WeaponDebuffModifier.cs

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using System;
using System.Collections.Generic;
using Loot.Api.Attributes;
using Loot.Api.Core;
using Loot.Api.Delegators;
using Terraria;
using Terraria.ID;
using Terraria.Localization;
using Terraria.ModLoader;
using static Loot.Api.Core.ModifierProperties;
using static Loot.Api.Core.ModifierTooltipLine;

namespace Loot.Modifiers.Base
{
    public class WeaponDebuffEffect : ModifierEffect
    {
        public List<(int type, int time, float chance)> DebuffChances = new List<(int type, int time, float chance)>();

        public override void OnInitialize()
        {
            DebuffChances = new List<(int type, int time, float chance)>();
        }

        public override void ResetEffects()
        {
            DebuffChances.Clear();
        }
    }

    [UsesEffect(typeof(WeaponDebuffEffect))] // The attribute is inherited, which is nice
    public abstract class WeaponDebuffModifier : WeaponModifier
    {
        public override ModifierTooltipBuilder GetTooltip()
        {
            return base.GetTooltip()
                .WithPositive($"+{Properties.RoundedPower}% chance to inflict {GetBuffName()} for {RoundedBuffTime()}s");
        }

        public override ModifierPropertiesBuilder GetModifierProperties(Item item)
        {
            return base.GetModifierProperties(item)
                .WithMinMagnitude(5f)
                .WithMinMagnitude(10f)
                .WithRoundPrecision(1);
        }

        private float RoundedBuffTime()
        {
            return (float) Math.Round((double) BuffTime / 60f, Properties.RoundPrecision);
        }

        public abstract int BuffType { get; }
        public abstract int BuffTime { get; }
        public abstract float BuffInflictionChance { get; }

        private string GetBuffName()
        {
            if (BuffType >= BuffID.Count)
            {
                return BuffLoader.GetBuff(BuffType)?.DisplayName.GetTranslation(LanguageManager.Instance.ActiveCulture) ?? "null";
            }

            return Lang.GetBuffName(BuffType);
        }

        public override void OnHitNPC(Item item, Player player, NPC target, int damage, float knockBack, bool crit)
        {
            if (Main.rand.NextFloat() < Properties.RoundedPower / 100f * BuffInflictionChance)
            {
                target.AddBuff(BuffType, BuffTime);
            }
        }

        public override void OnHitPvp(Item item, Player player, Player target, int damage, bool crit)
        {
            if (Main.rand.NextFloat() < Properties.RoundedPower / 100f * BuffInflictionChance)
            {
                target.AddBuff(BuffType, BuffTime);
            }
        }

        // Required for minion/proj snapshotting
        public override void HoldItem(Item item, Player player)
        {
            ModifierDelegatorPlayer.GetPlayer(player).GetEffect<WeaponDebuffEffect>()
                .DebuffChances
                .Add((BuffType, BuffTime, Properties.RoundedPower / 100f * BuffInflictionChance));
        }
    }
}