From 3509ea9a89cb70e8f24325aa35f010a913f6be6b Mon Sep 17 00:00:00 2001
From: AbleKSaju <126228406+AbleKSaju@users.noreply.github.com>
Date: Thu, 10 Oct 2024 15:59:10 +0530
Subject: [PATCH] feat: display grand total amount in words

---
 src/utils/printTemplates.ts      | 111 +++++++++++++++++++++++++++++++
 templates/Business.template.html |   4 ++
 2 files changed, 115 insertions(+)

diff --git a/src/utils/printTemplates.ts b/src/utils/printTemplates.ts
index 94f63471..a2837fba 100644
--- a/src/utils/printTemplates.ts
+++ b/src/utils/printTemplates.ts
@@ -12,6 +12,7 @@ import {
   getSavePath,
   showExportInFolder,
 } from './ui';
+import { Money } from 'pesa';
 
 export type PrintTemplateHint = {
   [key: string]: string | PrintTemplateHint | PrintTemplateHint[];
@@ -63,6 +64,10 @@ export async function getPrintTemplatePropValues(
     (values.doc as PrintTemplateData).showHSN = showHSN(doc);
   }
 
+  (values.doc as PrintTemplateData).grandTotalInWords = getGrandTotalInWords(
+    (doc.grandTotal as Money).float
+  );
+
   return values;
 }
 
@@ -95,6 +100,112 @@ export function getPrintTemplatePropHints(schemaName: string, fyo: Fyo) {
   return hints;
 }
 
+function getGrandTotalInWords(total: number) {
+  const formattedTotal = total.toFixed(2);
+
+  const [integerPart, decimalPart] = formattedTotal.split('.');
+
+  const ones = [
+    '',
+    t`One`,
+    t`Two`,
+    t`Three`,
+    t`Four`,
+    t`Five`,
+    t`Six`,
+    t`Seven`,
+    t`Eight`,
+    t`Nine`,
+  ];
+
+  const teens = [
+    t`Ten`,
+    t`Eleven`,
+    t`Twelve`,
+    t`Thirteen`,
+    t`Fourteen`,
+    t`Fifteen`,
+    t`Sixteen`,
+    t`Seventeen`,
+    t`Eighteen`,
+    t`Nineteen`,
+  ];
+
+  const tens = [
+    '',
+    '',
+    t`Twenty`,
+    t`Thirty`,
+    t`Forty`,
+    t`Fifty`,
+    t`Sixty`,
+    t`Seventy`,
+    t`Eighty`,
+    t`Ninety`,
+  ];
+
+  const scales = ['', t`Thousand`, t`Million`, t`Billion`];
+
+  function convertThreeDigitNumber(num: number) {
+    let result = '';
+
+    const hundredDigit = Math.floor(num / 100);
+    const remainder = num % 100;
+
+    if (hundredDigit > 0) {
+      result += ones[hundredDigit] + ` ${t`Hundred`}`;
+    }
+
+    if (remainder > 0) {
+      if (hundredDigit > 0) {
+        result += ` ${t`And`} `;
+      }
+
+      if (remainder < 10) {
+        result += ones[remainder];
+      } else if (remainder < 20) {
+        result += teens[remainder - 10];
+      } else {
+        const tensDigit = Math.floor(remainder / 10);
+        const onesDigit = remainder % 10;
+        result += tens[tensDigit];
+        if (onesDigit > 0) {
+          result += ' ' + ones[onesDigit];
+        }
+      }
+    }
+
+    return result;
+  }
+
+  let spelledOutInteger = '';
+  const integerGroups = integerPart.match(/(\d{1,3})(?=(\d{3})*$)/g) || [];
+  const groupCount = integerGroups.length;
+
+  integerGroups.forEach((group, index) => {
+    const groupValue = parseInt(group);
+
+    if (groupValue > 0) {
+      const groupText = convertThreeDigitNumber(groupValue);
+      const groupSuffix = scales[groupCount - index - 1];
+      spelledOutInteger +=
+        groupText + (groupSuffix ? ' ' + groupSuffix : '') + ' ';
+    }
+  });
+
+  spelledOutInteger = spelledOutInteger.trim() || t`Zero`;
+
+  let spelledOutDecimal = '';
+  const decimalCents = parseInt(decimalPart);
+
+  if (decimalCents !== 0) {
+    spelledOutDecimal =
+      ` ${t`and`} ` + convertThreeDigitNumber(decimalCents) + ` ${t`Paisa`}`;
+  }
+
+  return `${spelledOutInteger}${spelledOutDecimal} ${t`only`}`;
+}
+
 function showHSN(doc: Doc): boolean {
   const items = doc.items;
   if (!Array.isArray(items)) {
diff --git a/templates/Business.template.html b/templates/Business.template.html
index ae3138a0..890fa4cb 100644
--- a/templates/Business.template.html
+++ b/templates/Business.template.html
@@ -126,5 +126,9 @@
       <h3 class="text-lg font-semibold">Notes</h3>
       <p class="mt-4 text-lg whitespace-pre-line">{{ doc.terms }}</p>
     </section>
+    <div class="flex justify-end mt-10">
+      <h3 class="text-lg font-semibold mr-2">Grand Total In Words:</h3>
+      <p>{{doc.grandTotalInWords}}</p>
+    </div>
   </footer>
 </main>