import { Action } from '@ngrx/store';
import { NavigationExtras } from '@angular/router';

/**
 * For each action type in an action group, make a simple
 * enum object for all of this group's action types.
 */
export enum RouterActionTypes {
    Go = '[Router] Go',
    Back = '[Router] Back',
    Forward = '[Router] Forward'
}

/**
 * Every action is comprised of at least a type and an optional
 * payload. Expressing actions as classes enables powerful
 * type checking in reducer functions.
 */

interface RoutePayload {
        path: any[];
        query?: object;
        extras?: NavigationExtras;
}

export class Go implements Action {
    readonly type = RouterActionTypes.Go;

    constructor(public payload: RoutePayload) {}

}

export class Back implements Action {
    readonly type = RouterActionTypes.Back;

}

export class Forward implements Action {
    readonly type = RouterActionTypes.Forward;

}

/**
 * Export a type alias of all actions in this action group
 * so that reducers can easily compose action types
 */
export type RouterActions
                        = Go
                        | Back
                        | Forward;