import { createLogger } from '../debug/create-logger';
import { LOG_LEVEL } from '../debug/levels';

export interface MyCallback<Argument> {
	displayName?: string;
	
	(param: Argument): void|undefined|boolean;
}

const sill = createLogger(LOG_LEVEL.SILLY, 'cb-list');

export class CallbackList<Argument> {
	protected list: MyCallback<Argument>[] = [];
	
	add(item: MyCallback<Argument>, name?: string) {
		if (name) {
			Object.defineProperty(item, 'displayName', {
				value: name,
				enumerable: true,
				writable: true,
				configurable: true,
			});
		}
		return this.list.push(item);
	}
	
	remove(item: MyCallback<Argument>) {
		const found = this.list.indexOf(item);
		if (found !== -1) {
			return this.list.splice(found, 1);
		}
	}
	
	run(argument: Argument) {
		return this.list.some((cb, i) => {
			let ret = cb(argument);
			ret = ret === undefined? true : !!ret;
			sill('%s/%s (%s)- %s', i, this.list.length, cb.displayName || cb.name, ret);
			return ret;
		});
	}
}