import os
from PIL import Image
import glob


def get_latest_screenshot(directory, ext='jpg'):
    """Get the latest screenshot file from the given directory. Returns None if none found."""
    if not os.path.isdir(directory):
        return None
    pattern = os.path.join(directory, f'*.{ext}')
    list_of_files = glob.glob(pattern)
    if not list_of_files:
        return None
    latest_file = max(list_of_files, key=os.path.getctime)
    return latest_file


def process_image(image_path):
    """Process the image to decide if it's dark or light. Returns 'open', 'closed' or 'unknown'."""
    if not image_path or not os.path.isfile(image_path):
        return 'unknown'
    try:
        with Image.open(image_path) as img:
            img = img.convert('RGB')
            # shrink to 2x2 to average quickly
            img = img.resize((2, 2))
            pixels = list(img.getdata())
            # average each channel
            avg = [sum(ch) / len(pixels) for ch in zip(*pixels)]
            luminance = sum(avg) / 3.0
            return 'closed' if luminance < 128 else 'open'
    except Exception:
        return 'unknown'


def get_brightness(image_path):
    """Return the average brightness (0-255) of the image, or None on error."""
    if not image_path or not os.path.isfile(image_path):
        return None
    try:
        with Image.open(image_path) as img:
            img = img.convert('L')
            # sample more pixels for a smoother average
            img = img.resize((16, 16))
            pixels = list(img.getdata())
            if not pixels:
                return None
            return sum(pixels) / len(pixels)
    except Exception:
        return None

# Directory where the screenshots are stored
screenshot_directory = '/var/lib/motion/'

# Get the latest screenshot
latest_screenshot = get_latest_screenshot(screenshot_directory)

# Process the image and determine hackspace status
hackspace_status = process_image(latest_screenshot)
print(f"The hackspace is {hackspace_status}.")