function reducer()

in packages/eui/src/components/tour/useEuiTour.tsx [23:79]
57 lines of code
11 McCabe index (conditional complexity)

  function reducer(state: EuiTourState, action: EuiTourAction): EuiTourState {
    switch (action.type) {
      case 'EUI_TOUR_FINISH': {
        const currentTourStep = action.payload.resetTour
          ? 1
          : state.currentTourStep;
        return {
          ...state,
          currentTourStep,
          isTourActive: false,
        };
      }
      case 'EUI_TOUR_RESET':
        return {
          ...state,
          currentTourStep: 1,
          isTourActive: true,
        };
      case 'EUI_TOUR_NEXT': {
        const nextStep =
          state.currentTourStep === stepsArray.length
            ? state.currentTourStep
            : state.currentTourStep + 1;
        return {
          ...state,
          currentTourStep: nextStep,
        };
      }
      case 'EUI_TOUR_PREVIOUS': {
        const prevStep =
          state.currentTourStep === 1
            ? state.currentTourStep
            : state.currentTourStep - 1;
        return {
          ...state,
          currentTourStep: prevStep,
        };
      }
      case 'EUI_TOUR_GOTO': {
        const step = action.payload.step;
        const isTourActive =
          typeof action.payload.isTourActive !== 'undefined'
            ? action.payload.isTourActive
            : state.isTourActive;
        const goTo =
          step <= stepsArray.length && step > 0 ? step : state.currentTourStep;
        return {
          ...state,
          currentTourStep: goTo,
          isTourActive,
        };
      }
      default:
        assertNever(action);
        return state;
    }
  }