import { SubscriptionEvent } from '../utils/SubscriptionEvent';

/**
 * Represents a Command that can be executed.
 *
 * @export
 * @interface ICommand
 * @wInterface System.Windows.Input.ICommand
 */
export interface ICommand {
  /**
   * Event trigerred when `CanExecute` changes its value.
   *
   * @type {SubscriptionEvent<any>}
   * @memberof ICommand
   */
  CanExecuteChanged: SubscriptionEvent<any>;

  /**
   * Query if the command can be executed.
   *
   * @param {*} [parameter]
   * @return {*}  {boolean} `true` the command can be executed, `false` otherwise.
   * @memberof ICommand
   */
  CanExecute(parameter?: any): boolean;

  /**
   * Executes the command if it can be executed.
   *
   * @param {*} [parameter]
   * @memberof ICommand
   */
  Execute(parameter?: any): void;
}