// net.js — WebSocket-Client: Verbindung, Reconnect, Protokoll (siehe Spec 9.2).
// Kennt die 3D-Welt nicht — reicht Ereignisse per Callbacks nach oben.

export class Net {
  /**
   * @param {object} handlers - onWelcome(id,users), onJoin(user), onLeave(id),
   *   onUpdate(id,p,rot), onStatus(id,label), onHelp(id,on), onNet(text,color)
   */
  constructor(handlers) {
    this.h = handlers;
    this.ws = null;
    this.myId = null;
    this.started = false;
    this.name = 'Gast';
    this.role = 'student';
    this.startPos = [0, 0, 8];
  }

  connect(name, role, startPos) {
    this.name = name;
    this.role = role;
    if (startPos) this.startPos = [startPos.x, startPos.y, startPos.z];
    this.started = true;
    this._open();
  }

  _open() {
    const url = (location.protocol === 'https:' ? 'wss://' : 'ws://') + location.host + '/ws';
    this._net('verbinde …');
    const ws = new WebSocket(url);
    this.ws = ws;
    ws.onopen = () => {
      this._net('verbunden', '#a6e3a1');
      ws.send(JSON.stringify({ t: 'hello', name: this.name, role: this.role, p: this.startPos }));
    };
    ws.onclose = () => {
      this._net('getrennt — reconnect …', '#f38ba8');
      this.myId = null;
      setTimeout(() => { if (this.started) this._open(); }, 1500);
    };
    ws.onerror = () => this._net('Fehler', '#f38ba8');
    ws.onmessage = (ev) => this._recv(ev);
  }

  _recv(ev) {
    let m;
    try { m = JSON.parse(ev.data); } catch { return; }
    const h = this.h;
    switch (m.t) {
      case 'welcome': this.myId = m.id; h.onWelcome(m.id, m.users); break;
      case 'join': h.onJoin(m.user); break;
      case 'leave': h.onLeave(m.id); break;
      case 'update': h.onUpdate(m.id, m.p, m.rot); break;
      case 'status': h.onStatus(m.id, m.label); break;
      case 'help': h.onHelp(m.id, m.on); break;
    }
  }

  get connected() { return this.ws && this.ws.readyState === 1 && this.myId != null; }

  sendMove(p, rot, anim) { if (this.connected) this.ws.send(JSON.stringify({ t: 'move', p, rot, anim })); }
  sendHelp(on) { if (this.connected) this.ws.send(JSON.stringify({ t: 'help', on })); }
  sendStatus(label) { if (this.connected) this.ws.send(JSON.stringify({ t: 'status', label })); }

  _net(text, color) { if (this.h.onNet) this.h.onNet(text, color); }
}