const appendTagList = (articleTags, article) => {
    const tagList = articleTags.map((tag) => tag.tagName);

    if (!article) return tagList;
    delete article.dataValues.tagLists; //articleTags
    article.dataValues.tagList = tagList;
};

const appendFavorites = async (loggedUser, article) => {
    console.log("article: ", article);
    //const favorited = await article.hasUser(loggedUser ? loggedUser : null);
    const favorited = await article.hasArticleFavoriteUsers(loggedUser ? loggedUser : null);
    article.dataValues.favorited = loggedUser ? favorited : false;

    //const favoritesCount = await article.countUsers();
    const favoritesCount = await article.countFavorites();
    article.dataValues.favoritesCount = favoritesCount;
};

const appendFollowers = async (loggedUser, toAppend) => {
    // If toAppend has an author (it's an Article)
    if (toAppend?.author) {
        await appendArticleFollowers(loggedUser, toAppend);
    } else if (toAppend?.id && toAppend?.hasUserIdUserFollower) {
        // toAppend is a User model
        await appendUserFollowers(loggedUser, toAppend);
    }
};

const appendArticleFollowers = async (loggedUser, article) => {
    // Append follower info to an article's author
    const author = await article.getAuthor();
    const following = loggedUser ? await author.hasUserIdUserFollower(loggedUser) : false;
    article.author.dataValues.following = following;

    const followersCount = await author.countFollowers();
    article.author.dataValues.followersCount = followersCount;
};

const appendUserFollowers = async (loggedUser, user) => {
    // Append follower info to a user
    const following = loggedUser ? await user.hasUserIdUserFollower(loggedUser) : false;
    user.dataValues.following = following;

    const followersCount = await user.countFollowers();
    user.dataValues.followersCount = followersCount;
};

module.exports = { appendTagList, appendFavorites, appendFollowers, appendArticleFollowers, appendUserFollowers };