import sys
import cv2
from pathlib import Path

def laplace_edge_detection(image_path, output_path):
    """
    Opens an image, applies Laplace filtering for edge detection,
    and saves the resulting grayscale image.

    Args:
        image_path (str): Path to the input image file.
        output_path (str): Path to save the processed image.
    """

    try:
        # Open the image in grayscale mode
        img = cv2.imread(image_path, cv2.IMREAD_GRAYSCALE)

        if img is None:
            print(f"Error: Could not open or read image at {image_path}")
            return

        # Apply Laplace filter for edge detection
        laplace_kernel = np.array([[0, 1, 0],
                                   [1, -4, 1],
                                   [0, 1, 0]])  # Standard Laplace kernel
        laplace_filtered = cv2.filter2D(img, -1, laplace_kernel)

        # Convert to uint8 (grayscale 8-bit) and clip values to the valid range [0, 255]
        laplace_filtered = np.uint8(laplace_filtered)  # Important for saving correctly

        # Save the resulting image
        cv2.imwrite(output_path, laplace_filtered)

        print(f"Laplace edge detection complete. Image saved to {output_path}")

    except Exception as e:
        print(f"An error occurred: {e}")


if __name__ == "__main__":
    import numpy as np  # Import here, only if needed for the main execution
    input_path = sys.argv[1]
    output_path = sys.argv[2]
    laplace_edge_detection(input_path, output_path)