# Multi-stage build for backend service
# Stage 1: Builder
FROM node:20-alpine AS builder

WORKDIR /app

# Copy package files
COPY package*.json ./

# Install dependencies
RUN npm ci --only=production

# Stage 2: Production
FROM node:20-alpine

# Create non-root user
RUN addgroup -g 1001 -S nodejs && \
    adduser -S nodejs -u 1001

WORKDIR /app

# Copy dependencies from builder
COPY --from=builder /app/node_modules ./node_modules

# Copy application code
COPY --chown=nodejs:nodejs src ./src

# Switch to non-root user
USER nodejs

# Expose port
EXPOSE 3000

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=40s --retries=3 \
    CMD node -e "require('http').get('http://localhost:3000/health', (r) => process.exit(r.statusCode === 200 ? 0 : 1))"

# Start application
CMD ["node", "src/server.js"]