import { useEffect, useState } from 'react';
import { clock } from '../lib/labels.js';
import MapImage from './MapImage.jsx';
import SideIcon from './SideIcon.jsx';

const STEP_SHORT = { ban: 'Ban', pick: 'Pick', side: 'Seite', decider: 'Decider' };

export default function VetoBoard({ state, viewer, act, busy, compact = false }) {
  const { veto, teams } = state;
  const { current } = veto;
  const [selected, setSelected] = useState(null);
  useEffect(() => setSelected(null), [current?.index]);
  const left = useCountdown(veto.remainingMs);

  const mapsById = Object.fromEntries(state.maps.map((m) => [m.id, m]));
  const yourTurn = !!current && viewer.isCaptain && viewer.team === current.team;
  const choosingMap = yourTurn && (current.type === 'ban' || current.type === 'pick');
  const sideMap = current?.type === 'side' ? mapsById[current.map] : null;

  const submitMap = () => act('veto/action', { stepIndex: current.index, map: selected });
  const submitSide = (side) => act('veto/action', { stepIndex: current.index, side });

  return (
    <div className={`veto ${compact ? 'veto-compact' : ''}`}>
      {current && (
        <div className={`turn turn-${current.team} ${yourTurn ? 'is-you' : ''}`} aria-live="polite">
          <span className="turn-team">{teams[current.team].name}</span>
          <span className="turn-action">
            {current.type === 'ban' && 'bannt eine Map'}
            {current.type === 'pick' && 'wählt eine Map'}
            {current.type === 'side' && `wählt die Startseite auf ${sideMap?.name}`}
          </span>
          <span className="turn-hint">
            {yourTurn
              ? 'Du bist am Zug.'
              : viewer.team === current.team
                ? 'Dein Captain entscheidet.'
                : !viewer.team
                  ? 'Live-Ansicht – nur Captains können wählen.'
                  : 'Das andere Team ist am Zug.'}
          </span>
          {left !== null && <TimerBar left={left} totalMs={(veto.stepSeconds || 30) * 1000} />}
        </div>
      )}
      {!current && veto.done && !compact && <div className="turn turn-done">Veto abgeschlossen</div>}

      <div className="map-grid" role="list">
        {veto.maps.map((m) => {
          const meta = mapsById[m.id];
          const selectable = choosingMap && m.status === 'available';
          const isSel = selected === m.id;
          return (
            <button
              key={m.id}
              type="button"
              role="listitem"
              className={`map-tile status-${m.status} ${m.by ? `by-${m.by}` : ''} ${isSel ? `is-selected sel-${current.type}` : ''} ${sideMap?.id === m.id ? 'is-side' : ''}`}
              style={{ '--map': meta?.color ?? '#556' }}
              disabled={!selectable || !!busy}
              onClick={() => setSelected(isSel ? null : m.id)}
              aria-pressed={isSel}
              aria-label={`${meta.name}: ${statusText(m, teams)}`}
            >
              <MapImage map={meta} />
              <span className="map-name">{meta.name}</span>
              <span className="map-status">{statusText(m, teams)}</span>
            </button>
          );
        })}
      </div>

      {choosingMap && (
        <div className="veto-confirm">
          <button className={`btn btn-lg ${current.type === 'ban' ? 'btn-danger' : 'btn-primary'}`} disabled={!selected || !!busy} onClick={submitMap}>
            {selected
              ? `${mapsById[selected].name} ${current.type === 'ban' ? 'bannen' : 'wählen'}`
              : `Map zum ${current.type === 'ban' ? 'Bannen' : 'Wählen'} antippen`}
          </button>
        </div>
      )}

      {yourTurn && current.type === 'side' && (
        <div className="side-choice">
          <MapImage map={sideMap} className="side-choice-art" />
          <div className="side-choice-body">
            <p>Auf welcher Seite startet <strong>{teams[viewer.team].name}</strong> auf <strong>{sideMap?.name}</strong>?</p>
            <div className="side-options">
              <button className="side-option side-option-ct" disabled={!!busy} onClick={() => submitSide('CT')}>
                <SideIcon side="CT" size={44} />
                <span className="side-option-name">Counter-Terrorists</span>
                <span className="side-option-sub">Start auf CT, Gegner beginnt als T</span>
              </button>
              <button className="side-option side-option-t" disabled={!!busy} onClick={() => submitSide('T')}>
                <SideIcon side="T" size={44} />
                <span className="side-option-name">Terrorists</span>
                <span className="side-option-sub">Start auf T, Gegner beginnt als CT</span>
              </button>
            </div>
          </div>
        </div>
      )}

      <ol className="step-track" aria-label="Veto-Ablauf">
        {veto.steps.map((s) => (
          <li key={s.index} className={`step step-${s.type} ${s.team ? `step-${s.team}` : ''} ${s.done ? 'done' : ''} ${current?.index === s.index ? 'now' : ''}`}
            title={s.team ? `${teams[s.team].name}: ${STEP_SHORT[s.type]}` : 'Übrig gebliebene Map'}>
            <span>{STEP_SHORT[s.type]}</span>
            <small>{s.team ? teams[s.team].name : 'automatisch'}</small>
          </li>
        ))}
      </ol>

      {veto.history.length > 0 && !compact && (
        <ol className="veto-history">
          {veto.history.map((h) => (
            <li key={h.index} className={`hist-${h.type} ${h.team ? `hist-${h.team}` : ''}`}>
              <time>{clock(h.at)}</time> {h.text}
            </li>
          ))}
        </ol>
      )}
    </div>
  );
}

function statusText(m, teams) {
  switch (m.status) {
    case 'banned': return `Gebannt von ${teams[m.by].name}`;
    case 'picked': return `Gewählt von ${teams[m.by].name}`;
    case 'decider': return 'Entscheidungsmap';
    default: return 'Verfügbar';
  }
}

/** Leiste für die verbleibende Zeit des Veto-Schritts. In den letzten 10 Sekunden wird sie rot. */
function TimerBar({ left, totalMs }) {
  const seconds = Math.ceil(left / 1000);
  const percent = Math.max(0, Math.min(100, (left / totalMs) * 100));
  return (
    <div className={`turn-timer ${left <= 10_000 ? 'is-low' : ''}`} role="timer" aria-label={`Noch ${seconds} Sekunden`}>
      <div className="turn-bar"><span style={{ width: `${percent}%` }} /></div>
      <span className="turn-seconds">{seconds} s</span>
    </div>
  );
}

/** Verbleibende Zeit des Veto-Schritts: der Server setzt sie bei jeder Änderung, danach zählt die Anzeige lokal herunter. */
function useCountdown(ms) {
  const [left, setLeft] = useState(ms ?? null);
  useEffect(() => {
    setLeft(ms ?? null);
    if (ms == null) return undefined;
    const started = Date.now();
    const t = setInterval(() => setLeft(Math.max(0, ms - (Date.now() - started))), 250);
    return () => clearInterval(t);
  }, [ms]);
  return left;
}