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# ---- Stage 1: Build ----
# Mirrors BRIDGE Modul-E's proven HF pattern (node:20-alpine).
FROM node:20-alpine AS builder
WORKDIR /app

# Vite bakes VITE_* vars in at BUILD time — pass them as build args.
# Empty values keep the demo fallback UI.
ARG VITE_SUPABASE_URL=""
ARG VITE_SUPABASE_ANON_KEY=""
ARG VITE_API_URL=""
ENV VITE_SUPABASE_URL=$VITE_SUPABASE_URL \
    VITE_SUPABASE_ANON_KEY=$VITE_SUPABASE_ANON_KEY \
    VITE_API_URL=$VITE_API_URL

# Install dependencies first (layer caching).
# NOTE: only package.json is copied (no lockfile): the Windows-generated
# lockfile pins win32-only optional native deps (rollup) which break Linux
# builds — npm/cli bug #4828. Dependencies resolve fresh on Alpine/musl.
COPY package.json ./
RUN npm install --no-audit --no-fund

# Copy source and build frontend + bundle server (dist/server.cjs).
COPY . .
RUN npm run build

# ---- Stage 2: Production ----
FROM node:20-alpine AS production
WORKDIR /app

# HF Spaces routes to 7860 — the server MUST default to it (see server.ts).
ENV NODE_ENV=production \
    PORT=7860

# Install production-only dependencies (esbuild, vitest, typescript excluded).
COPY package.json ./
RUN npm install --omit=dev && npm cache clean --force

# Copy the built output from builder stage.
COPY --from=builder /app/dist ./dist

EXPOSE 7860

HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
  CMD wget -qO- http://127.0.0.1:7860/api/health >/dev/null 2>&1 || exit 1

CMD ["node", "dist/server.cjs"]