ForgottenWawiTech/Content/Projectiles/Avali/AvaliThermalDrone.cs

using Microsoft.Xna.Framework;
using Terraria;
using Terraria.ID;
using Terraria.ModLoader;
using ForgottenWawiTech.Content.Buffs.Debuffs;
using ForgottenWawiTech.Content.Players;

namespace ForgottenWawiTech.Content.Projectiles.Avali
{
    public class AvaliThermalDrone : ModProjectile
    {
        private const float OrbitSpeed = 0.06f;
        private const float OrbitRadius = 72f;
        private const int MarkCooldown = 45;
        private const float MarkRange = 700f;

        public override string Texture => "ForgottenWawiTech/Assets/PlaceholderProj";

        public override void SetStaticDefaults()
        {
            ProjectileID.Sets.MinionSacrificable[Type] = false;
            ProjectileID.Sets.MinionShot[Type] = true;
        }

        public override void SetDefaults()
        {
            Projectile.width = 26;
            Projectile.height = 26;
            Projectile.friendly = true;
            Projectile.DamageType = DamageClass.Summon;
            Projectile.penetrate = -1;
            Projectile.tileCollide = false;
            Projectile.ignoreWater = true;
            Projectile.timeLeft = 2;
            Projectile.netImportant = true;
            Projectile.minion = true;
            Projectile.minionSlots = 0f;
        }

        public override void AI()
        {
            Player owner = Main.player[Projectile.owner];
            AvaliSkirmisherPlayer modPlayer = owner.GetModPlayer<AvaliSkirmisherPlayer>();
            if (!owner.active || owner.dead || !modPlayer.ThermalDronesActive)
            {
                Projectile.Kill();
                return;
            }

            Projectile.timeLeft = 2;

            float index = Projectile.ai[0];
            float total = Projectile.ai[1];
            if (total <= 0f)
            {
                total = 2f;
            }

            float rotation = (Main.GameUpdateCount * OrbitSpeed) + index * MathHelper.TwoPi / total;
            Vector2 offset = rotation.ToRotationVector2() * OrbitRadius;
            Projectile.Center = owner.Center + offset;
            Projectile.velocity = owner.velocity;

            Lighting.AddLight(Projectile.Center, 0.55f, 0.2f, 0.15f);

            if (Projectile.localAI[0]++ >= MarkCooldown)
            {
                Projectile.localAI[0] = 0f;
                if (Projectile.owner == Main.myPlayer)
                {
                    NPC target = FindTarget(Projectile.Center, MarkRange);
                    if (target != null)
                    {
                        target.AddBuff(ModContent.BuffType<ThermalMarkDebuff>(), 300);
                        Vector2 burstDirection = (target.Center - Projectile.Center).SafeNormalize(Vector2.UnitY);
                        for (int i = 0; i < 6; i++)
                        {
                            Dust dust = Dust.NewDustDirect(Projectile.Center, 0, 0, DustID.Torch, burstDirection.X * 4f, burstDirection.Y * 4f, 120, default, 1.1f);
                            dust.noGravity = true;
                        }
                    }
                }
            }
        }

        private static NPC FindTarget(Vector2 center, float range)
        {
            NPC selected = null;
            float sqrRange = range * range;
            for (int i = 0; i < Main.maxNPCs; i++)
            {
                NPC npc = Main.npc[i];
                if (!npc.active || npc.friendly || npc.dontTakeDamage || npc.life <= 0)
                {
                    continue;
                }

                float dist = Vector2.DistanceSquared(center, npc.Center);
                if (dist < sqrRange && Collision.CanHitLine(center, 0, 0, npc.Center, 0, 0))
                {
                    sqrRange = dist;
                    selected = npc;
                }
            }

            return selected;
        }
    }
}