GameManager

Editor/MenuItems.cs

         const int kPlayMenuPriority = 160;
         const int kMenuPriority = 330;
 
+        #region PLAY HERE
+
         [MenuItem("Edit/Play from SceneView Position #%&P", priority = kPlayMenuPriority)]
         static void PlayHere()
         {
         {
             return PlayFromHere.IsReady;
         }
+
+        #endregion
 
         #region GROUP_UNGROUP
 
 
         #endregion
 
+        #region ASSETS
+
+        [UnityEditor.MenuItem("Assets/Create/Game Level")]
+        static void CreateGameLevel()
+        {
+            GameplayIngredients.Editor.AssetFactory.CreateAssetInProjectWindow<GameLevel>("", "New Game Level.asset");
+        }
+
+        #endregion
     }
 }

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Runtime/GameLevel.cs

+using System.Collections;
+using System.Collections.Generic;
+using UnityEngine;
+using GameplayIngredients.LevelStreaming;
+using NaughtyAttributes;
+using GameplayIngredients;
+
+public class GameLevel : ScriptableObject
+{
+    [ReorderableList, Scene]
+    public string[] StartupScenes;
+}

Runtime/GameLevel.cs.meta

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Runtime/LevelScripting/Actions/GameLevelLoadAction.cs

+using System.Linq;
+using System.Collections.Generic;
+using UnityEngine;
+using GameplayIngredients;
+using GameplayIngredients.Actions;
+using NaughtyAttributes;
+
+public class GameLevelLoadAction : ActionBase
+{
+    public enum Target
+    {
+        MainMenu,
+        First,
+        Previous,
+        Current,
+        Next,
+        Last,
+        SpecifiedLevel,
+        FromGameSave,
+    }
+    public bool ShowUI = true;
+    public Target level = Target.First;
+    [NonNullCheck, ShowIf("isSpecified"), Tooltip("Which Level to Load/Unload, when selected 'Specified' level")]
+    public GameLevel specifiedLevel;
+
+    [ShowIf("isGameSave")]
+    public int UserSaveIndex = 0;
+    [ShowIf("isGameSave")]
+    public string UserSaveName = "Progress";
+
+    [ReorderableList]
+    public Callable[] OnComplete;
+
+    private bool isSpecified() { return level == Target.SpecifiedLevel; }
+    private bool isGameSave() { return level == Target.FromGameSave; }
+
+    public override void Execute(GameObject instigator = null)
+    {
+        int index = -2;
+        var manager = Manager.Get<GameManager>();
+
+        switch (level)
+        {
+            case Target.MainMenu: index = -1; break;
+            case Target.First: index = 0; break;
+            case Target.Last: index = manager.MainGameLevels.Length - 1; break;
+            case Target.Current: index = manager.currentLevel; break;
+            case Target.Previous: index = Mathf.Max(0, manager.currentLevel-1); break;
+            case Target.Next: index = Mathf.Min(manager.MainGameLevels.Length - 1, manager.currentLevel + 1); break;
+            case Target.SpecifiedLevel:
+                if(specifiedLevel != null && manager.MainGameLevels.Contains(specifiedLevel))
+                {
+                    index = manager.MainGameLevels.ToList().IndexOf(specifiedLevel);
+                }
+                break;
+            case Target.FromGameSave: index = manager.currentSaveProgress; break;
+        }
+
+        manager.SwitchLevel(index, ShowUI, OnComplete);
+
+    }
+}

Runtime/LevelScripting/Actions/GameLevelLoadAction.cs.meta

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Runtime/Managers/Implementations/GameManager.cs

+using GameplayIngredients;
+using GameplayIngredients.Actions;
+using GameplayIngredients.LevelStreaming;
+using NaughtyAttributes;
+using System.Linq;
+using System.Collections.Generic;
+using UnityEngine;
+using GameplayIngredients.Logic;
+
+[ManagerDefaultPrefab("GameManager")]
+public class GameManager : Manager
+{
+    [Header("Events")]
+    [ReorderableList]
+    public Callable[] OnGameStart;
+    [ReorderableList]
+    public Callable[] OnLevelLoaded;
+    [ReorderableList]
+    public Callable[] OnMainMenuLoaded;
+
+    [Header("Levels"),NonNullCheck]
+    public GameLevel MainMenuGameLevel;
+    [ReorderableList,NonNullCheck]
+    public GameLevel[] MainGameLevels;
+
+    [Header("Save")]
+    public string ProgressSaveName = "Progress";
+
+    [Header("Messages")]
+    public string MainMenuStartMessage = "MAINMENU_START";
+    public string GameLevelStartMessage = "GAME_START";
+
+    public int currentLevel { get; private set; } = -2;
+
+    public int currentSaveProgress {
+        get { Manager.Get<GameSaveManager>().LoadUserSave(0); return Manager.Get<GameSaveManager>().GetInt(ProgressSaveName, GameSaveManager.Location.User);  }
+        set { Manager.Get<GameSaveManager>().SetInt(ProgressSaveName, GameSaveManager.Location.User, value); Manager.Get<GameSaveManager>().SaveUserSave(0); }
+    }
+
+    GameObject m_CurrentLevelSwitch;
+
+    public void Start()
+    {
+        currentLevel = int.MinValue;
+        Callable.Call(OnGameStart);
+        Manager.Get<GameSaveManager>().LoadUserSave(0);
+    }
+
+    Callable GetCurrentLevelSwitch(int targetLevel, bool showUI = false, Callable[] onComplete = null)
+    {
+        GameObject go = new GameObject();
+        go.name = $"LevelSwtich {currentLevel} -> {targetLevel}";
+        go.transform.parent = this.transform;
+        m_CurrentLevelSwitch = go;
+
+        var cameraFade = go.AddComponent<FullScreenFadeAction>();
+        var loadLevel = go.AddComponent<StreamingLevelAction>();
+        var sendMessage = go.AddComponent<SendMessageAction>();
+        var destroy = go.AddComponent<DestroyObjectAction>();
+        var next = go.AddComponent<Logic>();
+
+        cameraFade.Fading = FullScreenFadeManager.FadeMode.ToBlack;
+        cameraFade.Name = "Fade to Black";
+        cameraFade.Duration = 1.0f;
+        cameraFade.OnComplete = new Callable[]{ loadLevel };
+
+        loadLevel.Name = $"Load {(targetLevel < 0? "Main menu" : MainGameLevels[targetLevel].name)}";
+        loadLevel.ShowUI = showUI;
+        loadLevel.Action = LevelStreamingManager.StreamingAction.Replace;
+        var level = targetLevel < 0 ? MainMenuGameLevel : MainGameLevels[targetLevel];
+        loadLevel.SceneToActivate = level.StartupScenes[0];
+        loadLevel.Scenes = level.StartupScenes;
+        loadLevel.OnLoadComplete = new Callable[] { sendMessage, destroy, next };
+
+        string message = targetLevel == -1 ? MainMenuStartMessage : GameLevelStartMessage;
+        sendMessage.Name = $"Send {message}";
+        sendMessage.MessageToSend = message;
+
+        destroy.ObjectsToDestroy = new GameObject[] { go };
+
+        var nextActions = targetLevel < 0 ? OnMainMenuLoaded : OnLevelLoaded;
+        next.Calls =  nextActions.Concat(onComplete).ToArray();
+
+        // Return first callable
+        return cameraFade;
+    }
+
+    public void SwitchLevel(int nextLevel, bool showUI = false, Callable[] onComplete = null)
+    {
+        if (m_CurrentLevelSwitch == null)
+        {
+            var call = GetCurrentLevelSwitch(nextLevel, showUI, onComplete);
+            call.Execute();
+            currentLevel = nextLevel;
+        }
+        else
+            Debug.LogWarning("SwitchLevel : an Operation was still in progress and switching level could not be done. ");
+    }
+    
+}

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