import { StatePart } from './smartstate.classes.statepart.js';

/**
 * Context object passed to action definitions, enabling safe nested dispatch.
 * Use `context.dispatch()` to dispatch sub-actions inline (bypasses the mutation queue).
 * Direct `statePart.dispatchAction()` from within an action will deadlock.
 */
export interface IActionContext<TStateType> {
  dispatch<T>(action: StateAction<TStateType, T>, payload: T): Promise<TStateType>;
}

export interface IActionDef<TStateType, TActionPayloadType> {
  (stateArg: StatePart<any, TStateType>, actionPayload: TActionPayloadType, context?: IActionContext<TStateType>): Promise<TStateType>;
}

/**
 * an actionmodifier for the state
 */
export class StateAction<TStateType, TActionPayloadType> {
  constructor(
    public statePartRef: StatePart<any, any>,
    public actionDef: IActionDef<TStateType, TActionPayloadType>
  ) {}

  public trigger(payload: TActionPayloadType): Promise<TStateType> {
    return this.statePartRef.dispatchAction(this, payload);
  }
}