import { getSettings } from "./vault";

const DEFAULT_CLEAR_SECONDS = 30;

let clipboardClearTimer: ReturnType<typeof setTimeout> | null = null;

async function writeToClipboard(text: string): Promise<void> {
  // Prefer chrome.scripting.executeScript which reliably works in MV3 service workers
  // by running in the context of the active tab page, falling back to direct write.
  try {
    const [tab] = await chrome.tabs.query({ active: true, currentWindow: true });
    if (tab?.id) {
      await chrome.scripting.executeScript({
        target: { tabId: tab.id },
        func: (value: string) => navigator.clipboard.writeText(value),
        args: [text],
      });
      return;
    }
  } catch {
    // Fall through to direct write
  }
  // Fallback: direct navigator.clipboard (may fail if service worker is backgrounded)
  await navigator.clipboard.writeText(text);
}

export async function copyToClipboard(
  text: string,
  _label: string,
  alreadyWritten = false,
): Promise<void> {
  if (clipboardClearTimer) {
    clearTimeout(clipboardClearTimer);
    clipboardClearTimer = null;
  }
  // The popup/content caller may have already written the clipboard from a
  // focused document with a fresh user gesture — that path is more reliable
  // than the SW's `executeScript` into the active tab. When that happens, we
  // only need to schedule the auto-clear timer here.
  if (!alreadyWritten) {
    await writeToClipboard(text);
  }

  const settingsSeconds = getSettings().clipboardClearSeconds;
  const clearAfterMs =
    (typeof settingsSeconds === "number" && settingsSeconds > 0
      ? settingsSeconds
      : DEFAULT_CLEAR_SECONDS) * 1000;

  clipboardClearTimer = setTimeout(async () => {
    try {
      await writeToClipboard("");
    } catch {}
    clipboardClearTimer = null;
  }, clearAfterMs);
}