<?php
namespace Core;

class Router
{
    private
        $routes = [],
        $params = [];

    public function getRoutes()
    {
        return $this->routes;
    }

    public function getParams()
    {
        return $this->params;
    }

    public function add($route, $params = [])
    {
        $route = preg_replace('/\//', '\/', $route);
        $route = preg_replace('/\{([a-z]+)\}/', '(?P<\1>[a-z-]+)', $route);
        $route = preg_replace('/\{([a-z]+):([^\}]+)\}/', '(?P<\1>\2)', $route);
        $route = '/^'.$route.'$/';

        if ($this->routes[$route] = $params) {
            return true;
        }
        return false;
    }

    public function match($url)
    {
        $url = htmlspecialchars($url);

        foreach ($this->routes as $route => $params) {
            if (preg_match($route, $url, $matches)) {
                foreach ($matches as $key => $match) {
                    if (is_string($key)) {
                        $params[$key] = $match;
                    }
                }
                if ($putParams = $this->params = $params) {
                    return true;
                }
            }
        }

        return false;
    }

    public function dispatch($url)
    {
        $url = $this->removeQueryStringVariable($url);
        if ($this->match($url)) {
            $controller = $this->params['controller'];
            $controller = $this->convertToStudlyCaps($controller);
            $controller = $this->getNamespace($controller);

            if (class_exists($controller)) {
                $object = new $controller();

                $action = $this->params['action'];
                $action = $this->convertToCamelCaps($action);

                if (is_callable([$object, $action])) {
                    if (array_key_exists('id', $this->params)) {
                        $var = $this->params['id'];
                        return $object->$action($var);
                    }
                    return $object->$action();
                }
            }
        }
        return false;
    }

    private function removeQueryStringVariable($url)
    {
        $parts = explode('&', $url);
        return $url = $parts[0];
    }

    private function convertToStudlyCaps($string)
    {
        return str_replace(' ', '', ucwords(str_replace('-', ' ', $string)));
    }

    private function getNamespace($controller)
    {
        return $namespace = 'App\Controllers\\' . $controller;
    }

    private function convertToCamelCaps($string)
    {
        return lcfirst($this->convertToStudlyCaps($string));
    }
}