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feat: Add/update bank processor for HDFC #2

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241 changes: 241 additions & 0 deletions Services/BankStatementProcessor/bankStatementProcessor-HDFC.js
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Original file line number Diff line number Diff line change
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/**
* Generated by Gemini AI - Attempt 5
* Processes bank statement data from Excel
* @param {Array} rawData - Array of objects from bank statement Excel
* @returns {Object} Processed bank statement data
*/
function processBankStatement(rawData) {
const bank_details = {
bank_name: null,
opening_balance: 0,
ifsc: null,
address: null,
city: null,
account_no: null,
account_holder_name: null,
branch_name: null,
branch_code: null
};
const transactions = [];
let headerRowIndex = -1;
let headerKeys = {};

// Helper function to extract a date in YYYY-MM-DD format
function formatDate(dateString) {
if (!dateString) return null;

const dateFormats = [
{ regex: /(\d{2})\/(\d{2})\/(\d{2})/, format: (m) => `20${m[3]}-${m[2]}-${m[1]}` }, // DD/MM/YY
{ regex: /(\d{2})\/(\d{2})\/(\d{4})/, format: (m) => `${m[3]}-${m[2]}-${m[1]}` }, // DD/MM/YYYY
{ regex: /(\d{4})-(\d{2})-(\d{2})/, format: (m) => `${m[1]}-${m[2]}-${m[3]}` }, // YYYY-MM-DD
{ regex: /(\d{2})-(\w{3})-(\d{2})/, format: (m) => { // DD-MON-YY
const monthMap = {
'JAN': '01', 'FEB': '02', 'MAR': '03', 'APR': '04', 'MAY': '05', 'JUN': '06',
'JUL': '07', 'AUG': '08', 'SEP': '09', 'OCT': '10', 'NOV': '11', 'DEC': '12'
};
return `20${m[3]}-${monthMap[m[2].toUpperCase()] || '01'}-${m[1]}`;
}},
{ regex: /(\d{2})-(\w{3})-(\d{4})/, format: (m) => { // DD-MON-YYYY
const monthMap = {
'JAN': '01', 'FEB': '02', 'MAR': '03', 'APR': '04', 'MAY': '05', 'JUN': '06',
'JUL': '07', 'AUG': '08', 'SEP': '09', 'OCT': '10', 'NOV': '11', 'DEC': '12'
};
return `${m[3]}-${monthMap[m[2].toUpperCase()] || '01'}-${m[1]}`;
}}
];

for (const format of dateFormats) {
const match = dateString.match(format.regex);
if (match) {
return format.format(match);
}
}
console.warn(`Could not parse date: ${dateString}`);
return null;
}

// 1. Extract Bank Details
for (let i = 0; i < Math.min(15, rawData.length); i++) {
const row = rawData[i];
for (const key in row) {
const value = row[key];
if (typeof value === 'string') {
if (!bank_details.bank_name && value.includes("BANK")) {
bank_details.bank_name = value.split("BANK")[0].trim();
}
if (!bank_details.account_holder_name && value.includes("MR") ) {
bank_details.account_holder_name = value.trim();
}

if (!bank_details.address && (value.toLowerCase().includes("address") || value.toLowerCase().includes("add:")) ) {
bank_details.address = (bank_details.address || "") + " " +value.replace(/address:|address/gi, '').trim();
}

if (!bank_details.branch_name && value.toLowerCase().includes("account branch")) {
bank_details.branch_name = value.replace(/Account Branch :/gi, '').trim();
}
if (!bank_details.city && value.toLowerCase().includes("city")) {
bank_details.city = value.replace(/City :/gi, '').trim();
}

if (!bank_details.ifsc) {
const ifscRegex = /(IFSC|IFSC Code|IFSC Code:|RTGS\/NEFT IFSC|RTGS\/NEFT IFSC :)\s*:?\s*([A-Za-z]{4}[0-9]{6,7})/i;
const ifscMatch = value.match(ifscRegex);
if (ifscMatch && ifscMatch[2]) {
bank_details.ifsc = ifscMatch[2].trim();
}
}
if (!bank_details.account_no && value.toLowerCase().includes("account no")) {
bank_details.account_no = value.replace(/Account No :|Account No:/gi, '').trim().split(' ')[0];
}
if (!bank_details.opening_balance && value.toLowerCase().includes("opening balance")) {

try {
bank_details.opening_balance = parseFloat(value.replace(/Opening Balance:|Opening Balance/gi, '').trim())
} catch(e) {
bank_details.opening_balance = 0;
}

}
}
}
if(bank_details.ifsc){
break;
}
}

if (!bank_details.ifsc) {
for (let i = 0; i < Math.min(15, rawData.length); i++) {
const row = rawData[i];
for (const key in row) {
const value = row[key];
if (typeof value === 'string') {
if (!bank_details.ifsc) {
const ifscRegex = /(IFSC|IFSC Code|IFSC Code:|RTGS\/NEFT IFSC|RTGS\/NEFT IFSC :)\s*:?\s*([A-Za-z]{4}[0-9]{6,7})/i;
const ifscMatch = value.match(ifscRegex);
if (ifscMatch && ifscMatch[2]) {
bank_details.ifsc = ifscMatch[2].trim();
break;
}
}

}
}
if(bank_details.ifsc){
break;
}

}
}
// 2. & 3. Find Header Row and Process Transactions
for (let i = 0; i < rawData.length; i++) {
const row = rawData[i];
let isHeaderRow = false;

for (const key in row) {
const value = row[key];
if (typeof value === 'string' &&
(value.toLowerCase().includes("date") ||
value.toLowerCase().includes("narration") ||
value.toLowerCase().includes("details") ||
value.toLowerCase().includes("withdrawal") ||
value.toLowerCase().includes("debit") ||
value.toLowerCase().includes("deposit") ||
value.toLowerCase().includes("credit") ||
value.toLowerCase().includes("balance"))) {
isHeaderRow = true;
break;
}
}

if (isHeaderRow) {
headerRowIndex = i;
for (const key in row) {
const value = row[key];
if (typeof value === 'string') {
if (value.toLowerCase().includes("date")) {
headerKeys.date = key;
} else if (value.toLowerCase().includes("narration") || value.toLowerCase().includes("details")) {
headerKeys.narration = key;
} else if (value.toLowerCase().includes("withdrawal") || value.toLowerCase().includes("debit")) {
headerKeys.withdrawal = key;
} else if (value.toLowerCase().includes("deposit") || value.toLowerCase().includes("credit")) {
headerKeys.deposit = key;
} else if (value.toLowerCase().includes("balance")) {
headerKeys.balance = key;
}

}
}
break;
}
}

if (headerRowIndex !== -1) {
let voucher_number = 1;
for (let i = headerRowIndex + 1; i < rawData.length; i++) {
const row = rawData[i];
if (!row) continue;

const dateString = row[headerKeys.date];
const date = formatDate(dateString);
const desc = row[headerKeys.narration] || '';
let amount = null;
let type = null;

if (headerKeys.withdrawal && row[headerKeys.withdrawal] !== null && row[headerKeys.withdrawal] !== undefined) {
try {
amount = parseFloat(row[headerKeys.withdrawal]);
} catch (e) {
amount = null;
}
if (!isNaN(amount)) {
type = "withdrawal";
} else {
amount = null;
}

}
if (headerKeys.deposit && row[headerKeys.deposit] !== null && row[headerKeys.deposit] !== undefined) {
try {
amount = parseFloat(row[headerKeys.deposit]);
} catch (e) {
amount = null;
}
if (!isNaN(amount)) {
type = "deposit";
} else {
amount = null;
}
}
let balance = null;
if(headerKeys.balance){
try {
balance = parseFloat(row[headerKeys.balance]);
} catch (e) {
balance = null;
}
}

if(date && (type === "withdrawal" || type === "deposit") && amount !== null){
transactions.push({
date,
voucher_number: voucher_number++,
amount,
desc,
from: null,
to: null,
type,
balance
});
}
}
}
if (!bank_details.ifsc) {
bank_details.ifsc = null
}

return { bank_details, transactions };
}

module.exports = processBankStatement;