DamageWithManaCost.cs

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using System;
using System.Linq;
using Loot.Api.Core;
using Loot.Modifiers.Base;
using Terraria;

namespace Loot.Modifiers.WeaponModifiers
{
    public class DamageWithManaCost : WeaponModifier
    {
        public override ModifierTooltipLine.ModifierTooltipBuilder GetTooltip()
        {
            return base.GetTooltip()
                .WithPositive($"+{Properties.RoundedPower}% damage, but adds +{_manaCost} mana cost");
        }

        public override ModifierProperties.ModifierPropertiesBuilder GetModifierProperties(Item item)
        {
            return base.GetModifierProperties(item)
                .WithMinMagnitude(5f)
                .WithMaxMagnitude(15f);
        }

        public override bool CanRoll(ModifierContext ctx)
        {
            return base.CanRoll(ctx)
                   && ctx.Method != ModifierContextMethod.SetupStartInventory
                   && ctx.Item.mana == 0;
        }

        public override void ModifyWeaponDamage(Item item, Player player, ref float add, ref float mult, ref float flat)
        {
            base.ModifyWeaponDamage(item, player, ref add, ref mult, ref flat);
            add += Properties.RoundedPower / 100f;
        }

        public override bool CanUseItem(Item item, Player player)
        {
            return base.CanUseItem(item, player)
                   && player.statMana >= item.mana
                   && (item.useAmmo == 0 || player.inventory.Any(x => x.ammo == item.useAmmo));
        }

        private int _manaCost;

        public override void Apply(Item item)
        {
            base.Apply(item);
            _manaCost = Math.Max((int) (item.useTime * (float) item.useTime / GetMaxUseTime(item) / 10f), 1);
            item.mana += _manaCost;
        }

        private int GetMaxUseTime(Item item)
        {
            int number = 15;

            if (item.useTime <= 8)
            {
                return number;
            }

            while (number <= 55)
            {
                if (item.useTime <= number)
                {
                    return number;
                }

                number += 5;
            }

            return 56;
        }
    }
}