// Only the enabled preference is saved. Transaction records stay in bank tabs.
let tasks = Promise.resolve();
let lastNativeShortcutAt = 0;
function enqueue(task) {
  tasks = tasks.then(task).catch(error => console.warn('Merchant Lens setting update failed:', error.message));
  return tasks;
}
async function refreshAction() {
  const {enabled = true} = await chrome.storage.local.get('enabled');
  const state = enabled ? 'enabled' : 'disabled';
  await Promise.all([
    chrome.action.setIcon({path:{16:`icons/${state}-16.png`,32:`icons/${state}-32.png`}}),
    chrome.action.setTitle({title:`Merchant Lens — ${state}\nClick or Alt+Shift+M to ${enabled ? 'disable' : 'enable'}`}),
    chrome.action.setBadgeText({text: enabled ? '' : 'OFF'}),
    chrome.action.setBadgeBackgroundColor({color:'#64717d'})
  ]);
  // Push the setting directly as well as through storage change events.
  const tabs = await chrome.tabs.query({});
  await Promise.all(tabs.map(tab => chrome.tabs.sendMessage(tab.id,
    {type:'merchant-lens:set-enabled',enabled}).catch(() => null)));
}
async function toggle() {
  const {enabled = true} = await chrome.storage.local.get('enabled');
  await chrome.storage.local.set({enabled:!enabled});
  await refreshAction();
}
chrome.action.onClicked.addListener(() => { void enqueue(toggle); });
chrome.commands.onCommand.addListener(command => {
  if (command === 'toggle-merchant-lens') {
    lastNativeShortcutAt = Date.now();
    void enqueue(toggle);
  }
});
chrome.runtime.onMessage.addListener((message, sender, respond) => {
  if (message?.type !== 'merchant-lens:shortcut') return;
  // A page fallback may accompany the native command. Count one keypress once.
  const at = Number(message.at);
  void enqueue(async () => {
    if (!Number.isFinite(at) || Math.abs(lastNativeShortcutAt - at) > 200) await toggle();
    respond({ok:true});
  });
  return true;
});
chrome.storage.onChanged.addListener((changes, area) => {
  if (area === 'local' && changes.enabled) void enqueue(refreshAction);
});
chrome.runtime.onInstalled.addListener(() => { void enqueue(refreshAction); });
chrome.runtime.onStartup.addListener(() => { void enqueue(refreshAction); });
void enqueue(refreshAction);