fullcart/src/actions/setQuantity.ts

Add stripe checkout to any website

import type { Customer } from '../schemas/customerSchema'
import type { Product } from '../schemas/productSchema'
import { customer } from '../stores/customer'
import { removeItem } from './removeItem'

export const setQuantity = (
  productId: Product['id'],
  quantity: Customer['lines'][number]['quantity'],
) => {
  const lines = customer.get().lines
  const index = lines.findIndex((line) => line.productId === productId)

  if (quantity <= 0) removeItem(productId)
  else if (index < 0) {
    lines.push({ productId, quantity })
    customer.setKey('lines', lines)
  } else {
    lines[index].quantity = quantity
    customer.setKey('lines', lines)
  }
}