import sys
from PIL import Image

def split_image(image_path, output_prefix):
    try:
        img = Image.open(image_path)
        width, height = img.size
        
        target_height = width // 3
        if target_height > height:
            target_height = height
            target_width = height * 3
            left = (width - target_width) // 2
            top = 0
            right = left + target_width
            bottom = height
        else:
            target_width = width
            left = 0
            top = (height - target_height) // 2
            right = width
            bottom = top + target_height

        img_cropped = img.crop((left, top, right, bottom))
        
        sq_size = target_width // 3
        
        for i in range(3):
            box = (i * sq_size, 0, (i + 1) * sq_size, sq_size)
            part = img_cropped.crop(box)
            part.save(f"{output_prefix}_{i+1}.png")
            
        print("Success")
    except Exception as e:
        print(f"Error: {str(e)}")

if __name__ == "__main__":
    if len(sys.argv) != 3:
        print("Usage: split_image.py <input_img> <output_prefix>")
    else:
        split_image(sys.argv[1], sys.argv[2])