Add CounterRepositoryInterface

composer.json

@@ -19,11 +19,13 @@
         }
     ],
     "require": {
+        "php": "^7.4"
     },
     "require-dev": {
     },
     "autoload": {
         "psr-4": {
+            "Contracts\\Komarev\\GitHubProfileViewsCounter\\": "contracts/",
             "Komarev\\GitHubProfileViewsCounter\\": "src/"
         }
     },

composer.lock

@@ -0,0 +1,19 @@
+{
+    "_readme": [
+        "This file locks the dependencies of your project to a known state",
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+        "This file is @generated automatically"
+    ],
+    "content-hash": "d6dfebb57666653dd233e3ce73e99b17",
+    "packages": [],
+    "packages-dev": [],
+    "aliases": [],
+    "minimum-stability": "dev",
+    "stability-flags": [],
+    "prefer-stable": true,
+    "prefer-lowest": false,
+    "platform": {
+        "php": "^7.4"
+    },
+    "platform-dev": []
+}

contracts/CounterRepositoryInterface.php

@@ -0,0 +1,21 @@
+<?php
+
+/*
+ * This file is part of GitHub Profile Views Counter.
+ *
+ * (c) Anton Komarev <anton@komarev.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Contracts\Komarev\GitHubProfileViewsCounter;
+
+interface CounterRepositoryInterface
+{
+    public function getCount(): int;
+
+    public function incrementCount(): void;
+}

public/index.php

@@ -18,8 +18,7 @@ $basePath = realpath(__DIR__ . '/..');
 $resourcesPath = $basePath . '/resources';
 $storagePath = $basePath . '/storage';
 
-require_once $basePath . '/src/CounterImageRendererService.php';
-require_once $basePath . '/src/CounterFileRepository.php';
+require $basePath . '/vendor/autoload.php';
 
 $username = $_GET['username'] ?? '';
 $username = trim($username);

src/CounterFileRepository.php

@@ -13,7 +13,9 @@ declare(strict_types=1);
 
 namespace Komarev\GitHubProfileViewsCounter;
 
-final class CounterFileRepository
+use Contracts\Komarev\GitHubProfileViewsCounter\CounterRepositoryInterface;
+
+final class CounterFileRepository implements CounterRepositoryInterface
 {
     private string $counterPath;