new-horizons/NewHorizons/Handlers/InvulnerabilityHandler.cs

using HarmonyLib;
using NewHorizons.Utility.OWML;
using UnityEngine;
using UnityEngine.SceneManagement;

namespace NewHorizons.Handlers
{
    [HarmonyPatch]
    internal class InvulnerabilityHandler
    {
        private static bool _invulnerableOverride;

        public static void MakeInvulnerable(bool invulnerable)
        {
            NHLogger.Log($"Toggling immortality: {invulnerable}");

            // We're setting our own override because we want to ensure that no other mod that can set _invincible can break this for us
            _invulnerableOverride = invulnerable;
            var deathManager = GetDeathManager();
            var resources = GetPlayerResouces();

            if (invulnerable)
            {
                deathManager._invincible = true;
            }
            else
            {
                resources._currentHealth = 100f;
                deathManager._invincible = false;
            }
        }

        [HarmonyPrefix]
        [HarmonyPatch(typeof(DeathManager), nameof(DeathManager.KillPlayer))]
        [HarmonyPatch(typeof(PlayerResources), nameof(PlayerResources.ApplyInstantDamage))]
        [HarmonyPatch(typeof(PlayerImpactAudio), nameof(PlayerImpactAudio.OnImpact))]
        public static bool DeathManager_KillPlayer_Prefix()
        {
            // Base game _invincible is still overriden by high speed impacts
            // We also are avoiding playing impact related effects by just skipping these methods
            return !_invulnerableOverride;
        }

        private static DeathManager GetDeathManager() => GameObject.FindObjectOfType<DeathManager>();
        private static PlayerResources GetPlayerResouces() => GameObject.FindObjectOfType<PlayerResources>();

        static InvulnerabilityHandler()
        {
            // If the scene unloads when _invulnerableOverride is on it might not get turned off
            SceneManager.sceneUnloaded += (_) => _invulnerableOverride = false;
        }
    }
}