const els = {
  serverUrl: document.querySelector('#server-url'),
  serverAddress: document.querySelector('#server-address'),
  loginInput: document.querySelector('#login-input'),
  usePassword: document.querySelector('#use-password'),
  passwordField: document.querySelector('#password-field'),
  passwordInput: document.querySelector('#password-input'),
  startBtn: document.querySelector('#start-btn'),
  pairingCard: document.querySelector('#pairing-card'),
  shortCode: document.querySelector('#short-code'),
  pairingHint: document.querySelector('#pairing-hint'),
  pairingExpire: document.querySelector('#pairing-expire'),
  cancelBtn: document.querySelector('#cancel-btn'),
  status: document.querySelector('#status'),
  sessionCard: document.querySelector('#session-card'),
  sessionLogin: document.querySelector('#session-login'),
  sessionId: document.querySelector('#session-id'),
  sessionType: document.querySelector('#session-type'),
  resumeBtn: document.querySelector('#resume-btn'),
  disconnectBtn: document.querySelector('#disconnect-btn'),
  connectionPill: document.querySelector('#connection-pill'),
};

let state = {
  settings: {
    serverLogin: 'shineupme',
    serverHttp: 'https://shineup.me',
    serverUrl: 'wss://shineup.me/ws',
    login: '',
  },
  pairing: {
    active: false,
    pairingId: '',
    expiresAtMs: 0,
  },
  session: null,
  connectionOnline: false,
  status: {
    text: '',
    kind: 'info',
  },
};

let refreshTimer = 0;
let saveSettingsTimer = 0;

function setStatus(message, kind = 'info') {
  els.status.textContent = String(message || '');
  els.status.className = `status ${kind === 'error' ? 'error' : 'info'}`;
  els.status.classList.toggle('hidden', !message);
}

function setConnectedPill(connected) {
  els.connectionPill.textContent = connected ? 'online' : 'offline';
  els.connectionPill.className = connected ? 'pill pill-online' : 'pill pill-offline';
}

function formatRemaining(ms) {
  const safe = Math.max(0, Math.floor(Number(ms || 0) / 1000));
  const minutes = Math.floor(safe / 60);
  const seconds = safe % 60;
  return `${minutes} мин ${seconds} сек`;
}

function applyState(nextState) {
  state = nextState || state;
  const serverValue = String(state?.settings?.serverLogin || 'shineupme');
  const serverAddressValue = String(state?.settings?.serverHttp || 'https://shineup.me');
  const loginValue = String(state?.settings?.login || '');
  if (document.activeElement !== els.serverUrl) {
    els.serverUrl.value = serverValue;
  }
  els.serverAddress.textContent = `Текущий адрес: ${serverAddressValue}`;
  if (document.activeElement !== els.loginInput) {
    els.loginInput.value = loginValue;
  }
  setConnectedPill(!!state?.connectionOnline);
  setStatus(state?.status?.text || '', state?.status?.kind || 'info');

  const session = state?.session;
  if (session) {
    els.sessionCard.classList.remove('hidden');
    els.sessionLogin.textContent = session.login || '—';
    els.sessionId.textContent = session.sessionId || '—';
    els.sessionType.textContent = String(session.sessionType || 50) === '50' ? 'wallet' : String(session.sessionType || '—');
  } else {
    els.sessionCard.classList.add('hidden');
    els.sessionLogin.textContent = '—';
    els.sessionId.textContent = '—';
    els.sessionType.textContent = 'wallet';
  }

  const pairing = state?.pairing || {};
  if (pairing.active) {
    els.pairingCard.classList.remove('hidden');
    const shortCode = String(pairing.shortCode || els.shortCode.dataset.shortCode || els.shortCode.textContent || '0000000');
    els.shortCode.dataset.shortCode = shortCode;
    els.shortCode.textContent = shortCode;
    els.pairingHint.textContent = pairing.trustedSessionOnline
      ? 'Покажите код на доверенном устройстве и подтвердите выпуск wallet-session.'
      : 'Сейчас нет онлайн доверенной сессии. Откройте другое устройство и подтвердите заявку.';
    const leftMs = Number(pairing.expiresAtMs || 0) - Date.now();
    els.pairingExpire.textContent = leftMs > 0 ? `Код действителен ещё ${formatRemaining(leftMs)}.` : 'Время ожидания истекло.';
    els.startBtn.disabled = true;
  } else {
    els.pairingCard.classList.add('hidden');
    els.shortCode.textContent = '0000000';
    delete els.shortCode.dataset.shortCode;
    els.pairingExpire.textContent = '';
    els.startBtn.disabled = false;
  }
}

function normalizeError(response, fallback) {
  return response?.error || fallback || 'Unknown error';
}

function sendMessage(type, payload = {}) {
  return new Promise((resolve, reject) => {
    chrome.runtime.sendMessage({ type, payload }, (response) => {
      if (chrome.runtime.lastError) {
        reject(new Error(chrome.runtime.lastError.message || 'Runtime message failed'));
        return;
      }
      if (!response?.ok) {
        reject(new Error(normalizeError(response, 'Wallet operation failed')));
        return;
      }
      if (response?.state) applyState(response.state);
      resolve(response);
    });
  });
}

async function refreshState() {
  const response = await sendMessage('wallet:getState');
  applyState(response.state);
}

async function saveSettings() {
  await sendMessage('wallet:saveSettings', {
    serverLogin: String(els.serverUrl.value || '').trim(),
    login: String(els.loginInput.value || '').trim(),
  });
}

function scheduleSaveSettings() {
  if (saveSettingsTimer) {
    window.clearTimeout(saveSettingsTimer);
  }
  saveSettingsTimer = window.setTimeout(() => {
    saveSettingsTimer = 0;
    void saveSettings();
  }, 250);
}

async function startPairing() {
  const login = String(els.loginInput.value || '').trim();
  if (!login) {
    setStatus('Введите логин.', 'error');
    return;
  }
  setStatus('Создаём wallet-session заявку...', 'info');
  els.startBtn.disabled = true;
  try {
    const response = await sendMessage('wallet:startPairing', {
      login,
      usePassword: !!els.usePassword.checked,
      password: String(els.passwordInput.value || ''),
      serverLogin: String(els.serverUrl.value || '').trim(),
    });
    applyState(response.state);
  } catch (error) {
    els.startBtn.disabled = false;
    setStatus(error.message || 'Не удалось начать pairing.', 'error');
  }
}

async function cancelPairing() {
  try {
    await sendMessage('wallet:cancelPairing');
  } catch (error) {
    setStatus(error.message || 'Не удалось отменить pairing.', 'error');
  }
}

async function resumeSession() {
  setStatus('Проверяем сохранённую wallet-session...', 'info');
  try {
    await sendMessage('wallet:resumeSession');
  } catch (error) {
    setStatus(error.message || 'Не удалось восстановить session.', 'error');
  }
}

async function disconnectSession() {
  try {
    await sendMessage('wallet:disconnectSession');
  } catch (error) {
    setStatus(error.message || 'Не удалось удалить session.', 'error');
  }
}

function startUiRefreshLoop() {
  stopUiRefreshLoop();
  refreshTimer = window.setInterval(() => {
    void refreshState();
  }, 1000);
}

function stopUiRefreshLoop() {
  if (refreshTimer) {
    window.clearInterval(refreshTimer);
    refreshTimer = 0;
  }
}

function bindUi() {
  els.usePassword.addEventListener('change', () => {
    els.passwordField.classList.toggle('hidden', !els.usePassword.checked);
    if (!els.usePassword.checked) {
      els.passwordInput.value = '';
    }
  });
  els.serverUrl.addEventListener('input', () => { scheduleSaveSettings(); });
  els.serverUrl.addEventListener('change', () => { void saveSettings(); });
  els.loginInput.addEventListener('input', () => { scheduleSaveSettings(); });
  els.loginInput.addEventListener('change', () => { void saveSettings(); });
  els.startBtn.addEventListener('click', () => { void startPairing(); });
  els.cancelBtn.addEventListener('click', () => { void cancelPairing(); });
  els.resumeBtn.addEventListener('click', () => { void resumeSession(); });
  els.disconnectBtn.addEventListener('click', () => { void disconnectSession(); });
}

async function init() {
  bindUi();
  await refreshState();
  startUiRefreshLoop();
}

window.addEventListener('beforeunload', () => {
  stopUiRefreshLoop();
  if (saveSettingsTimer) {
    window.clearTimeout(saveSettingsTimer);
    saveSettingsTimer = 0;
  }
});

void init();