import currency from "currency.js"

export default class InvoiceItem {
  UnitOfMeasure: string
  Quantity: string
  Name: string
  Description: string
  HSN: string
  UnitPrice: string
  GSTPercentage: string
  BrandName: string

  constructor() {
    this.Name = ''
    this.Description = ''
    this.HSN = ''
    this.UnitPrice = ''
    this.GSTPercentage = ''
    this.UnitOfMeasure = ''
    this.Quantity = ""
    this.BrandName = ""
  }
}

export const calculate = (x: InvoiceItem) => {
  const quantity = currency(x.Quantity)
  const unitPrice = currency(x.UnitPrice)
  const gstPercentage = currency(x.GSTPercentage)
  const gstValue = unitPrice.multiply(gstPercentage).divide(100)
  const totalGSTValue = gstValue.multiply(quantity)
  const amountWithoutGST = unitPrice.multiply(quantity)

  return({
    ...x
    , Quantity: quantity
    , UnitPrice: unitPrice
    , GSTValue: gstValue
    , TotalGSTValue: totalGSTValue
    , AmountWithoutGST: amountWithoutGST
    , TotalAmount: amountWithoutGST.multiply(gstPercentage).divide(100).add(amountWithoutGST)
  })
}

export const calculateArr = (items: InvoiceItem[]) => 
  items.map((x: InvoiceItem) => calculate(x))

export const calculateTotal = (items: InvoiceItem[]) => 
  items.reduce((total, item) => {
    const c = calculate(item)

    return ({
      TotalQuantity: total.TotalQuantity.add(c.Quantity),
      TotalGSTValue: total.TotalGSTValue.add(c.TotalGSTValue),
      TotalWithoutGST: total.TotalWithoutGST.add(c.AmountWithoutGST),
      TotalWithGST: total.TotalWithGST.add(c.TotalAmount)
    })
  }, {
    TotalQuantity: currency(0),
    TotalGSTValue: currency(0),
    TotalWithoutGST: currency(0),
    TotalWithGST: currency(0)
  })