# Use an official Python runtime as a parent image
FROM python:3.11-slim

# Set environment variables
ENV PYTHONDONTWRITEBYTECODE 1
ENV PYTHONUNBUFFERED 1
ENV FLASK_APP=server.py
ENV FLASK_ENV=production

# Set the working directory in the container
WORKDIR /app

# Install system dependencies required for some Python packages
RUN apt-get update && apt-get install -y --no-install-recommends \
    gcc \
    python3-dev \
    && rm -rf /var/lib/apt/lists/*

# Copy requirements first to leverage Docker cache
COPY requirements.txt .

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

# Create a non-root user and switch to it
RUN groupadd -r appuser && useradd -r -g appuser appuser
RUN chown -R appuser:appuser /app
USER appuser

# Copy the rest of the application
COPY --chown=appuser:appuser . .

# Expose the port the app runs on
EXPOSE 7860

# Command to run the application
CMD ["gunicorn", "--bind", "0.0.0.0:7860", "--workers", "4", "--threads", "2", "server:app"]