src/components/presenters/signup-presenter.js

import BasePresenter from './presenter';
import { SignUpM } from '../models/export-models';

/**
 * Class for the SignUp presenter and view
 * @extends BasePresenter
 */
class SignUpPresenter extends BasePresenter {
	/**
	 * Creates an instance of LoginPresenter
	 *
	 * @constructor
	 * @param {Object} view - An instance of a view class
	 */
	constructor(view) {
		super();
		this.view = view;
		this.callback = this.defaultCallback;
		SignUpM.subscribe(this);
	}

	defaultCallback = () => {
		// Stub
	}

	setCallback = (callback) => {
		this.callback = callback;
	}
	
	/**
	 * Updates the bike model with new data.
	 *
	 * @param {Object} newData - New data to update the model's data with, including username and password for sign up.
	 */
	update = (newData, onSuccess) => {
		this.setCallback(onSuccess);
		SignUpM.update(newData);
	};

	/**
	 * Called when the model is updated with new data. Refreshes the state of the view.
	 * Method is supplied with the data to add.
	 * Better way to refresh the state?
	 *
	 * @param {Object} newData - New data to add.
	 */
	onUpdated = (newData) => {
		this.callback(newData);
	};


	/**
	 * Gets the data from the model and returns it to the caller.
	 *
	 * @return {Object} Data from the model.
	 */
	getData = () => {
		return SignUpM.get().data;
	};

	/**
	 * Called after user click the login button, before presenter sending data to the login model
	 * Check if the input is valid
	 * @param {Object} username - the username that user entered in the view
	 * @param {Object} password - the password that user entered in the view
	 */
	checkInput = (username, password, reportError) => {
		result=true;
		//1. check if it is empty
		if ((username=='') || (password=='')) {
			reportError('Account name and password can not be empty')
			result = false;
		}
		//2. check the length
		return result;
	 };

 	/**
	 * If the view or presenter is destroyed, unsubscribe the presenter from the model.
	 */
	onDestroy = () => {
		SignUpM.unsubscribe(this);
	};
};

export default SignUpPresenter;