import { ErrorHandler, Injectable } from '@angular/core';
import { Application } from '../basecomponentmodel/Application';
import { smGetExceptionInstance } from './Exceptions';
import { UnhandledExceptionsFilterService } from './UnhandledExceptionsFilterService';

/**
 * Global exception handler to be used to report Exceptions to Application.Current.UnhandledException,
 * the selection of which errors will be reported can be handled through filterService.
 *
 * Errors will be handled over to the ErrorHandler.handleError too
 *
 * @export
 * @class UnhandledExceptionsHandler
 * @extends {ErrorHandler}
 */
@Injectable()
export class UnhandledExceptionsHandler extends ErrorHandler {
  /**
   * Creates an instance of UnhandledExceptionsHandler.
   * @param {UnhandledExceptionsFilterService} filterService service to be used to validate which
   * exceptions must be reported
   * @memberof UnhandledExceptionsHandler
   */
  constructor(private filterService: UnhandledExceptionsFilterService) {
    super();
  }

  /**
   * Handles the error
   *
   * @param {*} er
   * @memberof UnhandledExceptionsHandler
   */
  handleError(er: any) {
    super.handleError(er);

    if (
      Application?.Current?.UnhandledException?.fire &&
      this.filterService.shouldBeReported(er)
    ) {
      Application.Current.UnhandledException.fire([
        Application.Current,
        {
          ExceptionObject: smGetExceptionInstance(er),
          Handled: false,
        },
      ]);
    }
  }
}