# Use a lightweight Python image
FROM python:3.9-slim

# Set working directory inside the container
WORKDIR /app

# Copy requirements first (for better caching)
COPY requirements.txt .

# Install dependencies
# 'gunicorn' must be in your requirements.txt or installed here
RUN pip install --no-cache-dir -r requirements.txt
RUN pip install gunicorn

# Copy the rest of the application
COPY . .

# Expose the internal port (Gunicorn default is 8000, or we choose one)
EXPOSE 5000

# Command to run production server
# -w 4: 4 worker processes
# -b 0.0.0.0:5000: Bind to all interfaces inside container on port 5000
CMD ["gunicorn", "--workers", "4", "--bind", "0.0.0.0:5000", "app:app"]