open-project-1/UOP1_Project/Assets/Scripts/SaveSystem/SaveSystem.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AddressableAssets;
using UnityEngine.ResourceManagement.AsyncOperations;

public class SaveSystem : ScriptableObject
{
	[SerializeField] private LoadEventChannelSO _loadLocation = default;
	[SerializeField] private InventorySO _playerInventory=default;
	[SerializeField]
	private QuestManagerSO _questManagerSO = default; 
    public string saveFilename = "save.chop";
	public string backupSaveFilename = "save.chop.bak";
	public Save saveData = new Save();

	void OnEnable()
	{
		_loadLocation.OnLoadingRequested += CacheLoadLocations;
	}

	void OnDisable()
	{
		_loadLocation.OnLoadingRequested -= CacheLoadLocations;
	}

	private void CacheLoadLocations(GameSceneSO locationToLoad, bool showLoadingScreen, bool fadeScreen)
	{
		LocationSO locationSO = locationToLoad as LocationSO;
		if (locationSO)
		{
			saveData._locationId = locationSO.Guid;
		}

		SaveDataToDisk();
	}

	public bool LoadSaveDataFromDisk()
	{
		if (FileManager.LoadFromFile(saveFilename, out var json))
		{
			saveData.LoadFromJson(json);
			return true;
		}

		return false;
	}

	public IEnumerator LoadSavedInventory()
	{
		_playerInventory.Items.Clear(); 
		foreach (var serializedItemStack in saveData._itemStacks)
		{
			var loadItemOperationHandle = Addressables.LoadAssetAsync<ItemSO>(serializedItemStack.itemGuid);
			yield return loadItemOperationHandle;
			if (loadItemOperationHandle.Status == AsyncOperationStatus.Succeeded)
			{
				var itemSO = loadItemOperationHandle.Result;
				_playerInventory.Add(itemSO, serializedItemStack.amount);
			}
		}
	}
	public void LoadSavedQuestlineStatus()
	{
		_questManagerSO.SetFinishedQuestlineItemsFromSave(saveData._finishedQuestlineItemsGUIds); 
		
	}

	public void SaveDataToDisk()
	{
		saveData._itemStacks.Clear();
		foreach (var itemStack in _playerInventory.Items)
		{
				saveData._itemStacks.Add(new SerializedItemStack(itemStack.Item.Guid, itemStack.Amount));
		}
		saveData._finishedQuestlineItemsGUIds.Clear();

		foreach (var item in _questManagerSO.GetFinishedQuestlineItemsGUIds())
		{
			saveData._finishedQuestlineItemsGUIds.Add(item); 

		}
		if (FileManager.MoveFile(saveFilename, backupSaveFilename))
		{
			if (FileManager.WriteToFile(saveFilename, saveData.ToJson()))
			{
				Debug.Log("Save successful");
			}
		}
	}

	public void WriteEmptySaveFile()
	{
		FileManager.WriteToFile(saveFilename, "");
	
	}
	public void SetNewGameData()
	{
		FileManager.WriteToFile(saveFilename, "");
		_playerInventory.Init(); 
		_questManagerSO.ResetQuestlines();
		SaveDataToDisk(); 

	}
}