FROM python:3.9-slim

# Set the working directory inside the container
WORKDIR /app

# Copy all files from the current directory to the container's working directory
COPY . .

# Install dependencies from the requirements file without using cache to reduce image size
RUN pip install --no-cache-dir --upgrade -r requirements.txt

# Expose the default port for Hugging Face Spaces or Docker runs
EXPOSE 7860

# Define the command to start the Flask application using Gunicorn
# - `-w 4`: 4 worker processes for concurrency
# - `-b 0.0.0.0:7860`: Binds to port 7860 on all interfaces
# - `app:churn_predictor_api`: Refers to the Flask app object inside app.py
CMD ["gunicorn", "-w", "4", "-b", "0.0.0.0:7860", "app:churn_predictor_api"]