/**
 * diora — radio player
 * Handles playback, SSE metadata, search, station management, and affiliate links.
 */

'use strict';

// ---------------------------------------------------------------------------
// State
// ---------------------------------------------------------------------------

let currentStation = null;   // { url, name, id } | null
let currentTrack = '';
let sseSource = null;
let isPlaying = false;
let currentPlayId = null;

const audio = new Audio();

// ---------------------------------------------------------------------------
// DOM helpers
// ---------------------------------------------------------------------------

function $(id) { return document.getElementById(id); }

function getCsrfToken() {
  const cookie = document.cookie.split('; ').find(r => r.startsWith('csrftoken='));
  return cookie ? cookie.split('=')[1] : '';
}

function formatDateTime(iso) {
  if (!iso) return '';
  const d = new Date(iso);
  const pad = n => String(n).padStart(2, '0');
  return `${d.getFullYear()}-${pad(d.getMonth()+1)}-${pad(d.getDate())} `
       + `${pad(d.getHours())}:${pad(d.getMinutes())}`;
}

function escapeHtml(str) {
  return String(str)
    .replace(/&/g, '&')
    .replace(/</g, '&lt;')
    .replace(/>/g, '&gt;')
    .replace(/"/g, '&quot;');
}

// ---------------------------------------------------------------------------
// Play / Stop
// ---------------------------------------------------------------------------

function playStation(url, name, stationId) {
  stopPlayback(false);

  currentStation = { url, name, id: stationId || null };
  isPlaying = true;

  audio.src = url;
  const volSlider = document.getElementById('volume');
  if (volSlider) audio.volume = volSlider.value / 100;
  audio.play().catch(() => {
    // Browser may block autoplay; the user needs to interact first
    console.warn('Audio play blocked by browser policy.');
  });

  $('now-playing-station').textContent = name;
  $('now-playing-track').textContent = '';
  $('play-stop-btn').style.display = '';
  $('play-stop-btn').textContent = '⏹ Stop';
  $('play-stop-btn').classList.add('playing');
  $('save-station-btn').style.display = '';

  startMetadataSSE(url);
  startPlaySession(name, url);
}

function stopPlayback(clearStation = true) {
  audio.pause();
  audio.src = '';
  isPlaying = false;

  if (sseSource) {
    sseSource.close();
    sseSource = null;
  }

  $('play-stop-btn').textContent = '▶ Play';
  $('play-stop-btn').classList.remove('playing');
  $('save-station-btn').style.display = 'none';
  $('affiliate-section').style.display = 'none';

  stopPlaySession();

  if (clearStation) {
    currentStation = null;
    currentTrack = '';
    $('now-playing-station').textContent = '— no station —';
    $('now-playing-track').textContent = '';
    $('play-stop-btn').style.display = 'none';
  }
}

function togglePlayStop() {
  if (isPlaying) {
    stopPlayback(true);
  } else if (currentStation) {
    playStation(currentStation.url, currentStation.name, currentStation.id);
  }
}

// ---------------------------------------------------------------------------
// Play session tracking
// ---------------------------------------------------------------------------

async function startPlaySession(stationName, stationUrl) {
  try {
    const res = await fetch('/radio/play/start/', {
      method: 'POST',
      headers: {'Content-Type': 'application/json', 'X-CSRFToken': getCsrfToken()},
      body: JSON.stringify({station_name: stationName, station_url: stationUrl})
    });
    if (res.ok) {
      const data = await res.json();
      currentPlayId = data.play_id;
    }
  } catch (e) {}
}

async function stopPlaySession() {
  if (!currentPlayId) return;
  try {
    await fetch('/radio/play/stop/', {
      method: 'POST',
      headers: {'Content-Type': 'application/json', 'X-CSRFToken': getCsrfToken()},
      body: JSON.stringify({play_id: currentPlayId})
    });
  } catch (e) {}
  currentPlayId = null;
}

window.addEventListener('beforeunload', () => {
  if (currentPlayId) {
    navigator.sendBeacon('/radio/play/stop/', JSON.stringify({play_id: currentPlayId}));
  }
});

// ---------------------------------------------------------------------------
// Recommendations
// ---------------------------------------------------------------------------

async function loadRecommendations() {
  const container = document.getElementById('recommendations');
  if (!container) return;
  try {
    const res = await fetch('/radio/recommendations/');
    const data = await res.json();
    if (!data.recommendations.length) {
      container.innerHTML = '<p class="muted">Play more stations to get recommendations.</p>';
      return;
    }
    const label = data.context;
    let html = `<p class="recommendations-context">Based on your ${label} listening:</p><ul class="recommendations-list">`;
    for (const r of data.recommendations) {
      html += `<li>
          <button class="btn btn-sm" onclick="playStation('${escapeAttr(r.station_url)}', '${escapeAttr(r.station_name)}', ${r.saved_id || 'null'})">
              &#9654; ${escapeHtml(r.station_name)}
          </button>
          <span class="muted">${r.play_count}&times;</span>
      </li>`;
    }
    html += '</ul>';
    container.innerHTML = html;
  } catch (e) {}
}

function escapeAttr(s) {
  return String(s).replace(/'/g, "\\'").replace(/"/g, '&quot;');
}

// ---------------------------------------------------------------------------
// Volume
// ---------------------------------------------------------------------------

document.getElementById('volume').addEventListener('input', function () {
  audio.volume = this.value / 100;
  localStorage.setItem('diora_volume', this.value);
});

// ---------------------------------------------------------------------------
// SSE metadata
// ---------------------------------------------------------------------------

function startMetadataSSE(streamUrl) {
  if (sseSource) { sseSource.close(); sseSource = null; }

  const endpoint = '/radio/sse/?url=' + encodeURIComponent(streamUrl);
  sseSource = new EventSource(endpoint);

  sseSource.onmessage = function (e) {
    let data;
    try { data = JSON.parse(e.data); } catch (_) { return; }

    if (data.error) {
      console.warn('SSE stream ended:', data.error);
      return;
    }

    if (data.track && data.track !== currentTrack) {
      currentTrack = data.track;
      updateNowPlayingUI(data.track);
      recordTrack(currentStation ? currentStation.name : '', data.track);
      fetchAffiliateLinks(data.track);
    }
  };

  sseSource.onerror = function () {
    // Connection dropped; the browser will attempt to reconnect automatically
    console.warn('SSE connection error, browser will retry.');
  };
}

function updateNowPlayingUI(track) {
  $('now-playing-track').textContent = track;
}

// ---------------------------------------------------------------------------
// Record track
// ---------------------------------------------------------------------------

async function recordTrack(stationName, track) {
  try {
    const res = await fetch('/radio/record/', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'X-CSRFToken': getCsrfToken(),
      },
      body: JSON.stringify({ station_name: stationName, track, scrobble: true }),
    });
    if (res.ok) {
      addHistoryRow(stationName, track);
    }
  } catch (err) {
    console.error('recordTrack error:', err);
  }
}

function addHistoryRow(stationName, track) {
  const tbody = $('history-tbody');
  if (!tbody) return;

  // Remove the "no history" placeholder row if present
  const emptyRow = $('history-empty-row');
  if (emptyRow) emptyRow.remove();

  const tr = document.createElement('tr');
  const now = new Date().toISOString();
  tr.innerHTML = `
    <td class="history-time">${escapeHtml(formatDateTime(now))}</td>
    <td>${escapeHtml(stationName)}</td>
    <td>${escapeHtml(track)}</td>
    <td></td>
    <td><button class="btn-delete-history" onclick="deleteHistoryEntry(null, this)" title="Remove">✕</button></td>
  `;
  tbody.insertBefore(tr, tbody.firstChild);
}

async function deleteHistoryEntry(id, btn) {
  const tr = btn.closest('tr');
  if (!id) { tr.remove(); return; }
  try {
    const res = await fetch(`/radio/history/${id}/delete/`, {
      method: 'POST',
      headers: {'X-CSRFToken': getCsrfToken()},
    });
    if (res.ok) tr.remove();
  } catch (e) {}
}

// ---------------------------------------------------------------------------
// Affiliate links
// ---------------------------------------------------------------------------

async function fetchAffiliateLinks(track) {
  const section = $('affiliate-section');
  try {
    const res = await fetch('/radio/affiliate/?track=' + encodeURIComponent(track));
    if (!res.ok) return;
    const data = await res.json();

    const itunes = data.itunes_data || {};

    $('affiliate-track-name').textContent = itunes.name || track;
    $('affiliate-artist-name').textContent = itunes.artist || '';
    $('affiliate-album-name').textContent = itunes.album || '';

    const artEl = $('affiliate-artwork');
    if (itunes.artwork) {
      artEl.src = itunes.artwork;
      artEl.style.display = '';
    } else {
      artEl.style.display = 'none';
    }

    const amzLink = $('affiliate-amazon-link');
    if (data.amazon_url) {
      amzLink.href = data.amazon_url;
      amzLink.style.display = '';
    } else {
      amzLink.style.display = 'none';
    }

    section.style.display = 'flex';
  } catch (err) {
    console.error('fetchAffiliateLinks error:', err);
    section.style.display = 'none';
  }
}

// ---------------------------------------------------------------------------
// Search (radio-browser.info)
// ---------------------------------------------------------------------------

async function doSearch() {
  const query = $('search-input').value.trim();
  if (!query) return;

  const statusEl = $('search-status');
  const tableEl = $('search-results-table');
  const tbody = $('search-results-body');

  statusEl.textContent = 'Searching…';
  tableEl.style.display = 'none';
  tbody.innerHTML = '';

  try {
    const url = `https://de1.api.radio-browser.info/json/stations/search?name=${encodeURIComponent(query)}&limit=50&hidebroken=true&order=clickcount&reverse=true`;
    const res = await fetch(url);
    if (!res.ok) throw new Error(`HTTP ${res.status}`);
    const stations = await res.json();

    if (!stations.length) {
      statusEl.textContent = 'No stations found.';
      return;
    }

    statusEl.textContent = `${stations.length} result(s)`;
    tableEl.style.display = '';
    const curated = document.getElementById('curated-lists');
    if (curated) curated.style.display = 'none';

    stations.forEach(st => {
      const tr = document.createElement('tr');
      const safeName = escapeHtml(st.name || '');
      const safeUrl  = escapeHtml(st.url_resolved || st.url || '');
      const safeBr   = escapeHtml(st.bitrate ? st.bitrate + ' kbps' : '');
      const safeCC   = escapeHtml(st.countrycode || st.country || '');
      const safeTags = escapeHtml((st.tags || '').split(',').slice(0, 3).join(', '));

      tr.innerHTML = `
        <td title="${safeName}">${safeName}</td>
        <td>${safeBr}</td>
        <td>${safeCC}</td>
        <td title="${escapeHtml(st.tags || '')}">${safeTags}</td>
        <td>
          <button class="btn btn-sm btn-play"
                  onclick='searchPlay(${JSON.stringify(safeUrl)}, ${JSON.stringify(safeName)}, ${JSON.stringify({
                    name: st.name,
                    url: st.url_resolved || st.url,
                    bitrate: st.bitrate ? String(st.bitrate) : '',
                    country: st.country || '',
                    tags: st.tags || '',
                    favicon_url: st.favicon || '',
                  })})'>
            &#9654; Play
          </button>
        </td>
      `;
      tbody.appendChild(tr);
    });
  } catch (err) {
    statusEl.textContent = 'Search failed: ' + err.message;
  }
}

function searchPlay(url, name, stationData) {
  // Store station data on the window so saveCurrentStation() can use it
  window._pendingStationData = stationData;
  playStation(url, name, null);
}

// ---------------------------------------------------------------------------
// Save current station
// ---------------------------------------------------------------------------

async function saveCurrentStation() {
  if (!currentStation) return;

  // Use the rich data from search results if available, otherwise minimal data
  const data = window._pendingStationData || {
    name: currentStation.name,
    url: currentStation.url,
    bitrate: '',
    country: '',
    tags: '',
    favicon_url: '',
  };

  await saveStation(data);
}

async function saveStation(station) {
  try {
    const res = await fetch('/radio/save/', {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
        'X-CSRFToken': getCsrfToken(),
      },
      body: JSON.stringify(station),
    });

    if (res.status === 401) {
      alert('Please log in to save stations.');
      return;
    }

    const data = await res.json();
    if (data.ok) {
      if (data.created) {
        addSavedRow({ id: data.id, ...station, is_favorite: false });
      }
    }
  } catch (err) {
    console.error('saveStation error:', err);
  }
}

function addSavedRow(station) {
  const tbody = $('saved-tbody');
  if (!tbody) return;

  const emptyRow = $('saved-empty-row');
  if (emptyRow) emptyRow.remove();

  // Check for duplicate
  if (document.getElementById(`saved-row-${station.id}`)) return;

  const tr = document.createElement('tr');
  tr.id = `saved-row-${station.id}`;
  tr.dataset.id = station.id;
  tr.dataset.url = station.url;
  tr.dataset.name = station.name;

  const safeName = escapeHtml(station.name || '');
  const safeBr   = escapeHtml(station.bitrate || '');
  const safeCC   = escapeHtml(station.country || '');
  const safeUrl  = escapeHtml(station.url || '');

  tr.innerHTML = `
    <td>
      <button class="btn-icon fav-btn${station.is_favorite ? ' active' : ''}"
              onclick="toggleFav(${station.id}, this)"
              title="Toggle favorite">&#9733;</button>
    </td>
    <td class="station-name-cell">${safeName}</td>
    <td>${safeBr}</td>
    <td>${safeCC}</td>
    <td class="notes-cell" onclick="editNotes(${station.id}, this.textContent.trim())" title="" style="cursor:pointer; color:#666; max-width:120px; overflow:hidden; text-overflow:ellipsis; white-space:nowrap;"></td>
    <td>
      <button class="btn btn-sm"
              onclick="playStation('${safeUrl}', '${safeName}', ${station.id})">
        &#9654; Play
      </button>
    </td>
    <td>
      <button class="btn btn-sm btn-danger"
              onclick="removeStation(${station.id})">
        Remove
      </button>
    </td>
  `;
  tbody.appendChild(tr);
}

// ---------------------------------------------------------------------------
// Remove station
// ---------------------------------------------------------------------------

async function toggleFav(pk) {
  try {
    const res = await fetch(`/radio/favorite/${pk}/`, {
      method: 'POST',
      headers: { 'X-CSRFToken': getCsrfToken() },
    });
    if (!res.ok) return;
    const data = await res.json();

    // Flip the star button state
    const btn = document.querySelector(`#saved-row-${pk} .fav-btn`);
    if (btn) btn.classList.toggle('active', data.is_favorite);

    // Re-sort rows in the DOM: favorites first, then alphabetically
    const tbody = $('saved-tbody');
    if (!tbody) return;
    const rows = Array.from(tbody.querySelectorAll('tr[data-id]'));
    rows.sort((a, b) => {
      const aFav = a.querySelector('.fav-btn')?.classList.contains('active') ? 0 : 1;
      const bFav = b.querySelector('.fav-btn')?.classList.contains('active') ? 0 : 1;
      if (aFav !== bFav) return aFav - bFav;
      return a.dataset.name.localeCompare(b.dataset.name);
    });
    rows.forEach(row => tbody.appendChild(row));
  } catch (err) {
    console.error('toggleFav error', err);
  }
}

async function removeStation(pk) {
  try {
    const res = await fetch(`/radio/remove/${pk}/`, {
      method: 'POST',
      headers: { 'X-CSRFToken': getCsrfToken() },
    });
    if (res.ok) {
      const row = $(`saved-row-${pk}`);
      if (row) row.remove();

      const tbody = $('saved-tbody');
      if (tbody && tbody.querySelectorAll('tr').length === 0) {
        const tr = document.createElement('tr');
        tr.id = 'saved-empty-row';
        tr.innerHTML = '<td colspan="7" class="empty-msg">No saved stations yet.</td>';
        tbody.appendChild(tr);
      }
    }
  } catch (err) {
    console.error('removeStation error:', err);
  }
}

// ---------------------------------------------------------------------------
// Toggle favorite
// ---------------------------------------------------------------------------

async function toggleFav(pk, btnEl) {
  try {
    const res = await fetch(`/radio/favorite/${pk}/`, {
      method: 'POST',
      headers: { 'X-CSRFToken': getCsrfToken() },
    });
    if (res.ok) {
      const data = await res.json();
      if (data.is_favorite) {
        btnEl.classList.add('active');
      } else {
        btnEl.classList.remove('active');
      }
    }
  } catch (err) {
    console.error('toggleFav error:', err);
  }
}

// ---------------------------------------------------------------------------
// Focus Timer
// ---------------------------------------------------------------------------

const TIMER_WORK = 25 * 60;
const TIMER_BREAK = 5 * 60;
let timerSeconds = TIMER_WORK;
let timerRunning = false;
let timerIsBreak = false;
let timerInterval = null;

function timerTick() {
  timerSeconds--;
  renderTimer();
  if (timerSeconds <= 0) {
    clearInterval(timerInterval);
    timerInterval = null;
    timerRunning = false;
    if (!timerIsBreak) {
      // work session ended → start break
      timerIsBreak = true;
      recordFocusSession();
      timerSeconds = TIMER_BREAK;
      showTimerNotification('Break time! 5 minutes.');
      // auto-pause playback during break
      if (audio.src && !audio.paused) audio.pause();
    } else {
      // break ended → reset to work
      timerIsBreak = false;
      timerSeconds = TIMER_WORK;
      showTimerNotification('Break over. Back to work.');
    }
    renderTimer();
  }
}

function toggleTimer() {
  if (timerRunning) {
    clearInterval(timerInterval);
    timerInterval = null;
    timerRunning = false;
  } else {
    if ('Notification' in window && Notification.permission === 'default') {
      Notification.requestPermission();
    }
    timerRunning = true;
    timerInterval = setInterval(timerTick, 1000);
  }
  renderTimer();
}

function resetTimer() {
  clearInterval(timerInterval);
  timerInterval = null;
  timerRunning = false;
  timerIsBreak = false;
  timerSeconds = TIMER_WORK;
  renderTimer();
}

function renderTimer() {
  const m = String(Math.floor(timerSeconds / 60)).padStart(2, '0');
  const s = String(timerSeconds % 60).padStart(2, '0');
  const display = $('timer-display');
  const btn = $('timer-toggle-btn');
  const label = $('timer-phase-label');
  if (display) display.textContent = `${m}:${s}`;
  if (btn) btn.textContent = timerRunning ? '⏸' : '▶';
  if (label) label.textContent = timerIsBreak ? 'break' : 'focus';
  // colour the display red when break
  if (display) display.style.color = timerIsBreak ? '#e63946' : '';
}

function showTimerNotification(msg) {
  if ('Notification' in window && Notification.permission === 'granted') {
    new Notification('diora', { body: msg });
  }
  // also flash in the timer label
  const label = $('timer-phase-label');
  if (label) { label.textContent = msg; setTimeout(() => renderTimer(), 3000); }
}

// ---------------------------------------------------------------------------
// Focus session recording
// ---------------------------------------------------------------------------

async function recordFocusSession() {
  try {
    await fetch('/radio/focus/record/', {
      method: 'POST',
      headers: { 'Content-Type': 'application/json', 'X-CSRFToken': getCsrfToken() },
      body: JSON.stringify({
        station_name: currentStation ? currentStation.name : '',
        duration_minutes: 25,
      }),
    });
    loadFocusStats();
  } catch (e) {}
}

async function loadFocusStats() {
  try {
    const res = await fetch('/radio/focus/stats/');
    const data = await res.json();
    const widget = document.getElementById('focus-today-widget');
    if (widget) {
      if (data.today_sessions > 0) {
        widget.textContent = `Today: ${data.today_sessions} session${data.today_sessions !== 1 ? 's' : ''} · ${data.today_minutes} min`;
        widget.style.display = '';
      } else {
        widget.style.display = 'none';
      }
    }
    // populate focus tab
    const tbody = document.getElementById('focus-tbody');
    if (!tbody) return;
    tbody.innerHTML = '';
    if (!data.sessions.length) {
      tbody.innerHTML = '<tr><td colspan="3" class="empty-msg">No focus sessions yet. Start the timer!</td></tr>';
      return;
    }
    data.sessions.forEach(s => {
      const tr = document.createElement('tr');
      const dt = new Date(s.completed_at).toLocaleString([], {dateStyle: 'short', timeStyle: 'short'});
      tr.innerHTML = `<td>${dt}</td><td>${escapeHtml(s.station_name || '—')}</td><td>${s.duration_minutes} min</td>`;
      tbody.appendChild(tr);
    });
  } catch (e) {}
}

// ---------------------------------------------------------------------------
// Do Not Disturb / focus mode
// ---------------------------------------------------------------------------

let dndActive = false;

function toggleDNDLight() {
  document.body.classList.toggle('dnd-dark');
  const btn = $('dnd-light-btn');
  if (btn) btn.style.opacity = document.body.classList.contains('dnd-dark') ? '0.4' : '1';
}

function toggleDND() {
  dndActive = !dndActive;
  if (!dndActive) document.body.classList.remove('dnd-dark');
  document.body.classList.toggle('dnd-mode', dndActive);
  const btn = $('dnd-btn');
  if (btn) btn.classList.toggle('active', dndActive);
  if (dndActive) {
    const el = document.documentElement;
    if (el.requestFullscreen) el.requestFullscreen();
    else if (el.webkitRequestFullscreen) el.webkitRequestFullscreen();
  } else {
    if (document.fullscreenElement && document.exitFullscreen) document.exitFullscreen();
    else if (document.webkitFullscreenElement && document.webkitExitFullscreen) document.webkitExitFullscreen();
  }
}

// Exit DND on Escape (browser also exits fullscreen on Escape, so sync state)
document.addEventListener('fullscreenchange', () => {
  if (!document.fullscreenElement && dndActive) {
    dndActive = false;
    document.body.classList.remove('dnd-mode');
    const btn = $('dnd-btn');
    if (btn) btn.classList.remove('active');
  }
});

document.addEventListener('keydown', e => {
  if (e.key === 'Escape' && dndActive) toggleDND();
});

// ---------------------------------------------------------------------------
// Mood / genre tag filter
// ---------------------------------------------------------------------------

const MOOD_TAGS = [
  { label: '🎯 Focus', tag: 'ambient' },
  { label: '☕ Lo-fi', tag: 'lofi' },
  { label: '🎷 Jazz', tag: 'jazz' },
  { label: '🎻 Classical', tag: 'classical' },
  { label: '🌧 Ambient', tag: 'ambient drone' },
  { label: '🤘 Metal', tag: 'metal' },
  { label: '🎉 Electronic', tag: 'electronic' },
  { label: '📻 Talk', tag: 'talk' },
];

function initMoodChips() {
  const container = $('mood-chips');
  if (!container) return;
  MOOD_TAGS.forEach(({ label, tag }) => {
    const btn = document.createElement('button');
    btn.className = 'mood-chip';
    btn.textContent = label;
    btn.onclick = () => {
      const input = $('search-input');
      if (input) input.value = tag;
      doSearch();
    };
    container.appendChild(btn);
  });
}

// ---------------------------------------------------------------------------
// Curated station lists
// ---------------------------------------------------------------------------

const CURATED_LISTS = [
  {
    id: 'focus',
    label: '🎯 Focus',
    stations: [
      { name: 'SomaFM Drone Zone', url: 'https://ice6.somafm.com/dronezone-256-mp3' },
      { name: 'SomaFM Groove Salad', url: 'https://ice5.somafm.com/groovesalad-128-aac' },
      { name: 'Nightride FM', url: 'https://stream.nightride.fm/nightride.mp3' },
      { name: 'Nightride FM Chillsynth', url: 'https://stream.nightride.fm/chillsynth.mp3' },
    ],
  },
  {
    id: 'lofi',
    label: '☕ Lo-fi / Chill',
    stations: [
      { name: 'SomaFM Groove Salad Classic', url: 'https://ice6.somafm.com/gsclassic-128-mp3' },
      { name: 'SomaFM Secret Agent', url: 'https://ice4.somafm.com/secretagent-128-mp3' },
      { name: 'dublab DE', url: 'https://dublabde.out.airtime.pro/dublabde_a' },
    ],
  },
  {
    id: 'dark',
    label: '🌑 Dark / Industrial',
    stations: [
      { name: 'SomaFM Doomed', url: 'https://ice2.somafm.com/doomed-256-mp3' },
      { name: 'Nightride FM Darksynth', url: 'https://stream.nightride.fm/darksynth.mp3' },
      { name: 'Radio Caprice Industrial', url: 'http://79.120.39.202:9095/' },
    ],
  },
  {
    id: 'classical',
    label: '🎻 Classical',
    stations: [
      { name: 'BR Klassik', url: 'https://dispatcher.rndfnk.com/br/brklassik/live/mp3/high' },
      { name: 'SWR Kultur', url: 'https://f111.rndfnk.com/ard/swr/swr2/live/mp3/256/stream.mp3?aggregator=web' },
      { name: 'Deutschlandfunk Kultur', url: 'https://st02.sslstream.dlf.de/dlf/02/high/aac/stream.aac?aggregator=web' },
    ],
  },
];

function initCuratedLists() {
  const container = document.getElementById('curated-lists');
  if (!container) return;
  CURATED_LISTS.forEach(list => {
    const section = document.createElement('div');
    section.className = 'curated-section';
    section.innerHTML = `<div class="curated-label">${list.label}</div>`;
    const ul = document.createElement('ul');
    ul.className = 'curated-stations';
    list.stations.forEach(s => {
      const li = document.createElement('li');
      li.innerHTML = `<button class="btn btn-sm" onclick="playStation('${escapeAttr(s.url)}', '${escapeAttr(s.name)}', null)">▶</button>
                      <span class="curated-name">${escapeHtml(s.name)}</span>`;
      ul.appendChild(li);
    });
    section.appendChild(ul);
    container.appendChild(section);
  });
}

// ---------------------------------------------------------------------------
// Station notes
// ---------------------------------------------------------------------------

function editNotes(pk, current) {
  const note = prompt('Station note:', current || '');
  if (note === null) return; // cancelled
  fetch(`/radio/notes/${pk}/`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json', 'X-CSRFToken': getCsrfToken() },
    body: JSON.stringify({ notes: note }),
  }).then(r => {
    if (r.ok) {
      const cell = document.querySelector(`#saved-row-${pk} .notes-cell`);
      if (cell) cell.textContent = note;
    }
  });
}

// ---------------------------------------------------------------------------
// Tabs
// ---------------------------------------------------------------------------

function showTab(name) {
  const panels = ['search', 'saved', 'history', 'focus'];
  panels.forEach(p => {
    const panel = $(`tab-${p}`);
    if (panel) panel.style.display = (p === name) ? '' : 'none';
  });

  document.querySelectorAll('.tab-btn').forEach((btn, i) => {
    btn.classList.toggle('active', panels[i] === name);
  });

  if (name === 'saved') {
    loadRecommendations();
  }
}

// ---------------------------------------------------------------------------
// Service Worker
// ---------------------------------------------------------------------------

if ('serviceWorker' in navigator) {
  window.addEventListener('load', () => {
    navigator.serviceWorker.register('/static/js/sw.js').catch(err => {
      console.warn('Service worker registration failed:', err);
    });
  });
}

// ---------------------------------------------------------------------------
// M3U import
// ---------------------------------------------------------------------------

async function importM3U(input) {
  const file = input.files[0];
  if (!file) return;
  const status = document.getElementById('import-status');
  status.textContent = 'Importing…';

  const form = new FormData();
  form.append('file', file);
  form.append('csrfmiddlewaretoken', getCsrfToken());

  try {
    const res = await fetch('/radio/import/', { method: 'POST', body: form });
    const data = await res.json();
    if (data.ok) {
      status.textContent = `✓ ${data.added} added, ${data.skipped} already saved`;
      if (data.added > 0) location.reload();
    } else {
      status.textContent = `Error: ${data.error}`;
    }
  } catch (e) {
    status.textContent = 'Upload failed';
  }
  input.value = '';
}

// ---------------------------------------------------------------------------
// Contrast scheme
// ---------------------------------------------------------------------------

// Accent palette — ordered by preference. Algorithm picks the one with the
// highest WCAG contrast ratio against the detected background luminance.
const ACCENT_PALETTE = [
  { base: '#e63946', hover: '#ff4d58' }, // red
  { base: '#ff9500', hover: '#ffaa33' }, // orange
  { base: '#f1c40f', hover: '#f9d439' }, // yellow
  { base: '#2ecc71', hover: '#4ee88a' }, // green
  { base: '#00b4d8', hover: '#33c7e5' }, // cyan
  { base: '#4361ee', hover: '#6d84f4' }, // blue
  { base: '#c77dff', hover: '#d89fff' }, // purple
  { base: '#ff6b9d', hover: '#ff8fb5' }, // pink
  { base: '#ffffff', hover: '#cccccc' }, // white (last resort)
];

function _linearise(c) {
  c /= 255;
  return c <= 0.03928 ? c / 12.92 : Math.pow((c + 0.055) / 1.055, 2.4);
}
function _luminance(r, g, b) {
  return 0.2126 * _linearise(r) + 0.7152 * _linearise(g) + 0.0722 * _linearise(b);
}
function _contrast(l1, l2) {
  return (Math.max(l1, l2) + 0.05) / (Math.min(l1, l2) + 0.05);
}
function _hexRgb(hex) {
  return [parseInt(hex.slice(1,3),16), parseInt(hex.slice(3,5),16), parseInt(hex.slice(5,7),16)];
}

function analyzeBackground(url) {
  return new Promise(resolve => {
    const img = new Image();
    img.crossOrigin = 'anonymous';
    img.onload = () => {
      const canvas = document.createElement('canvas');
      canvas.width = 64; canvas.height = 64;
      const ctx = canvas.getContext('2d');
      ctx.drawImage(img, 0, 0, 64, 64);
      const data = ctx.getImageData(0, 0, 64, 64).data;
      let tR = 0, tG = 0, tB = 0, tBt601 = 0;
      const n = data.length / 4;
      for (let i = 0; i < data.length; i += 4) {
        tR += data[i]; tG += data[i+1]; tB += data[i+2];
        tBt601 += 0.299*data[i] + 0.587*data[i+1] + 0.114*data[i+2];
      }
      resolve({
        bright: (tBt601 / n) > 127,
        bgLuminance: _luminance(tR/n, tG/n, tB/n),
      });
    };
    img.onerror = () => resolve({ bright: false, bgLuminance: 0 });
    img.src = url;
  });
}

function pickBestAccent(bgLuminance) {
  let best = ACCENT_PALETTE[0], bestRatio = 0;
  for (const entry of ACCENT_PALETTE) {
    const [r, g, b] = _hexRgb(entry.base);
    const ratio = _contrast(bgLuminance, _luminance(r, g, b));
    if (ratio > bestRatio) { bestRatio = ratio; best = entry; }
  }
  return best;
}

function applyAccent(entry) {
  const root = document.documentElement;
  root.style.setProperty('--accent', entry.base);
  root.style.setProperty('--accent-hover', entry.hover);
}

function setScheme(bright) {
  document.body.classList.toggle('bright-bg', bright);
  const btn = document.getElementById('contrast-toggle');
  if (btn) btn.style.opacity = bright ? '1' : '0.5';
}

function toggleContrast() {
  setScheme(!document.body.classList.contains('bright-bg'));
}

// ---------------------------------------------------------------------------
// Init
// ---------------------------------------------------------------------------

(function init() {
  // Populate saved stations from server-side context if available
  if (typeof INITIAL_SAVED !== 'undefined' && Array.isArray(INITIAL_SAVED)) {
    // The server already renders saved stations in the template; nothing extra needed.
    // But if JS-rendered saved tab were needed we'd call addSavedRow here.
  }

  // Restore persisted volume, fall back to slider default
  const volSlider = $('volume');
  if (volSlider) {
    const saved = localStorage.getItem('diora_volume');
    const vol = saved !== null ? parseInt(saved, 10) : parseInt(volSlider.value, 10);
    volSlider.value = vol;
    audio.volume = vol / 100;
  }

  // Load recommendations on page load
  loadRecommendations();

  // Initialise focus timer display
  renderTimer();

  // Initialise mood/genre chips
  initMoodChips();

  // Initialise curated station lists
  initCuratedLists();

  // Show curated lists again when search input is cleared
  const searchInput = document.getElementById('search-input');
  if (searchInput) {
    searchInput.addEventListener('input', function () {
      if (this.value === '') {
        const curated = document.getElementById('curated-lists');
        if (curated) curated.style.display = '';
      }
    });
  }

  // Load focus session stats
  loadFocusStats();

  // Auto-detect wallpaper brightness + best accent colour
  const bgUrl = document.body.dataset.bg;
  if (bgUrl) {
    analyzeBackground(bgUrl).then(({ bright, bgLuminance }) => {
      setScheme(bright);
      applyAccent(pickBestAccent(bgLuminance));
    });
  }
})();