<?php
class Router {
    protected $controller = 'HomeController';
    protected $method = 'index';
    protected $params = [];
    // Main Routing Logic
    public function route() {
        $url = $this->parseUrl();
        $controllerPath = __DIR__ . '/../app/controllers/';
        // Controller Check (Case-insensitive)
        if (isset($url[0])) {
            $candidate = ucfirst(strtolower($url[0])) . 'Controller';
            if (file_exists($controllerPath . $candidate . '.php')) {
                $this->controller = $candidate;
                unset($url[0]);
            }
        }
        require_once $controllerPath . $this->controller . '.php';
        $this->controller = new $this->controller;
        // Method Check (Case-insensitive)
        if (isset($url[1])) {
            $candidateMethod = $url[1];
            foreach (get_class_methods($this->controller) as $methodName) {
                if (strcasecmp($methodName, $candidateMethod) === 0 && strpos($methodName, '_') !== 0) {
                    $this->method = $methodName;
                    unset($url[1]);
                    break;
                }
            }
        }
        // Params & Execution
        $this->params = $url ? array_values($url) : [];
        call_user_func_array([$this->controller, $this->method], $this->params);
    }
    // URL Parser
    private function parseUrl() {
        if (isset($_GET['url'])) {
            return explode('/', filter_var(rtrim($_GET['url'], '/'), FILTER_SANITIZE_URL));
        }
        return [];
    }
}