(function () {
  let currentTab = {
    id: null,
    url: null,
  };

  const getExtensionId = () => {
    const matches = chrome.runtime.getURL('x').match(/.*\/\/(.*)\/x$/);
    if (matches) {
      return matches[1];
    }

    return chrome.runtime.id;
  };

  // Create a new tab for the extension
  function createNewTab() {
    chrome.tabs.create({ url: 'index.html' }, function (tab) {
      currentTab = {
        id: tab.id,
        url: tab.url
      };
    });
  }

  // Focus on the open extension tab
  function focusTab(tabId) {
    var updateProperties = { "active": true };
    chrome.tabs.update(tabId, updateProperties, function (tab) { });
  }

  // Open the extension tab when the extension icon is clicked
  chrome.browserAction.onClicked.addListener(function (tab) {
    if (!currentTab || !currentTab.id) {
      createNewTab();
    } else {
      chrome.tabs.get(currentTab.id, function (tab) {
        console.log(chrome.runtime.id, tab.url);
        if (tab && tab.url && tab.url.includes(getExtensionId())) {
          focusTab(currentTab.id);
        } else {
          createNewTab();
        }
      });
    }
  });

  // When a tab is closed, check if it is the extension tab that was closed, and unset currentTabId
  chrome.tabs.onRemoved.addListener(function (tabId) {
    if (tabId === currentTab.id) {
      currentTab = {};
    }
  });
})();