Add Full Account Balance on Guest Invoice View

guest_view_invoice.php

@@ -135,10 +135,36 @@ if ($invoice_status !== "Paid" && $invoice_status !== "Draft" && $invoice_status
 // Invoice individual items
 $sql_invoice_items = mysqli_query($mysqli, "SELECT * FROM invoice_items WHERE item_invoice_id = $invoice_id ORDER BY item_order ASC");
 
+
+// Get Total Account Balance
+//Add up all the payments for the invoice and get the total amount paid to the invoice
+$sql_invoice_amounts = mysqli_query($mysqli, "SELECT SUM(invoice_amount) AS invoice_amounts FROM invoices WHERE invoice_client_id = $client_id AND invoice_status NOT LIKE 'Draft' AND invoice_status NOT LIKE 'Cancelled' ");
+$row = mysqli_fetch_array($sql_invoice_amounts);
+
+$account_balance = floatval($row['invoice_amounts']);
+
+$sql_amount_paid = mysqli_query($mysqli, "SELECT SUM(payment_amount) AS amount_paid FROM payments, invoices WHERE payment_invoice_id = invoice_id AND invoice_client_id = $client_id");
+$row = mysqli_fetch_array($sql_amount_paid);
+
+$account_amount_paid = floatval($row['amount_paid']);
+
+$account_balance = $account_balance - $account_amount_paid;
+//set Text color on balance
+if ($balance > 0) {
+    $balance_text_color = "text-danger font-weight-bold";
+} else {
+    $balance_text_color = "";
+}
+
 ?>
 
     <div class="card">
         <div class="card-header bg-light d-print-none">
+            <div class="row">
+                <div class="col-6">
+                    <h4 class="mt-1">Account Balance: <b><?php echo numfmt_format_currency($currency_format, $account_balance, $invoice_currency_code); ?></b></h4>
+                </div>
+                <div class="col-6">
                     <div class="float-right">
                         <a class="btn btn-secondary" data-toggle="collapse" href="#collapsePreviousInvoices"><i class="fas fa-fw fa-history mr-2"></i>Invoice History</a>
                         <a class="btn btn-primary" href="#" onclick="window.print();"><i class="fas fa-fw fa-print mr-2"></i>Print</a>
@@ -149,6 +175,8 @@ $sql_invoice_items = mysqli_query($mysqli, "SELECT * FROM invoice_items WHERE it
                         <?php } ?>
                     </div>
                 </div>
+            </div>
+        </div>
         <div class="card-body">
             <div class="row mb-4">
                 <div class="col-2">