import { useEffect } from "react";

const APP_COMMAND_EVENT = "masters_toolkit_app_command_v1";

export function dispatchAppCommand(command: string): void {
  if (typeof window === "undefined") return;
  window.dispatchEvent(new CustomEvent(APP_COMMAND_EVENT, { detail: { command } }));
}

export function useAppCommandListener(onCommand: (command: string) => void): void {
  useEffect(() => {
    const handler = (event: Event) => {
      const custom = event as CustomEvent<{ command?: string }>;
      const command = String(custom.detail?.command || "").trim();
      if (!command) return;
      onCommand(command);
    };
    window.addEventListener(APP_COMMAND_EVENT, handler as EventListener);
    return () => window.removeEventListener(APP_COMMAND_EVENT, handler as EventListener);
  }, [onCommand]);
}