import { Article } from "article/domain/articleEntity";
import { ArticleStore } from "article/domain/articleStore";


class FetchArticleUseCase {
    /* ------------------------------ Dependencies ------------------------------ */
    _fetchArticleCallback: (id: string) => Promise<Article | null>;
    _store: ArticleStore;
    /* -------------------------------------------------------------------------- */
    constructor(
        fetchArticle: (id: string) => Promise<Article | null>,
        store: ArticleStore,
    ) {
        this._fetchArticleCallback = fetchArticle;
        this._store = store;
    }
    /* ----------------------------- Implementation ----------------------------- */
    async call(id: string): Promise<Article | null> {
        return this._fetchArticleCallback(id).then((article) => {
            if (article != null) {
                this._store.setArticle(article);
            }
            return article;
        })
    }
    /* -------------------------------------------------------------------------- */
}

export { FetchArticleUseCase };