import os
import sys
import signal
import asyncio
from PIL import Image

SIGINT_COUNTER = 0

def sigint_handler(signum, frame):
    global SIGINT_COUNTER
    SIGINT_COUNTER += 1
    print()
    if SIGINT_COUNTER >= 3:
        print("Script force quit by user, exiting...")
        sys.exit(1)

def register_sigint_callback():
    signal.signal(signal.SIGINT, sigint_handler)

def validate_image(image_path, tags_path, width=None, height=None, convert_to_avif=False):
    new_path = None
    try:
        with Image.open(image_path) as img:
            save_kwargs = {}
            if isinstance(width, int) and width > 0 and isinstance(height, int) and height > 0:
                img = img.resize((width, height))
                new_path = image_path
            if convert_to_avif:
                import pillow_avif
                save_kwargs["quality"] = 50
                new_path = os.path.splitext(image_path)[0] + ".avif"
            if new_path is not None:
                img.load()
                img.save(new_path, **save_kwargs)
            else:
                img.verify()
        if new_path is not None and os.path.isfile(new_path) and os.path.realpath(new_path) != os.path.realpath(image_path):
            os.remove(image_path)
        return True
    except Exception as e:
        print(f"Error validating image {image_path}: {e}")
        try:
            os.remove(image_path)
        except Exception as e:
            print("Error deleting image file:", e)
        try:
            os.remove(tags_path)
            print(f"Deleted invalid image and tags files: {image_path}, {tags_path}")
        except Exception as e:
            print("Error deleting tags file:", e)
        try:
            if new_path is not None and os.path.isfile(new_path):
                os.remove(new_path)
                print("Deleted invalid new image file:", new_path)
        except Exception as e:
            print("Error deleting new image file:", e)
    return False

async def submit_validation(thread_pool, image_path, tags_path, width=None, height=None, convert_to_avif=False):
    return await asyncio.wrap_future(thread_pool.submit(validate_image, image_path, tags_path, width, height, convert_to_avif))

def get_existing_image_tags_set(image_dir):
    if not os.path.isdir(image_dir):
        return set()
    existing_image_tags = set()
    for path in os.listdir(image_dir):
        image_id, ext = os.path.splitext(path)
        if ext != ".txt":
            continue
        existing_image_tags.add(image_id)
    return existing_image_tags