add SMSpanel

app/Services/SmsBilling/SmsSegmentCalculator.php

@@ -0,0 +1,37 @@
+<?php
+
+namespace App\Services\SmsBilling;
+
+class SmsSegmentCalculator
+{
+    private const PERSIAN_LIMITS = [70, 64, 67];
+
+    public function countParts(string $text): int
+    {
+        $length = mb_strlen(trim($text), 'UTF-8');
+
+        if ($length <= 0) {
+            return 0;
+        }
+
+        $first = self::PERSIAN_LIMITS[0];
+        $second = self::PERSIAN_LIMITS[1];
+        $rest = self::PERSIAN_LIMITS[2];
+
+        if ($length <= $first) {
+            return 1;
+        }
+
+        if ($length <= $first + $second) {
+            return 2;
+        }
+
+        $thirdThreshold = $first + $second + $rest;
+
+        if ($length <= $thirdThreshold) {
+            return 3;
+        }
+
+        return 3 + (int) ceil(($length - $thirdThreshold) / $rest);
+    }
+}