// ─── DISPATCH Admin Script ────────────────────────────────────────────────────

const SESSION_KEY = 'dispatch_session_token';

// ─── State ────────────────────────────────────────────────────────────────────
let state = {
  sounds: [],
  notifications: [],
  devices: [],
};

let selectedNotifId = null;
let selectedDeviceUUID = null;
let nowIntervalId = null;
let pendingSoundFile = null;

let ws = null;
let reconnectTimer = null;
let authenticated = false;

// ─── UI Refs ──────────────────────────────────────────────────────────────────
const loginScreen  = document.getElementById('login-screen');
const appEl        = document.getElementById('app');
const loginBtn     = document.getElementById('login-btn');
const loginPwInput = document.getElementById('login-password');
const loginError   = document.getElementById('login-error');
const loginForm    = document.getElementById('login-form');
const loginConnecting = document.getElementById('login-connecting');

// ─── Auth Helpers ─────────────────────────────────────────────────────────────
function getToken() { return sessionStorage.getItem(SESSION_KEY); }
function setToken(t) { sessionStorage.setItem(SESSION_KEY, t); }
function clearToken() { sessionStorage.removeItem(SESSION_KEY); }

function showApp() {
  loginScreen.style.display = 'none';
  appEl.style.display = 'block';
  authenticated = true;
}

function showLogin(errorMsg) {
  appEl.style.display = 'none';
  loginScreen.style.display = 'flex';
  authenticated = false;
  loginForm.style.display = 'block';
  loginConnecting.style.display = 'none';
  loginPwInput.value = '';
  loginError.textContent = errorMsg || '';
}

function setLoginLoading(loading) {
  loginForm.style.display = loading ? 'none' : 'block';
  loginConnecting.style.display = loading ? 'flex' : 'none';
}

// ─── WebSocket ────────────────────────────────────────────────────────────────
function connect() {
  clearTimeout(reconnectTimer);
  const proto = location.protocol === 'https:' ? 'wss' : 'ws';
  ws = new WebSocket(`${proto}://${location.host}/admin-ws`);

  ws.addEventListener('open', () => {
    // Server will immediately send auth_required; we respond appropriately
  });

  ws.addEventListener('message', (e) => {
    let msg;
    try { msg = JSON.parse(e.data); } catch { return; }
    handleMessage(msg);
  });

  ws.addEventListener('close', () => {
    if (authenticated) {
      setIndicator(false);
      // Try to reconnect silently — session token is still in sessionStorage
      reconnectTimer = setTimeout(connect, 3000);
    }
  });

  ws.addEventListener('error', () => ws.close());
}

function send(msg) {
  if (ws && ws.readyState === WebSocket.OPEN) ws.send(JSON.stringify(msg));
}

// ─── Message Handling ─────────────────────────────────────────────────────────
function handleMessage(msg) {
  switch (msg.type) {

    case 'auth_required': {
      // Server is asking us to authenticate
      const token = getToken();
      if (token) {
        // Try to resume existing session
        setLoginLoading(true);
        send({ type: 'auth_resume', token });
      } else {
        // Show login form
        showLogin();
      }
      break;
    }

    case 'auth_ok': {
      setToken(msg.token);
      showApp();
      setIndicator(true);
      break;
    }

    case 'auth_error': {
      clearToken();
      showLogin(msg.reason || 'Authentication failed.');
      break;
    }

    case 'auth_timeout': {
      clearToken();
      showLogin('Connection timed out. Please try again.');
      break;
    }

    case 'full_state': {
      state.sounds = msg.sounds || [];
      state.notifications = msg.notifications || [];
      state.devices = msg.devices || [];
      renderAll();
      break;
    }

    case 'sound_added': {
      if (!state.sounds.find(s => s.id === msg.sound.id)) state.sounds.push(msg.sound);
      updateSoundSelect();
      break;
    }

    case 'notification_added': {
      if (!state.notifications.find(n => n.id === msg.notification.id))
        state.notifications.push(msg.notification);
      renderNotifList();
      updateNotifCount();
      toast('Notification created', 'success');
      break;
    }

    case 'devices_updated': {
      state.devices = msg.devices || [];
      renderDeviceList();
      updateDeviceCount();
      if (selectedDeviceUUID) {
        const d = state.devices.find(d => d.uuid === selectedDeviceUUID);
        if (d) renderDeviceDetail(d);
      }
      break;
    }

    case 'sound_data': {
      const existing = state.sounds.find(s => s.id === msg.sound.id);
      if (existing) { existing.data = msg.sound.data; }
      else { state.sounds.push(msg.sound); }
      break;
    }

    default: break;
  }
}

// ─── Login Form ───────────────────────────────────────────────────────────────
loginBtn.addEventListener('click', doLogin);
loginPwInput.addEventListener('keydown', (e) => { if (e.key === 'Enter') doLogin(); });

function doLogin() {
  const password = loginPwInput.value;
  if (!password) { loginError.textContent = 'Enter a password.'; return; }
  loginError.textContent = '';
  setLoginLoading(true);
  // If WS is not open yet, connect first then send on open
  if (!ws || ws.readyState !== WebSocket.OPEN) {
    connect();
    // wait for auth_required, then it will show login — but we want to auto-submit
    // Store the password to auto-submit after connection
    ws.addEventListener('open', () => {
      // auth_required will trigger from server, which will show login again
      // Instead, wait for auth_required then send login directly
    }, { once: true });
    // Override: on auth_required from a fresh connect after user clicked login,
    // send the login immediately
    const originalHandler = ws.onmessage;
    ws.addEventListener('message', function onFirstMsg(e) {
      let msg;
      try { msg = JSON.parse(e.data); } catch { return; }
      if (msg.type === 'auth_required') {
        ws.removeEventListener('message', onFirstMsg);
        send({ type: 'auth_login', password });
      }
    });
  } else {
    send({ type: 'auth_login', password });
  }
}

// ─── Logout ───────────────────────────────────────────────────────────────────
document.getElementById('logout-btn').addEventListener('click', () => {
  clearToken();
  authenticated = false;
  clearTimeout(reconnectTimer);
  if (ws) ws.close();
  showLogin();
});

// ─── Render All ───────────────────────────────────────────────────────────────
function renderAll() {
  updateSoundSelect();
  renderNotifList();
  updateNotifCount();
  renderDeviceList();
  updateDeviceCount();
  if (selectedNotifId) {
    const n = state.notifications.find(n => n.id === selectedNotifId);
    if (!n) selectedNotifId = null;
    else showSchedulePanel(n);
  }
}

// ─── Notifications ────────────────────────────────────────────────────────────
function renderNotifList() {
  const list = document.getElementById('notif-list');
  if (!state.notifications.length) {
    list.innerHTML = '<div class="empty-state">No notifications yet.</div>';
    return;
  }
  list.innerHTML = state.notifications.map(n => {
    const sound = n.soundId ? state.sounds.find(s => s.id === n.soundId) : null;
    const sel = n.id === selectedNotifId ? 'selected' : '';
    return `
      <div class="notif-item ${sel}" data-id="${n.id}">
        <div class="notif-item-name">${esc(n.name)}</div>
        <div class="notif-item-heading">${esc(n.heading)}</div>
        <div class="notif-item-body">${esc(n.body)}</div>
        ${sound ? `<span class="notif-item-sound">♪ ${esc(sound.name)}</span>` : ''}
      </div>`;
  }).join('');

  list.querySelectorAll('.notif-item').forEach(el => {
    el.addEventListener('click', () => {
      selectedNotifId = el.dataset.id;
      list.querySelectorAll('.notif-item').forEach(e => e.classList.remove('selected'));
      el.classList.add('selected');
      const notif = state.notifications.find(n => n.id === selectedNotifId);
      if (notif) showSchedulePanel(notif);
    });
  });
}

function updateNotifCount() {
  document.getElementById('notif-count').textContent = state.notifications.length;
}

function updateSoundSelect() {
  const sel = document.getElementById('f-sound');
  const current = sel.value;
  sel.innerHTML = '<option value="">— No Sound —</option>' +
    state.sounds.map(s => `<option value="${s.id}">${esc(s.name)}</option>`).join('');
  if (current) sel.value = current;
}

// ─── Schedule Panel ───────────────────────────────────────────────────────────
function showSchedulePanel(notif) {
  document.getElementById('schedule-empty-state').style.display = 'none';
  const active = document.getElementById('schedule-active');
  active.style.display = 'flex';
  active.style.flexDirection = 'column';
  document.getElementById('selected-notif-name').textContent = notif.heading || notif.name;
  setDateTimeToNow();
}

function setDateTimeToNow() {
  const now = new Date();
  document.getElementById('sched-date').value = now.toISOString().slice(0, 10);
  document.getElementById('sched-time').value = now.toTimeString().slice(0, 5);
}

// ─── Devices ──────────────────────────────────────────────────────────────────
function renderDeviceList() {
  const list = document.getElementById('device-list');
  if (!state.devices.length) {
    list.innerHTML = '<div class="empty-state">No devices yet.</div>';
    return;
  }
  list.innerHTML = state.devices.map(d => {
    const sel = d.uuid === selectedDeviceUUID ? 'selected' : '';
    const lastConn = d.lastConnection ? `Last seen ${timeSince(d.lastConnection)}` : 'Active now';
    return `
      <div class="device-item ${sel}" data-uuid="${d.uuid}">
        <span class="indicator ${d.online ? 'online' : 'offline'}"></span>
        <div class="device-item-info">
          <div class="device-item-name">${esc(d.name)}</div>
          <div class="device-item-uuid">${d.uuid.slice(0,18)}…</div>
          <div class="device-item-last">${lastConn}</div>
        </div>
      </div>`;
  }).join('');

  list.querySelectorAll('.device-item').forEach(el => {
    el.addEventListener('click', () => {
      selectedDeviceUUID = el.dataset.uuid;
      list.querySelectorAll('.device-item').forEach(e => e.classList.remove('selected'));
      el.classList.add('selected');
      const d = state.devices.find(d => d.uuid === selectedDeviceUUID);
      if (d) renderDeviceDetail(d);
    });
  });
}

function updateDeviceCount() {
  document.getElementById('device-count').textContent = state.devices.length;
}

function renderDeviceDetail(device) {
  document.getElementById('device-empty-state').style.display = 'none';
  const detail = document.getElementById('device-detail');
  detail.style.display = 'block';

  document.getElementById('detail-device-name-display').textContent = device.name;
  document.getElementById('detail-device-uuid').textContent = device.uuid;
  document.getElementById('device-name-input').value = device.name;
  document.getElementById('device-status-indicator').className = `indicator ${device.online ? 'online' : 'offline'}`;

  // Cached sounds
  const soundsEl = document.getElementById('detail-sounds');
  const cached = device.cachedSounds || [];
  soundsEl.innerHTML = !cached.length
    ? '<span style="color:var(--text-dimmer);font-size:12px">None cached</span>'
    : cached.map(sid => {
        const sound = state.sounds.find(s => s.id === sid);
        return `<span class="tag"><span class="tag-dot"></span>${esc(sound ? sound.name : sid.slice(0,8))}</span>`;
      }).join('');

  // Notifications table
  const notifsEl = document.getElementById('detail-notifications');
  const deviceNotifs = device.notifications || [];
  notifsEl.innerHTML = !deviceNotifs.length
    ? '<div class="empty-state" style="padding:20px 0">No notifications</div>'
    : `<table class="data-table"><thead><tr><th>NAME</th><th>HEADING</th><th>DISPLAYED</th></tr></thead><tbody>
        ${deviceNotifs.map(n => `<tr>
          <td>${esc(n.name)}</td><td>${esc(n.heading)}</td>
          <td style="color:${n.displayed ? 'var(--green)' : 'var(--text-dimmer)'}">${n.displayed ? '✓ YES' : '— NO'}</td>
        </tr>`).join('')}
      </tbody></table>`;

  // Schedule table
  const schedEl = document.getElementById('detail-schedule');
  const schedule = device.schedule || [];
  if (!schedule.length) {
    schedEl.innerHTML = '<div class="empty-state" style="padding:20px 0">No scheduled notifications</div>';
  } else {
    schedEl.innerHTML = `<table class="data-table"><thead><tr><th>NOTIFICATION</th><th>SCHEDULED FOR</th><th>ACTION</th></tr></thead><tbody>
      ${schedule.map(entry => {
        const notif = state.notifications.find(n => n.id === entry.notificationId);
        const name = notif ? (notif.heading || notif.name) : entry.notificationId.slice(0,8);
        return `<tr>
          <td>${esc(name)}</td>
          <td>${new Date(entry.scheduledAt).toLocaleString()}</td>
          <td><button class="action-btn" data-uuid="${device.uuid}" data-nid="${entry.notificationId}">REMOVE</button></td>
        </tr>`;
      }).join('')}
    </tbody></table>`;
    schedEl.querySelectorAll('.action-btn').forEach(btn => {
      btn.addEventListener('click', () => {
        send({ type: 'remove_schedule', uuid: btn.dataset.uuid, notificationId: btn.dataset.nid });
        toast('Schedule entry removed');
      });
    });
  }
}

// ─── Create Notification ──────────────────────────────────────────────────────
document.getElementById('create-notif-btn').addEventListener('click', () => {
  const name      = document.getElementById('f-name').value.trim();
  const heading   = document.getElementById('f-heading').value.trim();
  const body      = document.getElementById('f-body').value.trim();
  const hyperlink = document.getElementById('f-hyperlink').value.trim();
  const soundId   = document.getElementById('f-sound').value;

  if (!name || !heading) { toast('Name and Heading are required', 'error'); return; }

  if (pendingSoundFile) {
    const { soundName, data } = pendingSoundFile;
    if (!soundName) { toast('Enter a name for the sound', 'error'); return; }
    send({ type: 'create_sound', name: soundName, data });
    pendingSoundFile = null;
    document.getElementById('sound-file-name').textContent = 'No file chosen';
    document.getElementById('f-sound-name').value = '';
    toast('Sound uploaded — select it in the dropdown, then create the notification.', 'success');
    return;
  }

  send({ type: 'create_notification', name, heading, body, hyperlink, soundId: soundId || null });
  document.getElementById('f-name').value = '';
  document.getElementById('f-heading').value = '';
  document.getElementById('f-body').value = '';
  document.getElementById('f-hyperlink').value = '';
  document.getElementById('f-sound').value = '';
});

document.getElementById('sound-upload-btn').addEventListener('click', () => {
  document.getElementById('f-sound-file').click();
});

document.getElementById('f-sound-file').addEventListener('change', (e) => {
  const file = e.target.files[0];
  if (!file) return;
  document.getElementById('sound-file-name').textContent = file.name;
  const reader = new FileReader();
  reader.onload = (evt) => {
    const base64 = evt.target.result.split(',')[1];
    const soundName = document.getElementById('f-sound-name').value.trim() || file.name;
    pendingSoundFile = { soundName, data: base64 };
  };
  reader.readAsDataURL(file);
});

document.getElementById('f-sound-name').addEventListener('input', () => {
  if (pendingSoundFile) pendingSoundFile.soundName = document.getElementById('f-sound-name').value.trim();
});

// ─── Play Now ─────────────────────────────────────────────────────────────────
document.getElementById('play-now-btn').addEventListener('click', () => {
  if (!selectedNotifId) return;
  for (const device of state.devices) {
    send({ type: 'play_now', uuid: device.uuid, notificationId: selectedNotifId });
  }
  toast('▶ Sent to all devices', 'success');
});

// ─── Now Toggle ───────────────────────────────────────────────────────────────
document.getElementById('now-toggle').addEventListener('change', (e) => {
  if (e.target.checked) {
    setDateTimeToNow();
    nowIntervalId = setInterval(setDateTimeToNow, 1000);
    document.getElementById('datetime-pickers').style.opacity = '0.5';
    document.getElementById('datetime-pickers').style.pointerEvents = 'none';
  } else {
    clearInterval(nowIntervalId);
    document.getElementById('datetime-pickers').style.opacity = '';
    document.getElementById('datetime-pickers').style.pointerEvents = '';
  }
});

// ─── Schedule ─────────────────────────────────────────────────────────────────
document.getElementById('schedule-btn').addEventListener('click', () => {
  if (!selectedNotifId) return;
  const dateVal = document.getElementById('sched-date').value;
  const timeVal = document.getElementById('sched-time').value;
  if (!dateVal || !timeVal) { toast('Select a date and time', 'error'); return; }
  const scheduledAt = new Date(`${dateVal}T${timeVal}`).getTime();
  if (isNaN(scheduledAt)) { toast('Invalid date/time', 'error'); return; }
  const targets = selectedDeviceUUID
    ? state.devices.filter(d => d.uuid === selectedDeviceUUID)
    : state.devices;
  if (!targets.length) { toast('No devices to schedule on', 'error'); return; }
  for (const device of targets) {
    send({ type: 'schedule_notification', uuid: device.uuid, notificationId: selectedNotifId, scheduledAt });
  }
  toast(`Scheduled on ${targets.length} device(s)`, 'success');
});

// ─── Tabs ─────────────────────────────────────────────────────────────────────
document.querySelectorAll('.tab-btn').forEach(btn => {
  btn.addEventListener('click', () => {
    const tab = btn.dataset.tab;
    document.querySelectorAll('.tab-btn').forEach(b => b.classList.remove('active'));
    document.querySelectorAll('.tab-panel').forEach(p => p.classList.remove('active'));
    btn.classList.add('active');
    document.getElementById(`tab-${tab}`).classList.add('active');
  });
});

// ─── Device Name ─────────────────────────────────────────────────────────────
document.getElementById('device-name-save').addEventListener('click', () => {
  if (!selectedDeviceUUID) return;
  const name = document.getElementById('device-name-input').value.trim();
  if (!name) { toast('Enter a name', 'error'); return; }
  send({ type: 'update_device_name', uuid: selectedDeviceUUID, name });
  toast('Name updated', 'success');
});

// ─── WS Indicator ─────────────────────────────────────────────────────────────
function setIndicator(online) {
  const dot = document.getElementById('ws-indicator');
  const label = document.getElementById('ws-label');
  dot.className = `indicator ${online ? 'online' : 'offline'}`;
  label.textContent = online ? 'LIVE' : 'OFFLINE';
}

// ─── Toast ────────────────────────────────────────────────────────────────────
let toastTimer;
function toast(msg, type = '') {
  let el = document.getElementById('toast');
  if (!el) { el = document.createElement('div'); el.id = 'toast'; document.body.appendChild(el); }
  el.textContent = msg;
  el.className = type ? `show ${type}` : 'show';
  clearTimeout(toastTimer);
  toastTimer = setTimeout(() => { el.className = el.className.replace('show', '').trim(); }, 3000);
}

// ─── Helpers ──────────────────────────────────────────────────────────────────
function esc(str) {
  return String(str || '').replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;').replace(/"/g,'&quot;');
}
function timeSince(ts) {
  const d = Date.now() - ts;
  if (d < 60000) return `${Math.floor(d/1000)}s ago`;
  if (d < 3600000) return `${Math.floor(d/60000)}m ago`;
  if (d < 86400000) return `${Math.floor(d/3600000)}h ago`;
  return `${Math.floor(d/86400000)}d ago`;
}

// ─── Boot ─────────────────────────────────────────────────────────────────────
setDateTimeToNow();
connect();