import { EventEmitter } from '@angular/core';
import { EditorComponent } from '../editor.component';
import { validEvents } from '../Events';

const bindHandlers = (ctx: EditorComponent, editor: any): void => {
  validEvents.forEach((eventName) => {
    const eventEmitter: EventEmitter<any> = ctx[eventName];
    editor.on(eventName.substring(2), (event: any) => ctx.ngZone.run(() => eventEmitter.emit({ event, editor })));
  });
};

let unique = 0;

const uuid = (prefix: string): string => {
  const date = new Date();
  const time = date.getTime();
  const random = Math.floor(Math.random() * 1000000000);

  unique++;

  return prefix + '_' + random + unique + String(time);
};

const isTextarea = (element?: Element): element is HTMLTextAreaElement => {
  return typeof element !== 'undefined' && element.tagName.toLowerCase() === 'textarea';
};

const normalizePluginArray = (plugins?: string | string[]): string[] => {
  if (typeof plugins === 'undefined' || plugins === '') {
    return [];
  }

  return Array.isArray(plugins) ? plugins : plugins.split(' ');
};

const mergePlugins = (initPlugins: string | string[], inputPlugins?: string | string[]) =>
  normalizePluginArray(initPlugins).concat(normalizePluginArray(inputPlugins));

// tslint:disable-next-line:no-empty
const noop: (...args: any[]) => void = () => { };

const isNullOrUndefined = (value: any): value is null | undefined => value === null || value === undefined;

export {
  bindHandlers,
  uuid,
  isTextarea,
  normalizePluginArray,
  mergePlugins,
  noop,
  isNullOrUndefined
};