# Use Node.js 18 Alpine for smaller image size
FROM node:18-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 based on the preferred package manager
COPY package*.json pnpm-lock.yaml* ./
RUN \
  if [ -f pnpm-lock.yaml ]; then \
    corepack enable pnpm && pnpm i --frozen-lockfile; \
  elif [ -f package-lock.json ]; then \
    npm ci; \
  else \
    echo "Lockfile not found." && exit 1; \
  fi

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

# Build the Next.js application
RUN \
  if [ -f pnpm-lock.yaml ]; then \
    corepack enable pnpm && pnpm run build; \
  else \
    npm run build; \
  fi

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

ENV NODE_ENV production
# Uncomment the following line in case you want to disable telemetry during runtime.
# ENV NEXT_TELEMETRY_DISABLED 1

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

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

# Set the correct permission for prerender cache
RUN mkdir .next
RUN chown nextjs:nodejs .next

# Automatically leverage output traces to reduce image size
# https://nextjs.org/docs/advanced-features/output-file-tracing
COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static

USER nextjs

# Expose port 7860 (Hugging Face Spaces default)
EXPOSE 7860

ENV PORT 7860
ENV HOSTNAME "0.0.0.0"

# Run the application
CMD ["node", "server.js"]