# Use Node.js 18 LTS
FROM node:18-alpine

# Set working directory
WORKDIR /app

# Copy package files first (for better layer caching)
COPY package*.json ./

# Install dependencies and wget
RUN npm install --omit=dev && apk add --no-cache wget

# Create non-root user and a writable data directory before copying app code
RUN addgroup -g 1001 -S nodejs && \
    adduser -S nodejs -u 1001 && \
    mkdir -p /app/data && \
    chown nodejs:nodejs /app/data

# Copy application code (exclude node_modules via .dockerignore)
COPY --chown=nodejs:nodejs . .

# Switch to non-root user
USER nodejs

# Expose port
EXPOSE 3000

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
  CMD node -e "require('http').get('http://localhost:3000', (res) => { process.exit(res.statusCode === 200 ? 0 : 1) })"

# Start the application
CMD ["npm", "start"]