1 files changed, 21 insertions, 0 deletions
diff --git a/src/classes/invoice_item.ts b/src/classes/invoice_item.ts
index a7a0a85..dcb917a 100644
--- a/src/classes/invoice_item.ts
+++ b/src/classes/invoice_item.ts
@@ -1,3 +1,5 @@
+import currency from "currency.js"
+
 export default class InvoiceItem {
   UnitOfMeasure: string
   Quantity: string
@@ -19,3 +21,22 @@ export default class InvoiceItem {
     this.BrandName = ""
   }
 }
+
+export const calculate = (items: InvoiceItem[]) => items.map((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.add(totalGSTValue)
+  })
+})