# ---- frontend build ----
FROM node:20-alpine AS frontend
WORKDIR /fe
COPY frontend/package.json frontend/package-lock.json* ./
RUN npm install --no-audit --no-fund
COPY frontend/ ./
RUN npm run build

# ---- runtime ----
FROM python:3.11-slim
ENV PYTHONUNBUFFERED=1 \
    PIP_NO_CACHE_DIR=1 \
    HF_HOME=/tmp/hf \
    HF_HUB_CACHE=/tmp/hf

RUN apt-get update && apt-get install -y --no-install-recommends \
    git && rm -rf /var/lib/apt/lists/*

WORKDIR /app
COPY requirements.txt .
RUN pip install -r requirements.txt
# Force fresh resolution of git+main transformers each build so newly merged
# architectures (gemma4_assistant, qwen3_5_*, deepseek_v4, …) land quickly.
# Bumping TRANSFORMERS_REFRESH busts the Docker layer cache.
ARG TRANSFORMERS_REFRESH=2026-05-07-1
RUN pip install "transformers @ git+https://github.com/huggingface/transformers.git@main"

COPY backend/ ./backend/
COPY --from=frontend /fe/dist ./static/

EXPOSE 7860
CMD ["uvicorn", "backend.main:app", "--host", "0.0.0.0", "--port", "7860"]