/**
 * Keyboard command handler — routing for summon-inline:
 *   1. Restricted URL (non-http/https) → open popup
 *   2. Ping content script (150ms timeout) → if alive, send SUMMON_AUTOFILL
 *      with source:"shortcut"; content script handles inline (autofill selector
 *      or search-mode palette). Always returns early — no popup fallback.
 *   3. Content script not ready → open popup fallback
 */

const PING_TIMEOUT_MS = 150;

async function pingContentScript(tabId: number): Promise<boolean> {
  return new Promise((resolve) => {
    const timer = setTimeout(() => resolve(false), PING_TIMEOUT_MS);
    try {
      chrome.tabs.sendMessage(tabId, { type: "PING" }, (response) => {
        clearTimeout(timer);
        if (chrome.runtime.lastError) {
          resolve(false);
        } else {
          resolve(response?.ok === true);
        }
      });
    } catch {
      clearTimeout(timer);
      resolve(false);
    }
  });
}

async function openPopup(): Promise<void> {
  try {
    // chrome.action.openPopup() requires Chrome 127+ and user gesture context;
    // it may throw — that's acceptable, we degrade gracefully.
    await (chrome.action as { openPopup?: () => Promise<void> }).openPopup?.();
  } catch {
    // Silently ignore — user can click the toolbar icon instead
  }
}

export function setupCommands(): void {
  chrome.commands.onCommand.addListener(async (command) => {
    if (command !== "summon-inline") return;

    const [tab] = await chrome.tabs.query({ active: true, currentWindow: true });
    if (!tab?.id || !tab.url) return;

    // ── Step 1: restricted URL? ───────────────────────────────────
    if (!/^https?:\/\//i.test(tab.url)) {
      await openPopup();
      return;
    }

    const tabId = tab.id;

    // ── Step 2: ping existing content script ─────────────────────
    const alive = await pingContentScript(tabId);
    if (alive) {
      // Content script fully handles SUMMON_AUTOFILL with source:"shortcut":
      // shows the autofill selector when a form is present, or falls back to
      // a search-mode palette that copies to clipboard. No popup fallback needed.
      chrome.tabs.sendMessage(tabId, { type: "SUMMON_AUTOFILL", source: "shortcut" }).catch(() => {});
      return;
    }

    // ── Step 3: content script unavailable ───────────────────────
    await openPopup();
  });
}