SceneItemsManager.cs

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using System.Collections.Generic;
using UnityEngine;
 
 
[RequireComponent(typeof(GenerateGUID))]
public class SceneItemsManager : SingletonMonobehaviour<SceneItemsManager>, ISaveable
{
    private Transform m_ParentItem;
 
    [SerializeField] private GameObject m_ItemPrefab = null;
 
    private string iSaveableUniqueID;
 
    private GameObjectSave m_GameObjectSave;
 
    public string ISaveableUniqueID { get => iSaveableUniqueID; set => iSaveableUniqueID = value; }
    public GameObjectSave GameObjectSave { get => m_GameObjectSave; set => m_GameObjectSave = value; }
 
    private void AfterSceneLoad()
    {
        m_ParentItem = GameObject.FindGameObjectWithTag( Tags.ItemsParentTransform ).transform;
    }
 
    protected override void Awake()
    {
        base.Awake();
 
        ISaveableUniqueID = GetComponent<GenerateGUID>().GUID;
        GameObjectSave = new GameObjectSave();
    }
 
    private void DestroySceneItems()
    {
        // Get all items in the scene
        Item[] itemsInScene = GameObject.FindObjectsOfType<Item>();
 
        // Loop through all scene items and destroy them
        for( int i = itemsInScene.Length - 1; i > -1; i--)
        {
            Destroy( itemsInScene[i].gameObject );
        }
    }
 
    public void InstantiateSceneItem( int itemCode, Vector3 itemPosition )
    {
        GameObject itemGameObject = Instantiate( m_ItemPrefab, itemPosition, Quaternion.identity, m_ParentItem );
        Item item = itemGameObject.GetComponent<Item>();
        item.Init( itemCode );
    }
 
    private void InstantiateSceneItems( List<SceneItem> sceneItemList )
    {
        GameObject itemGameObject;
 
        foreach( SceneItem sceneItem in sceneItemList )
        {
            itemGameObject = Instantiate( m_ItemPrefab, new Vector3( sceneItem.m_Position.m_X, sceneItem.m_Position.m_Y, sceneItem.m_Position.m_Z ), Quaternion.identity, m_ParentItem );
 
            Item item = itemGameObject.GetComponent<Item>();
            item.ItemCode = sceneItem.m_ItemCode;
            item.name = sceneItem.m_ItemName;
        }
    }
 
    private void OnDisable()
    {
        ISaveableDeregister();
        EventHandler.AfterSceneLoadEvent -= AfterSceneLoad;
    }
 
    private void OnEnable()
    {
        ISaveableRegister();
        EventHandler.AfterSceneLoadEvent += AfterSceneLoad;
    }
 
    public void ISaveableDeregister()
    {
        SaveLoadManager.Instance.iSaveableObjectList.Remove( this );
    }
 
    public void ISaveableRegister()
    {
        SaveLoadManager.Instance.iSaveableObjectList.Add( this );
    }
 
    public void ISaveableRestoreScene( string sceneName )
    {
        if( GameObjectSave.m_SceneData.TryGetValue( sceneName, out SceneSave sceneSave ) )
        {
            if( sceneSave.m_ListSceneItem != null )
            {
                // Scene list item found - destroy existing items in scene
                DestroySceneItems();
 
                // Now instantiate the list of scene items
                InstantiateSceneItems( sceneSave.m_ListSceneItem );
            }
        }
    }
 
    public void ISaveableStoreScene( string sceneName )
    {
        // Remove old scene save for gameObject if exists
        GameObjectSave.m_SceneData.Remove( sceneName );
 
        // Get all items in the scene
        List<SceneItem> sceneItemList = new List<SceneItem>();
        Item[] itemsInScene = FindObjectsOfType<Item>();
 
        // Loop through all scene items
        foreach( Item item in itemsInScene )
        {
            SceneItem sceneItem = new SceneItem();
            sceneItem.m_ItemCode = item.ItemCode;
            sceneItem.m_Position = new Vector3Serializable( item.transform.position.x, item.transform.position.y, item.transform.position.z );
            sceneItem.m_ItemName = item.name;
 
            // Add scene item to list
            sceneItemList.Add( sceneItem );
        }
 
        // Create list scene items in scene save and set to scene item list.
        SceneSave sceneSave = new SceneSave();
        sceneSave.m_ListSceneItem = sceneItemList;
 
        // Add scene save to game object
        GameObjectSave.m_SceneData.Add( sceneName, sceneSave );
    }
 
}