import type { BrowserWindow } from 'electron';

export type MainWindowProvider = BrowserWindow | (() => BrowserWindow | null);
export type EnsureMainWindow = () => BrowserWindow | null;

export function resolveMainWindow(provider: MainWindowProvider): BrowserWindow | null {
  const window = typeof provider === 'function' ? provider() : provider;
  return window && !window.isDestroyed?.() ? window : null;
}

export function showMainWindow(window: BrowserWindow | null): void {
  if (!window || window.isDestroyed()) return;
  if (window.isMinimized()) window.restore();
  window.show();
  window.focus();
}

/** A newly reopened renderer must finish loading before it can receive menu actions. */
export function sendWhenWindowReady(
  window: BrowserWindow | null,
  channel: string,
  ...args: unknown[]
): void {
  if (!window || window.isDestroyed() || window.webContents.isDestroyed()) return;
  const contents = window.webContents;
  const send = (): void => {
    contents.removeListener('destroyed', cancel);
    if (!window.isDestroyed() && !contents.isDestroyed()) contents.send(channel, ...args);
  };
  const cancel = (): void => {
    contents.removeListener('did-finish-load', send);
  };
  if (contents.isLoadingMainFrame() || !contents.getURL()) {
    contents.once('did-finish-load', send);
    contents.once('destroyed', cancel);
  } else {
    send();
  }
}