feat: add save system class

Assets/_Scripts/Systems/SaveSystem.meta

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Assets/_Scripts/Systems/SaveSystem/PlayerData.cs

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+[System.Serializable]
+public class PlayerData
+{
+    public string Username { get; set; }
+    public string Password { get; set; }
+
+    public int HighScore { get; set; }
+}

Assets/_Scripts/Systems/SaveSystem/PlayerData.cs.meta

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Assets/_Scripts/Systems/SaveSystem/SaveSystem.cs

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+using System.IO;
+using System.Runtime.Serialization.Formatters.Binary;
+using System.Threading.Tasks;
+using UnityEngine;
+using Newtonsoft.Json;
+
+public static class SaveSystem
+{
+    private static readonly string Path = $"{Application.persistentDataPath}/saves";
+    
+    public static void SaveToBinary<T>(string fileName, T data)
+    {
+        if (!Directory.Exists(Path))
+        {
+            Directory.CreateDirectory(Path);
+        }
+
+        using var stream = new FileStream($"{Path}/{fileName}", FileMode.Create);
+        byte[] buffer = ObjectToByteArray(data);
+        stream.Write(buffer, 0, buffer.Length);
+    }
+    
+    public static T LoadFromBinary<T>(string fileName)
+    {
+        if (!Directory.Exists($"{Path}") || !File.Exists($"{Path}/{fileName}"))
+        {
+            return default;
+        }
+        
+        using var stream = new FileStream($"{Path}/{fileName}", FileMode.Open);
+        var buffer = new byte[stream.Length];
+        stream.Read(buffer, 0, buffer.Length);
+        return ByteArrayToObject<T>(buffer);
+    }
+    
+    public static async Task SaveToBinaryAsync<T>(string fileName, T data)
+    {
+        if (!Directory.Exists(Path))
+        {
+            Directory.CreateDirectory(Path);
+        }
+
+        using var stream = new FileStream($"{Path}/{fileName}", FileMode.Create);
+        byte[] buffer = ObjectToByteArray(data);
+        await stream.WriteAsync(buffer, 0, buffer.Length);
+    }
+    
+    public static async Task<T> LoadFromBinaryAsync<T>(string fileName)
+    {
+        if (!Directory.Exists($"{Path}") || !File.Exists($"{Path}/{fileName}"))
+        {
+            return default;
+        }
+        
+        using var stream = new FileStream($"{Path}/{fileName}", FileMode.Open);
+        var buffer = new byte[stream.Length];
+        await stream.ReadAsync(buffer, 0, buffer.Length);
+        return ByteArrayToObject<T>(buffer);
+    }
+
+    public static void SaveToJson<T>(string fileName, T data)
+    {
+        if (!Directory.Exists(Path))
+        {
+            Directory.CreateDirectory(Path);
+        }
+
+        using var outputFile = new StreamWriter($"{Path}/{fileName}");
+        var json = JsonConvert.SerializeObject(data);
+        outputFile.Write(json);
+    }
+    
+    public static async Task SaveToJsonAsync<T>(string fileName, T data)
+    {
+        if (!Directory.Exists(Path))
+        {
+            Directory.CreateDirectory(Path);
+        }
+
+        using var outputFile = new StreamWriter($"{Path}/{fileName}");
+        var json = JsonConvert.SerializeObject(data);
+        await outputFile.WriteAsync(json);
+    }
+
+    public static T LoadFromJson<T>(string fileName)
+    {
+        if (!Directory.Exists($"{Path}") || !File.Exists($"{Path}/{fileName}"))
+        {
+            return default;
+        }
+
+        using var inputFile = new StreamReader($"{Path}/{fileName}");
+        var json = inputFile.ReadToEnd();
+        return JsonConvert.DeserializeObject<T>(json);
+    }
+    
+    public static async Task<T> LoadFromJsonAsync<T>(string fileName)
+    {
+        if (!Directory.Exists($"{Path}") || !File.Exists($"{Path}/{fileName}"))
+        {
+            return default;
+        }
+
+        using var inputFile = new StreamReader($"{Path}/{fileName}");
+        var json = await inputFile.ReadToEndAsync();
+        return JsonConvert.DeserializeObject<T>(json);
+    }
+    
+    private static byte[] ObjectToByteArray(System.Object obj)
+    {
+        var binaryFormatter = new BinaryFormatter();
+        using var stream = new MemoryStream();
+        binaryFormatter.Serialize(stream, obj);
+        return stream.ToArray();
+    }
+
+    private static T ByteArrayToObject<T>(byte[] arr)
+    {
+        var binaryFormatter = new BinaryFormatter();
+        using var stream = new MemoryStream();
+        stream.Write(arr, 0, arr.Length);
+        stream.Position = 0;
+        return (T) binaryFormatter.Deserialize(stream);
+    }
+}

Assets/_Scripts/Systems/SaveSystem/SaveSystem.cs.meta

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