from pathlib import Path
import hashlib

FOLDERS = [
    Path("./data/appropriate"),
    Path("./data/inappropriate"),
]

EXTENSIONS = {".png", ".webp"}

def file_hash(path, chunk_size=8192):
    h = hashlib.sha256()
    with open(path, "rb") as f:
        while chunk := f.read(chunk_size):
            h.update(chunk)
    return h.hexdigest()

def get_duplicate_name(folder, suffix):
    counter = 1
    while True:
        candidate = folder / f"duplicate_{counter}{suffix}"
        if not candidate.exists():
            return candidate
        counter += 1

def process_folder(folder: Path):
    if not folder.is_dir():
        print(f"Skipping invalid folder: {folder}")
        return

    files = sorted(
        [f for f in folder.iterdir() if f.is_file() and f.suffix.lower() in EXTENSIONS],
        key=lambda f: f.name.lower()
    )

    seen_hashes = {}
    for f in files:
        h = file_hash(f)
        if h in seen_hashes:
            print("found duplicate")
            f.unlink()
        else:
            seen_hashes[h] = f

    files = sorted(
        [f for f in folder.iterdir() if f.is_file() and f.suffix.lower() in EXTENSIONS],
        key=lambda f: f.name.lower()
    )

    for f in files:
        if f.stem.isdigit():
            new_path = get_duplicate_name(folder, f.suffix.lower())
            f.rename(new_path)

    files = sorted(
        [f for f in folder.iterdir() if f.is_file() and f.suffix.lower() in EXTENSIONS],
        key=lambda f: f.name.lower()
    )

    for i, f in enumerate(files, start=1):
        new_path = folder / f"{i}{f.suffix.lower()}"
        f.rename(new_path)

    print(f"{folder}: {len(files)} files kept and renamed")

for folder in FOLDERS:
    process_folder(folder)