<?php

/**
 * Route the page to a controller.
 * Use the following syntax /{{namespace}}/{{controller}}/{{function}}
 * 
 * TODO: handle non-get request
 */
class Router {
    public $namespace;
    public $controller;
    public $func;
    public $characterId = -1;


    private $namespaces = [];
    private $currentNamespaceHandler;

    // List of forbidden route, to avoid calling private or other REST verbs
    private $forbiddenRoutes = [ '__', '_post', '_delete', '_put', '_patch'];


    public function registerNamespace($name, $authLevel, $haveCharacterId) {
        $this->namespaces[$name] = new NamespaceHandler($name, $authLevel, $haveCharacterId);
    }

    public function loadController() {
        global $renderer;
        $this->parseUrl();
        if (!$this->currentNamespaceHandler->canShow()) {
            $renderer->error(403);
        }
        $controllerFile = $this->getControllerPath();
        require_once $controllerFile;

        $func = $this->func;
        if (isset($_POST["submit"])) {
            $func = $func."_post";
        }

        if (is_callable($func)) {
            call_user_func($func);
        } else {
            $renderer->error(404);
        }
    }

    private function getFromUrl($requestParts, $index, $default) {
        return (isset($requestParts[$index]) && $requestParts[$index] != null) ? $requestParts[$index] : $default;
    }

    private function parseUrl() {
        global $renderer;
        $requestUri = trim($_SERVER['REQUEST_URI'], '/');
        $requestParts = explode('/', $requestUri);

        $this->namespace = $this->getFromUrl($requestParts, 0, 'site');
        if (!isset($this->namespaces[$this->namespace])) {
            $renderer->error(404);
        }

        $this->currentNamespaceHandler = $this->namespaces[$this->namespace];

        if ($this->currentNamespaceHandler->haveCharacterId) {
            $this->characterId = $this->getFromUrl($requestParts, 1, -1);
            $this->controller = $this->getFromUrl($requestParts, 2, "pages");
            $this->func = $this->getFromUrl($requestParts, 3, "index");
        } else {
            $this->controller = $this->getFromUrl($requestParts, 1, "pages");
            $this->func = $this->getFromUrl($requestParts, 2, "index");
        }

        foreach ($this->forbiddenRoutes as $forbiddenRoute) {
            if (str_contains($this->func, $forbiddenRoute)) {
                $renderer->error(500);
            }
        }
    }

    private function getControllerPath() {
        global $renderer;
        $controllerPath = PATH_ROOT . "controllers/{$this->namespace}/{$this->controller}.php";
        if (!file_exists($controllerPath)) {
            $renderer->error(404);
        }
        return $controllerPath;
    }
}