# Use a lightweight official Python runtime
FROM python:3.10-slim

# Set environment variables
ENV PYTHONUNBUFFERED=1 \
    PYTHONDONTWRITEBYTECODE=1 \
    PORT=7860 \
    HOME=/home/user \
    PATH=/home/user/.local/bin:$PATH

# Create a non-root user (Hugging Face best practice)
RUN useradd -m -u 1000 user

# Install system dependencies required by OpenCV / YOLOv8
RUN apt-get update && apt-get install -y --no-install-recommends \
    libgl1 \
    libglib2.0-0 \
    && rm -rf /var/lib/apt/lists/*

# Set working directory
WORKDIR /code

# Copy requirements file first to leverage Docker cache
# Change ownership to the new user
COPY --chown=user:user requirements.txt /code/requirements.txt

# Switch from root to the new user before installing python packages
USER user

# Install CPU-specific PyTorch to keep image size small and speed up builds
RUN pip install --no-cache-dir --upgrade pip && \
    pip install --no-cache-dir torch torchvision --index-url https://download.pytorch.org/whl/cpu && \
    pip install --no-cache-dir -r requirements.txt

# Copy the rest of the application files with correct ownership
COPY --chown=user:user . /code

# Expose the default port for Hugging Face Spaces
EXPOSE 7860

# Run the application
CMD ["python", "app.py"]