Magic skill stuff

using static StardewMountain.Mod;

public class SaveData
{
       public class Magic_
       {
           public int magicLevel = 0;
           public int magicExp = 0;
       }
       public Magic_ Magic = new Magic();
}

public class Mod
{
    public static SaveData Data = new SaveData();
}

public static class Extensions
{

        public static int getMagicLevel(this SFarmer player)
        {
            if (player != Game1.player || Data == null)
                return 0;

            return Data.magic.magicLevel;
        }

        public static int getMagicExp(this SFarmer player)
        {
            if (player != Game1.player || Data == null)
                return 0;

            return Data.magic.magicExp;
        }

        public static void addMagicExp(this SFarmer player, int exp)
        {
            if (player != Game1.player || Data == null)
                return;

            if (Data.magic.magicLevel >= 50)
                return;

            Data.magic.magicExp += exp;

            while (Data.magic.magicExp >= player.getMagicExpForNextLevel() )
            {
                Data.magic.magicExp -= player.getMagicExpForNextLevel();
                Data.magic.magicLevel++;
                if ( Data.magic.magicLevel % 2 == 1 )
                    Data.magic.freePoints++;
                player.setMaxMana(player.getMagicLevel() == 1 ? 50 : player.getMaxMana() + 10);
                Magic.newMagicLevels.Add(Data.magic.magicLevel);
            }
        }

        public static int getMagicExpForNextLevel(this SFarmer player)
        {
            if (player != Game1.player || Data == null)
                return 50;

            return 50 + Data.magic.magicLevel * 50;
        }
}