import type { Product } from '@/models/products'

type ProductListHandler = (products: Product[]) => void

const handlers = new Set<ProductListHandler>()
let lastProductsList: Product[] | null = null

export function subscribeProductListStream(handler: ProductListHandler) {
  handlers.add(handler)

  if (lastProductsList?.length) {
    handler(lastProductsList)
  }

  return () => {
    handlers.delete(handler)
  }
}

export function applyProductsListFromStream(products: Product[]) {
  if (!Array.isArray(products) || !products.length) {
    return
  }

  lastProductsList = products
  handlers.forEach((handler) => handler(products))
}

export function getLastStreamProductsList(): Product[] | null {
  return lastProductsList
}