import {
  $answerResult,
  $audio,
  $guessArtist,
  $guessTitle,
  $npArtist,
  $npTitle,
  $npYear,
} from './dom.js';
import { state } from './state.js';
import { cacheLastRoomId, cacheSessionId, sendMsg } from './ws.js';
import { renderRoom } from './render.js';
import { applySync } from './audio.js';

function updatePlayerIdFromRoom(r) {
  try {
    if (r?.players?.length === 1) {
      const only = r.players[0];
      if (only && only.id && only.id !== state.playerId) {
        state.playerId = only.id;
        try {
          localStorage.setItem('playerId', only.id);
        } catch {}
      }
    }
  } catch {}
}

function shortName(id) {
  if (!id) return '-';
  const p = state.room?.players.find((x) => x.id === id);
  return p ? p.name : id.slice(0, 4);
}

export function handleConnected(msg) {
  state.playerId = msg.playerId;
  try {
    if (msg.playerId) localStorage.setItem('playerId', msg.playerId);
  } catch {}
  if (msg.sessionId) {
    const existing = localStorage.getItem('sessionId');
    if (!existing) cacheSessionId(msg.sessionId);
  }

  // lazy import to avoid cycle
  import('./session.js').then(({ reusePlayerName, reconnectLastRoom }) => {
    reusePlayerName();
    reconnectLastRoom();
  });

  if (state.room) {
    try {
      updatePlayerIdFromRoom(state.room);
      renderRoom(state.room);
    } catch {}
  }
}

export function handleRoomUpdate(msg) {
  if (msg?.room?.id) cacheLastRoomId(msg.room.id);
  const r = msg.room;
  updatePlayerIdFromRoom(r);
  renderRoom(r);
}

export function handlePlayTrack(msg) {
  const t = msg.track;
  state.lastTrack = t;
  state.revealed = false;
  $npTitle.textContent = '???';
  $npArtist.textContent = '';
  $npYear.textContent = '';
  if ($guessTitle) $guessTitle.value = '';
  if ($guessArtist) $guessArtist.value = '';
  if ($answerResult) {
    $answerResult.textContent = '';
    $answerResult.className = 'mt-1 text-sm';
  }
  try {
    $audio.preload = 'auto';
  } catch {}
  $audio.src = t.url;
  const pf = document.getElementById('progressFill');
  if (pf) pf.style.width = '0%';
  const rd = document.getElementById('recordDisc');
  if (rd) {
    rd.classList.remove('spin-record');
    rd.src = '/hitstar.png';
  }
  const { startAt, serverNow } = msg;
  const now = Date.now();
  const offsetMs = startAt - serverNow;
  const localStart = now + offsetMs;
  const delay = Math.max(0, localStart - now);
  setTimeout(() => {
    $audio.currentTime = 0;
    $audio.play().catch(() => {});
    const disc = document.getElementById('recordDisc');
    if (disc) disc.classList.add('spin-record');
  }, delay);
  if (state.room) renderRoom(state.room);
}

export function handleSync(msg) {
  applySync(msg.startAt, msg.serverNow);
}

export function handleControl(msg) {
  const { action, startAt, serverNow } = msg;
  if (action === 'pause') {
    $audio.pause();
    const disc = document.getElementById('recordDisc');
    if (disc) disc.classList.remove('spin-record');
    $audio.playbackRate = 1.0;
  } else if (action === 'play') {
    if (startAt && serverNow) {
      const now = Date.now();
      const elapsed = (now - startAt) / 1000;
      $audio.currentTime = Math.max(0, elapsed);
    }
    $audio.play().catch(() => {});
    const disc = document.getElementById('recordDisc');
    if (disc) disc.classList.add('spin-record');
  }
}

export function handleReveal(msg) {
  const { result, track } = msg;
  $npTitle.textContent = track.title || track.id || 'Track';
  $npArtist.textContent = track.artist ? ` – ${track.artist}` : '';
  $npYear.textContent = track.year ? ` (${track.year})` : '';
  state.revealed = true;
  const $rb = document.getElementById('revealBanner');
  if ($rb) {
    if (result.correct) {
      $rb.textContent = 'Richtig!';
      $rb.className =
        'inline-block rounded-md bg-emerald-600 text-white px-3 py-1 text-sm font-medium';
    } else {
      $rb.textContent = 'Falsch!';
      $rb.className =
        'inline-block rounded-md bg-rose-600 text-white px-3 py-1 text-sm font-medium';
    }
  }
  const $placeArea = document.getElementById('placeArea');
  if ($placeArea) $placeArea.classList.add('hidden');
  const rd = document.getElementById('recordDisc');
  if (rd && track?.id) {
    const coverUrl = `/cover/${encodeURIComponent(track.id)}`;
    const img = new Image();
    img.onload = () => {
      rd.src = coverUrl;
    };
    img.onerror = () => {
      /* keep default logo */
    };
    img.src = `${coverUrl}?t=${Date.now()}`;
  }
}

export function handleGameEnded(msg) {
  alert(`Gewinner: ${shortName(msg.winner)}`);
}

export function onMessage(ev) {
  const msg = JSON.parse(ev.data);
  switch (msg.type) {
    case 'resume_result': {
      if (msg.ok) {
        if (msg.playerId) {
          state.playerId = msg.playerId;
          try {
            localStorage.setItem('playerId', msg.playerId);
          } catch {}
        }
        const code = msg.roomId || state.room?.id || localStorage.getItem('lastRoomId');
        if (code) sendMsg({ type: 'join_room', code });
        if (state.room) {
          try {
            renderRoom(state.room);
          } catch {}
        }
      } else {
        const code = state.room?.id || localStorage.getItem('lastRoomId');
        if (code) sendMsg({ type: 'join_room', code });
      }
      return;
    }
    case 'connected':
      return handleConnected(msg);
    case 'room_update':
      return handleRoomUpdate(msg);
    case 'play_track':
      return handlePlayTrack(msg);
    case 'sync':
      return handleSync(msg);
    case 'control':
      return handleControl(msg);
    case 'reveal':
      return handleReveal(msg);
    case 'game_ended':
      return handleGameEnded(msg);
    case 'answer_result': {
      if ($answerResult) {
        if (!msg.ok) {
          $answerResult.textContent = '⛔ Eingabe ungültig oder gerade nicht möglich';
          $answerResult.className = 'mt-1 text-sm text-rose-600';
        } else {
          const okBoth = !!(msg.correctTitle && msg.correctArtist);
          const parts = [];
          parts.push(msg.correctTitle ? 'Titel ✓' : 'Titel ✗');
          parts.push(msg.correctArtist ? 'Künstler ✓' : 'Künstler ✗');
          let coin = '';
          if (msg.awarded) coin = ' +1 Token';
          else if (msg.alreadyAwarded) coin = ' (bereits erhalten)';
          $answerResult.textContent = `${parts.join(' · ')}${coin}`;
          $answerResult.className = okBoth
            ? 'mt-1 text-sm text-emerald-600'
            : 'mt-1 text-sm text-amber-600';
        }
      }
      return;
    }
    default:
      return;
  }
}