import {FilterMetadata} from './FilterMetadata';
import {DependencyRegistry} from '../di/DependencyRegistry';
import {Klass} from '../core/Klass';
import {HandlerRegistry} from './HandlerRegistry';

export class FilterRegistry {

  private static _filters: Map<Function, FilterMetadata> = new Map();

  public static filters = FilterRegistry._filters;

  public static registerFilter(type: Function) {

    DependencyRegistry.registerComponent(type as Klass);
    const filterMetadata = this.getFilter(type);

    const handlerMetadata = HandlerRegistry.getHandler(type, 'use');
    filterMetadata.handler = handlerMetadata;
  }

  public static getFilter(type: Function) {

    let filterMetadata = this._filters.get(type);

    if (typeof filterMetadata === 'undefined') {
      filterMetadata = new FilterMetadata(type);
      this._filters.set(type, filterMetadata);
    }

    return filterMetadata;
  }

}