ProjectileLoader.cs

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using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Linq.Expressions;
using System.Reflection;
using Terraria.ID;
using Terraria.Localization;

namespace Terraria.ModLoader
{
    //todo: further documentation
    public static class ProjectileLoader
    {
        private static int nextProjectile = ProjectileID.Count;
        internal static readonly IList<ModProjectile> projectiles = new List<ModProjectile>();
        internal static readonly IList<GlobalProjectile> globalProjectiles = new List<GlobalProjectile>();
        internal static GlobalProjectile[] InstancedGlobals = new GlobalProjectile[0];
        internal static readonly IDictionary<string, int> globalIndexes = new Dictionary<string, int>();
        internal static readonly IDictionary<Type, int> globalIndexesByType = new Dictionary<Type, int>();

        private class HookList
        {
            public GlobalProjectile[] arr = new GlobalProjectile[0];
            public readonly MethodInfo method;

            public HookList(MethodInfo method) {
                this.method = method;
            }
        }

        private static List<HookList> hooks = new List<HookList>();

        private static HookList AddHook<F>(Expression<Func<GlobalProjectile, F>> func) {
            var hook = new HookList(ModLoader.Method(func));
            hooks.Add(hook);
            return hook;
        }

        internal static int ReserveProjectileID() {
            if (ModNet.AllowVanillaClients) throw new Exception("Adding projectiles breaks vanilla client compatibility");

            int reserveID = nextProjectile;
            nextProjectile++;
            return reserveID;
        }

        public static int ProjectileCount => nextProjectile;

        public static ModProjectile GetProjectile(int type) {
            return type >= ProjectileID.Count && type < ProjectileCount ? projectiles[type - ProjectileID.Count] : null;
        }
        //change initial size of Terraria.Player.ownedProjectileCounts to ProjectileLoader.ProjectileCount()
        internal static void ResizeArrays() {
            Array.Resize(ref Main.projectileLoaded, nextProjectile);
            Array.Resize(ref Main.projectileTexture, nextProjectile);
            Array.Resize(ref Main.projHostile, nextProjectile);
            Array.Resize(ref Main.projHook, nextProjectile);
            Array.Resize(ref Main.projFrames, nextProjectile);
            Array.Resize(ref Main.projPet, nextProjectile);
            Array.Resize(ref Lang._projectileNameCache, nextProjectile);
            Array.Resize(ref ProjectileID.Sets.YoyosLifeTimeMultiplier, nextProjectile);
            Array.Resize(ref ProjectileID.Sets.YoyosMaximumRange, nextProjectile);
            Array.Resize(ref ProjectileID.Sets.YoyosTopSpeed, nextProjectile);
            Array.Resize(ref ProjectileID.Sets.CanDistortWater, nextProjectile);
            Array.Resize(ref ProjectileID.Sets.MinionShot, nextProjectile);
            Array.Resize(ref ProjectileID.Sets.SentryShot, nextProjectile);
            Array.Resize(ref ProjectileID.Sets.ForcePlateDetection, nextProjectile);
            Array.Resize(ref ProjectileID.Sets.TrailingMode, nextProjectile);
            Array.Resize(ref ProjectileID.Sets.TrailCacheLength, nextProjectile);
            Array.Resize(ref ProjectileID.Sets.LightPet, nextProjectile);
            Array.Resize(ref ProjectileID.Sets.Homing, nextProjectile);
            Array.Resize(ref ProjectileID.Sets.IsADD2Turret, nextProjectile);
            Array.Resize(ref ProjectileID.Sets.TurretFeature, nextProjectile);
            Array.Resize(ref ProjectileID.Sets.MinionTargettingFeature, nextProjectile);
            Array.Resize(ref ProjectileID.Sets.MinionSacrificable, nextProjectile);
            Array.Resize(ref ProjectileID.Sets.DontAttachHideToAlpha, nextProjectile);
            Array.Resize(ref ProjectileID.Sets.NeedsUUID, nextProjectile);
            Array.Resize(ref ProjectileID.Sets.StardustDragon, nextProjectile);
            Array.Resize(ref ProjectileID.Sets.NoLiquidDistortion, nextProjectile);
            for (int k = ProjectileID.Count; k < nextProjectile; k++) {
                Lang._projectileNameCache[k] = LocalizedText.Empty;
                ProjectileID.Sets.YoyosLifeTimeMultiplier[k] = -1;
                ProjectileID.Sets.YoyosMaximumRange[k] = 200f;
                ProjectileID.Sets.YoyosTopSpeed[k] = 10f;
                ProjectileID.Sets.CanDistortWater[k] = true;
                Main.projectileLoaded[k] = true;
                Main.projFrames[k] = 1;
                ProjectileID.Sets.TrailingMode[k] = -1;
                ProjectileID.Sets.TrailCacheLength[k] = 10;
            }
            Array.Resize(ref Projectile.perIDStaticNPCImmunity, nextProjectile);
            for (int i = 0; i < nextProjectile; i++) {
                Projectile.perIDStaticNPCImmunity[i] = new uint[200];
            }

            InstancedGlobals = globalProjectiles.Where(g => g.InstancePerEntity).ToArray();
            for (int i = 0; i < InstancedGlobals.Length; i++) {
                InstancedGlobals[i].instanceIndex = i;
            }
            foreach (var hook in hooks) {
                hook.arr = ModLoader.BuildGlobalHook(globalProjectiles, hook.method);
            }
        }

        internal static void Unload() {
            projectiles.Clear();
            nextProjectile = ProjectileID.Count;
            globalProjectiles.Clear();
            globalIndexes.Clear();
            globalIndexesByType.Clear();
        }

        internal static bool IsModProjectile(Projectile projectile) {
            return projectile.type >= ProjectileID.Count;
        }

        private static HookList HookSetDefaults = AddHook<Action<Projectile>>(g => g.SetDefaults);

        internal static void SetDefaults(Projectile projectile, bool createModProjectile = true) {
            if (IsModProjectile(projectile) && createModProjectile) {
                projectile.modProjectile = GetProjectile(projectile.type).NewInstance(projectile);
            }
            projectile.globalProjectiles = InstancedGlobals.Select(g => g.NewInstance(projectile)).ToArray();
            projectile.modProjectile?.SetDefaults();
            foreach (GlobalProjectile g in HookSetDefaults.arr) {
                g.Instance(projectile).SetDefaults(projectile);
            }
        }

        internal static GlobalProjectile GetGlobalProjectile(Projectile projectile, Mod mod, string name) {
            int index;
            return globalIndexes.TryGetValue(mod.Name + ':' + name, out index) ? globalProjectiles[index].Instance(projectile) : null;
        }

        internal static GlobalProjectile GetGlobalProjectile(Projectile projectile, Type type) {
            int index;
            return globalIndexesByType.TryGetValue(type, out index) ? (index > -1 ? globalProjectiles[index].Instance(projectile) : null) : null;
        }
        //in Terraria.Projectile rename AI to VanillaAI then make AI call ProjectileLoader.ProjectileAI(this)
        public static void ProjectileAI(Projectile projectile) {
            if (PreAI(projectile)) {
                int type = projectile.type;
                bool useAiType = projectile.modProjectile != null && projectile.modProjectile.aiType > 0;
                if (useAiType) {
                    projectile.type = projectile.modProjectile.aiType;
                }
                projectile.VanillaAI();
                if (useAiType) {
                    projectile.type = type;
                }
                AI(projectile);
            }
            PostAI(projectile);
        }

        private static HookList HookPreAI = AddHook<Func<Projectile, bool>>(g => g.PreAI);

        public static bool PreAI(Projectile projectile) {
            bool result = true;
            foreach (GlobalProjectile g in HookPreAI.arr) {
                result &= g.Instance(projectile).PreAI(projectile);
            }
            if (result && projectile.modProjectile != null) {
                return projectile.modProjectile.PreAI();
            }
            return result;
        }

        private static HookList HookAI = AddHook<Action<Projectile>>(g => g.AI);

        public static void AI(Projectile projectile) {
            projectile.modProjectile?.AI();

            foreach (GlobalProjectile g in HookAI.arr) {
                g.Instance(projectile).AI(projectile);
            }
        }

        private static HookList HookPostAI = AddHook<Action<Projectile>>(g => g.PostAI);

        public static void PostAI(Projectile projectile) {
            projectile.modProjectile?.PostAI();

            foreach (GlobalProjectile g in HookPostAI.arr) {
                g.Instance(projectile).PostAI(projectile);
            }
        }
        //in Terraria.NetMessage.SendData at end of case 27 call
        //  ProjectileLoader.SendExtraAI(projectile, writer, ref bb14);
        public static byte[] SendExtraAI(Projectile projectile, ref BitsByte flags) {
            if (projectile.modProjectile != null) {
                byte[] data;
                using (MemoryStream stream = new MemoryStream()) {
                    using (BinaryWriter modWriter = new BinaryWriter(stream)) {
                        projectile.modProjectile.SendExtraAI(modWriter);
                        modWriter.Flush();
                        data = stream.ToArray();
                    }
                }
                if (data.Length > 0) {
                    flags[Projectile.maxAI + 1] = true;
                }
                return data;
            }
            return new byte[0];
        }
        //in Terraria.MessageBuffer.GetData for case 27 after reading all data add
        //  byte[] extraAI = ProjectileLoader.ReadExtraAI(reader, bitsByte14);
        public static byte[] ReadExtraAI(BinaryReader reader, BitsByte flags) {
            if (flags[Projectile.maxAI + 1]) {
                return reader.ReadBytes(reader.ReadByte());
            }
            return new byte[0];
        }
        //in Terraria.MessageBuffer.GetData for case 27 before calling ProjectileFixDesperation add
        //  ProjectileLoader.ReceiveExtraAI(projectile, extraAI);
        public static void ReceiveExtraAI(Projectile projectile, byte[] extraAI) {
            if (extraAI.Length > 0 && projectile.modProjectile != null) {
                using (MemoryStream stream = new MemoryStream(extraAI)) {
                    using (BinaryReader reader = new BinaryReader(stream)) {
                        projectile.modProjectile.ReceiveExtraAI(reader);
                    }
                }
            }
        }

        private static HookList HookShouldUpdatePosition = AddHook<Func<Projectile, bool>>(g => g.ShouldUpdatePosition);

        public static bool ShouldUpdatePosition(Projectile projectile) {
            if (IsModProjectile(projectile) && !projectile.modProjectile.ShouldUpdatePosition()) {
                return false;
            }
            foreach (GlobalProjectile g in HookShouldUpdatePosition.arr) {
                if (!g.Instance(projectile).ShouldUpdatePosition(projectile)) {
                    return false;
                }
            }
            return true;
        }

        private delegate bool DelegateTileCollideStyle(Projectile projectile, ref int width, ref int height, ref bool fallThrough);
        private static HookList HookTileCollideStyle = AddHook<DelegateTileCollideStyle>(g => g.TileCollideStyle);

        public static bool TileCollideStyle(Projectile projectile, ref int width, ref int height, ref bool fallThrough) {
            if (IsModProjectile(projectile) && !projectile.modProjectile.TileCollideStyle(ref width, ref height, ref fallThrough)) {
                return false;
            }

            foreach (GlobalProjectile g in HookTileCollideStyle.arr) {
                if (!g.Instance(projectile).TileCollideStyle(projectile, ref width, ref height, ref fallThrough)) {
                    return false;
                }
            }
            return true;
        }

        private static HookList HookOnTileCollide = AddHook<Func<Projectile, Vector2, bool>>(g => g.OnTileCollide);

        public static bool OnTileCollide(Projectile projectile, Vector2 oldVelocity) {
            bool result = true;
            foreach (GlobalProjectile g in HookOnTileCollide.arr) {
                result &= g.Instance(projectile).OnTileCollide(projectile, oldVelocity);
            }
            if (result && projectile.modProjectile != null) {
                return projectile.modProjectile.OnTileCollide(oldVelocity);
            }
            return result;
        }

        private static HookList HookCanCutTiles = AddHook<Func<Projectile, bool?>>(g => g.CanCutTiles);

        public static bool? CanCutTiles(Projectile projectile) {
            foreach (GlobalProjectile g in HookCanCutTiles.arr) {
                bool? canCutTiles = g.Instance(projectile).CanCutTiles(projectile);
                if (canCutTiles.HasValue) {
                    return canCutTiles.Value;
                }
            }
            return projectile.modProjectile?.CanCutTiles();
        }

        private static HookList HookCutTiles = AddHook<Action<Projectile>>(g => g.CutTiles);

        public static void CutTiles(Projectile projectile) {
            foreach (GlobalProjectile g in HookCutTiles.arr) {
                g.Instance(projectile).CutTiles(projectile);
            }
            projectile.modProjectile?.CutTiles();
        }

        private static HookList HookPreKill = AddHook<Func<Projectile, int, bool>>(g => g.PreKill);

        public static bool PreKill(Projectile projectile, int timeLeft) {
            bool result = true;
            foreach (GlobalProjectile g in HookPreKill.arr) {
                result &= g.Instance(projectile).PreKill(projectile, timeLeft);
            }
            if (result && projectile.modProjectile != null) {
                return projectile.modProjectile.PreKill(timeLeft);
            }
            return result;
        }

        private static HookList HookKill = AddHook<Action<Projectile, int>>(g => g.Kill);

        public static void Kill(Projectile projectile, int timeLeft) {
            projectile.modProjectile?.Kill(timeLeft);

            foreach (GlobalProjectile g in HookKill.arr) {
                g.Instance(projectile).Kill(projectile, timeLeft);
            }
        }

        private static HookList HookCanDamage = AddHook<Func<Projectile, bool>>(g => g.CanDamage);

        public static bool CanDamage(Projectile projectile) {
            if (projectile.modProjectile != null && !projectile.modProjectile.CanDamage()) {
                return false;
            }
            foreach (GlobalProjectile g in HookCanDamage.arr) {
                if (!g.Instance(projectile).CanDamage(projectile)) {
                    return false;
                }
            }
            return true;
        }

        private static HookList HookMinionContactDamage = AddHook<Func<Projectile, bool>>(g => g.MinionContactDamage);

        public static bool MinionContactDamage(Projectile projectile) {
            if (projectile.modProjectile != null && projectile.modProjectile.MinionContactDamage()) {
                return true;
            }
            foreach (GlobalProjectile g in HookMinionContactDamage.arr) {
                if (g.Instance(projectile).MinionContactDamage(projectile)) {
                    return true;
                }
            }
            return false;
        }

        private delegate void DelegateModifyDamageHitbox(Projectile projectile, ref Rectangle hitbox);
        private static HookList HookModifyDamageHitbox = AddHook<DelegateModifyDamageHitbox>(g => g.ModifyDamageHitbox);

        public static void ModifyDamageHitbox(Projectile projectile, ref Rectangle hitbox) {
            projectile.modProjectile?.ModifyDamageHitbox(ref hitbox);
            foreach (GlobalProjectile g in HookModifyDamageHitbox.arr) {
                g.Instance(projectile).ModifyDamageHitbox(projectile, ref hitbox);
            }
        }

        private static HookList HookCanHitNPC = AddHook<Func<Projectile, NPC, bool?>>(g => g.CanHitNPC);

        public static bool? CanHitNPC(Projectile projectile, NPC target) {
            bool? flag = null;
            foreach (GlobalProjectile g in HookCanHitNPC.arr) {
                bool? canHit = g.Instance(projectile).CanHitNPC(projectile, target);
                if (canHit.HasValue && !canHit.Value) {
                    return false;
                }
                if (canHit.HasValue) {
                    flag = canHit.Value;
                }
            }
            if (projectile.modProjectile != null) {
                bool? canHit = projectile.modProjectile.CanHitNPC(target);
                if (canHit.HasValue && !canHit.Value) {
                    return false;
                }
                if (canHit.HasValue) {
                    flag = canHit.Value;
                }
            }
            return flag;
        }

        private delegate void DelegateModifyHitNPC(Projectile projectile, NPC target, ref int damage, ref float knockback, ref bool crit, ref int hitDirection);
        private static HookList HookModifyHitNPC = AddHook<DelegateModifyHitNPC>(g => g.ModifyHitNPC);

        public static void ModifyHitNPC(Projectile projectile, NPC target, ref int damage, ref float knockback, ref bool crit, ref int hitDirection) {
            projectile.modProjectile?.ModifyHitNPC(target, ref damage, ref knockback, ref crit, ref hitDirection);

            foreach (GlobalProjectile g in HookModifyHitNPC.arr) {
                g.Instance(projectile).ModifyHitNPC(projectile, target, ref damage, ref knockback, ref crit, ref hitDirection);
            }
        }

        private static HookList HookOnHitNPC = AddHook<Action<Projectile, NPC, int, float, bool>>(g => g.OnHitNPC);

        public static void OnHitNPC(Projectile projectile, NPC target, int damage, float knockback, bool crit) {
            projectile.modProjectile?.OnHitNPC(target, damage, knockback, crit);

            foreach (GlobalProjectile g in HookOnHitNPC.arr) {
                g.Instance(projectile).OnHitNPC(projectile, target, damage, knockback, crit);
            }
        }

        private static HookList HookCanHitPvp = AddHook<Func<Projectile, Player, bool>>(g => g.CanHitPvp);

        public static bool CanHitPvp(Projectile projectile, Player target) {
            foreach (GlobalProjectile g in HookCanHitPvp.arr) {
                if (!g.Instance(projectile).CanHitPvp(projectile, target)) {
                    return false;
                }
            }
            if (projectile.modProjectile != null) {
                return projectile.modProjectile.CanHitPvp(target);
            }
            return true;
        }

        private delegate void DelegateModifyHitPvp(Projectile projectile, Player target, ref int damage, ref bool crit);
        private static HookList HookModifyHitPvp = AddHook<DelegateModifyHitPvp>(g => g.ModifyHitPvp);

        public static void ModifyHitPvp(Projectile projectile, Player target, ref int damage, ref bool crit) {
            projectile.modProjectile?.ModifyHitPvp(target, ref damage, ref crit);

            foreach (GlobalProjectile g in HookModifyHitPvp.arr) {
                g.Instance(projectile).ModifyHitPvp(projectile, target, ref damage, ref crit);
            }
        }

        private static HookList HookOnHitPvp = AddHook<Action<Projectile, Player, int, bool>>(g => g.OnHitPvp);

        public static void OnHitPvp(Projectile projectile, Player target, int damage, bool crit) {
            projectile.modProjectile?.OnHitPvp(target, damage, crit);

            foreach (GlobalProjectile g in HookOnHitPvp.arr) {
                g.Instance(projectile).OnHitPvp(projectile, target, damage, crit);
            }
        }

        private static HookList HookCanHitPlayer = AddHook<Func<Projectile, Player, bool>>(g => g.CanHitPlayer);

        public static bool CanHitPlayer(Projectile projectile, Player target) {
            foreach (GlobalProjectile g in HookCanHitPlayer.arr) {
                if (!g.Instance(projectile).CanHitPlayer(projectile, target)) {
                    return false;
                }
            }
            if (projectile.modProjectile != null) {
                return projectile.modProjectile.CanHitPlayer(target);
            }
            return true;
        }

        private delegate void DelegateModifyHitPlayer(Projectile projectile, Player target, ref int damage, ref bool crit);
        private static HookList HookModifyHitPlayer = AddHook<DelegateModifyHitPlayer>(g => g.ModifyHitPlayer);

        public static void ModifyHitPlayer(Projectile projectile, Player target, ref int damage, ref bool crit) {
            projectile.modProjectile?.ModifyHitPlayer(target, ref damage, ref crit);

            foreach (GlobalProjectile g in HookModifyHitPlayer.arr) {
                g.Instance(projectile).ModifyHitPlayer(projectile, target, ref damage, ref crit);
            }
        }

        private static HookList HookOnHitPlayer = AddHook<Action<Projectile, Player, int, bool>>(g => g.OnHitPlayer);

        public static void OnHitPlayer(Projectile projectile, Player target, int damage, bool crit) {
            projectile.modProjectile?.OnHitPlayer(target, damage, crit);

            foreach (GlobalProjectile g in HookOnHitPlayer.arr) {
                g.Instance(projectile).OnHitPlayer(projectile, target, damage, crit);
            }
        }

        private static HookList HookColliding = AddHook<Func<Projectile, Rectangle, Rectangle, bool?>>(g => g.Colliding);

        public static bool? Colliding(Projectile projectile, Rectangle projHitbox, Rectangle targetHitbox) {
            foreach (GlobalProjectile g in HookColliding.arr) {
                bool? colliding = g.Instance(projectile).Colliding(projectile, projHitbox, targetHitbox);
                if (colliding.HasValue) {
                    return colliding.Value;
                }
            }
            return projectile.modProjectile?.Colliding(projHitbox, targetHitbox);
        }

        public static void DrawHeldProjInFrontOfHeldItemAndArms(Projectile projectile, ref bool flag) {
            if (projectile.modProjectile != null) {
                flag = projectile.modProjectile.drawHeldProjInFrontOfHeldItemAndArms;
            }
        }

        private static HookList HookGetAlpha = AddHook<Func<Projectile, Color, Color?>>(g => g.GetAlpha);

        public static Color? GetAlpha(Projectile projectile, Color lightColor) {
            foreach (GlobalProjectile g in HookGetAlpha.arr) {
                Color? color = g.Instance(projectile).GetAlpha(projectile, lightColor);
                if (color.HasValue) {
                    return color;
                }
            }
            return projectile.modProjectile?.GetAlpha(lightColor);
        }

        public static void DrawOffset(Projectile projectile, ref int offsetX, ref int offsetY, ref float originX) {
            if (projectile.modProjectile != null) {
                offsetX = projectile.modProjectile.drawOffsetX;
                offsetY = -projectile.modProjectile.drawOriginOffsetY;
                originX += projectile.modProjectile.drawOriginOffsetX;
            }
        }

        private static HookList HookPreDrawExtras = AddHook<Func<Projectile, SpriteBatch, bool>>(g => g.PreDrawExtras);

        public static bool PreDrawExtras(Projectile projectile, SpriteBatch spriteBatch) {
            bool result = true;
            foreach (GlobalProjectile g in HookPreDrawExtras.arr) {
                result &= g.Instance(projectile).PreDrawExtras(projectile, spriteBatch);
            }
            if (result && projectile.modProjectile != null) {
                return projectile.modProjectile.PreDrawExtras(spriteBatch);
            }
            return result;
        }

        private static HookList HookPreDraw = AddHook<Func<Projectile, SpriteBatch, Color, bool>>(g => g.PreDraw);

        public static bool PreDraw(Projectile projectile, SpriteBatch spriteBatch, Color lightColor) {
            bool result = true;
            foreach (GlobalProjectile g in HookPreDraw.arr) {
                result &= g.Instance(projectile).PreDraw(projectile, spriteBatch, lightColor);
            }
            if (result && projectile.modProjectile != null) {
                return projectile.modProjectile.PreDraw(spriteBatch, lightColor);
            }
            return result;
        }

        private static HookList HookPostDraw = AddHook<Action<Projectile, SpriteBatch, Color>>(g => g.PostDraw);

        public static void PostDraw(Projectile projectile, SpriteBatch spriteBatch, Color lightColor) {
            projectile.modProjectile?.PostDraw(spriteBatch, lightColor);

            foreach (GlobalProjectile g in HookPostDraw.arr) {
                g.Instance(projectile).PostDraw(projectile, spriteBatch, lightColor);
            }
        }

        private static HookList HookCanUseGrapple = AddHook<Func<int, Player, bool?>>(g => g.CanUseGrapple);

        public static bool? CanUseGrapple(int type, Player player) {
            var flag = GetProjectile(type)?.CanUseGrapple(player);

            foreach (GlobalProjectile g in HookCanUseGrapple.arr) {
                bool? canGrapple = g.CanUseGrapple(type, player);
                if (canGrapple.HasValue) {
                    flag = canGrapple;
                }
            }
            return flag;
        }

        private static HookList HookSingleGrappleHook = AddHook<Func<int, Player, bool?>>(g => g.SingleGrappleHook);

        public static bool? SingleGrappleHook(int type, Player player) {
            bool? flag = GetProjectile(type)?.SingleGrappleHook(player);

            foreach (GlobalProjectile g in HookSingleGrappleHook.arr) {
                bool? singleHook = g.SingleGrappleHook(type, player);
                if (singleHook.HasValue) {
                    flag = singleHook;
                }
            }
            return flag;
        }

        private delegate void DelegateUseGrapple(Player player, ref int type);
        private static HookList HookUseGrapple = AddHook<DelegateUseGrapple>(g => g.UseGrapple);

        public static void UseGrapple(Player player, ref int type) {
            GetProjectile(type)?.UseGrapple(player, ref type);

            foreach (GlobalProjectile g in HookUseGrapple.arr) {
                g.UseGrapple(player, ref type);
            }
        }

        public static bool GrappleOutOfRange(float distance, Projectile projectile) {
            return distance > projectile.modProjectile?.GrappleRange();
        }

        private delegate void DelegateNumGrappleHooks(Projectile projectile, Player player, ref int numHooks);
        private static HookList HookNumGrappleHooks = AddHook<DelegateNumGrappleHooks>(g => g.NumGrappleHooks);

        public static void NumGrappleHooks(Projectile projectile, Player player, ref int numHooks) {
            projectile.modProjectile?.NumGrappleHooks(player, ref numHooks);

            foreach (GlobalProjectile g in HookNumGrappleHooks.arr) {
                g.Instance(projectile).NumGrappleHooks(projectile, player, ref numHooks);
            }
        }

        private delegate void DelegateGrappleRetreatSpeed(Projectile projectile, Player player, ref float speed);
        private static HookList HookGrappleRetreatSpeed = AddHook<DelegateGrappleRetreatSpeed>(g => g.GrappleRetreatSpeed);

        public static void GrappleRetreatSpeed(Projectile projectile, Player player, ref float speed) {
            projectile.modProjectile?.GrappleRetreatSpeed(player, ref speed);

            foreach (GlobalProjectile g in HookGrappleRetreatSpeed.arr) {
                g.Instance(projectile).GrappleRetreatSpeed(projectile, player, ref speed);
            }
        }

        private delegate void DelegateGrapplePullSpeed(Projectile projectile, Player player, ref float speed);
        private static HookList HookGrapplePullSpeed = AddHook<DelegateGrapplePullSpeed>(g => g.GrapplePullSpeed);

        public static void GrapplePullSpeed(Projectile projectile, Player player, ref float speed) {
            projectile.modProjectile?.GrapplePullSpeed(player, ref speed);

            foreach (GlobalProjectile g in HookGrapplePullSpeed.arr) {
                g.Instance(projectile).GrapplePullSpeed(projectile, player, ref speed);
            }
        }

        private delegate void DelegateGrappleTargetPoint(Projectile projectile, Player player, ref float grappleX, ref float grappleY);
        private static HookList HookGrappleTargetPoint = AddHook<DelegateGrappleTargetPoint>(g => g.GrappleTargetPoint);

        public static void GrappleTargetPoint(Projectile projectile, Player player, ref float grappleX, ref float grappleY) {
            projectile.modProjectile?.GrappleTargetPoint(player, ref grappleX, ref grappleY);

            foreach(GlobalProjectile g in HookGrappleTargetPoint.arr) {
                g.Instance(projectile).GrappleTargetPoint(projectile, player, ref grappleX, ref grappleY);
            }
        }

        private static HookList HookDrawBehind = AddHook<Action<Projectile, int, List<int>, List<int>, List<int>, List<int>>>(g => g.DrawBehind);

        internal static void DrawBehind(Projectile projectile, int index, List<int> drawCacheProjsBehindNPCsAndTiles, List<int> drawCacheProjsBehindNPCs, List<int> drawCacheProjsBehindProjectiles, List<int> drawCacheProjsOverWiresUI) {
            projectile.modProjectile?.DrawBehind(index, drawCacheProjsBehindNPCsAndTiles, drawCacheProjsBehindNPCs, drawCacheProjsBehindProjectiles, drawCacheProjsOverWiresUI);

            foreach (GlobalProjectile g in HookDrawBehind.arr) {
                g.Instance(projectile).DrawBehind(projectile, index, drawCacheProjsBehindNPCsAndTiles, drawCacheProjsBehindNPCs, drawCacheProjsBehindProjectiles, drawCacheProjsOverWiresUI);
            }
        }

        private static bool HasMethod(Type t, string method, params Type[] args) {
            return t.GetMethod(method, args).DeclaringType != typeof(GlobalProjectile);
        }

        internal static void VerifyGlobalProjectile(GlobalProjectile projectile) {
            var type = projectile.GetType();

            bool hasInstanceFields = type.GetFields(BindingFlags.Instance | BindingFlags.Public | BindingFlags.NonPublic)
                .Any(f => f.DeclaringType != typeof(GlobalProjectile));
            if (hasInstanceFields) {
                if (!projectile.InstancePerEntity) {
                    throw new Exception(type + " has instance fields but does not set InstancePerEntity to true. Either use static fields, or per instance globals");
                }
            }
        }
    }
}