Tutorial.cs

using System;
using DG.Tweening;
using TMPro;
using Unity.VisualScripting;
using UnityEngine;
using UnityEngine.InputSystem;
using UnityEngine.UI;

public class Tutorial: MonoBehaviour {
    public event Action OnTutorialCompleted;
    public static Tutorial I {
        get {
            if (_instance == null) {
                _instance = FindFirstObjectByType<Tutorial>();
            }
            return _instance;
        }
    }
    private static Tutorial _instance;
    const string tutorialSaveString = "tutorial_completed";
    public bool TutorialCompleted => PlayerPrefs.GetInt(tutorialSaveString, 0) == 1;

    [SerializeField] bool resetProgress = false;
    [SerializeField] TextMeshProUGUI tutorialText;
    [SerializeField] Image inputImage;
    [SerializeField] Sprite arrowKeys;
    [SerializeField] Sprite leftStick;
    [SerializeField] Sprite westBtn;
    [SerializeField] Sprite southBtn;
    [SerializeField] Sprite spaceBar;
    [SerializeField] Sprite leftShift;
    CanvasGroup canvasGroup;


    void Awake() {
        #if !UNITY_EDITOR
        resetProgress = false;
        #endif
        
        canvasGroup = tutorialText.GetComponentInParent<CanvasGroup>();
        if (canvasGroup == null) {
            canvasGroup = tutorialText.gameObject.transform.parent.AddComponent<CanvasGroup>();
        }
        canvasGroup.interactable = false;
        canvasGroup.blocksRaycasts = false;
        canvasGroup.alpha = 0f;

        inputImage.preserveAspect = true;

        if (resetProgress) {
            PlayerPrefs.SetInt(tutorialSaveString, 0);
        }
        if (TutorialCompleted) return;
        DoTutorial();
    }

    async void DoTutorial() {
        // Learn Movement
        await Awaitable.WaitForSecondsAsync(1.5f);
        tutorialText.text = $"{GetText("Press the <i>arrows keys</i>", "Use the <i>left stick</i>")} to move...";
        inputImage.sprite = GetSprite(arrowKeys, leftStick);
        await AwaitFade(true);
        var playerMovement = InputSystem.actions.FindAction("Move", throwIfNotFound:true);
        while (playerMovement.ReadValue<Vector2>() == Vector2.zero) {
            await Awaitable.NextFrameAsync();
        }
        await Awaitable.WaitForSecondsAsync(1f);
        await AwaitFade(false, 1f);

        // Learn Attack
        tutorialText.text = $"Press {GetText("<i>SpaceBar</i>", "<i>West Button</i>")} to attack...";
        inputImage.sprite = GetSprite(spaceBar, westBtn);
        await AwaitFade(true);
        bool attacked = false;
        void OnAttack() => attacked = true;
        Player.I.OnAttack += OnAttack;
        while (!attacked) {
            await Awaitable.NextFrameAsync();
        }
        Player.I.OnAttack -= OnAttack;
        await Awaitable.WaitForSecondsAsync(1f);
        await AwaitFade(false, 1f);

        // Learn Dodge
        tutorialText.text = $"Press {GetText("<i>Shift</i>", "<i>South Button</i>")} to dodge...";
        inputImage.sprite = GetSprite(leftShift, southBtn);
        await AwaitFade(true);
        bool dodged = false;
        void OnDodge() => dodged = true;
        Player.I.OnDodge += OnDodge;
        while (!dodged) {
            await Awaitable.NextFrameAsync();
        }
        Player.I.OnDodge -= OnDodge;
        await Awaitable.WaitForSecondsAsync(1f);
        await AwaitFade(false, 1f);

        // Final Step!
        tutorialText.text = "<b>Good Luck!</b>";
        tutorialText.fontSize = 128;
        Destroy(inputImage);
        await AwaitFade(true, 2f);
        await AwaitFade(false);

        //Set tutorial as completed
        PlayerPrefs.SetInt(tutorialSaveString, 1);
        OnTutorialCompleted?.Invoke();
    }

    async Awaitable AwaitFade(bool fadeIn, float additionalWait = 0f) {
        const float fadeTime = 1f;
        canvasGroup.DOFade(fadeIn ? 1f : 0f, fadeTime).SetEase(Ease.InOutSine);
        await Awaitable.WaitForSecondsAsync(fadeTime + additionalWait);
    }

    string GetText(string mouseKeyboardText, string controllerText) => ControllerConnected ? controllerText : mouseKeyboardText;
    Sprite GetSprite(Sprite mouseKeyboardSprite, Sprite controllerSprite) => ControllerConnected ? controllerSprite : mouseKeyboardSprite;
    bool ControllerConnected => Gamepad.all.Count > 0;
}