import os
import sys
import random
import shutil
import hashlib
import re

def file_hash(filepath):
    hash_sha256 = hashlib.sha256()
    with open(filepath, 'rb') as f:
        for chunk in iter(lambda: f.read(65536), b''):
            hash_sha256.update(chunk)
    return hash_sha256.hexdigest()

def remove_duplicates(folder):
    hashes = {}
    removed = 0
    files = [f for f in os.listdir(folder) if os.path.isfile(os.path.join(folder, f))]
    for filename in files:
        path = os.path.join(folder, filename)
        h = file_hash(path)
        if h in hashes:
            os.remove(path)
            removed += 1
        else:
            hashes[h] = filename
    print(f"Removed duplicates: {removed}")

def rename_images(folder):
    files = [f for f in os.listdir(folder) if os.path.isfile(os.path.join(folder, f))]
    files_to_rename = [f for f in files]
    random.shuffle(files_to_rename)
    counter = 1
    existing = {f for f in files}
    for filename in files_to_rename:
        ext = os.path.splitext(filename)[1]
        while True:
            new_name = f"image{counter}{ext}"
            counter += 1
            if new_name not in existing:
                break
        src = os.path.join(folder, filename)
        dst = os.path.join(folder, new_name)
        os.rename(src, dst)
        existing.add(new_name)
    print(f"Renamed files: {len(files_to_rename)}")

def validate_split(folder, val_folder):
    files = [f for f in os.listdir(folder) if os.path.isfile(os.path.join(folder, f))]
    val_count = max(1, len(files) // 10)
    val_files = random.sample(files, val_count)
    os.makedirs(val_folder, exist_ok=True)
    for f in val_files:
        shutil.move(os.path.join(folder, f), os.path.join(val_folder, f))
    print(f"Moved {val_count} files to {val_folder} for validation.")

def main():
    if len(sys.argv) < 2:
        print("Usage: python utils.py <folder> [--dedup | --validate <folder> | --rename]")
        sys.exit(1)
    img_folder = sys.argv[1]
    if len(sys.argv) == 2:
        remove_duplicates(img_folder)
        rename_images(img_folder)
    elif sys.argv[2] == "--dedup":
        remove_duplicates(img_folder)
    elif sys.argv[2] == "--validate" and len(sys.argv) == 4:
        validate_split(img_folder, sys.argv[3])
    elif sys.argv[2] == "--rename":
        rename_images(img_folder)
    else:
        print("Invalid arguments.")

if __name__ == "__main__":
    main()