# Use Node.js 20 as the base image
FROM node:20-alpine AS base

# Install dependencies only when needed
FROM base AS deps
RUN apk add --no-cache libc6-compat
WORKDIR /app

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

# Build the application
FROM base AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .

# Set environment variables for build
ENV NEXT_TELEMETRY_DISABLED 1

# Build Next.js application
RUN npm run build

# Production image
FROM base AS runner
WORKDIR /app

ENV NODE_ENV production
ENV NEXT_TELEMETRY_DISABLED 1

# Create a non-root user
RUN addgroup --system --gid 1001 nodejs
RUN adduser --system --uid 1001 nextjs

# Copy built application
COPY --from=builder /app/public ./public
COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static

# Create data directory for file uploads (Hugging Face persistent storage)
# Note: /data is persistent in Hugging Face Spaces
RUN mkdir -p /data/documents /data/public /data/exams /data/files /data/sessions
RUN chown -R nextjs:nodejs /data

# Switch to non-root user
USER nextjs

# Expose port 7860 for Hugging Face Spaces
EXPOSE 7860

# Set environment variables for Hugging Face Spaces
ENV PORT=7860
ENV HOSTNAME="0.0.0.0"
ENV REUBENOS_URL="http://0.0.0.0:7860"

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
  CMD node -e "require('http').get('http://localhost:7860/api/health', (res) => process.exit(res.statusCode === 200 ? 0 : 1))"

# Start both Next.js and MCP servers
CMD ["sh", "-c", "node server.js"]