Resolving fonts

app/Utils/Helpers.php

@@ -264,4 +264,29 @@ class Helpers
 
         return $value;
     }
+
+    /**
+     * Resolve the font from the supported fonts array.
+     * 
+     * @param string $font 
+     * @return array 
+     */
+    public static function resolveFont(string $font = 'Arial'): array
+    {
+        $fonts = [
+            'Arial' => '',
+            'Inter' => 'https://fonts.googleapis.com/css2?family=Inter:wght@400;600&display=swap',
+            'Roboto' => 'https://fonts.googleapis.com/css2?family=Roboto:wght@400;700&display=swap',
+            'Irish Grover' => 'https://fonts.googleapis.com/css2?family=Irish+Grover&display=swap',
+        ];
+
+        if (array_key_exists($font, $fonts)) {
+            return [
+                'name' => $font,
+                'url' => $fonts[$font],
+            ];
+        }
+
+        return ['name' => 'Arial', 'url' => $fonts['Arial']];
+    }
 }

app/Utils/HtmlEngine.php

@@ -445,6 +445,8 @@ class HtmlEngine
         $data['_rate3'] = ['value' => '', 'label' => ctrans('texts.tax')];
 
         $data['$font_size'] = ['value' => $this->settings->font_size . 'px', 'label' => ''];
+        $data['$font_name'] = ['value' => Helpers::resolveFont()['name'], 'label' => ''];
+        $data['$font_url'] = ['value' => Helpers::resolveFont()['url'], 'label' => ''];
 
         $data['$invoiceninja.whitelabel'] = ['value' => 'https://raw.githubusercontent.com/invoiceninja/invoiceninja/v5-develop/public/images/new_logo.png', 'label' => ''];
 

tests/Unit/HelpersTest.php

@@ -0,0 +1,41 @@
+<?php
+
+/**
+ * Invoice Ninja (https://invoiceninja.com).
+ *
+ * @link https://github.com/invoiceninja/invoiceninja source repository
+ *
+ * @copyright Copyright (c) 2021. Invoice Ninja LLC (https://invoiceninja.com)
+ *
+ * @license https://opensource.org/licenses/AAL
+ */
+
+namespace Tests\Unit;
+
+use App\Utils\Helpers;
+use PHPUnit\Framework\TestCase;
+
+class HelpersTest extends TestCase
+{
+    public function testFontsReturnFormat(): void
+    {
+        $font = Helpers::resolveFont();
+
+        $this->assertArrayHasKey('name', $font);
+        $this->assertArrayHasKey('url', $font);
+    }
+
+    public function testResolvingFont(): void
+    {
+        $font = Helpers::resolveFont('Inter');
+
+        $this->assertEquals('Inter', $font['name']);
+    }
+
+    public function testDefaultFontIsArial(): void
+    {
+        $font = Helpers::resolveFont();
+
+        $this->assertEquals('Arial', $font['name']);
+    }
+}