import AppDispatcher from '../dispatcher/AppDispatcher';
import {EventEmitter} from 'events';
import AppConstants from '../constants/AppConstants';

let _articles = [];

function _addArticle(article) {
    _articles.push(article);
}

function _removeArticle(id) {
    delete _articles[id];
}

class ArticleStore extends EventEmitter {

    constructor() {
        super();
        this.dispatchToken = AppDispatcher.register(this.dispatcherCallback.bind(this))
    }

    getAll() {
        return _articles;
    }

    emitChange() {
        this.emit(CHANGE_EVENT);
    }

    addChangeListener(callback) {
        this.on(CHANGE_EVENT, callback);
    }

    removeChangeListener(callback) {
        this.removeListener(CHANGE_EVENT, callback);
    }

    dispatcherCallback(action) {
        switch (action.type) {
            case ActionTypes.ARTICLE_CREATE:
                _addArticle(action.article);
                this.emitChange();
                break;
            case ActionTypes.ARTICLE_DELETE:
                _removeArticle(action.articleId);
                this.emitChange();
                break;
        }
        return true;
    }
}

export default new ArticleStore();