import type { CartItem } from '../stores/types';

interface SharedWorkerGlobalScope extends WindowOrWorkerGlobalScope {
  onconnect: ((e: MessageEvent) => void) | null;
}

let cartData: CartItem[] = [];
// 储存所有页面的端口
const ports: MessagePort[] = [];
(self as unknown as SharedWorkerGlobalScope).onconnect = (e: MessageEvent) => {
  const port = e.ports[0];
  ports.push(port);

  // 新页面连接，发送当前数据
  port.postMessage(cartData);

  port.onmessage = function (e) {
    cartData = e.data; // 更新共享状态
    // 广播给所有其它的页面
    ports.forEach(p => {
      if (p !== port) {
        p.postMessage(cartData);
      }
    });
  };

  port.start();
};