# Flux Studio — Zero GPU
# Hugging Face Docker Space · free CPU tier · no GPU needed.
# All image generation is proxied to the Black Forest Labs FLUX API.

# Pinned Node LTS (as required: explicit Node major, reproducible builds).
FROM node:20-slim

# Hugging Face Spaces runs containers as user 1000.
RUN useradd -m -u 1000 user \
 && mkdir -p /app && chown -R user:user /app

USER user
WORKDIR /app

# Install dependencies first for better layer caching.
# package-lock.json is committed, so `npm ci` is fully reproducible.
COPY --chown=user:user package.json package-lock.json ./
RUN npm ci --omit=dev && npm cache clean --force

# App code.
COPY --chown=user:user . .

# Build-time verification (fails the image build if the app is broken).
RUN npm run build

ENV NODE_ENV=production \
    PORT=7860 \
    HOST=0.0.0.0

EXPOSE 7860

# BFL_API_KEY is injected by Hugging Face at runtime (Space Secrets):
#   BFL_API_KEY            (required for generation; app refuses generation without it)
#   BFL_MODEL_ID           (default: flux-2-pro-preview)
#   BFL_FALLBACK_MODEL_ID  (default: flux-2-klein-9b)
#   BFL_API_BASE_URL       (default: https://api.bfl.ai)

CMD ["node", "server.mjs"]