FROM node:20-alpine AS builder
WORKDIR /app

# Install dependencies
COPY package.json package-lock.json ./
RUN npm ci

# Copy sources
COPY . .

# Build-time public env (embedded into client bundle)
ARG NEXT_PUBLIC_BACKEND_URL
ENV NEXT_PUBLIC_BACKEND_URL=${NEXT_PUBLIC_BACKEND_URL}

# Build production assets
RUN npm run build

FROM node:20-alpine AS runner
WORKDIR /app
ENV NODE_ENV=production

# Install only production deps
COPY package.json package-lock.json ./
RUN npm ci --omit=dev

# Copy build output and required runtime files
COPY --from=builder /app/.next ./.next
COPY --from=builder /app/public ./public
COPY --from=builder /app/next.config.ts ./next.config.ts
COPY --from=builder /app/middleware.ts ./middleware.ts

EXPOSE 3000
CMD ["npm", "run", "start"]