(function () {
  'use strict';

  var serverUrl = '';
  var noteId = null;
  var lastBody = '';
  var autosaveTimer = null;

  var noteEl = document.getElementById('note');
  var userEl = document.getElementById('user');
  var saveBtn = document.getElementById('save');
  var captureBtn = document.getElementById('capture-page');
  var statusEl = document.getElementById('status');
  var userOptsBtn = document.getElementById('open-options');

  function showStatus(msg, ok) {
    statusEl.textContent = msg;
    statusEl.className = 'status ' + (ok ? 'ok' : 'err');
    if (ok) setTimeout(function () { if (statusEl.textContent === msg) statusEl.textContent = ''; }, 3000);
  }

  function currentBody() { return noteEl.value; }

  async function loadUsers() {
    try {
      const r = await browser.runtime.sendMessage({ kind: 'list_users' });
      const users = (r && r.users) || [];
      const saved = await browser.storage.sync.get('username').then(x => x.username);
      userEl.innerHTML = '';
      for (const u of users) {
        const opt = document.createElement('option');
        opt.value = u.name;
        opt.textContent = u.name;
        userEl.appendChild(opt);
      }
      if (saved && [...userEl.options].some(o => o.value === saved)) {
        userEl.value = saved;
      }
    } catch (e) {
      showStatus('Cannot load users: ' + e.message, false);
    }
  }

  async function captureContext() {
    try {
      const tabs = await browser.tabs.query({ active: true, currentWindow: true });
      if (!tabs.length || tabs[0].id == null) return;
      const ctx = await browser.tabs.sendMessage(tabs[0].id, { kind: 'get_context' }, { frameId: 0 });
      if (ctx && ctx.selection && !noteEl.value) {
        noteEl.value = ctx.selection;
      }
      if (ctx) {
        noteEl.dataset.pageTitle = ctx.title || '';
        noteEl.dataset.pageUrl = ctx.url || '';
      }
    } catch (e) {
      // no selection / content script unavailable on this page — ignore
    }
  }

  async function capturePage() {
    var title = noteEl.dataset.pageTitle || '';
    var url = noteEl.dataset.pageUrl || '';
    if (!title && !url) { showStatus('No page to capture', false); return; }
    var link = '[' + (title || url) + '](' + (url || '') + ')';
    var v = noteEl.value;
    if (v && !/\n$/.test(v)) v += '\n';
    noteEl.value = v + link + ' #bookmark\n';

    captureBtn.disabled = true;
    showStatus('Capturing full page…', true);
    try {
      const tabs = await browser.tabs.query({ active: true, currentWindow: true });
      if (!tabs.length || tabs[0].id == null) { showStatus('No active tab ', false); return; }
      const shot = await browser.runtime.sendMessage({
        kind: 'capture_full_page',
        tabId: tabs[0].id,
        windowId: tabs[0].windowId,
      });
      const r = await browser.runtime.sendMessage({
        kind: 'upload_attachment',
        dataUrl: shot.dataUrl,
        filename: 'page.png',
        username: userEl.value,
      });
      noteEl.value += '![Screenshot](' + r.url + ')\n';
      showStatus('Full-page screenshot attached', true);
    } catch (e) {
      showStatus('Screenshot failed: ' + e.message, false);
    } finally {
      captureBtn.disabled = false;
    }

    noteEl.focus();
    scheduleAutosave();
  }

  async function save() {
    var body = currentBody();
    if (!body.trim()) { showStatus('Nothing to save', false); return; }
    if (body === lastBody && noteId) return;
    saveBtn.disabled = true;
    try {
      const note = await browser.runtime.sendMessage({
        kind: 'save_note',
        id: noteId,
        body: body,
        username: userEl.value,
      });
      noteId = note.id;
      lastBody = body;
      var tags = (note.tags || []).map(function (t) { return '#' + t; }).join(' ');
      showStatus('Saved' + (tags ? ' · ' + tags : ''), true);
    } catch (e) {
      showStatus('Error: ' + e.message, false);
    } finally {
      saveBtn.disabled = false;
    }
  }

  function scheduleAutosave() {
    if (autosaveTimer) clearTimeout(autosaveTimer);
    autosaveTimer = setTimeout(function () {
      autosaveTimer = null;
      save();
    }, 8000);
  }

  noteEl.addEventListener('input', scheduleAutosave);

  userEl.addEventListener('change', function () {
    browser.storage.sync.set({ username: userEl.value });
  });

  document.getElementById('logo').addEventListener('click', function () {
    browser.storage.sync.get('serverUrl').then(function (r) {
      var url = (r.serverUrl || '').replace(/\/+$/, '');
      if (url) browser.tabs.create({ url: url });
    });
  });

  saveBtn.addEventListener('click', function () {
    if (autosaveTimer) { clearTimeout(autosaveTimer); autosaveTimer = null; }
    save();
  });

  captureBtn.addEventListener('click', function () {
    if (autosaveTimer) { clearTimeout(autosaveTimer); autosaveTimer = null; }
    capturePage();
  });

  userOptsBtn.addEventListener('click', function (e) {
    e.preventDefault();
    browser.runtime.openOptionsPage();
  });

  function updateIndicator() {
    var el = document.getElementById('server-indicator');
    var display = serverUrl ? serverUrl.replace(/^https?:\/\//, '') : 'Set server URL…';
    el.textContent = display;
    el.title = serverUrl || '';
  }

  browser.storage.sync.get('serverUrl').then(function (r) {
    serverUrl = (r.serverUrl || '').replace(/\/+$/, '');
    updateIndicator();
    loadUsers();
  });

  captureContext();
  noteEl.focus();
})();