// Who's-here list (SOCIAL_RESET brief, Feature 4). Hold Tab: a translucent list
// of the DJs in the booth (you first), each with their avatar hue as a swatch.
// Pure view — the data comes from NetClient's roster; no network of its own.

import { bodyCss, type AvatarLook } from '../net/avatarLook';

export interface RosterEntry {
  id: number;
  name: string;
  look: AvatarLook;
}

export class Roster {
  private readonly el: HTMLDivElement;
  private peers: RosterEntry[] = [];
  private self: { name: string; look: AvatarLook };
  private shown = false;

  constructor(self: { name: string; look: AvatarLook }) {
    this.self = self;
    this.injectStyle();
    this.el = document.createElement('div');
    this.el.className = 'tcr-panel hidden';
    document.body.appendChild(this.el);

    window.addEventListener('keydown', this.onDown);
    window.addEventListener('keyup', this.onUp);
    // Tab can steal focus / fire blur — hide defensively.
    window.addEventListener('blur', () => this.show(false));
  }

  /** Local player's name/look (the mirror can change live). */
  setSelf(self: { name: string; look: AvatarLook }): void {
    this.self = self;
    if (this.shown) this.render();
  }

  setPeers(peers: RosterEntry[]): void {
    this.peers = peers;
    if (this.shown) this.render();
  }

  private onDown = (e: KeyboardEvent): void => {
    if (e.code !== 'Tab') return;
    e.preventDefault(); // don't tab-focus the page furniture
    if (!e.repeat) this.show(true);
  };

  private onUp = (e: KeyboardEvent): void => {
    if (e.code !== 'Tab') return;
    e.preventDefault();
    this.show(false);
  };

  private show(v: boolean): void {
    if (v === this.shown) return;
    this.shown = v;
    if (v) this.render();
    this.el.classList.toggle('hidden', !v);
  }

  private render(): void {
    const rows: string[] = [];
    const row = (name: string, css: string, you: boolean) =>
      `<div class="tcr-row"><i style="background:${css}"></i>` +
      `<span>${escapeHtml(name)}</span>${you ? '<b>you</b>' : ''}</div>`;

    rows.push(row(this.self.name || 'you', bodyCss(this.self.look, 0), true));
    for (const p of this.peers) rows.push(row(p.name, bodyCss(p.look, p.id), false));

    const n = this.peers.length + 1;
    this.el.innerHTML =
      `<div class="tcr-head">IN THE BOOTH — ${n} DJ${n === 1 ? '' : 's'}</div>${rows.join('')}`;
  }

  dispose(): void {
    window.removeEventListener('keydown', this.onDown);
    window.removeEventListener('keyup', this.onUp);
    this.el.remove();
  }

  private injectStyle(): void {
    const css = document.createElement('style');
    css.textContent = `
.tcr-panel{position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);z-index:45;
  min-width:240px;max-height:70vh;overflow-y:auto;background:rgba(12,10,8,0.82);
  border:1px solid #4a4234;border-radius:10px;padding:12px 14px;
  font:12px/1.6 ui-monospace,monospace;color:#d8cdb4;pointer-events:none;
  backdrop-filter:blur(2px)}
.tcr-panel.hidden{display:none}
.tcr-head{color:#ffb028;font-size:11px;letter-spacing:.15em;margin-bottom:8px}
.tcr-row{display:flex;align-items:center;gap:9px;padding:3px 0}
.tcr-row i{width:12px;height:12px;border-radius:3px;flex:none;
  border:1px solid rgba(255,255,255,0.18)}
.tcr-row b{margin-left:auto;color:#7ec46a;font-weight:400;font-size:10px;letter-spacing:.1em}`;
    document.head.appendChild(css);
  }
}

/** Names are server-sanitized, but this is user-controlled text in innerHTML. */
function escapeHtml(s: string): string {
  return s.replace(/[&<>"']/g, (c) =>
    ({ '&': '&amp;', '<': '&lt;', '>': '&gt;', '"': '&quot;', "'": '&#39;' }[c] as string));
}