wongjiahau/ttap-web

const random = require("lodash.random");
import { IMasterState, MasterStateAction } from "./../reducers/masterState";

export class GoToRandomTimetable extends MasterStateAction {
  public constructor() {
    super();
  }
  public TypeName(): string {
    return "go to random timetable";
  }
  protected GenerateNewState(state: IMasterState): IMasterState {
    const length = state.TimetableListState.FiltrateTimetables.length;
    if (length === 1) {
      return state;
    }
    const getRandom = () => random(0, length - 1);
    let x = getRandom();
    while (x === state.TimetableListState.CurrentIndex) {
      x = getRandom();
    }
    return {
      ...state,
      TimetableListState: {
        ...state.TimetableListState,
        ShowingAlternateSlotOf: null,
        CurrentIndex: x,
        CurrentSubIndex: 0,
      },
    };
  }
}