<?php
/*
   Dieses Skript analysiert die URL und generiert daraus die passenden Controller-Aufrufe 
   
   Für die Beispiel-URL 
   
   https://username.web.pb.bib.de/restAPI.php/aufgabe/3
   
   liefert 
   
   $_SERVER['PATH_INFO'] den URL-Abschnitt  "aufgabe/3"
   
   und 
   
   file_get_contents('php://input') die übergebenen json-Strings (für PUT/POST-Requests) 
*/
spl_autoload_register(function ($className) {
    if (substr($className, 0, 4) !== 'ppb\\') {
        return;
    }

    $fileName = __DIR__ . '/' . str_replace('\\', DIRECTORY_SEPARATOR, substr($className, 4)) . '.php';

    if (file_exists($fileName)) {
        include $fileName;
    }
});

$endpoint = explode('/', trim($_SERVER['PATH_INFO'], '/'));
$data = json_decode(file_get_contents('php://input'), true);

$controllerName = $endpoint[0];
$endpoint2 = isset($endpoint[1]) ? $endpoint[1] : false;
$id = false;
$alias = false;

if ($endpoint2) {
    if (preg_match('/^[0-9]+$/', $endpoint2)) {
        $id = $endpoint2;
    } else {
        $alias = $endpoint2;
    }
}

$controllerClassName = 'ppb\\Controller\\' . ucfirst($controllerName) . 'Controller';

if ($_SERVER['REQUEST_METHOD'] == "DELETE") {
    $methodName = "delete" . ucfirst($controllerName);
} else if ($_SERVER['REQUEST_METHOD'] == "PUT") {
    $methodName = "update" . ucfirst($controllerName);
} else if ($_SERVER['REQUEST_METHOD'] == "POST") {
    $methodName = "write" . ucfirst($controllerName);
} else if ($_SERVER['REQUEST_METHOD'] == "GET") {
    if ($alias) {
        $methodName = $alias;
    } else {
        $methodName = "get" . ucfirst($controllerName);
    }
}

if (method_exists($controllerClassName, $methodName)) {

    header('Content-Type: application/json');

    $controller = new $controllerClassName();
    //GET
    if ($_SERVER['REQUEST_METHOD'] == "GET") {

        echo $controller->$methodName($id);

    } else
        //POST	
        if ($_SERVER['REQUEST_METHOD'] == "POST") {
            echo $controller->$methodName($data);
        } else
            //DELETE	
            if ($_SERVER['REQUEST_METHOD'] == "DELETE") {
                echo $controller->$methodName($id);
            } else
            //PUT
            {
                echo $controller->$methodName($id, $data);
            }
} else {
    //http_response_code(404);
    new \ppb\Library\Msg(true, 'Page not found: ' . $controllerClassName . '::' . $methodName);

}
?>