hidden-spectre/js/ghost.js

import * as THREE from "three";

// Palette of ghost tints (matching the supernatural neon aesthetic)
const GHOST_TINTS = [
  { core: 0x9fe6ff, glow: 0x2ffbe6, name: "WISP" },
  { core: 0xff9fd0, glow: 0xff2d8f, name: "POLTERGEIST" },
  { core: 0xd4ff9f, glow: 0xb6ff3c, name: "PHANTOM" },
  { core: 0xc9b3ff, glow: 0x9b6dff, name: "SHADE" },
];

export class Ghost {
  constructor(scene, position) {
    this.scene = scene;
    this.tint = GHOST_TINTS[Math.floor(Math.random() * GHOST_TINTS.length)];
    this.group = new THREE.Group();
    this.group.position.copy(position);
    this.basePos = position.clone();
    this.captured = false;
    this.escaped = false;
    this.captureProgress = 0;
    this.spawnTime = performance.now();
    this.lifespan = 14000 + Math.random() * 8000; // 14–22s before it flees
    this.phase = Math.random() * Math.PI * 2;
    this.bobSpeed = 0.6 + Math.random() * 0.5;
    this.drift = new THREE.Vector3(
      (Math.random() - 0.5) * 0.0006,
      (Math.random() - 0.5) * 0.0003,
      (Math.random() - 0.5) * 0.0006
    );

    this._build();
    scene.add(this.group);
  }

  _build() {
    const t = this.tint;

    // Body — a softened rounded blob (sphere squished + tail)
    const bodyGeo = new THREE.SphereGeometry(0.16, 24, 24);
    bodyGeo.scale(1, 1.15, 1);
    const bodyMat = new THREE.MeshBasicMaterial({
      color: t.core, transparent: true, opacity: 0.55,
    });
    this.body = new THREE.Mesh(bodyGeo, bodyMat);
    this.group.add(this.body);

    // Inner glow core
    const coreMat = new THREE.MeshBasicMaterial({
      color: t.glow, transparent: true, opacity: 0.35,
    });
    const core = new THREE.Mesh(new THREE.SphereGeometry(0.1, 16, 16), coreMat);
    core.position.y = 0.02;
    this.group.add(core);

    // Outer halo (sprite-like additive shell)
    const haloMat = new THREE.MeshBasicMaterial({
      color: t.glow, transparent: true, opacity: 0.12,
      blending: THREE.AdditiveBlending, side: THREE.BackSide,
    });
    this.halo = new THREE.Mesh(new THREE.SphereGeometry(0.26, 20, 20), haloMat);
    this.group.add(this.halo);

    // Wispy tail tendrils
    this.tendrils = [];
    for (let i = 0; i < 3; i++) {
      const tendril = new THREE.Mesh(
        new THREE.ConeGeometry(0.05, 0.22, 8),
        new THREE.MeshBasicMaterial({ color: t.core, transparent: true, opacity: 0.4 })
      );
      tendril.position.set((i - 1) * 0.06, -0.18, 0);
      tendril.rotation.x = Math.PI;
      this.group.add(tendril);
      this.tendrils.push(tendril);
    }

    // Eyes (two dark voids)
    const eyeMat = new THREE.MeshBasicMaterial({ color: 0x05070f });
    const eyeGeo = new THREE.SphereGeometry(0.022, 10, 10);
    const eyeL = new THREE.Mesh(eyeGeo, eyeMat);
    const eyeR = new THREE.Mesh(eyeGeo, eyeMat);
    eyeL.position.set(-0.05, 0.03, 0.14);
    eyeR.position.set(0.05, 0.03, 0.14);
    this.group.add(eyeL, eyeR);
  }

  update(dt, camera) {
    if (this.captured || this.escaped) return;

    const now = performance.now();
    const age = now - this.spawnTime;

    // Bob + sway
    const tt = now * 0.001;
    this.group.position.x = this.basePos.x + Math.sin(tt * this.bobSpeed + this.phase) * 0.05;
    this.group.position.y = this.basePos.y + Math.sin(tt * this.bobSpeed * 1.3 + this.phase) * 0.06;
    this.group.position.z = this.basePos.z + Math.cos(tt * this.bobSpeed + this.phase) * 0.05;

    // Slow wandering drift
    this.basePos.add(this.drift);

    // Tendril wiggle
    this.tendrils.forEach((td, i) => {
      td.rotation.z = Math.sin(tt * 3 + i) * 0.3;
    });

    // Halo pulse
    const pulse = 1 + Math.sin(tt * 2) * 0.08;
    this.halo.scale.setScalar(pulse);

    // Always face the camera-ish (billboard the eyes)
    if (camera) this.group.lookAt(camera.position.x, this.group.position.y, camera.position.z);

    // If being captured, shrink & spin
    if (this.captureProgress > 0) {
      const s = 1 - this.captureProgress * 0.5;
      this.group.scale.setScalar(s);
      this.group.rotation.y += dt * 6;
    }

    // Flee when lifespan exceeded
    if (age > this.lifespan && this.captureProgress < 0.05) {
      this.escaped = true;
    }
  }

  // Returns the ghost's world position
  getWorldPosition(target) {
    return this.group.getWorldPosition(target);
  }

  setCaptureProgress(p) {
    this.captureProgress = Math.min(1, Math.max(0, p));
  }

  capture() {
    this.captured = true;
    return this.tint.name;
  }

  dispose() {
    this.scene.remove(this.group);
    this.group.traverse((o) => {
      if (o.geometry) o.geometry.dispose();
      if (o.material) o.material.dispose();
    });
  }
}

export { GHOST_TINTS };