# Use node 18 alpine for smaller image size
FROM node:18-alpine

WORKDIR /app

# Install dumb-init for proper signal handling
RUN apk add --no-cache dumb-init

# Copy package files
COPY package*.json ./

# Install all dependencies (including devDependencies needed for build)
# Set npm config for better CI performance
RUN npm ci --prefer-offline --no-audit

# Copy source code
COPY . .

# Set Node.js memory limit for build (helpful in constrained environments)
ENV NODE_OPTIONS="--max-old-space-size=1024"

# Build the application
RUN npm run build

# Remove devDependencies after build to reduce image size
RUN npm prune --omit=dev

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

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

EXPOSE 3000

# Use dumb-init to handle signals properly
ENTRYPOINT ["dumb-init", "--"]
CMD ["npm", "start"]