FROM node:18-alpine

WORKDIR /app

# Copy package files
COPY package*.json ./

# Install dependencies (including dev deps for build)
RUN npm install && npm install -g serve

# Copy source code
COPY . .

# Install curl for health checks (as root)
RUN apk add --no-cache curl

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

# Build the application (with cache busting)
ARG BUILD_DATE
RUN echo "Building at: $BUILD_DATE" && npm run build

# Change ownership
RUN chown -R nextjs:nodejs /app
USER nextjs

# Expose port
EXPOSE 3000

# Health check
HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
    CMD curl -f http://localhost:3000 || exit 1

# Start the application using serve for production  
CMD ["serve", "-s", "dist", "-l", "3000"]