import { Injectable } from '@angular/core';

/**
 * Default filter service to be used in UnhandledExceptionsHandler to filter which errors should
 * be notified through Application?.Current?.UnhandledException.
 *
 * This implementation will consider to report any error of type Exception or any error which is
 * not an angular platform error identifed by 'NGXXXX:'
 *
 * A custom service can be registered to replace this one.
 *
 * @usageNotes
 * ### Example
 *
 * ```
 * class MyFilterService implements UnhandledExceptionsFilterService {
 *   public shouldBeReported(error: any): boolean {
 *     return <customConditions>
 *   }
 * }
 *
 * @NgModule({
 *   providers: [{provide: UnhandledExceptionsFilterService, useClass: MyFilterService}]
 * })
 * class MyModule {}
 * ```
 *
 * @export
 * @class UnhandledExceptionsFilterService
 */
@Injectable()
export class UnhandledExceptionsFilterService {
  /**
   * Test if an error should be notified
   *
   * @param {*} er
   * @return {*}  {boolean}
   * @memberof UnhandledExceptionsFilterService
   */
  public shouldBeReported(er: any): boolean {
    //Angular exceptions will be ignored
    return !!er && !/^\s*NG\d+:/g.test(er?.message);
  }
}