# ==========================================
# Production-Ready Multi-Stage Dockerfile
# ==========================================

# Stage 1: Dependencies
FROM node:20-alpine AS deps
WORKDIR /app

# Copy package files
COPY package*.json ./

# Install production dependencies only
RUN npm ci --only=production && npm cache clean --force

# ==========================================
# Stage 2: Production Image
# ==========================================
FROM node:20-alpine AS runner
WORKDIR /app

# Set production environment
ENV NODE_ENV=production
ENV PORT=8080

# Create non-root user for security
RUN addgroup --system --gid 1001 nodejs && \
    adduser --system --uid 1001 nodeuser

# Copy dependencies from deps stage
COPY --from=deps /app/node_modules ./node_modules

# Copy application code
COPY --chown=nodeuser:nodejs . .

# Switch to non-root user
USER nodeuser

# Expose port
EXPOSE 8080

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
  CMD wget --no-verbose --tries=1 --spider http://localhost:8080/health || exit 1

# Start the application
CMD ["node", "index.js"]