ForgottenWawiTech/Content/Items/Weapons/Magic/BookOfUnholy.cs

using Microsoft.Xna.Framework;
using Terraria;
using Terraria.Audio;
using Terraria.DataStructures;
using Terraria.ID;
using Terraria.ModLoader;

namespace ForgottenWawiTech.Content.Items.Weapons.Magic
{
    public class BookOfUnholy: ModItem
    {
        public override void SetDefaults()
        {
            Item.damage = 10000;
            Item.mana = 0; // Temp value for development
            Item.crit = 100;
            Item.DamageType = DamageClass.Magic;
            Item.width = 40;
            Item.height = 40;
            Item.useTime = 10;
            Item.useAnimation = 10;
            Item.useStyle = ItemUseStyleID.Shoot;
            Item.knockBack = 6;
            Item.value = Item.buyPrice(platinum: 20);
            Item.rare = ItemRarityID.Red;
            Item.autoReuse = true;
            Item.noMelee = true;
            Item.shoot = ProjectileID.PurificationPowder;
            Item.shootSpeed = 50f;
            Item.useAmmo = AmmoID.None;
        }

        // On shoot, fire Projectile ID 502 (the rainbow projectile) instead of the default ammo projectile
        public override bool Shoot(Player player, Terraria.DataStructures.EntitySource_ItemUse_WithAmmo source, Vector2 position, Vector2 velocity, int type, int damage, float knockBack)
        {
            // Shoot every projectile from vanilla Terraria magic weapons at once.
            int[] projectiles = new int[] {
                ProjectileID.WoodenArrowFriendly,
                ProjectileID.EnchantedBoomerang,
                ProjectileID.MagicMissile,
                ProjectileID.Flamelash,
                ProjectileID.DemonScythe,
                ProjectileID.RainbowRodBullet,
                ProjectileID.UnholyTridentFriendly,
                ProjectileID.LightBeam,
                ProjectileID.NightBeam,
                ProjectileID.RainFriendly,
                ProjectileID.IceSickle,
                ProjectileID.LastPrismLaser,
                ProjectileID.NebulaBlaze2
            };
            foreach (int projectileType in projectiles)
            {
                Terraria.Projectile.NewProjectile(source, position, velocity, projectileType, damage, knockBack, player.whoAmI);
            }
            return false; // return false to prevent tModLoader from shooting the default projectile
        }

        public override Vector2? HoldoutOffset() {
			return new Vector2(2f, -2f);
		}

        public override void ModifyShootStats(Player player, ref Vector2 position, ref Vector2 velocity, ref int type, ref int damage, ref float knockback) {
			Vector2 muzzleOffset = Vector2.Normalize(velocity) * 25f;

			if (Collision.CanHit(position, 0, 0, position + muzzleOffset, 0, 0)) {
				position += muzzleOffset;
			}
		}

        public override void AddRecipes()
        {
            Recipe recipe = CreateRecipe();
            recipe.AddIngredient(ItemID.BouncyBoulder, 100);
            recipe.AddIngredient(ItemID.LunarBar, 20);
            recipe.AddTile(TileID.LunarCraftingStation);
            recipe.Register();
        }
    }
}