import { defineStore } from 'pinia'
import { ref, computed } from 'vue'

export const useCartStore = defineStore('cart', () => {
  const items = ref([])

  const totalCount = computed(() => items.value.reduce((s, i) => s + i.qty, 0))

  function addItem(product, qty = 1) {
    const exist = items.value.find(i => i.product.id === product.id)
    if (exist) {
      exist.qty += qty
    } else {
      items.value.push({ product: { ...product }, qty })
    }
  }

  function removeItem(productId) {
    items.value = items.value.filter(i => i.product.id !== productId)
  }

  function updateQty(productId, qty) {
    const item = items.value.find(i => i.product.id === productId)
    if (item) {
      if (qty <= 0) removeItem(productId)
      else item.qty = qty
    }
  }

  function clearCart() {
    items.value = []
  }

  return { items, totalCount, addItem, removeItem, updateQty, clearCart }
})