// avatars.js — Verwaltung der fremden Avatare: Erzeugen, Namensschild, Interpolation.
import * as THREE from 'three';

const BODY_GEO = new THREE.CapsuleGeometry(0.35, 0.9, 4, 8);
const NOSE_GEO = new THREE.ConeGeometry(0.12, 0.25, 8); // zeigt Blickrichtung

export class Avatars {
  constructor(scene) {
    this.scene = scene;
    this.map = new Map(); // id -> Eintrag
  }

  get count() { return this.map.size; }

  add(user) {
    if (this.map.has(user.id)) return;
    const group = new THREE.Group();
    const mat = new THREE.MeshStandardMaterial({ color: colorFor(user.id), roughness: 0.6 });

    const body = new THREE.Mesh(BODY_GEO, mat);
    body.position.y = 1.05; body.castShadow = true; group.add(body);

    const nose = new THREE.Mesh(NOSE_GEO, mat);
    nose.rotation.x = Math.PI / 2; nose.position.set(0, 1.3, -0.4); group.add(nose);

    const entry = {
      group, mat,
      name: user.name,
      statusLabel: user.label || '',
      help: !!user.help,
      label: null,
      target: { p: [...user.p], rot: user.rot || 0 },
      cur: { p: [...user.p], rot: user.rot || 0 },
    };
    entry.label = makeLabel(labelText(entry), entry.help);
    group.add(entry.label);
    group.position.set(user.p[0], user.p[1], user.p[2]);
    group.rotation.y = user.rot || 0;

    this.scene.add(group);
    this.map.set(user.id, entry);
  }

  remove(id) {
    const e = this.map.get(id);
    if (!e) return;
    this.scene.remove(e.group);
    e.label.material.map.dispose();
    this.map.delete(id);
  }

  setTarget(id, p, rot) { const e = this.map.get(id); if (e) { e.target.p = p; e.target.rot = rot; } }
  setStatus(id, label) { const e = this.map.get(id); if (e) { e.statusLabel = label; this._refresh(e); } }
  setHelp(id, on) { const e = this.map.get(id); if (e) { e.help = on; this._refresh(e); } }

  /** Pro Frame: fremde Avatare weich zur letzten bekannten Zielposition interpolieren. */
  update(dt) {
    const a = 1 - Math.pow(0.001, dt); // framerate-unabhängiges exponentielles Glätten
    for (const e of this.map.values()) {
      e.cur.p[0] += (e.target.p[0] - e.cur.p[0]) * a;
      e.cur.p[1] += (e.target.p[1] - e.cur.p[1]) * a;
      e.cur.p[2] += (e.target.p[2] - e.cur.p[2]) * a;
      let d = e.target.rot - e.cur.rot;
      while (d > Math.PI) d -= 2 * Math.PI;
      while (d < -Math.PI) d += 2 * Math.PI;
      e.cur.rot += d * a;
      e.group.position.set(e.cur.p[0], e.cur.p[1], e.cur.p[2]);
      e.group.rotation.y = e.cur.rot;
    }
  }

  _refresh(e) {
    e.group.remove(e.label);
    e.label.material.map.dispose();
    e.label = makeLabel(labelText(e), e.help);
    e.group.add(e.label);
  }
}

// ── Hilfsfunktionen ──
function labelText(e) { return e.name + (e.statusLabel ? '  ·  ' + e.statusLabel : ''); }
function colorFor(id) { const c = new THREE.Color(); c.setHSL((id * 0.13) % 1, 0.55, 0.62); return c; }

function makeLabel(text, help) {
  const cv = document.createElement('canvas');
  cv.width = 256; cv.height = 72;
  const g = cv.getContext('2d');
  g.fillStyle = help ? 'rgba(243,139,168,.92)' : 'rgba(17,23,41,.82)';
  roundRect(g, 4, 4, 248, 64, 12); g.fill();
  g.strokeStyle = help ? '#ffd7de' : 'rgba(137,180,250,.6)'; g.lineWidth = 2; g.stroke();
  g.fillStyle = help ? '#3a1420' : '#cdd6f4';
  g.font = 'bold 30px system-ui, sans-serif'; g.textAlign = 'center'; g.textBaseline = 'middle';
  g.fillText((help ? '✋ ' : '') + text, 128, 38);

  const tex = new THREE.CanvasTexture(cv); tex.anisotropy = 4;
  const spr = new THREE.Sprite(new THREE.SpriteMaterial({ map: tex, transparent: true, depthTest: false }));
  spr.scale.set(1.8, 0.5, 1);
  spr.position.y = 2.35;
  return spr;
}

function roundRect(g, x, y, w, h, r) {
  g.beginPath();
  g.moveTo(x + r, y);
  g.arcTo(x + w, y, x + w, y + h, r);
  g.arcTo(x + w, y + h, x, y + h, r);
  g.arcTo(x, y + h, x, y, r);
  g.arcTo(x, y, x + w, y, r);
  g.closePath();
}