namespace folksprak.words.pages
{
	
	/**
	 */
	export abstract class class_page
	{
		
		/**
		 */
		public abstract render
		(
		) : HTMLElement
		;
		
	}
	
	
	/**
	 */
	var _pool : {[name : string] : ()=>class_page} = {};
	
	
	/**
	 */
	export function register
	(
		name : string,
		factory : ()=>class_page
	) : void
	{
		if (_pool.hasOwnProperty(name))
		{
			throw (new Error('page "' + name + '" already registered'));
		}
		else
		{
			_pool[name] = factory;
		}
	}
	
	
	/**
	 */
	export function load
	(
		name : string,
		parameters : any
	) : void
	{
		if (! _pool.hasOwnProperty(name))
		{
			throw (new Error('page "' + name + '" not found'));
		}
		else
		{
			const page : class_page = _pool[name]();
			let dom_target : HTMLElement = document.querySelector('#main');
			dom_target.textContent = '';
			dom_target.appendChild(page.render());
		}
	}
	
	
	/**
	 */
	export function setup
	(
	) : Promise<void>
	{
		register('portal', () => new class_page_portal());
		return Promise.resolve<void>(undefined);
	}
	
}