evershade/Assets/Scripts/Managers/SaveManager.cs

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

namespace Managers
{
    [Serializable]
    public class SaveManager : MonoBehaviour
    {
        public static SaveManager Instance;
        public ItemDatabase itemDatabase;

        public GamePlayerSo defaultPlayerData;

        public string currentSaveID;

        public GameState GameState;
        public List<Save> Saves = new();

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

            Saves = GetSaves();
        }

        public void SaveGame()
        {
            GameState.Players[0].CurrentMap = MapManager.Instance.currentMapSo.name;
            // gameState.playerData.currentPosition = playerManager.transform.position;

            var save = new Save
            {
                GameState = GameState,
                ID = currentSaveID,
                Name = GameState.Players[0].PlayerName
            };

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

        public void LoadGame(Save save)
        {
            currentSaveID = save.ID;
            GameState = save.GameState;
            // 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()
        {
            // create new instance of player data
            var newPlayerData = new GamePlayer(defaultPlayerData);
            GameState.Players.Add(0, newPlayerData);
            // add items to inventory

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

            if (itemDatabase == null)
            {
                Debug.LogError("ItemDatabase is null");
                //TODO: remove? 
                LoadGame();
                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.Players[0].AddItemToInventory(item);
            }

            LoadGame();
        }

        public List<Save> GetSaves()
        {
            // if saves is not empty return it
            if (Saves.Count > 0) return Saves;

            var saves = new List<Save>();
            var path = Application.persistentDataPath + "/saves";
            if (Directory.Exists(path))
            {
                var files = Directory.GetFiles(path);
                foreach (var file in files)
                {
                    var save = JsonUtility.FromJson<Save>(File.ReadAllText(file));
                    saves.Add(save);
                }
            }

            return saves;
        }

        public Save GetSave(string id)
        {
            var saves = GetSaves();
            foreach (var save in saves)
                if (save.ID == id)
                    return save;
            return null;
        }
    }
}