import { Anim } from '../../shared/characters';
import type { MatchEndMessage, PlayerInfo, PlayerState, RoundEndMessage, RoundState } from '../../shared/protocol';
import { fr } from '../i18n/fr';

const el = <K extends keyof HTMLElementTagNameMap>(tag: K, className = '', text = ''): HTMLElementTagNameMap[K] => {
  const e = document.createElement(tag);
  if (className) e.className = className;
  if (text) e.textContent = text;
  return e;
};

/** Round banner (round, timer, final rush), scoreboard and contextual hint. */
export class RoundHud {
  private readonly banner = el('div');
  private readonly label = el('div', 'label');
  private readonly timer = el('div', 'timer');
  private readonly rush = el('div', 'rush-label', fr.hud.rush);
  private readonly board = el('ul');
  private readonly hint = el('div');
  private lastKey = '';

  constructor() {
    this.banner.id = 'round-hud';
    this.board.id = 'scoreboard';
    this.hint.id = 'hint';
    this.banner.append(this.label, this.timer, this.rush);
    document.body.append(this.banner, this.board, this.hint);
    this.banner.hidden = true;
    this.board.hidden = true;
  }

  update(round: number, rounds: number, state: RoundState | null, players: Map<number, PlayerState>, infos: Map<number, PlayerInfo>, localId: number): void {
    const playing = round > 0 && state?.timeLeft != null;
    this.banner.hidden = !playing;
    this.board.hidden = !playing;
    const me = players.get(localId);
    const alive = me !== undefined && (me.anim & Anim.Dead) === 0;
    this.hint.textContent = alive && me.item === 'candle' ? fr.hud.candleHint : '';
    if (!playing || !state) return;

    const t = Math.ceil(state.timeLeft ?? 0);
    this.label.textContent = fr.hud.round(round, rounds);
    this.timer.textContent = `${Math.floor(t / 60)}:${String(t % 60).padStart(2, '0')}`;
    this.banner.classList.toggle('rush', state.finalRush);
    this.rush.hidden = !state.finalRush;

    // Rebuild the scoreboard only when something visible changed.
    const rows = [...players.values()]
      .map((p) => ({ p, name: infos.get(p.id)?.name ?? '?' }))
      .sort((a, b) => b.p.score - a.p.score || a.p.id - b.p.id);
    const holder = state.cherry?.holder ?? 0;
    const key = rows.map(({ p, name }) => `${p.id}:${name}:${p.score}:${p.anim & Anim.Dead}`).join('|') + `#${holder}`;
    if (key === this.lastKey) return;
    this.lastKey = key;
    this.board.replaceChildren(
      ...rows.map(({ p, name }) => {
        const li = el('li');
        li.append(el('span', '', name), el('span', '', String(p.score)));
        li.classList.toggle('me', p.id === localId);
        li.classList.toggle('holder', p.id === holder);
        li.classList.toggle('dead', (p.anim & Anim.Dead) !== 0);
        return li;
      }),
    );
  }
}

/** Round results and final results (with trophies) overlay. */
export class ResultsScreen {
  private readonly root = el('div');
  private timer: ReturnType<typeof setInterval> | null = null;

  constructor() {
    this.root.id = 'results';
    this.root.hidden = true;
    document.body.appendChild(this.root);
  }

  hide(): void {
    this.root.hidden = true;
    if (this.timer) clearInterval(this.timer);
    this.timer = null;
  }

  showRound(msg: RoundEndMessage, localId: number): void {
    this.show(fr.results.roundTitle(msg.round, msg.rounds), msg.results, localId, null, msg.nextIn, fr.results.next);
  }

  showMatch(msg: MatchEndMessage, localId: number): void {
    this.show(fr.results.matchTitle, msg.results, localId, msg, msg.lobbyIn, fr.results.lobby);
  }

  private show(
    title: string,
    results: RoundEndMessage['results'],
    localId: number,
    match: MatchEndMessage | null,
    seconds: number,
    footer: (s: number) => string,
  ): void {
    const card = el('div', 'menu-card');
    card.appendChild(el('h1', 'small', title));
    if (match && results[0]) card.appendChild(el('p', 'winner', fr.results.winner(results[0].name)));

    const table = el('table');
    const head = el('tr');
    for (const h of [fr.results.player, fr.results.round, fr.results.total]) head.appendChild(el('th', '', h));
    table.appendChild(head);
    for (const r of results) {
      const tr = el('tr', r.id === localId ? 'me' : '');
      tr.append(el('td', '', r.name), el('td', 'num', String(r.roundScore)), el('td', 'num', String(r.total)));
      table.appendChild(tr);
    }
    card.appendChild(table);

    if (match) {
      card.appendChild(el('h2', '', fr.results.trophies));
      const grid = el('div', 'trophies');
      const names = new Map(results.map((r) => [r.id, r.name]));
      for (const t of match.trophies) {
        const text = fr.trophies[t.id];
        if (!text) continue;
        const box = el('div', 'trophy');
        box.append(el('strong', '', `🏆 ${text.name}`), el('div', '', names.get(t.playerId) ?? '?'), el('span', '', text.desc(t.value)));
        grid.appendChild(box);
      }
      if (grid.childElementCount === 0) grid.appendChild(el('p', '', fr.results.noTrophy));
      card.appendChild(grid);
    }

    const foot = el('p', 'footer');
    card.appendChild(foot);
    this.root.replaceChildren(card);
    this.root.hidden = false;

    let left = Math.ceil(seconds);
    foot.textContent = footer(left);
    if (this.timer) clearInterval(this.timer);
    this.timer = setInterval(() => {
      left = Math.max(0, left - 1);
      foot.textContent = footer(left);
    }, 1000);
  }
}