[FEATURE] Bugfixes and optimisations

- Changed Middleware to interface - as it's easier to inherit and use in
  other frameworks/projects.

- RouterController now loads method based on request-method.

- Changed references to old Middleware abstract class.

- Middleware must now be instance of IMiddleware instead of Middleware
  class.

src/Pecee/SimpleRouter/RouterBase.php

@@ -253,7 +253,7 @@ class RouterBase {
             throw new \InvalidArgumentException('Invalid type for getParams. Must be array or null');
         }
 
-        if($controller === null && $parameters === null) {
+        if($controller === null && $parameters === null && $this->loadedRoute !== null) {
             return $this->processUrl($this->loadedRoute, null, $getParams);
         }
 

src/Pecee/SimpleRouter/RouterController.php

@@ -17,6 +17,29 @@ class RouterController extends RouterEntry {
         $this->controller = $controller;
     }
 
+    public function renderRoute(Request $request) {
+        if(is_object($this->getCallback()) && is_callable($this->getCallback())) {
+
+            // When the callback is a function
+            call_user_func_array($this->getCallback(), $this->getParameters());
+        } else {
+            // When the callback is a method
+            $controller = explode('@', $this->getCallback());
+            $className = $this->getNamespace() . '\\' . $controller[0];
+
+            $class = $this->loadClass($className);
+            $method = $request->getMethod() . ucfirst($controller[1]);
+
+            if (!method_exists($class, $method)) {
+                throw new RouterException(sprintf('Method %s does not exist in class %s', $method, $className), 404);
+            }
+
+            call_user_func_array(array($class, $method), $this->getParameters());
+
+            return $class;
+        }
+    }
+
     public function matchRoute(Request $request) {
         $url = parse_url($request->getUri());
         $url = rtrim($url['path'], '/') . '/';

src/Pecee/SimpleRouter/RouterEntry.php

@@ -2,7 +2,7 @@
 
 namespace Pecee\SimpleRouter;
 
-use Pecee\Http\Middleware\Middleware;
+use Pecee\Http\Middleware\IMiddleware;
 use Pecee\Http\Request;
 
 abstract class RouterEntry {
@@ -208,7 +208,7 @@ abstract class RouterEntry {
     public function setSettings($settings) {
         $this->settings = $settings;
 
-        if($settings['prefix']) {
+        if(isset($settings['prefix'])) {
             $this->setPrefix($settings['prefix']);
         }
 
@@ -246,7 +246,7 @@ abstract class RouterEntry {
     public function loadMiddleware(Request $request) {
         if($this->getMiddleware()) {
             $middleware = $this->loadClass($this->getMiddleware());
-            if (!($middleware instanceof Middleware)) {
+            if (!($middleware instanceof IMiddleware)) {
                 throw new RouterException($this->getMiddleware() . ' must be instance of Middleware');
             }
 

src/Pecee/SimpleRouter/RouterGroup.php

@@ -13,7 +13,7 @@ class RouterGroup extends RouterEntry {
     public function renderRoute(Request $request) {
         // Check if request method is allowed
 
-        if(strtolower($request->getUri()) == strtolower($this->prefix) || stripos($request->getUri(), $this->prefix) === 0) {
+        if(trim($this->prefix) === '' || strtolower($request->getUri()) == strtolower($this->prefix) || stripos($request->getUri(), $this->prefix) === 0) {
 
             $hasAccess = (!$this->method);