using System;
using System.Collections.Generic;
using Microsoft.Xna.Framework;
using Terraria;
using Terraria.Audio;
using Terraria.ID;
using Terraria.ModLoader;
using Terraria.ModLoader.IO;
using Terraria.ObjectData;

namespace Emiliasmod.Content.Projectiles
{
	[Autoload(false)]
	public class SpaceBlasterProjectile : ModProjectile
	{
		public int JumpsLeft = 10;
		private readonly List<int> hitTargets = [];

		public override void SetDefaults() {
			Projectile.width = 4;
			Projectile.height = 4;
			Projectile.friendly = true;
			Projectile.DamageType = DamageClass.Generic;
			Projectile.extraUpdates = 100;
			Projectile.tileCollide = true;
			Projectile.timeLeft = 600;
			Projectile.CritChance = 0;
			Projectile.penetrate = -1;
		}
		public override void OnHitNPC(NPC target, NPC.HitInfo hit, int damageDone) {
			if (JumpsLeft <= 0) {
				Projectile.Kill();
				hitTargets.Clear();
				return;
			}

			hitTargets.Add(target.whoAmI);
			target.AddBuff(BuffID.Electrified, 600);
			target.AddBuff(BuffID.Frozen, 600);
			target.AddBuff(BuffID.OnFire, 120);
			//Vector2 launchVelocity = new Vector2(0, -0.5f);
			//launchVelocity = launchVelocity.RotatedBy(MathHelper.PiOver2);
			//Vector2 pos = target.Center;
			//pos.Y += 4f;
			//Projectile.NewProjectileDirect(Projectile.InheritSource(Projectile), pos, launchVelocity, ProjectileID.ThunderSpearShot, 100, 0, -1, 44);
			JumpsLeft--;

			NPC nextTarget = FindNextTarget(target.Center, 400f); // 25 tile radius
			if (nextTarget != null) {
				// Visual: Draw a line of dust between targets
				DrawLightning(target.Center, nextTarget.Center);

				// Snap projectile to next target
				Projectile.Center = target.Center;
				Projectile.velocity = (nextTarget.Center - target.Center).SafeNormalize(Vector2.Zero) * 16f;
			} else {
				Projectile.Kill();
				hitTargets.Clear();
			}
		}

		private NPC FindNextTarget(Vector2 origin, float range) {
			NPC closest = null;
			float closestDistSq = range * range; // Use squared distance to avoid sqrt in loop

			for (int i = 0; i < Main.maxNPCs; i++) {
				NPC npc = Main.npc[i];
				
				if (npc.active && npc.CanBeChasedBy() && !hitTargets.Contains(npc.whoAmI)) {
					float distSq = Vector2.DistanceSquared(origin, npc.Center);
					
					if (distSq < closestDistSq) {
						// Check collision last (most expensive check)
						if (Collision.CanHitLine(origin, 1, 1, npc.position, npc.width, npc.height)) {
							closestDistSq = distSq;
							closest = npc;
						}
					}
				}
			}
			return closest;
		}

		private static void DrawLightning(Vector2 start, Vector2 end) {
			int count = (int)(Vector2.Distance(start, end) / 8f);
			for (int i = 0; i < count; i++) {
					
				Vector2 pos = Vector2.Lerp(start, end, i / (float)count);
				if (Main.rand.NextBool(10)) {
					Dust d1 = Dust.NewDustDirect(pos, 0, 0, DustID.Electric, Main.rand.Next(-3, 4), Main.rand.Next(-3, 4), 0, Color.Cyan, 0.8f);
					d1.noGravity = true;
				}
				Dust d2 = Dust.NewDustPerfect(pos, DustID.Electric, Vector2.Zero, 100, Color.Cyan, 0.8f);
				d2.noGravity = true;
				Lighting.AddLight(pos, Color.Cyan.ToVector3());//may not be usefull
			}
		}
	}
}