import os
import random

def create_path(IMGS_PATH, list_new_files):
    '''
    Util function to add the file path of all the images to the list of names of the selected 
    images that will form the valid ones.
    '''
    file_path, name = os.path.split(
        IMGS_PATH[0])  # we pick only one element of the list
    output = [os.path.join(file_path, element) for element in list_new_files]

    return output

def common_member(a, b):
    '''
    Returns true if the two lists (valid and training) have a common element.
    '''
    a_set = set(a)
    b_set = set(b)
    if (a_set & b_set):
        return True
    else:
        return False


def random_sort_pairs(list1, list2):
    '''
    This function makes the same random sort to each list, so that they are sorted and the pairs are maintained.
    '''
    # Combine the lists
    combined = list(zip(list1, list2))

    # Shuffle the combined list
    random.shuffle(combined)

    # Unzip back into separate lists
    list1[:], list2[:] = zip(*combined)

    return list1, list2

def flatten_list_comprehension(matrix):
    return [item for row in matrix for item in row]

def check_paths(list_of_lists):
    '''
    check if all the image routes are correct
    '''
    paths = flatten_list_comprehension(list_of_lists)
    trues = [os.path.isfile(file) for file in paths]
    counter = 0
    for true, path in zip(trues, paths):
        if true != True:
            print('Non valid route!', path)
            counter +=1