FROM python:3.13.5-slim

# Create non-root user (HF requirement)
RUN useradd -m -u 1000 user

# Set work directory
WORKDIR /home/user/app

# Copy requirements first (better cache)
COPY --chown=user:user requirements.txt .

# Install dependencies
RUN pip install --no-cache-dir -r requirements.txt

# --- THE FIX: CACHE THE MODEL DURING BUILD ---
# This command downloads the model into the Docker image's cache directory.
# This means your app will start instantly without downloading it on boot!
USER user
RUN python -c "from transformers import pipeline; pipeline('zero-shot-classification', model='valhalla/distilbart-mnli-12-3')"
# ---------------------------------------------

# Copy project files
COPY --chown=user:user . .

# Expose HF port
EXPOSE 7860

# Run Django with Gunicorn (PRODUCTION SAFE)
CMD sh -c "python manage.py migrate && gunicorn expensewise_api.wsgi:application --bind 0.0.0.0:7860"