<?php
//
//namespace Combodo\iTop\Forms\Dependency;
//
//use Exception;
//use Symfony\Component\Form\Event\PostSetDataEvent;
//use Symfony\Component\Form\Event\PostSubmitEvent;
//use Symfony\Component\Form\FormBuilderInterface;
//use Symfony\Component\Form\FormEvent;
//use Symfony\Component\Form\FormEvents;
//use Symfony\Component\Form\FormInterface;
//
//class DependencyHandler
//{
//	/** @var array dépendencies descriptions stored on builder add */
//	private array $aDependenciesDescription = [];
//
//	/** @var array dependencies map computed on form pre set data */
//	private array $aDependenciesMap = [];
//
//	/**
//	 * Constructor.
//	 *
//	 * @param FormBuilderInterface $builder
//	 */
//	public function __construct(public FormBuilderInterface $builder)
//	{
//		// Initialize the dependencies listeners once the form is built
//		$builder->addEventListener(FormEvents::PRE_SET_DATA, function (FormEvent $event) {
//			$oForm = $event->getForm();
//			$this->InitializeDependenciesMap($oForm);
//		});
//	}
//
//	/**
//	 *Initialize the dependencies map and register listeners on the dependencies inputs.
//	 *
//	 * @param FormInterface $oForm
//	 *
//	 * @return void
//	 */
//	private function InitializeDependenciesMap(FormInterface $oForm): void
//	{
//
//		/** iterate throw dependencies descriptions... @var DependencyDescription $oDependencyDescription */
//		foreach ($this->aDependenciesDescription as $oDependencyDescription) {
//
//			/** iterate throw dependencies items... */
//			foreach ($oDependencyDescription->aDependencies as $sInput => $aData) {
//
//				// get the dependency field name
//				$sDependency = $aData['source'];
//
//				// get the field input name
//				$sOutput = array_key_exists('output', $aData) ? $aData['output'] : null;
//
//				// add the dependency to the map
//				if(!array_key_exists($sDependency, $this->aDependenciesMap)){
//					$this->aDependenciesMap[$sDependency] = [];
//				}
//				$this->aDependenciesMap[$sDependency][] = ['description' => $oDependencyDescription, 'input' => $sInput, 'output' => $sOutput];
//			}
//		}
//
//		/** iterate throw dependencies... */
//		foreach (array_keys($this->aDependenciesMap) as $sDependency){
//
//			// Listen the dependency
//			$this->builder->get($sDependency)->addEventListener(FormEvents::POST_SET_DATA, $this->GetEventListeningCallback());
//			$this->builder->get($sDependency)->addEventListener(FormEvents::POST_SUBMIT, $this->GetEventListeningCallback());
//		}
//
//	}
//
//	/**
//	 * Add a dependency description.
//	 *
//	 * @param DependencyDescription $oDependencyDescription
//	 *
//	 * @return void
//	 */
//	public function AddDependencyDescription(DependencyDescription $oDependencyDescription): void
//	{
//		$this->aDependenciesDescription[] = $oDependencyDescription;
//	}
//
//	/**
//	 * The event handling callback.
//	 *
//	 * @return callable
//	 */
//	private function GetEventListeningCallback(): callable
//	{
//		return function (FormEvent $event){
//
//			// Get the event type
//			$sEventType = $this->GetEventType($event);
//
//			// Get the form
//			$oForm = $event->getForm();
//
//			/** Iterate throw dependencies map... */
//			foreach ($this->aDependenciesMap[$event->getForm()->getName()] as $aData){
//
//				// Get the map data
//				$oDependencyDescription = $aData['description'];
//				$sInput = $aData['input'];
//				$sOutput = $aData['output'];
//
//				// Compute output value
//				$oValue = $event->getData();
//				if(array_key_exists('outputs', $event->getForm()->getConfig()->getOptions())){
//					$aOutputs = $event->getForm()->getConfig()->getOptions()['outputs'];
//					if(array_key_exists($sOutput, $aOutputs)){
//						$oValue = $aOutputs[$sOutput]($oValue);
//					}
//				}
//
//				// Store the input value
//				$oDependencyDescription->SetData($sEventType, $sInput, $oValue);
//
//				// When dependencies met, add the dependent field if not already done
//				if(!$oDependencyDescription->IsAdded() && $oDependencyDescription->IsDataReady($sEventType)) {
//
//					// Get the dependent field options
//					$aOptions = $oDependencyDescription->options;
//
//					// Add the listener callback to the dependent field if it is also a dependency for another field
//					if(is_string($oDependencyDescription->child) && array_key_exists($oDependencyDescription->child, $this->aDependenciesMap)) {
//						$aOptions = array_merge($aOptions, [
//							'listener_callback' => $this->GetEventListeningCallback(),
//						]);
//					}
//
//					// Add the dependent field to the form
//					$oForm->getParent()->add($oDependencyDescription->child, $oDependencyDescription->type, array_merge($aOptions, $oDependencyDescription->type::GetOptionsFromInputs($oDependencyDescription->GetData($sEventType))));
//
//					// Mark the dependency as added
//					$oDependencyDescription->SetAdded(true);
//				}
//			}
//
//		};
//
//	}
//
//	/**
//	 * Get the event type.
//	 *
//	 * @param FormEvent $event
//	 *
//	 * @return string
//	 * @throws Exception
//	 */
//	private function GetEventType(FormEvent $event): string
//	{
//		if($event instanceof PostSetDataEvent) {
//			return FormEvents::POST_SET_DATA;
//		}
//		else if($event instanceof PostSubmitEvent) {
//			return FormEvents::POST_SUBMIT;
//		}
//
//		throw new Exception(sprintf("Unknown event type %s", get_class($event)));
//	}
//
//
//
//
//
//
//}