import { Loops } from '.';

class EventDispatcher {

	private eventsRegister = {};

	public addListener(
		listenerKey: string,
		event: string|string[],
		callback: Function,
		singleAction = false
	): this {
		if (typeof event === 'string') {
			event = event.split(' ');
		}

		Loops.forEach(event, (eventName: string) => {
			if (!(eventName in this.eventsRegister)) {
				this.eventsRegister[eventName] = {};
			}

			this.eventsRegister[eventName][listenerKey] = {
				callback: callback,
				singleAction: singleAction
			};
		});

		return this;
	}

	public dispatchEvent(event: string|string[], parameters: any|null = []): this
	{
		if (!Array.isArray(parameters)) {
			parameters = [parameters];
		}

		if (typeof event === 'string') {
			event = event.split(' ');
		}

		Loops.forEach(event, (eventName: string) => {
			if (!(eventName in this.eventsRegister)) {
				return;
			}

			Loops.forEach(this.eventsRegister[eventName], (eventListener: any, eventListenerKey: string): void => {
				if (eventListener.singleAction) {
					this.removeListener(eventListenerKey, eventName);
				}

				eventListener.callback.apply(null, parameters);
			});
		});

		return this;
	}

	public removeListener(listenerKey: string, event: string|string[]): this
	{
		if (typeof event === 'string') {
			event = event.split(' ');
		}

		Loops.forEach(event, (eventName: string) => {
			delete this.eventsRegister[eventName][listenerKey];
		});

		return this;
	}

}

export default new EventDispatcher();