Fruitomation/Assets/Scripts/Game/UpgradeManager.cs

using System.Collections.Generic;
using UnityEngine;
using System.IO;
using System.Linq;
using System;

namespace Fruitomation.Game
{
    [Serializable] public enum BasicUpgrade
    {
        Grapes,
        Bananas,
        Kiwi,
        Mangoes,
        Durian,
        BuddhasHand,
        Pitayas,
        
        AppleSlices,
        DriedAppleSlices,
        AppleJuice,
        GrapeJuice,
        Wine,
        Raisins,
        DriedFruitSelection,
        BananaSlices,
        DriedBananaSlices,
        BananaBacon,
        BananaPeeler,
        KiwiPresser,
        KiwiSeedOil,
        KiwiVinegar,
        AppleMangoJuice,
        SlicedKiwi,
        BananaIceCream,
        MangoJuice,
        MangoSlices,
        SpicedBananaIceCream,
        DurianPowder,
        DurianSlices,
        ExoticFruitSelection,
        BuddhasHandSlices,
        PitayaPeeler,
        PitayaFoodDye,
        PitayaIceCream,
        SpicedPitayaIceCream,
    }
    
    public class UnlockedUpgrades
    {
        [Serializable] public class Serialized
        {
            [SerializeField] private BasicUpgrade[] BasicUpgrades;

            private Serialized()
            {
                // All logic done in Serialize
            }
            
            public UnlockedUpgrades Unserialize()
            {
                UnlockedUpgrades upgrades = new();
                foreach (BasicUpgrade upgrade in BasicUpgrades)
                {
                    Debug.Log($"Restored [{upgrade}] upgrade");
                    upgrades.Unlocks.Add(upgrade);
                }

                return upgrades;
            }

            public static Serialized Serialize(UnlockedUpgrades upgrades)
            {
                Serialized serialized = new()
                {
                    BasicUpgrades = upgrades.Unlocks.ToArray()
                };

                return serialized;
            }
        }

        private HashSet<BasicUpgrade> Unlocks = new();

        public void Unlock(BasicUpgrade upgrade)
        {
            Unlocks.Add(upgrade);
        }
    }

    public static class UpgradeManager
    {
        private static string Filepath => Path.Combine(Application.persistentDataPath, "upgrades.json");
        private static UnlockedUpgrades CurrentUpgrades;

        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)]
        private static void LoadSavedUpgrades()
        {
            if (File.Exists(Filepath))
            {
                string json = File.ReadAllText(Filepath);
                UnlockedUpgrades.Serialized serialized = JsonUtility.FromJson<UnlockedUpgrades.Serialized>(json);

                if (serialized is not null)
                {
                    CurrentUpgrades = JsonUtility.FromJson<UnlockedUpgrades.Serialized>(json).Unserialize();
                }
            }

            CurrentUpgrades ??= new UnlockedUpgrades();

            Application.quitting += SaveUpgradesToDisk;
        }

        private static void SaveUpgradesToDisk()
        {
            UnlockedUpgrades.Serialized serialized = UnlockedUpgrades.Serialized.Serialize(CurrentUpgrades);
            string json = JsonUtility.ToJson(serialized, true);
            File.WriteAllText(Filepath, json);
        }

        public static void Unlock(BasicUpgrade upgrade) => CurrentUpgrades.Unlock(upgrade);
    }
}