FROM python:3.11-slim

WORKDIR /app

# System deps for sentence-transformers (tokenizers uses Rust bindings)
RUN apt-get update && apt-get install -y --no-install-recommends \
    build-essential \
    && rm -rf /var/lib/apt/lists/*

COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# Pre-download models so first request isn't slow on HF Spaces
RUN python -c "\
from sentence_transformers import SentenceTransformer; \
from transformers import T5Tokenizer, pipeline; \
SentenceTransformer('all-MiniLM-L6-v2'); \
tok = T5Tokenizer.from_pretrained('t5-small'); \
pipe = pipeline('text-classification', model='vectara/hallucination_evaluation_model', tokenizer=tok, trust_remote_code=True); \
pipe(['test document test response'])"

COPY knowledge/ ./knowledge/
COPY backend/   ./backend/
COPY ui/        ./ui/

WORKDIR /app/backend

# HF Spaces requires port 7860
ENV PORT=7860
EXPOSE 7860

CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]