import base64
from django.conf import settings
from django.core.files.base import ContentFile


def decode_base64(my_str, upload_to=None):
    if "data:" in my_str:
        my_str = my_str[my_str.index("base64,")+7:]
        if not upload_to:
            ext = my_str.split('/')[-1]
            return ContentFile(base64.b64decode(my_str), name='temp.' + ext)
        path = "%s/%s" % (settings.MEDIA_ROOT, upload_to)
        url = "%s%s" % (settings.MEDIA_URL, upload_to)
        with open(path, "wb") as fh:
            fh.write(base64.b64decode(my_str))
        return url
    return my_str


def get_real_name(array, elem):
    for i, j in array:
        if i and (i == elem or j == elem):
            return i