SurvivalChance.cs

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using System;
using Loot.Api.Attributes;
using Loot.Api.Core;
using Loot.Api.Delegators;
using Loot.Modifiers.Base;
using Terraria;
using Terraria.DataStructures;

namespace Loot.Modifiers.EquipModifiers.Defensive
{
    public class SurvivalEffect : ModifierEffect
    {
        public float SurvivalChance; // Chance to survive lethal blow
        public static readonly float MAX_SURVIVAL_CHANCE = 0.5f;

        public override void ResetEffects()
        {
            SurvivalChance = 0f;
        }

        [AutoDelegation("OnPreKill")]
        [DelegationPrioritization(DelegationPrioritization.Late, 900)]
        private bool SurviveEvent(double damage, int hitDirection, bool pvp, ref bool playSound, ref bool genGore, ref PlayerDeathReason damageSource)
        {
            if (Main.rand.NextFloat() < Math.Min(SurvivalChance, MAX_SURVIVAL_CHANCE))
            {
                player.statLife = 1;
                return false;
            }

            return true;
        }
    }

    [UsesEffect(typeof(SurvivalEffect))]
    public class SurvivalChance : EquipModifier
    {
        // TODO easier tooltip templating
        public override ModifierTooltipLine.ModifierTooltipBuilder GetTooltip()
        {
            return base.GetTooltip()
                .WithPositive($"+{Properties.RoundedPower}% chance to survive lethal blows"
                              + $"{(Main.LocalPlayer.GetModPlayer<ModifierDelegatorPlayer>().GetEffect<SurvivalEffect>().SurvivalChance >= SurvivalEffect.MAX_SURVIVAL_CHANCE ? $" (cap reached: {SurvivalEffect.MAX_SURVIVAL_CHANCE * 100f}%)" : "")}"
                );
        }

        public override ModifierProperties.ModifierPropertiesBuilder GetModifierProperties(Item item)
        {
            return base.GetModifierProperties(item)
                .WithMaxMagnitude(5f)
                .WithRollChance(0.333f);
        }

        public override void UpdateEquip(Item item, Player player)
        {
            ModifierDelegatorPlayer.GetPlayer(player).GetEffect<SurvivalEffect>().SurvivalChance += Properties.RoundedPower / 100f;
        }
    }
}