# Multi-stage build for Next.js application
FROM node:18-alpine AS base

# Install dependencies only when needed
FROM base AS deps
RUN apk add --no-cache libc6-compat
WORKDIR /app

COPY package.json package-lock.json* ./
RUN npm ci

# Build the application
FROM base AS builder
WORKDIR /app
COPY --from=deps /app/node_modules ./node_modules
COPY . .
RUN npm run build

# Production image - run Next.js server
FROM base AS runner
WORKDIR /app

ENV NODE_ENV=production

RUN addgroup --system --gid 1001 nodejs \
    && adduser --system --uid 1001 nextjs

# Copy only necessary files
COPY --from=builder /app/public ./public
COPY --from=builder /app/package.json ./package.json
COPY --from=deps /app/node_modules ./node_modules
COPY --from=builder /app/.next ./.next

RUN chown -R nextjs:nodejs /app
USER nextjs

ENV PORT=3000
EXPOSE ${PORT}

# Run Next.js with npm start
CMD ["npm", "start"]