import logging


def extract_search_filters(result_set):
    """
    Returned object should look something like:

    {
        "singles": [],  # non tree tags
        "entry_1": [ 'tag1', 'tag2' ],
        "entry_2": [ 'tag1', 'tag2' ],
    }
    """
    filter_dict = {
        'singles': set(),
    }
    for item in result_set:
        try:
            # extract tags
            tags = item.tags.all()
            for tag in tags:
                if len(tag.name.split('/')) == 1:
                    filter_dict['singles'].add(tag.name)
                else:
                    # set penultimate tag as header
                    chunks = tag.name.split('/')
                    header = chunks[-2]
                    name = chunks[-1]
                    # check if
                    entry = filter_dict.get(header)
                    if entry is None:
                        filter_dict[header] = set()
                    filter_dict[header].add(name)
            # extract attributes
            attributes = item.attributes.all()
            for tag in attributes:
                if len(tag.name.split('/')) == 1:
                    filter_dict['singles'].add(tag.name)
                else:
                    # set penultimate tag as header
                    chunks = tag.name.split('/')
                    header = chunks[-2]
                    name = chunks[-1]
                    # check if
                    entry = filter_dict.get(header)
                    if entry is None:
                        filter_dict[header] = set()
                    filter_dict[header].add(name)
        except Exception as e:
            logging.error(f'Extacting filters for {item}')
    return filter_dict