major update

lib/App/AppContainer.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace MintyPHP\App;
+
+use RuntimeException;
+
+final class AppContainer
+{
+    /** @var array<string, callable(self): mixed> */
+    private array $bindings = [];
+
+    /** @var array<string, mixed> */
+    private array $instances = [];
+
+    public function set(string $id, callable $factory): void
+    {
+        $this->bindings[$id] = $factory;
+    }
+
+    public function has(string $id): bool
+    {
+        return array_key_exists($id, $this->instances) || array_key_exists($id, $this->bindings);
+    }
+
+    public function get(string $id): mixed
+    {
+        if (array_key_exists($id, $this->instances)) {
+            return $this->instances[$id];
+        }
+
+        if (!array_key_exists($id, $this->bindings)) {
+            throw new RuntimeException('Service not bound: ' . $id);
+        }
+
+        $this->instances[$id] = ($this->bindings[$id])($this);
+        return $this->instances[$id];
+    }
+}