'use strict';

// ---------------------------------------------------------------------------
// 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('Pause! 5 Minuten.');
      // auto-pause playback during break
      if (audio.src && !audio.paused) audio.pause();
    } else {
      // break ended → reset to work
      timerIsBreak = false;
      timerSeconds = TIMER_WORK;
      showTimerNotification('Pause vorbei. Weiter geht’s.');
    }
    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 ? 'Pause' : 'Fokus';
  // 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 = `Heute: ${data.today_sessions} ${data.today_sessions !== 1 ? 'Sitzungen' : 'Sitzung'} · ${data.today_minutes} min`;
        widget.style.display = '';
      } else {
        widget.style.display = 'none';
      }
    }
    // populate focus tab
    const tbody = document.getElementById('focus-tbody');
    if (!tbody) return;
    tbody.innerHTML = '';
    if (!data.sessions.length) {
      tbody.innerHTML = '<tr><td colspan="3" class="empty-msg">Noch keine Fokus-Sitzungen. Starte den Timer!</td></tr>';
      return;
    }
    data.sessions.forEach(s => {
      const tr = document.createElement('tr');
      const dt = new Date(s.completed_at).toLocaleString([], {dateStyle: 'short', timeStyle: 'short'});
      tr.innerHTML = `<td>${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();
});