FROM python:3.11-slim

# System deps
RUN apt-get update && apt-get install -y --no-install-recommends \
    gcc g++ curl \
    && rm -rf /var/lib/apt/lists/*

WORKDIR /app

# Install CPU-only PyTorch FIRST to prevent sentence-transformers
# pulling the massive CUDA-enabled build (~8GB → ~800MB)
RUN pip install --no-cache-dir \
    torch==2.3.1+cpu torchvision==0.18.1+cpu \
    --extra-index-url https://download.pytorch.org/whl/cpu

# Install remaining Python deps
COPY requirements.txt .
RUN pip install --no-cache-dir -r requirements.txt

# Copy application
COPY . .

# Streamlit config
RUN mkdir -p /app/.streamlit
COPY .streamlit/config.toml /app/.streamlit/config.toml

EXPOSE 8501

HEALTHCHECK CMD curl --fail http://localhost:8501/_stcore/health || exit 1

CMD ["streamlit", "run", "streamlit_app.py", \
     "--server.port=8501", \
     "--server.address=0.0.0.0", \
     "--server.headless=true", \
     "--browser.gatherUsageStats=false"]