evershade/Assets/Scripts/Managers/SaveManager.cs

using System;
using System.IO;
using Data.ScriptableObjects;
using Types;
using UnityEngine;
using Random = UnityEngine.Random;

namespace Managers
{
    [Serializable]
    public class GameState
    {
        public GamePlayer PlayerData;
    }

    public class SaveManager : MonoBehaviour
    {
        public static SaveManager Instance;
        public GameState gameState;
        public ItemDatabase itemDatabase;
        public GamePlayer DefaultPlayerData;

        private void Awake()
        {
            if (Instance == null)
            {
                Instance = this;
                DontDestroyOnLoad(gameObject);
                gameState = new GameState();
            }
            else
            {
                Destroy(gameObject);
            }
        }

        public void SaveGame(PlayerManager playerManager)
        {
            gameState.PlayerData.CurrentMap = MapManager.Instance.currentMapSo.name;
            // gameState.playerData.currentPosition = playerManager.transform.position;

            var json = JsonUtility.ToJson(gameState);
            File.WriteAllText(Application.persistentDataPath + "/gameState.json", json);
        }

        public void LoadGame(GameState gs)
        {
            gameState = gs;
            // playerManager.Initialize(gameState.playerData);
            // todo: enable map 
            // MapManager.Instance.GetMap(gameState.playerData.currentMap);

            /*var path = Application.persistentDataPath + "/gameState.json";
                if (File.Exists(path))
                {
                    var json = File.ReadAllText(path);
                    gameState = JsonUtility.FromJson<GameState>(json);
        }*/
        }

        public void LoadGame()
        {
            var path = Application.persistentDataPath + "/gameState.json";
            if (File.Exists(path))
            {
                var json = File.ReadAllText(path);
                gameState = JsonUtility.FromJson<GameState>(json);
            }
        }

        public void NewGame()
        {
            gameState.PlayerData = DefaultPlayerData;
            // add items to inventory

            if (itemDatabase == null)
                itemDatabase = Resources.Load<ItemDatabase>("GameItems");

            if (itemDatabase == null)
            {
                Debug.LogError("ItemDatabase is null");
                //TODO: remove? 
                LoadGame(gameState);
                return;
            }

            if (itemDatabase.AllItems.Count == 0)
                itemDatabase.LoadAllItems();

            Debug.Log("Item count: " + itemDatabase.AllItems.Count);

            for (var i = 0; i < 10; i++)
            {
                // set slot to random item
                var item = itemDatabase.AllItems[
                    Random.Range(0, itemDatabase.AllItems.Count - 1)];
                gameState.PlayerData.AddItemToInventory(item);
            }

            LoadGame(gameState);
        }
    }
}