cbu generator (#4)

* readme updated
* cbu generator done

README.md

@@ -4,7 +4,7 @@ Generate CBU and CUIT/CUIL
 
 ## Installation
 
-Add the CompanyNameGenerator™ library to your `composer.json` file:
+Add the ArgentinaDataGenerator library to your `composer.json` file:
 
     composer require pablorsk/argentina-data-generator --dev
 
@@ -34,3 +34,7 @@ This snippet generates 5 awesome CUIT/CUIL valid numbers. Here is an example out
     cuit        // 33-37145386-0
     cuitNumber  // 33371453860
     dni         // 37145386
+
+### \ArgentinaDataGenerator\CbuFakerProvider
+
+    cbu        // 6999444785661157353820

composer.json

@@ -27,6 +27,7 @@
         "squizlabs/php_codesniffer": "3.3.0",
         "phpunit/phpunit": "7.2.6",
         "codedungeon/phpunit-result-printer": "0.19.10",
+        "pablorsk/cbu-validator-php": "^1.0",
         "sebastian/phpcpd": "4.0.0"
     },
     "autoload": {

src/CbuFakerProvider.php

@@ -0,0 +1,40 @@
+<?php
+/**
+ * Copyright (C) 1997-2018 Reyesoft <[email protected]>.
+ *
+ * This file is part of JsonApiPlayground. JsonApiPlayground can not be copied and/or
+ * distributed without the express permission of Reyesoft
+ */
+
+declare(strict_types=1);
+
+namespace ArgentinaDataGenerator;
+
+use Faker\Provider\Base;
+
+class CbuFakerProvider extends Base
+{
+    public static function cbu(): string
+    {
+        $A = random_int(1000000, 9999999); // 7
+        $Ax = self::getChecksum($A);
+        $B = random_int(1000000000000, 9999999999999);   // 13
+        $Bx = self::getChecksum($B);
+
+        return $A . $Ax . $B . $Bx;
+    }
+
+    private static function getChecksum(int $number): int
+    {
+        $value = (string) $number;
+        $ponderador = [3, 1, 7, 9];
+        $sum = 0;
+        $j = 0;
+        for ($i = strlen($value) - 1; $i >= 0; --$i) {
+            $sum += ($value[$i] * $ponderador[$j % 4]);
+            ++$j;
+        }
+
+        return (10 - $sum % 10) % 10;
+    }
+}

tests/CbuFakerProviderTest.php

@@ -0,0 +1,26 @@
+<?php
+/**
+ * Copyright (C) 1997-2018 Reyesoft <[email protected]>.
+ *
+ * This file is part of JsonApiPlayground. JsonApiPlayground can not be copied and/or
+ * distributed without the express permission of Reyesoft
+ */
+
+declare(strict_types=1);
+
+namespace Tests;
+
+use ArgentinaDataGenerator\CbuFakerProvider;
+use PHPUnit\Framework\TestCase;
+
+class CbuFakerProviderTest extends TestCase
+{
+    public function testCbu(): void
+    {
+        $generator = new CbuFakerProvider(\Faker\Factory::create());
+        for ($i = 0; $i < 100; ++$i) {
+            $cbu = $generator::cbu();
+            $this->assertTrue(\Cbu::isValid($cbu), $cbu . ' not valid.');
+        }
+    }
+}