# Using 3.12-slim is safer as many AI wheels for 3.13 are still unstable
FROM python:3.12-slim

# 1. Set environment variables
ENV PYTHONUNBUFFERED=1 \
    PYTHONDONTWRITEBYTECODE=1 \
    HOME=/home/user \
    PATH=/home/user/.local/bin:$PATH

# 2. Install essential system libraries
# libgomp1 is required by faiss-cpu
RUN apt-get update && apt-get install -y \
    build-essential \
    curl \
    git \
    libgomp1 \
    && rm -rf /var/lib/apt/lists/*

# 3. Create the mandatory HF non-root user
RUN useradd -m -u 1000 user
USER user
WORKDIR $HOME/app

# 4. Install requirements (requirements.txt is at repo root)
COPY --chown=user requirements.txt .
RUN pip install --no-cache-dir --upgrade pip && \
    pip install --no-cache-dir -r requirements.txt

# 5. Copy app files from src/
COPY --chown=user src/ .

# 6. Create persistent data directories
RUN mkdir -p data/faiss_index data/uploads

# 7. Expose the CORRECT Hugging Face port
EXPOSE 7860

# 8. Entrypoint with Port 7860 and XSRF fixes
ENTRYPOINT ["streamlit", "run", "app.py", \
    "--server.port=7860", \
    "--server.address=0.0.0.0", \
    "--server.enableXsrfProtection=false", \
    "--server.enableCORS=false", \
    "--server.headless=true", \
    "--server.fileWatcherType=none", \
    "--browser.gatherUsageStats=false"]