import {Naja} from '../Naja';
import {InteractionEvent} from './UIHandler';
import {onDomReady} from '../utils';

export class FormsHandler {
	public netteForms: any;

	public constructor(private readonly naja: Naja) {
		naja.addEventListener('init', this.initialize.bind(this));
		naja.uiHandler.addEventListener('interaction', this.processForm.bind(this));
	}

	private initialize(): void {
		onDomReady(() => this.initForms(window.document.body));
		this.naja.snippetHandler.addEventListener('afterUpdate', (event) => {
			const {snippet} = event.detail;
			this.initForms(snippet);
		});
	}

	private initForms(element: Element): void {
		const netteForms = this.netteForms || (window as any).Nette;
		if ( ! netteForms) {
			return;
		}

		if (element instanceof HTMLFormElement) {
			netteForms.initForm(element);
			return;
		}

		const forms = element.querySelectorAll('form');
		forms.forEach((form) => netteForms.initForm(form));
	}

	private processForm(event: InteractionEvent): void {
		const {element, originalEvent} = event.detail;

		const isForm = element instanceof HTMLFormElement;
		const isSubmitter = (element instanceof HTMLInputElement || element instanceof HTMLButtonElement) && element.form;

		if (isSubmitter) {
			element.form['nette-submittedBy'] = element;
		}

		const netteForms = this.netteForms || (window as any).Nette;
		if ((isForm || isSubmitter) && netteForms && ! netteForms.validateForm(element)) {
			originalEvent?.stopImmediatePropagation();
			originalEvent?.preventDefault();
			event.preventDefault();
		}
	}
}