'use strict';

const DEFAULTS = { backendUrl: 'http://localhost:3000', apiToken: '', folderName: '' };

const els = {
  settings: document.getElementById('settings'),
  toggleSettings: document.getElementById('toggleSettings'),
  backendUrl: document.getElementById('backendUrl'),
  apiToken: document.getElementById('apiToken'),
  folderName: document.getElementById('folderName'),
  testBtn: document.getElementById('testBtn'),
  saveSettings: document.getElementById('saveSettings'),
  tabCount: document.getElementById('tabCount'),
  saveAll: document.getElementById('saveAll'),
  saveClose: document.getElementById('saveClose'),
  openBackend: document.getElementById('openBackend'),
  message: document.getElementById('message'),
};

function getSettings() {
  return new Promise((resolve) => {
    chrome.storage.local.get(DEFAULTS, (s) => resolve(s));
  });
}

function setSettings(values) {
  return new Promise((resolve) => chrome.storage.local.set(values, resolve));
}

function showMessage(text, kind) {
  els.message.textContent = text;
  els.message.className = 'message ' + (kind || '');
  els.message.classList.remove('hidden');
}

function normalizeBase(url) {
  return (url || '').trim().replace(/\/+$/, '');
}

// Tabs worth archiving: skip internal chrome:// / extension pages.
function archivable(tab) {
  return tab.url && /^https?:\/\//i.test(tab.url);
}

async function getCurrentWindowTabs() {
  return new Promise((resolve) => {
    chrome.tabs.query({ currentWindow: true }, (tabs) => resolve(tabs));
  });
}

async function refreshTabCount() {
  const tabs = await getCurrentWindowTabs();
  els.tabCount.textContent = tabs.filter(archivable).length;
}

async function postBookmarks(settings, bookmarks) {
  const base = normalizeBase(settings.backendUrl);
  const res = await fetch(base + '/api/bookmarks/bulk', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json',
      'Authorization': 'Bearer ' + settings.apiToken,
    },
    body: JSON.stringify({
      bookmarks,
      folder_name: settings.folderName ? settings.folderName.trim() : undefined,
    }),
  });
  if (!res.ok) {
    const err = await res.json().catch(() => ({}));
    throw new Error(err.error || ('HTTP ' + res.status));
  }
  return res.json();
}

async function handleSave(closeAfter) {
  const settings = await getSettings();
  if (!settings.apiToken) {
    showMessage('Set your API token in settings (⚙️) first.', 'error');
    els.settings.classList.remove('hidden');
    return;
  }

  els.saveAll.disabled = true;
  els.saveClose.disabled = true;
  showMessage('Saving…', '');

  try {
    const allTabs = await getCurrentWindowTabs();
    const tabs = allTabs.filter(archivable);
    if (tabs.length === 0) {
      showMessage('No saveable tabs (only http/https tabs are archived).', 'error');
      return;
    }

    const bookmarks = tabs.map((t) => ({ title: t.title, url: t.url }));
    const result = await postBookmarks(settings, bookmarks);
    const notes = [];
    if (result.skipped) notes.push(`${result.skipped} duplicate(s) skipped`);
    // `limited` is returned by the hosted backend when the free-plan cap is hit.
    if (result.limited) notes.push(`${result.limited} not saved — free plan limit reached`);
    const noteStr = notes.length ? ` (${notes.join('; ')})` : '';
    showMessage(`Saved ${result.created} tab(s).${noteStr}`, result.limited ? 'error' : 'success');

    // Only close once the save has been confirmed above.
    if (closeAfter) {
      await new Promise((resolve) => chrome.tabs.remove(tabs.map((t) => t.id), resolve));
    }
    await refreshTabCount();
  } catch (e) {
    showMessage('Failed: ' + e.message, 'error');
  } finally {
    els.saveAll.disabled = false;
    els.saveClose.disabled = false;
  }
}

// --- Wire up UI ---

async function init() {
  const s = await getSettings();
  els.backendUrl.value = s.backendUrl;
  els.apiToken.value = s.apiToken;
  els.folderName.value = s.folderName;
  if (!s.apiToken) els.settings.classList.remove('hidden');
  await refreshTabCount();
}

els.toggleSettings.addEventListener('click', () => els.settings.classList.toggle('hidden'));

els.saveSettings.addEventListener('click', async () => {
  await setSettings({
    backendUrl: normalizeBase(els.backendUrl.value) || DEFAULTS.backendUrl,
    apiToken: els.apiToken.value.trim(),
    folderName: els.folderName.value.trim(),
  });
  showMessage('Settings saved.', 'success');
  els.settings.classList.add('hidden');
});

els.testBtn.addEventListener('click', async () => {
  const base = normalizeBase(els.backendUrl.value);
  const token = els.apiToken.value.trim();
  if (!base || !token) { showMessage('Enter backend URL and token first.', 'error'); return; }
  showMessage('Testing…', '');
  try {
    const res = await fetch(base + '/api/me', { headers: { 'Authorization': 'Bearer ' + token } });
    if (!res.ok) throw new Error('HTTP ' + res.status);
    const data = await res.json();
    showMessage('Connected as ' + data.user.email, 'success');
  } catch (e) {
    showMessage('Connection failed: ' + e.message, 'error');
  }
});

els.saveAll.addEventListener('click', () => handleSave(false));
els.saveClose.addEventListener('click', () => handleSave(true));

els.openBackend.addEventListener('click', async () => {
  const settings = await getSettings();
  const url = normalizeBase(settings.backendUrl) || DEFAULTS.backendUrl;
  chrome.tabs.create({ url });
});

init();