import { QueueModel } from 'src/modules/queue/data/models/queue.model';
import { toTime } from '../../helpers/time.helper';
import * as math from 'mathjs';

export class QueueCondition {
  private ticketItems = {};
  constructor(readonly items: QueueModel[]) {
    items.forEach((item) => {
      const item_id = item.item.item.item_queue?.id ?? item.item.item.id;
      const currentItem = this.ticketItems[item_id];
      this.ticketItems[item_id] = currentItem ? [...currentItem, item] : [item];
    });
  }

  condition(item_id: string) {
    const queues: QueueModel[] = this.ticketItems[item_id] ?? [];
    const time = queues[0]?.time;
    const nearest = time ? toTime(time) : 0;
    return {
      available: queues.length == 0,
      average: this.averageTime(queues),
      nearest: nearest,
      crowded_level: queues.length,
      available_time: nearest,
    };
  }

  averageTime(queues: QueueModel[]) {
    if (queues.length == 0) return 0;
    const calledQueue = queues.filter((q) => q.status === 'called');

    const times = calledQueue.map((queue) => {
      return queue.call_time - queue.time;
    });

    return math.sum(times) / times.length;
  }
}