export class RequestQueue<T = unknown> {
  private pendingPromise = false;
  private items: Array<{
    action: () => Promise<T>;
    resolve: (value: T) => void;
    reject: (reason?: any) => void;
  }> = [];

  enqueue(action: () => Promise<T>) {
    return new Promise((resolve, reject) => {
      this.items.push({ action, resolve, reject });
      this.dequeue();
    });
  }

  async dequeue() {
    if (this.pendingPromise) return;

    const item = this.items.shift();
    if (!item) return;

    try {
      this.pendingPromise = true;
      const payload = await item.action();
      this.pendingPromise = false;

      item.resolve(payload);
    } catch (e) {
      this.pendingPromise = false;
      item.reject(e);
    } finally {
      this.dequeue();
    }
  }
}