src/entities/towers/kinds/basic.js

import * as THREE from "three";
import { Projectile } from "../../Projectile.js";
import { findNearestWithinRange } from "../common/targeting.js";

const VISUAL_TOP_INCREMENT = 0.08;
const VISUAL_TOP_CAP = 0.4;

export default {
  key: "basic",

  buildHead(tower) {
    const headGeo = new THREE.BoxGeometry(0.8, 0.4, 0.8);
    const headMat = new THREE.MeshStandardMaterial({
      color: 0x90caf9,
      metalness: 0.18,
      roughness: 0.45,
      emissive: 0x000000,
      emissiveIntensity: 0.6,
      side: THREE.DoubleSide,
    });

    const head = new THREE.Mesh(headGeo, headMat);
    head.castShadow = true;
    head.position.set(0, 0.8, 0);
    tower.baseMesh.add(head);

    tower.headMesh = head;
    tower.head = head;
    tower.headTopY = tower.mesh.position.y + head.position.y + 0.4;
  },

  tryFire(tower, dt, enemies, projectiles, projectileSpeed) {
    tower.fireCooldown -= dt;
    if (tower.fireCooldown > 0) return;

    const target = findNearestWithinRange(tower, enemies);
    if (!target) return;

    const dir = new THREE.Vector3().subVectors(
      target.mesh.position,
      tower.position
    );
    const yaw = Math.atan2(dir.x, dir.z);
    tower.mesh.rotation.y = yaw;

    tower.fireCooldown = 1 / tower.rate;

    const spawnY =
      typeof tower.headTopY === "number" ? tower.headTopY - 0.1 : 0.9;
    const proj = new Projectile(
      tower.position.clone().add(new THREE.Vector3(0, spawnY, 0)),
      target,
      projectileSpeed,
      tower.scene,
      tower.projectileEffect || null
    );
    proj.damage = tower.damage;
    projectiles.push(proj);

    tower.playShootSound();
  },

  applyVisualLevel(tower) {
    const lvl = tower.level;
    const head = tower.headMesh;
    if (!head) return;

    const baseMat = tower.baseMesh?.material;
    const headMat = head.material;

    if (tower.levelRing) {
      tower.scene.remove(tower.levelRing);
      tower.levelRing.geometry.dispose();
      if (tower.levelRing.material?.dispose) tower.levelRing.material.dispose();
      tower.levelRing = null;
    }

    // No height increment on level gain — only rings should reflect level

    if (lvl <= 1) {
      if (baseMat) {
        baseMat.color?.set?.(0x5c6bc0);
        baseMat.emissive?.set?.(0x000000);
        baseMat.emissiveIntensity = 0.0;
      }

      // Keep original head height/position; recompute top using current head position
      tower.headTopY = (tower.mesh?.position.y ?? 0.25) + head.position.y + 0.4;

      headMat.color?.set?.(0x90caf9);
      headMat.emissive?.set?.(0x4a0a2a);
      headMat.emissiveIntensity = 0.2;
    } else {
      if (baseMat) {
        baseMat.color?.set?.(0x6f7bd6);
        baseMat.emissive?.set?.(0x2a0a1a);
        baseMat.emissiveIntensity = 0.08;
      }

      // Keep original head height/position; recompute top using current head position
      tower.headTopY = (tower.mesh?.position.y ?? 0.25) + head.position.y + 0.4;

      headMat.color?.set?.(0xa5d6ff);
      headMat.emissive?.set?.(0x9a135a);
      headMat.emissiveIntensity = 0.35;

      const ringGeom = new THREE.TorusGeometry(0.45, 0.035, 8, 24);
      const ringMat = new THREE.MeshStandardMaterial({
        color: 0x3aa6ff,
        emissive: 0xe01a6b,
        emissiveIntensity: 0.55,
        metalness: 0.3,
        roughness: 0.45,
      });
      const ring = new THREE.Mesh(ringGeom, ringMat);
      ring.castShadow = false;
      ring.receiveShadow = false;

      const topY = tower.headTopY ?? head.position.y + 0.8;
      ring.position.set(
        tower.mesh.position.x,
        topY + 0.02,
        tower.mesh.position.z
      );
      ring.rotation.x = Math.PI / 2;
      ring.name = "tower_level_ring";

      tower.levelRing = ring;
      tower.scene.add(ring);
    }
  },
};