# Use Python 3.11 (Stable for AI libraries)
FROM python:3.11-slim

# Set the working directory inside the container
WORKDIR /app

# Install system dependencies required for OpenCV
# (Even 'headless' OpenCV sometimes needs these basic libs)
RUN apt-get update && apt-get install -y \
    libglib2.0-0 \
    libsm6 \
    libxext6 \
    libxrender-dev \
    && rm -rf /var/lib/apt/lists/*

# Copy requirements first (to cache dependencies)
COPY requirements.txt .

# Install Python dependencies
RUN pip install --no-cache-dir -r requirements.txt

# Copy the rest of your application code
COPY . .

# Expose the port your app runs on
EXPOSE 5000

# Command to run the app using Gunicorn (Production server)
# "app:app" means "look in app.py for the 'app' variable"
CMD ["gunicorn", "--bind", "0.0.0.0:5000", "--timeout", "120", "app:app"]