"""Helper functions for YouTube2FreshRSS."""

import json


def determine_additions(subscriptions, feed_urls):
    """Determine which feeds need to be added to FreshRSS."""
    additions = []

    for subscription in subscriptions:
        if subscription['url'] not in feed_urls:
            additions.append(subscription)

    return additions


def determine_deletions(feeds, subscriptions):
    """Determine which feeds need to be deleted from FreshRSS."""
    urls = []

    for feed in feeds:
        if feed not in subscriptions:
            urls.append(feed)

    return urls


def read_config_file():
    """Read secrets JSON file."""
    with open("config.json", "rb") as config_file:
        data = json.load(config_file)

    return data