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

# Set the working directory
WORKDIR /app

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

# Install system dependencies needed by OpenCV and potentially others
RUN apt-get update && apt-get install -y --no-install-recommends \
    libgl1-mesa-glx \
    libglib2.0-0 \
    # Add any other system libs if needed during build
    && rm -rf /var/lib/apt/lists/*

# Install Python dependencies
# Use --no-cache-dir to reduce image size
RUN pip install --no-cache-dir -r requirements.txt

# Copy the rest of the application code
COPY . .

# Expose the port Flask runs on (default is 5000)
EXPOSE 5000

# Command to run the application
# Use gunicorn for a more robust server than Flask's default debug server
# Install gunicorn first
RUN pip install --no-cache-dir gunicorn
CMD ["gunicorn", "--bind", "0.0.0.0:5000", "app:app"]