'use strict';

const api = (path, opts = {}) =>
  fetch(path, opts).then(r => r.json()).catch(() => null);

// ── State ─────────────────────────────────────────────────────────────────────
let currentVolume = 50; // 0–100 (Windows system volume)
let pollTimer = null;

// ── DOM refs ──────────────────────────────────────────────────────────────────
const $ = id => document.getElementById(id);
const statusDot    = $('winamp-status');
const stateLabel   = $('state-label');
const trackTitle   = $('track-title');
const playlistPos  = $('playlist-pos');
const progressFill = $('progress-fill');
const timeCurrent  = $('time-current');
const timeLength   = $('time-length');
const volumeFill   = $('volume-fill');
const volumePct    = $('volume-pct');
const btnMute      = $('btn-mute');
const btnPlay      = $('btn-play');
const killistPanel = $('killist-panel');
const killistItems = $('killist-items');

// ── Playback controls ─────────────────────────────────────────────────────────
btnPlay.addEventListener('click', async () => {
  const st = await api('/api/status');
  if (!st) return;
  if (st.state === 'playing') {
    await api('/api/pause', { method: 'POST' });
  } else {
    await api('/api/play', { method: 'POST' });
  }
  poll();
});

$('btn-stop').addEventListener('click', async () => {
  await api('/api/stop', { method: 'POST' }); poll();
});
$('btn-next').addEventListener('click', async () => {
  await api('/api/next', { method: 'POST' }); poll();
});
$('btn-prev').addEventListener('click', async () => {
  await api('/api/prev', { method: 'POST' }); poll();
});

// ── Seek buttons ──────────────────────────────────────────────────────────────
document.querySelectorAll('.btn-seek').forEach(btn => {
  btn.addEventListener('click', async () => {
    const delta = parseInt(btn.dataset.delta, 10);
    await api(`/api/seek?delta=${delta}`, { method: 'POST' });
    poll();
  });
});

// ── Progress bar click-to-seek ────────────────────────────────────────────────
$('progress-bar').addEventListener('click', async e => {
  const rect = e.currentTarget.getBoundingClientRect();
  const frac = (e.clientX - rect.left) / rect.width;
  const st = await api('/api/status');
  if (!st || !st.length) return;
  const target = Math.round(frac * st.length);
  const delta = target - st.position;
  await api(`/api/seek?delta=${delta}`, { method: 'POST' });
  poll();
});

// ── Volume ────────────────────────────────────────────────────────────────────
$('btn-vol-up').addEventListener('click', async () => {
  currentVolume = Math.min(100, currentVolume + 5);
  await api(`/api/volume?level=${currentVolume}`, { method: 'POST' });
  updateVolumeFill();
});
$('btn-vol-down').addEventListener('click', async () => {
  currentVolume = Math.max(0, currentVolume - 5);
  await api(`/api/volume?level=${currentVolume}`, { method: 'POST' });
  updateVolumeFill();
});
$('volume-bar').addEventListener('click', async e => {
  const rect = e.currentTarget.getBoundingClientRect();
  currentVolume = Math.round((e.clientX - rect.left) / rect.width * 100);
  await api(`/api/volume?level=${currentVolume}`, { method: 'POST' });
  updateVolumeFill();
});
btnMute.addEventListener('click', async () => {
  const cur = await api('/api/mute');
  const newMuted = !(cur?.muted);
  await api(`/api/mute?muted=${newMuted}`, { method: 'POST' });
  updateMuteBtn(newMuted);
});

function updateVolumeFill(muted = false) {
  volumeFill.style.width = currentVolume + '%';
  volumePct.textContent  = currentVolume + ' %';
  volumeFill.classList.toggle('muted', muted);
}
function updateMuteBtn(muted) {
  btnMute.textContent = muted ? '🔇' : '🔊';
  btnMute.classList.toggle('muted', muted);
  volumeFill.classList.toggle('muted', muted);
}

// ── KillList ──────────────────────────────────────────────────────────────────
$('btn-kill').addEventListener('click', async () => {
  const res = await api('/api/killist', { method: 'POST' });
  if (res?.added) {
    showToast(`🚫 ${res.added}`);
  }
});
$('btn-show-killist').addEventListener('click', async () => {
  await refreshKillist();
  killistPanel.classList.remove('hidden');
});
$('btn-close-killist').addEventListener('click', () => {
  killistPanel.classList.add('hidden');
});
async function refreshKillist() {
  const list = await api('/api/killist');
  if (!list) return;
  killistItems.innerHTML = '';
  list.forEach(title => {
    const li = document.createElement('li');
    li.innerHTML = `<span>${escHtml(title)}</span>`;
    const btn = document.createElement('button');
    btn.textContent = '✕';
    btn.onclick = async () => {
      await api(`/api/killist?title=${encodeURIComponent(title)}`, { method: 'DELETE' });
      await refreshKillist();
    };
    li.appendChild(btn);
    killistItems.appendChild(li);
  });
}

// ── Polling ───────────────────────────────────────────────────────────────────
async function poll() {
  const st = await api('/api/status');
  if (!st) {
    statusDot.className = 'err';
    statusDot.textContent = '●';
    stateLabel.textContent = 'Keine Verbindung';
    trackTitle.textContent = '–';
    return;
  }

  if (!st.running) {
    statusDot.className = 'err';
    stateLabel.textContent = 'Winamp nicht gestartet';
    trackTitle.textContent = '–';
    return;
  }

  statusDot.className = 'ok';
  const stateMap = { playing: '▶ Spielt', paused: '⏸ Pause', stopped: '⏹ Stop' };
  stateLabel.textContent = stateMap[st.state] ?? st.state;

  trackTitle.textContent = st.title || '–';
  playlistPos.textContent = st.playlist_length
    ? `${st.playlist_pos} / ${st.playlist_length}`
    : '';

  if (st.length > 0) {
    progressFill.style.width = (st.position / st.length * 100).toFixed(1) + '%';
    timeCurrent.textContent = fmtTime(st.position);
    timeLength.textContent  = fmtTime(st.length);
  } else {
    progressFill.style.width = '0%';
  }

  // Reflect play/pause state on button
  btnPlay.textContent = st.state === 'playing' ? '⏸' : '▶';

  // System volume (always present in status response)
  if (typeof st.volume === 'number') {
    currentVolume = st.volume;
    updateVolumeFill(st.muted);
    updateMuteBtn(st.muted);
  }
}

function startPolling(intervalMs = 2000) {
  if (pollTimer) clearInterval(pollTimer);
  poll();
  pollTimer = setInterval(poll, intervalMs);
}

// ── Helpers ───────────────────────────────────────────────────────────────────
function fmtTime(secs) {
  const m = Math.floor(secs / 60);
  const s = String(Math.floor(secs % 60)).padStart(2, '0');
  return `${m}:${s}`;
}

function escHtml(str) {
  return str.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;');
}

let toastTimer;
function showToast(msg) {
  let el = document.getElementById('toast');
  if (!el) {
    el = document.createElement('div');
    el.id = 'toast';
    el.style.cssText = `
      position:fixed;bottom:24px;left:50%;transform:translateX(-50%);
      background:#333;color:#fff;padding:10px 20px;border-radius:8px;
      font-size:14px;z-index:999;opacity:0;transition:opacity .2s;
    `;
    document.body.appendChild(el);
  }
  el.textContent = msg;
  el.style.opacity = '1';
  clearTimeout(toastTimer);
  toastTimer = setTimeout(() => { el.style.opacity = '0'; }, 2500);
}

// ── Boot ──────────────────────────────────────────────────────────────────────
startPolling(2000);