beyond/Assets/Scripts/Tutorial/TutorialController.cs

using Sirenix.OdinInspector;
using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;

namespace Beyond
{
    public class TutorialController : MonoBehaviour
    {
        public bool played = false;
        public GameObject stepPanel;

        public List<BaseStepController> steps;
        public CanvasGroup tutorialButtonsCanva;
        private float fadeDuration = 0.4f, frameDuration = 0.02f;

        public List<GameObject> tutorialButtons;

        //colliders and stuff
        [SerializeField]
        private List<GameObject> objectsToEnableOnlyDuringTutorial;

        private BaseStepController currentStep;

        public int skipSteps = 0;
        public float delayToStart = 4f;
        // Start is called before the first frame update

        public UnityEvent OnTutorialEnded;

        private bool finished = false;

        private void Start()
        {
            if (tutorialButtons != null )
                tutorialButtons.ForEach(button => button.SetActive(false));
            if (tutorialButtonsCanva != null)
            {
                tutorialButtonsCanva.interactable = false;
                tutorialButtonsCanva.blocksRaycasts = false;
            }


        }

        [Button]
        public void StartTutorial()
        {
            StartCoroutine(StartTutorialCoroutine());
        }

        private IEnumerator StartTutorialCoroutine()
        {
            //could check based on something different
            yield return new WaitForEndOfFrame();
            if (played)
            {
                SkipTutorial();
                yield break;
            }
            played = true;
            if (objectsToEnableOnlyDuringTutorial.Count > 0)
            {
                objectsToEnableOnlyDuringTutorial.ForEach(obj => obj.SetActive(true));
            }

            yield return new WaitForSecondsRealtime(delayToStart);
            EnableTutorialButtons();
            // tutorialButtons.ForEach(button => button.SetActive(true));
            for (int i = 0; i < skipSteps; i++)
            {
                steps[i].ForceStepFinished();
            }
            for (int i = skipSteps; i < steps.Count; i++)
            {
                if (i != steps.Count - 1)
                {
                    steps[i].OnCompleted += steps[i + 1].StartStep; //this does not require an additional variable
                }
                else
                {
                    steps[i].OnCompleted += () =>
                    {
                        FinishTutorial();
                    };
                }
                int locali = i;
                steps[i].OnStarted += () => //this does
                {
                    Debug.Log("TutorialController.Step.OnStarted "+locali);
                    currentStep = steps[locali];
                };
            }

            steps[skipSteps].StartStep();
        }
        [Button]
        public void SkipTutorial()
        {
            if (!currentStep)
            {
                if (steps.Count > 0)
                {
                    currentStep = steps[0];
                }
                else
                    return;
            }
            
            int id = steps.FindIndex(step => step == currentStep);
            for (int i = id; i < steps.Count; i++)
            {
                steps[i].ForceStepFinished();
            }
            FinishTutorial();
        }

        public void EnableTutorialButtons()
        {
            StartCoroutine(FadeInTutorialButtons());
        }

        private IEnumerator FadeInTutorialButtons()
        {
            tutorialButtons.ForEach(button => button.SetActive(true));
            float currentDuration = 0;
            while (currentDuration < fadeDuration)
            {
                yield return new WaitForSecondsRealtime(Time.unscaledDeltaTime);
                tutorialButtonsCanva.alpha = currentDuration / fadeDuration;
                currentDuration += Time.unscaledDeltaTime;

                //  texts.ForEach(text => text.alpha = currentDuration / fadeDuration);
            }
            tutorialButtonsCanva.alpha = 1f;
            tutorialButtonsCanva.interactable = true;
            tutorialButtonsCanva.blocksRaycasts = true;
        }

        private void FinishTutorial()
        {
            if (finished)
            {
                return;
            }
            finished = true;
            played = true;
            StopAllCoroutines();
            DisableTutorialButtons();
            objectsToEnableOnlyDuringTutorial.ForEach(obj => obj.SetActive(false));
            OnTutorialEnded?.Invoke();
        }

        public void DisableTutorialButtons()
        {
            StartCoroutine(FadeOutTutorialButtons());
            // tutorialButtons.ForEach(button => button.SetActive(false));
        }

        private IEnumerator FadeOutTutorialButtons()
        {
            float currentDuration = 0;
            while (currentDuration < fadeDuration)
            {
                yield return new WaitForSecondsRealtime(Time.unscaledDeltaTime);
                tutorialButtonsCanva.alpha = (fadeDuration - currentDuration) / fadeDuration;
                currentDuration += Time.unscaledDeltaTime;
                //    texts.ForEach(text => text.alpha = (fadeDuration - currentDuration) / fadeDuration);
            }

            tutorialButtonsCanva.alpha = 0f;
            tutorialButtonsCanva.interactable = false;
            tutorialButtonsCanva.blocksRaycasts = false;
            tutorialButtons.ForEach(button => button.SetActive(false));
        }
        [Button]
        public void SkipTutorialStep()
        {
            try {
                Debug.Log("skipped");
                currentStep.ForceStepFinished();
            }
            catch (Exception e)
            {
                Debug.LogError("Exception in TutorialController.SkupTutorialStep, gameObject: "+gameObject.name+" "+e.ToString());
            }
        }

        public int GetCurrentStepIndex()
        {
            return steps.FindIndex(item => item == currentStep);
        }

        public void SkipTutorialStepsTo(int stepIndex)
        {
            int index = GetCurrentStepIndex();
            while (index != stepIndex)
            {
                steps[index].ForceStepFinished();
                index++;
            }
        }
    }
}