# Base image for Python
FROM python:slim

# Set the working directory
WORKDIR /app

# Copy and install dependencies
COPY app/requirements.txt requirements.txt
RUN pip install --no-cache-dir -r requirements.txt

# Copy application code
COPY app/ .

# Set default port environment variable
ENV PORT=5000

# Expose port (optional for documentation)
EXPOSE ${PORT}

# Start command using shell to allow env substitution
CMD ["sh", "-c", "exec python app.py --port=${PORT}"]