<?php

namespace APIJet;

class APIJet

{

const fileExt = '.php';

// List of configurable settings name.

const DEFAULT_RESPONSE_LIMIT = 0;

const AUTHORIZATION_CALLBACK = 1;

private $singletonContainer;

private static $defaultConfig =

[

'APIJet' => [

self::DEFAULT_RESPONSE_LIMIT => 25,

self::AUTHORIZATION_CALLBACK => null,

]

];

public function __construct(array $userConfig = [], array $containers = [])

{

if (!isset($containers['Config'])) {

$containers['Config'] = new Config();

}

$config = $containers['Config'];

$config->set(self::$defaultConfig);

$config->set($userConfig);

$this->singletonContainer = $containers;

}

public static function registerAutoload()

{

spl_autoload_register(__NAMESPACE__ . "\\APIJet::autoload");

}

/**

* @desc PSR-0

* @link http://www.php-fig.org/psr/psr-0/

*/

public static function autoload($className)

{

$className = ltrim($className, '\\');

$fileName = '';

$namespace = '';

if ($lastNsPos = strrpos($className, '\\')) {

$namespace = substr($className, 0, $lastNsPos);

$className = substr($className, $lastNsPos + 1);

$fileName = str_replace('\\', DIRECTORY_SEPARATOR, $namespace) . DIRECTORY_SEPARATOR;

}

$fileName .= str_replace('_', DIRECTORY_SEPARATOR, $className) . self::fileExt;

// Original PSR-0

// require $fileName;

// Adapted

require '../'.$fileName;

}

public function getSingletonContainer($name)

{

if (isset($this->singletonContainer[$name])) {

$instance = $this->singletonContainer[$name];

if ($instance instanceof \Closure) {

$this->singletonContainer[$name] = $instance();

}

return $this->singletonContainer[$name];

}

trigger_error('Singleton container with '.$name.' does not exist', E_USER_ERROR);

}

public function setSingletonContainer($name, $instance)

{

$this->singletonContainer[$name] = $instance;

}

/**

* @return Router

*/

public function getRouterContainer()

{

return $this->getSingletonContainer('Router');

}

/**

* @return Config

*/

public function getConfigContainer()

{

return $this->getSingletonContainer('Config');

}

/**

* @return Request

*/

public function getRequestContainer()

{

return $this->getSingletonContainer('Request');

}

/**

* @return Response

*/

public function getResponseContainer()

{

return $this->getSingletonContainer('Response');

}

/**

* @desc Initialize basic container excluding config

*/

private function initBaseContainers($containers)

{

$config = $this->getConfigContainer();

$APIJetConfig = $config->get('APIJet');

$routerConfig = $config->get('Router');

if (!isset($containers['Router'])) {

$containers['Router'] = new Router();

}

$routerContainer = $containers['Router'];

$routerContainer->setRoutes($routerConfig['routes']);

$routerContainer->setGlobalPattern($routerConfig['globalPattern']);

if (!isset($containers['Request'])) {

$containers['Request'] = new Request();

}

$requestContainer = $containers['Request'];

$requestContainer->setAuthorizationCallback($APIJetConfig[self::AUTHORIZATION_CALLBACK]);

$requestContainer->setDefaultResponseLimit($APIJetConfig[self::DEFAULT_RESPONSE_LIMIT]);

if (!isset($containers['Response'])) {

$containers['Response'] = new Response();

}

$this->singletonContainer = $containers + $this->singletonContainer;

}

public function run($containers = [])

{

$this->initBaseContainers($containers);

$request = $this->getRequestContainer();

$response = $this->getResponseContainer();

if (!$request->isАuthorized()) {

$response->setCode(401);

return;

}

$router = $this->getRouterContainer();

if (!$router->getMatchedRouterResource($request::getMethod(), $request::getCleanRequestUrl())) {

$response->setCode(404);

} else {

try {

$actionResponse = $this->executeResoruceAction(

$router->getMatchedController(),

$router->getMatchedAction(),

$router->getMatchedRouteParameters()

);

if ($actionResponse === false) {

$response->setCode(404);

} else {

$response->setBody($actionResponse);

}

} catch(\APIJet\CustomException $e) {

$response->setCode($e->getHttpCode());

$response->setBody($e->getErrorBody());

} catch(\Exception $e) {

$response->setCode(500);

}

}

$response->render();

}

/**

* @return response of executed action or false in case it doesn't exist

* @param string $controller

* @param string $action

* @param string $parameters

*/

private function executeResoruceAction($controller, $action, $parameters)

{

$controller = ucfirst($controller);

$action = strtolower($this->getRequestContainer()->getMethod()).'_'.$action;

$controller = 'Controllers\\'.$controller;

// Check if class exist

if (!class_exists($controller)) {

return false;

}

$controllerInstance = new $controller($this);

// Check if action exist

if (!method_exists($controllerInstance, $action)) {

return false;

}

// Check if it's a callable method

if (!is_callable([$controllerInstance, $action])) {

return false;

}

return (array) call_user_func_array(array($controllerInstance, $action), $parameters);

}

}