<?php
 
 namespace elanpl\L3;
 
 class Application{

     public $Config; // L3 Config object

     public $Request; // build from received HTTP request or created in L3 Config object

     public $Response; // response to be send
     public $Router; // routing engine
     public $Serialization; // serialization engine
     public $BaseDirectory; // directory root of the application
     public $ControllersDirectory; // subdirectory/namespace part added to controller class 
     public $ViewsDirectory; // subdirectory to search for the view files
     public $ApplicationDirectory; // subdirectory/namespace part of the application
     //public $Controller; //Active controller
     //public $Module; //Active module
     //public $Action; //Active action
 

     public function __construct($config){
         //set L3 application config
         $this->Config = $config;

         // directory root of the application
         $this->BaseDirectory = $config->getBaseDirectory();
         // subdirectory/namespace part added to controller class
         $this->ControllersDirectory = $config->getControllersDirectory();
         // subdirectory to search for the view files 
         $this->ViewsDirectory = $config->getViewsDirectory();
         // subdirectory/namespace part of the application
         $this->ApplicationDirectory = $config->getApplicationDirectory();

         //create request object

         $this->Request = $this->Config->getRequest();
         //create router object
         $this->Router = new Router($this->Config->getRouting());

         //create response objcet
         $this->Response = new Response();

         //create serialization object
         $this->Serialization = new Serialization(); 
     }
 
     public function basePath(){
         return strstr($_SERVER['REQUEST_URI'], $this->Request->Path, true);
     }
 
     public function relPath($file){
         return ($this->Router->depth>0 ? str_repeat("../", substr($this->Request->Path,-1)=='/'?$this->Router->depth:$this->Router->depth-1) : "" ).$file; 
     }
 
     public function link($name, $parameters){
         return $this->Router->link($name, $parameters);
     }
 
     /*
     //not need - PSR-4 autoload handles that
     function IncludeControler($Controller){
         include_once(_L3_CONTROLLER_PATH.$Controller.'.php');
     }*/
 
     public function FindControllerInCallStack($search_level=5){
         //search for controller, action and module if present
         $controller = "";
         $module = "";
         $action = "";
         $match = array();
 
         //analize the call stack
           $call_stack = debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, $search_level);
         
         for($i=0; $i<$search_level; $i++){
             if(preg_match(
                     $pattern = '#('.$this->ApplicationDirectory.')(\\\\(?P<module>.+))?\\\\'.$this->ControllersDirectory.'\\\\(?P<controller>.+)#',
                     $call_stack[$i]['class'],
                     $match
                 )
             ){
                 $action = $call_stack[$i]['function'];
                 $module = $match['module'];
                 $controller = $match['controller'];
                 break;
             }
         }
 
         return array(
             'module' => $module,
             'controller' => $controller,
             'action' => $action
         );
     }
 
     function RunControllerAction($ControllerAction, $Parameters){
         
         //prepare object and action name
         /*
         TODO ...
         if(is_object($this->controler) && (is_a($this->controler,'L2_controler') || is_subclass_of($this->controler,'L2_controler'))){
             if(is_string($this->action)){
                 $controler_object = $this->controler;
                 $controler_action = $this->action;
             }
         }
         else if(is_string($this->controler)){
             if(is_string($this->action)){
                 $this->includeControler($this->controler);
                 $controler_object = new $this->controler();
                 $controler_action = $this->action;
             }
         }*/
 
         if(is_array($ControllerAction)){
             //$this->IncludeControler($ControllerAction['controller']);
             $controller_class = "\\".$this->ApplicationDirectory."\\"
                 .(isset($ControllerAction['module'])?$ControllerAction['module']."\\":"")
                 .$this->ControllersDirectory."\\"
                 .$ControllerAction['controller'];
             $controller_object = new $controller_class;
             $controller_action = $ControllerAction['action'];
         }
 
         //fire the action
         if(isset($controller_object) && isset($controller_action)){
             $this->Module = (isset($ControllerAction['module'])?$ControllerAction['module']:"");
             $this->Controller = $ControllerAction['controller'];
             $this->Action = $controller_action;
             // prepare args and start the action
             if(!isset($reflection)){
                 $reflection = new \ReflectionMethod($controller_object, $controller_action);
             }
             if($reflection->getNumberOfParameters()){
                 $fire_args=array();
 
                 foreach($reflection->getParameters() AS $arg)
                 {
                     if(isset($Parameters[$arg->name]) || (is_array($ControllerAction) && isset($ControllerAction['defaults'][$arg->name])))
                         if(isset($Parameters[$arg->name]))
                             $fire_args[$arg->name]=$Parameters[$arg->name];
                         else
                             $fire_args[$arg->name]=$ControllerAction['defaults'][$arg->name];
                     else
                     {
                         if($arg->isDefaultValueAvailable()){
                             $fire_args[$arg->name]=$arg->getDefaultValue();
                         }
                         else{
                             $fire_args[$arg->name]=null;
                         }
                     }
                 }
                 return $reflection->invokeArgs ($controller_object , $fire_args );
             }
             else{
                 return $reflection->invoke($controller_object);
             }
         }
     }
 
     public function HandleActionResult($result){
         if(is_string($result)){
             $content = $result;
         }
         else if(is_object($result)){
             if($result instanceof ViewModel){
                 if($SerializationContentType = $this->Serialization->Match($this->Request->AcceptTypes, $result)){
                     $content = $this->Serialization->Serialize($SerializationContentType, $result);
                     if(is_object($content)){
                         if($content instanceof Response){
                             $this->Response = $content;
                             unset($content);
                         }
                     }
                 }
                 else{
                     echo "Serializer not defined for Content-Type: ".$this->Request->Accept."<br>".PHP_EOL;
                     throw new \Exception("Not implemented!");
                 }
             }
             else if($result instanceof View){
                 $content = $result->render();
             }
             else if($result instanceof Response){
                 $this->Response = $result;
             }  
         }
         if(isset($content))
                 $this->Response->withBody($content);
         $this->Response->send();
     }
 
     public function BeforeAction(){
         if(!empty($this->Router->RouteInfo->BeforeAction)){
             foreach($this->Router->RouteInfo->BeforeAction as $event_handler){
                 $this->Router->RouteInfo::EventHandlerFormatCheck($event_handler, $eh);
                 if(isset($eh['class'])){
                     $object = new $eh['class'];
                     $reflection = new \ReflectionMethod($object, $eh['function']);
                     $fire_args = array();
                     $fire_args[] = $this->Request;
                     $fire_args[] = $this->Router->RouteInfo;
                     if(isset($eh['arguments'])){
                         $this->Router->RouteInfo::EventHandlerArgumentsFormatCheck($eh['arguments'], $args);
                         $fire_args = array_merge($fire_args, $args);
                     }
                     $result = $reflection->invokeArgs ($object , $fire_args );
                 }
                 else if (is_callable($eh['function'])){
                     throw new \Exception("Not implemented!");
                 }
                 if(isset($result)){
                     if(is_object($result)){
                         if($result instanceof Response){
                             $this->HandleActionResult($result);
                             exit();
                         }
                     }
                 }
             }
         }
     }
 
     public function Run(){
         // Check if routing path is found
         if($action = $this->Router->match($this->Request)){
             // routing match found decide what to do next...
             // BeforeAction event
             $this->BeforeAction();
 
             // function -> call it...
             if(is_callable($action)){
                 $reflection = new \ReflectionFunction($action);
                 if($reflection->getNumberOfParameters()){
                     $fire_args=array();
       
                     foreach($reflection->getParameters() AS $arg)
                     {
                         if(isset($this->Router->parsedParameters[$arg->name]))
                             $fire_args[$arg->name]=$this->Router->parsedParameters[$arg->name];
                         else
                             $fire_args[$arg->name]=null;
                     }
                     
                     $result = call_user_func_array($action, $fire_args);
                 }
                 else{
                     $result = call_user_func($action);
                 }
             }
             else if(is_object($action) && is_a($action, 'L2_controler_info')){
                 // not implemented yet.
                 throw new \Exception("Not implemented!");
                 ///$action->runControlerAction($this->routing->param);
             }
             // array with controller, and action -> run the controller action
             else if(is_array($action) && array_key_exists('controller',$action) && array_key_exists('action', $action)){
                 $result = $this->RunControllerAction($action, $this->Router->parsedParameters);
                 
             }
             // string
             else if(is_string($action)){
                 $result = $action;
             }
 
             // Handle the action result
             if(isset($result)){
                 $this->HandleActionResult($result);
             }
         }
         // routing path not found -> generate 404 response
         else{
             echo "Routing not found!<br>".PHP_EOL;
             throw new \Exception("Not implemented!");
         }
  
     }
 }