/*
 * Copyright 2020 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { KogitoGuidedTour } from "../..";
import { DemoMode, Step, SubTutorialMode, Tutorial } from "../../api";

const concat = <T>(array1: T[], array2: T[]) => array1.concat(array2);
const flatMap = <T>(f: (array: T) => T[], array: T[]) => array.map(f).reduce(concat, []);

export const getCurrentStep = (currentStep: number, currentTutorial?: Tutorial): Step | undefined => {
  return getSteps(currentTutorial)[currentStep];
};

export const getSteps = (currentTutorial?: Tutorial) => {
  const guidedTour = KogitoGuidedTour.getInstance();
  const registeredTutorials = guidedTour.getRegisteredTutorials();
  const steps = currentTutorial?.steps ?? [];

  return flatMap((step) => {
    const stepMode = step.mode ?? new DemoMode();

    if (!("label" in stepMode)) {
      return [step];
    }

    const stepTutorialLabel = (stepMode as SubTutorialMode).label;
    const stepTutorial = registeredTutorials.find((tutorial) => {
      return tutorial.label === stepTutorialLabel;
    });

    return stepTutorial?.steps ?? [];
  }, steps);
};