# Use an official Python runtime as a parent image
FROM python:3.9-slim

# Set the working directory in the container
WORKDIR /code

# Copy the requirements file into the container
COPY requirements.txt .

# Install any needed packages specified in requirements.txt
# Using --no-cache-dir reduces image size
RUN pip install --no-cache-dir --upgrade pip && \
    pip install --no-cache-dir -r requirements.txt

# Copy the Flask application code into the container
COPY app.py .

# Make port 7860 available to the world outside this container
# This is the port Hugging Face Spaces expects by default for web apps
EXPOSE 7860

# Define environment variable for Flask (optional but good practice)
# ENV FLASK_APP=app.py # Not strictly needed when using `flask run` like below

# Command to run the application when the container launches
# Use 'flask run' for development/simple cases. For production, gunicorn is often preferred.
CMD ["flask", "run", "--host=0.0.0.0", "--port=7860"]