2 files changed, 37 insertions, 3 deletions
diff --git a/src/classes/invoice.ts b/src/classes/invoice.ts
index 213eddc..0fee42f 100644
--- a/src/classes/invoice.ts
+++ b/src/classes/invoice.ts
@@ -1,7 +1,7 @@
 import Address from './address'
 import Item from './item'
 
-export default class Customer {
+export default class Invoice {
   InvoiceDate: string
   InvoiceNumber: number
   BillingAddress: Address
@@ -32,3 +32,17 @@ export default class Customer {
     this.CustomerWebsite = ""
   }
 }
+
+export class InvoiceTotal {
+  TotalQuantity: string
+  TotalGSTValue: string
+  TotalWithoutGST: string
+  TotalWithGST: string
+
+  constructor() {
+    this.TotalQuantity = ""
+    this.TotalGSTValue = ""
+    this.TotalWithoutGST = ""
+    this.TotalWithGST = ""
+  }
+}
diff --git a/src/classes/invoice_item.ts b/src/classes/invoice_item.ts
index c3da433..fe92f10 100644
--- a/src/classes/invoice_item.ts
+++ b/src/classes/invoice_item.ts
@@ -22,7 +22,7 @@ export default class InvoiceItem {
   }
 }
 
-export const calculate = (items: InvoiceItem[]) => items.map((x: InvoiceItem) => {
+export const calculate = (x: InvoiceItem) => {
   const quantity = currency(x.Quantity)
   const unitPrice = currency(x.UnitPrice)
   const gstPercentage = currency(x.GSTPercentage)
@@ -39,4 +39,24 @@ export const calculate = (items: InvoiceItem[]) => items.map((x: InvoiceItem) =>
     , 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)
+  })