FROM node:18-alpine AS builder

# Create app directory
RUN mkdir -p /app
WORKDIR /app

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

# Install dependencies
RUN npm ci --only=production

# Copy source code
COPY . .

# Production stage
FROM node:18-alpine

# Create app directory
RUN mkdir -p /app
WORKDIR /app

# Copy built application from builder stage
COPY --from=builder /app .

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

# Change ownership of the app directory to nodejs user
RUN chown -R nodejs:nodejs /app
USER nodejs

# Expose the port the app runs on
EXPOSE 8080

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
  CMD node -e "require('http').get('http://localhost:8080/', (res) => { process.exit(res.statusCode === 200 ? 0 : 1) })"

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