPOSE 7860
ENV PORT=7860
# Set hostname to 0.0.0.0 so it binds to all interfaces
ENV HOSTNAME="0.0.0.0"

# server.js is created by next build from the standalone output
CMD ["node", "server.js"]