export class PrioritizedQueue {
  constructor() {
    this.buffer = [];
  }

  // Add an item to the buffer, ahead of the next lowest priority item
  add(message, priority) {
    const idx = this.buffer.findIndex((item) => item.priority < priority);
    if (idx < 0) {
      this.buffer.push({ message, priority });
    } else {
      this.buffer.splice(idx, 0, { message, priority });
    }
  }

  // Return the highest priority item in the buffer
  pop() {
    if (!this.buffer.length) {
      return null;
    }
    const item = this.buffer.shift();
    return item.message;
  }
}