# Use Python 3.13 slim image as base
FROM python:3.13-slim AS builder

# Set working directory
WORKDIR /app

# Create and set pip cache directory
ENV PIP_CACHE_DIR=/root/.cache/pip

# Copy requirements file
COPY requirements.txt .

# Install Python dependencies with bind-mounted cache
RUN --mount=type=cache,id=pip,target=/root/.cache/pip \
    pip install --no-deps \
    --disable-pip-version-check \
    --target=/app/site-packages \
    -r requirements.txt

FROM python:3.13-slim

COPY --from=builder /app/site-packages /app/site-packages

# Create a non-root user
RUN adduser --disabled-password --gecos '' appuser

# Copy application code
COPY ./app /app/app
COPY ./generate_math_exercises.py /app/

ENV PYTHONPATH=/app/site-packages
ENV PATH=/app/site-packages/bin:/usr/local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

# Set working directory
WORKDIR /app

# Switch to non-root user
USER appuser

# Expose port
EXPOSE 8000

# Run the application
CMD ["uvicorn", "app.main:app", "--host", "0.0.0.0", "--port", "8000"]