const ANALYZER_URL = 'http://localhost:8088/';
const VOLUMIO_URL = 'http://localhost:3000/';

function matchingTabs(tabs, url) {
  return tabs.filter(tab => tab.url && tab.url.startsWith(url));
}

// Keep one Analyzer and one Volumio tab. Chromium starts on Analyzer, so
// Volumio can load in the background without delaying the first visible UI.
function ensureDualTabs() {
  chrome.tabs.query({ currentWindow: true }, tabs => {
    const analyzerTabs = matchingTabs(tabs, ANALYZER_URL);
    const volumioTabs = matchingTabs(tabs, VOLUMIO_URL);
    const duplicates = [...analyzerTabs.slice(1), ...volumioTabs.slice(1)]
      .map(tab => tab.id)
      .filter(id => Number.isInteger(id));

    if (duplicates.length > 0) chrome.tabs.remove(duplicates);
    if (analyzerTabs.length === 0) chrome.tabs.create({ url: ANALYZER_URL, active: true });
    if (volumioTabs.length === 0) chrome.tabs.create({ url: VOLUMIO_URL, active: false });
  });
}

// Activate an existing application tab without reloading it.
function activateOrCreate(url) {
  chrome.tabs.query({ currentWindow: true }, tabs => {
    const tab = matchingTabs(tabs, url)[0];
    if (tab) chrome.tabs.update(tab.id, { active: true });
    else chrome.tabs.create({ url, active: true });
  });
}

chrome.runtime.onMessage.addListener((msg, _sender, sendResponse) => {
  if (!msg) return;
  if (msg.cmd === 'bootstrap') {
    ensureDualTabs();
    sendResponse({ ok: true });
    return;
  }
  if (msg.cmd === 'toggle') {
    if (msg.from === 'volumio') activateOrCreate(ANALYZER_URL);
    else activateOrCreate(VOLUMIO_URL);
    sendResponse({ ok: true });
  }
});