import feedparser
import time
import requests
import secret_loader

SESSION = requests.Session()

secrets = secret_loader.SecretLoader()
WEBHOOK_URL = secrets.load_or_fail('WEBHOOK_URL')
FEED_URL = secrets.load_or_fail('FEED_URL')


def send_feed_notice(text: str):
    app_message = {'text': text}
    message_headers = {'Content-Type': 'application/json; charset=UTF-8'}
    response = requests.post(
        WEBHOOK_URL,
        headers=message_headers,
        json=app_message,
    )


def get_feed():
    response = SESSION.get(FEED_URL)
    return feedparser.parse(response.text)


def get_seen_entry_ids() -> set[str]:
    with open('output/entries_db.txt') as f:
        return f.read().split('\n')


def mark_as_sent(entry_id: str):
    with open('output/entries_db.txt', 'a') as f:
        f.write(entry_id)
        f.write('\n')


def check_for_new_updates():
    seen_entries = get_seen_entry_ids()
    feed = get_feed()
    for entry in reversed(feed.entries):
        if entry.id in seen_entries:
            continue

        msg = f'Feed <{feed.feed.link}|{feed.feed.title}> updated: <{entry.link}|{entry.title}>'
        send_feed_notice(msg)
        mark_as_sent(entry.id)


def main():
    while True:
        check_for_new_updates()
        time.sleep(600)

if __name__ == '__main__':
    main()