# ---------- BUILD STAGE ----------
FROM node:20 AS builder
WORKDIR /app

# Copy only package files first
COPY package*.json ./

# Install ALL deps (dev + prod)
RUN npm install

# Copy source code
COPY . .

# Build Next.js
RUN npm run build

# Remove devDependencies, keep only production deps
RUN npm prune --omit=dev


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

# Copy production deps only
COPY --from=builder /app/node_modules ./node_modules

# Copy minimal runtime files
COPY --from=builder /app/package*.json ./
COPY --from=builder /app/.next ./.next
COPY --from=builder /app/next.config.ts ./next.config.ts

# Ownership fix (optional but recommended)
RUN chown -R node:node /app

# Switch to built-in non-root user
USER node

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