# Multi-stage Dockerfile for Next.js application

# Stage 1: Dependencies
FROM node:18-alpine AS deps
WORKDIR /app

# Install dependencies based on the preferred package manager
COPY package.json package-lock.json* ./
RUN npm ci --only=production && npm cache clean --force

# Stage 2: Build
FROM node:18-alpine AS builder
WORKDIR /app

# Copy package files
COPY package.json package-lock.json* ./

# Install all dependencies (including dev dependencies)
RUN npm ci

# Copy source code
COPY . .

# Build the application
RUN npm run build

# Stage 3: Production
FROM node:18-alpine AS runner
WORKDIR /app

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

# Copy the public folder
COPY --from=builder /app/public ./public

# Set the correct permission for prerender cache
RUN mkdir .next
RUN chown nextjs:nodejs .next

# Copy built application from builder stage
COPY --from=builder --chown=nextjs:nodejs /app/.next/standalone ./
COPY --from=builder --chown=nextjs:nodejs /app/.next/static ./.next/static

# Switch to non-root user
USER nextjs

# Expose port
EXPOSE 3000

# Set port environment variable
ENV PORT=3000
ENV HOSTNAME="0.0.0.0"

# Health check
HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
  CMD node -e "require('http').get('http://localhost:3000', (res) => { process.exit(res.statusCode === 200 ? 0 : 1) })"

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