# ─── Stage 0: Base ────────────────────────────────────────────────────────────
FROM node:20-alpine AS base
WORKDIR /app

# ─── Stage 1: Dependencies ───────────────────────────────────────────────────
FROM base AS deps
COPY package*.json ./
RUN npm ci

# ─── Stage 2: Builder ─────────────────────────────────────────────────────────
FROM deps AS builder
COPY . .
RUN npm run build
RUN npm ci --omit=dev --ignore-scripts

# ─── Stage 3: Production ──────────────────────────────────────────────────────
FROM base AS production
ENV NODE_ENV=production
COPY --from=builder --chown=appuser:appgroup /app/dist ./dist
COPY --from=builder --chown=appuser:appgroup /app/node_modules ./node_modules
COPY --from=builder --chown=appuser:appgroup /app/package.json ./package.json
EXPOSE 3000
CMD ["node", "dist/main"]