FROM node:20-slim

# Install curl for health checks
RUN apt-get update && apt-get install -y \
    curl \
    && rm -rf /var/lib/apt/lists/* \
    && apt-get clean

WORKDIR /app

# Copy package files
COPY package*.json ./

# Install Node dependencies (using install instead of ci for flexibility)
RUN npm install --omit=dev && npm cache clean --force

# Copy source
COPY cpu.js .

# No need to create the user/group, they exist in the base image.
# Just set the permissions and switch.
RUN chown -R node:node /app
USER node

EXPOSE 7860

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=10s --retries=3 \
  CMD node -e "require('http').get('http://localhost:7860/health', (res) => { process.exit(res.statusCode === 200 ? 0 : 1) }).on('error', () => process.exit(1))"

CMD ["node", "cpu.js"]