const FEED_URL = '/feed';

const audio = document.getElementById('audio-element');
const stickyPlayer = document.getElementById('sticky-player');
const playerPlayBtn = document.getElementById('player-play-btn');
const playerTitle = document.getElementById('player-title');
const playerProgress = document.getElementById('player-progress');
const playerProgressFill = document.getElementById('player-progress-fill');
const playerTime = document.getElementById('player-time');
const episodesList = document.getElementById('episodes-list');

let currentEpisodeCard = null;

// Format seconds to M:SS or H:MM:SS
function formatTime(seconds) {
  if (!seconds || isNaN(seconds)) return '0:00';
  const s = Math.floor(seconds);
  const h = Math.floor(s / 3600);
  const m = Math.floor((s % 3600) / 60);
  const sec = s % 60;
  if (h > 0) return `${h}:${String(m).padStart(2, '0')}:${String(sec).padStart(2, '0')}`;
  return `${m}:${String(sec).padStart(2, '0')}`;
}

// Format duration from itunes:duration (could be seconds or HH:MM:SS)
function parseDuration(raw) {
  if (!raw) return '';
  if (raw.includes(':')) {
    const parts = raw.split(':').map(Number);
    let totalSec = 0;
    if (parts.length === 3) totalSec = parts[0] * 3600 + parts[1] * 60 + parts[2];
    else if (parts.length === 2) totalSec = parts[0] * 60 + parts[1];
    return `${Math.round(totalSec / 60)} min`;
  }
  const sec = parseInt(raw, 10);
  if (isNaN(sec)) return '';
  return `${Math.round(sec / 60)} min`;
}

// Format date nicely
function formatDate(dateStr) {
  const d = new Date(dateStr);
  return d.toLocaleDateString('en-US', { month: 'short', day: 'numeric', year: 'numeric' });
}

// Strip HTML tags and truncate
function truncate(html, maxLen) {
  const div = document.createElement('div');
  div.innerHTML = html || '';
  const text = div.textContent || '';
  if (text.length <= maxLen) return text;
  return text.slice(0, maxLen).trimEnd() + '...';
}

// SVG icons
const playSVG = '<svg viewBox="0 0 24 24"><path d="M8 5v14l11-7z"/></svg>';
const pauseSVG = '<svg viewBox="0 0 24 24"><path d="M6 19h4V5H6v14zm8-14v14h4V5h-4z"/></svg>';

// Fetch with timeout
function fetchWithTimeout(url, ms = 8000) {
  const controller = new AbortController();
  const timeout = setTimeout(() => controller.abort(), ms);
  return fetch(url, { signal: controller.signal }).finally(() => clearTimeout(timeout));
}

// Fetch and parse RSS feed
async function fetchEpisodes() {
  let xml;
  const maxRetries = 2;
  for (let attempt = 0; attempt <= maxRetries; attempt++) {
    try {
      const res = await fetchWithTimeout(FEED_URL);
      if (!res.ok) throw new Error('Fetch failed');
      xml = await res.text();
      if (xml.includes('<item>')) break;
      throw new Error('Invalid response');
    } catch (err) {
      if (attempt === maxRetries) {
        episodesList.innerHTML = '<div class="episodes-error">Unable to load episodes. <a href="https://podcast.macneilmediagroup.com/@LukeAtTheRoost/feed.xml" target="_blank">View RSS feed</a></div>';
        return;
      }
    }
  }

  const parser = new DOMParser();
  const doc = parser.parseFromString(xml, 'text/xml');
  const items = doc.querySelectorAll('item');

  if (items.length === 0) {
    episodesList.innerHTML = '<div class="episodes-error">No episodes found.</div>';
    return;
  }

  const episodes = Array.from(items).map((item, i) => {
    const title = item.querySelector('title')?.textContent || 'Untitled';
    const description = item.querySelector('description')?.textContent || '';
    const enclosure = item.querySelector('enclosure');
    const audioUrl = enclosure?.getAttribute('url') || '';
    const pubDate = item.querySelector('pubDate')?.textContent || '';
    const duration = item.getElementsByTagNameNS('http://www.itunes.com/dtds/podcast-1.0.dtd', 'duration')[0]?.textContent || '';
    const episodeNum = item.getElementsByTagNameNS('http://www.itunes.com/dtds/podcast-1.0.dtd', 'episode')[0]?.textContent || '';
    const link = item.querySelector('link')?.textContent || '';

    return { title, description, audioUrl, pubDate, duration, episodeNum, link };
  });

  renderEpisodes(episodes);
}

function renderEpisodes(episodes) {
  episodesList.innerHTML = '';

  episodes.forEach((ep) => {
    const card = document.createElement('div');
    card.className = 'episode-card';

    const epLabel = ep.episodeNum ? `Ep ${ep.episodeNum}` : '';
    const dateStr = ep.pubDate ? formatDate(ep.pubDate) : '';
    const durStr = parseDuration(ep.duration);

    const metaParts = [epLabel, dateStr, durStr].filter(Boolean).join(' &middot; ');

    card.innerHTML = `
      <button class="episode-play-btn" aria-label="Play ${ep.title}" data-url="${ep.audioUrl}" data-title="${ep.title.replace(/"/g, '&quot;')}">
        ${playSVG}
      </button>
      <div class="episode-info">
        <div class="episode-meta">${metaParts}</div>
        <div class="episode-title">${ep.title}</div>
        <div class="episode-desc">${truncate(ep.description, 150)}</div>
      </div>
    `;

    const btn = card.querySelector('.episode-play-btn');
    btn.addEventListener('click', () => playEpisode(ep.audioUrl, ep.title, card, btn));

    episodesList.appendChild(card);
  });
}

function playEpisode(url, title, card, btn) {
  if (!url) return;

  // If clicking the same episode that's playing, toggle play/pause
  if (audio.src === url || audio.src === encodeURI(url)) {
    if (audio.paused) {
      audio.play();
    } else {
      audio.pause();
    }
    return;
  }

  // Reset previous card button icon
  if (currentEpisodeCard) {
    const prevBtn = currentEpisodeCard.querySelector('.episode-play-btn');
    if (prevBtn) {
      prevBtn.innerHTML = playSVG;
      prevBtn.classList.remove('playing');
    }
  }

  currentEpisodeCard = card;
  audio.src = url;
  audio.play();

  playerTitle.textContent = title;
  stickyPlayer.classList.add('active');
}

// Sync UI with audio state
audio.addEventListener('play', () => {
  updatePlayIcons(true);
});

audio.addEventListener('pause', () => {
  updatePlayIcons(false);
});

audio.addEventListener('timeupdate', () => {
  if (audio.duration) {
    const pct = (audio.currentTime / audio.duration) * 100;
    playerProgressFill.style.width = pct + '%';
    playerTime.textContent = `${formatTime(audio.currentTime)} / ${formatTime(audio.duration)}`;
  }
});

audio.addEventListener('ended', () => {
  updatePlayIcons(false);
});

function updatePlayIcons(playing) {
  // Sticky player icons
  const iconPlay = playerPlayBtn.querySelector('.icon-play');
  const iconPause = playerPlayBtn.querySelector('.icon-pause');
  if (iconPlay) iconPlay.style.display = playing ? 'none' : 'block';
  if (iconPause) iconPause.style.display = playing ? 'block' : 'none';

  // Episode card icon
  if (currentEpisodeCard) {
    const btn = currentEpisodeCard.querySelector('.episode-play-btn');
    if (btn) {
      btn.innerHTML = playing ? pauseSVG : playSVG;
      btn.classList.toggle('playing', playing);
    }
  }
}

// Sticky player play/pause button
playerPlayBtn.addEventListener('click', () => {
  if (audio.src) {
    if (audio.paused) audio.play();
    else audio.pause();
  }
});

// Progress bar seeking
playerProgress.addEventListener('click', (e) => {
  if (audio.duration) {
    const rect = playerProgress.getBoundingClientRect();
    const pct = (e.clientX - rect.left) / rect.width;
    audio.currentTime = pct * audio.duration;
  }
});

// Init
fetchEpisodes();