ForgottenWawiTech/Content/Projectiles/TridentOfTheSunken/TridentOfTheSunkenHoldout.cs

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

namespace ForgottenWawiTech.Content.Projectiles.TridentOfTheSunken
{
    public class TridentOfTheSunkenHoldout : ModProjectile
    {
        private const int MaxChargeTime = 60;
        private const int RequiredChargeTime = 60;
        // Slight offsets so the player grips the center of the sprite instead of the trident hovering ahead.
        private const float HoldoutForwardOffset = 12f;
        private const float HoldoutVerticalOffset = -6f;

        private ref float Charge => ref Projectile.ai[0];
        private ref float HasFired => ref Projectile.ai[1];

        public override string Texture => "ForgottenWawiTech/Content/Items/Weapons/Magic/TridentOfTheSunken";

        public override void SetDefaults()
        {
            Projectile.width = 30;
            Projectile.height = 256;
            Projectile.friendly = false;
            Projectile.hostile = false;
            Projectile.penetrate = -1;
            Projectile.tileCollide = false;
            Projectile.ignoreWater = true;
        }

        public override void AI()
        {
            Player player = Main.player[Projectile.owner];
            int tridentType = ModContent.ItemType<Items.Weapons.Magic.TridentOfTheSunken>();
            if (player.dead || player.HeldItem.type != tridentType)
            {
                Projectile.Kill();
                return;
            }

            Vector2 handPosition = player.RotatedRelativePoint(player.MountedCenter, true);
            player.heldProj = Projectile.whoAmI;
            player.itemAnimation = player.itemTime = 2;

            Vector2 aim = Projectile.velocity;
            if (Main.myPlayer == player.whoAmI)
            {
                aim = Main.MouseWorld - handPosition;
                if (aim.LengthSquared() < 0.01f)
                {
                    aim = new Vector2(player.direction, 0f);
                }
                aim.Normalize();

                player.ChangeDir(aim.X >= 0f ? 1 : -1);
                Projectile.velocity = aim;
            }

            Vector2 anchorOffset = new Vector2(player.direction * HoldoutForwardOffset, HoldoutVerticalOffset * player.gravDir);
            Projectile.Center = handPosition + anchorOffset;

            Projectile.direction = player.direction;
            Projectile.spriteDirection = player.direction;
            Projectile.rotation = 0f;

            if (player.channel)
            {
                Charge = MathHelper.Clamp(Charge + 1f, 0f, MaxChargeTime);
                if (Charge == RequiredChargeTime)
                {
                    ReadyFeedback(player);
                }
                else if (Charge % 15f == 0f)
                {
                    SoundEngine.PlaySound(SoundID.Item15 with { Volume = 0.3f }, player.Center);
                }
            }
            else if (HasFired == 0f)
            {
                if (Main.myPlayer == player.whoAmI && Charge >= RequiredChargeTime)
                {
                    FireProjectile(player, handPosition);
                }
                else
                {
                    CancelCharge(player);
                }
            }

            Projectile.timeLeft = 2;
        }

        public override void Kill(int timeLeft)
        {
            if (HasFired == 0f && Main.player[Projectile.owner] is Player player && player.active && !player.dead)
            {
                Vector2 handPosition = player.RotatedRelativePoint(player.MountedCenter, true);
                if (Main.myPlayer == player.whoAmI && Charge >= RequiredChargeTime)
                {
                    FireProjectile(player, handPosition);
                }
                else if (Charge < RequiredChargeTime)
                {
                    CancelCharge(player, false);
                }
            }
        }

        private void FireProjectile(Player player, Vector2 spawnPosition)
        {
            if (Charge < RequiredChargeTime)
            {
                CancelCharge(player);
                return;
            }

            Vector2 aim = Projectile.velocity;
            if (aim.LengthSquared() < 0.01f)
            {
                aim = new Vector2(player.direction, 0f);
            }
            aim.Normalize();

            float chargeProgress = MathHelper.Clamp(Charge / MaxChargeTime, 0f, 1f);
            float speed = MathHelper.Lerp(7f, 12f, chargeProgress);

            int baseDamage = player.GetWeaponDamage(player.HeldItem);
            int damage = (int)(baseDamage * MathHelper.Lerp(1f, 1.6f, chargeProgress));
            float knockBack = player.GetWeaponKnockback(player.HeldItem, player.HeldItem.knockBack) * MathHelper.Lerp(1f, 1.2f, chargeProgress);

            IEntitySource source = player.GetSource_ItemUse(player.HeldItem);
            int proj = Projectile.NewProjectile(source, spawnPosition, aim * speed, ModContent.ProjectileType<TridentOfTheSunkenShot>(), damage, knockBack, player.whoAmI, chargeProgress);

            if (Main.projectile.IndexInRange(proj))
            {
                Main.projectile[proj].localAI[0] = chargeProgress;
            }

            SoundEngine.PlaySound(SoundID.Item72 with { Volume = 0.8f }, spawnPosition);
            HasFired = 1f;
            Projectile.netUpdate = true;
            Projectile.Kill();
        }

        private void ReadyFeedback(Player player)
        {
            if (Main.dedServ)
            {
                return;
            }

            SoundEngine.PlaySound(SoundID.Item33 with { Volume = 0.6f, Pitch = -0.1f }, Projectile.Center);

            for (int i = 0; i < 8; i++)
            {
                Vector2 velocity = Main.rand.NextVector2Circular(1.2f, 1.2f) * Main.rand.NextFloat(0.8f, 1.4f);
                Dust dust = Dust.NewDustDirect(Projectile.Center - new Vector2(5f, 85f), 16, 16, DustID.BlueFairy, velocity.X, velocity.Y, 100, default, 1.1f);
                dust.noGravity = true;
            }
        }

        private void CancelCharge(Player player, bool killProjectile = true)
        {
            if (HasFired != 0f)
            {
                return;
            }

            HasFired = -1f;
            Projectile.netUpdate = true;
            SoundEngine.PlaySound(SoundID.MenuClose with { Volume = 0.6f }, player.Center);
            if (killProjectile && Projectile.active)
            {
                Projectile.Kill();
            }
        }
    }
}