import logging
import pprint

from pelican import signals

log = logging.getLogger(__name__)

def modify_feed(context, feed):
    articles = {}

    for article in context['articles']:
        if article.title in articles:
            raise Exception(f"Duplicate article title found: {article.title}")
        articles[article.title] = article

    for item in feed.items:
        item_title = item['title']
        article = articles.get(item_title)
        if not article:
            raise Exception(f"Article not found for title: {item_title}")

        if not hasattr(article, 'guid') or not article.guid:
            raise Exception(f"Article '{article.title}' is missing a guid.")

        item['unique_id'] = article.guid


def register():
    signals.feed_generated.connect(modify_feed)