<?php
/**
 * Handles request from the GridFieldBulkUpload component
 *
 * @author colymba
 * @package GridFieldBulkEditingTools
 * @subpackage BulkUpload
 */
class GridFieldBulkUpload_Request extends RequestHandler
{	
  /**
	 * Gridfield instance
	 * @var GridField 
	 */
	protected $gridField;
	

	/**
	 * Bulk upload component
	 * @var GridFieldBulkUpload
	 */
	protected $component;
	

	/**
	 * Gridfield Form controller
	 * @var Controller
	 */
	protected $controller;
	

	/**
	 * RequestHandler allowed actions
	 * @var array
	 */
	private static $allowed_actions = array(
		'upload', 'select', 'attach', 'fileexists'
	);


	/**
	 * RequestHandler url => action map
	 * @var array
	 */
	private static $url_handlers = array(
		'$Action!' => '$Action'
	);
	

	/**
	 * Handler's constructor
	 * 
	 * @param GridFIeld $gridField
	 * @param GridField_URLHandler $component
	 * @param Controller $controller
	 */
	public function __construct($gridField, $component, $controller)
	{
		$this->gridField = $gridField;
		$this->component = $component;
		$this->controller = $controller;		
		parent::__construct();
	}


	/**
	 * Return the original component's UploadField
	 * 
	 * @return UploadField UploadField instance as defined in the component
	 */
	public function getUploadField()
	{
		return $this->component->bulkUploadField($this->gridField);
	}

	
	/**
	 * Process upload through UploadField,
	 * creates new record and link newly uploaded file
	 * adds record to GrifField relation list
	 * and return image/file data and record edit form
	 *
	 * @param SS_HTTPRequest $request
	 * @return string json
	 */
	public function upload(SS_HTTPRequest $request)
	{
		//create record
		$recordClass = $this->gridField->list->dataClass;		
		$record = Object::create($recordClass);
		$record->write();

		// passes the current gridfield-instance to a call-back method on the new object
		$record->extend("onBulkFileUpload", $this->gridField);

		//get uploadField and process upload
		$uploadField = $this->getUploadField();
		$uploadField->setRecord($record);

    $fileRelationName = $uploadField->getName();
    $uploadResponse   = $uploadField->upload($request);

		//get uploaded File response datas
		$uploadResponse = Convert::json2array( $uploadResponse->getBody() );
		$uploadResponse = array_shift( $uploadResponse );
		
		// Attach the file to record.				
		$record->{"{$fileRelationName}ID"} = $uploadResponse['id'];					
		$record->write();

		// attached record to gridField relation
		$this->gridField->list->add($record->ID);
		
		// fetch uploadedFile record and sort out previewURL
		// update $uploadResponse datas in case changes happened onAfterWrite()
		$uploadedFile = DataObject::get_by_id( $this->component->getFileRelationClassName($this->gridField), $uploadResponse['id'] );
		if ( $uploadedFile )
		{
			$uploadResponse['name'] = $uploadedFile->Name;
			$uploadResponse['url'] = $uploadedFile->getURL();

			if ( $uploadedFile instanceof Image )
			{
				$uploadResponse['thumbnail_url'] = $uploadedFile->CroppedImage(30,30)->getURL();
			}
			else{
				$uploadResponse['thumbnail_url'] = $uploadedFile->Icon();
			}

			// check if our new record has a Title, if not create one automatically
			$title = $record->getTitle();
			if ( !$title || $title === $record->ID )
			{
				$title = basename($uploadedFile->getFilename());

				if ( $record->hasDatabaseField('Title') )
				{
					$record->Title = $title;
					$record->write();
				}
				else if ($record->hasDatabaseField('Name')){
					$record->Name = $title;
					$record->write();
				}
			}
		}

		// Collect all data for JS template
		$return = array_merge($uploadResponse, array(
			'record' => array(
				'id' => $record->ID
			)
		));
				
		$response = new SS_HTTPResponse(Convert::raw2json(array($return)));
		$response->addHeader('Content-Type', 'text/json');
		return $response;		
	}


	/**
	 * Pass select request to UploadField
	 * 
	 * @link UploadField->select()
	 */
	public function select(SS_HTTPRequest $request)
	{
		$uploadField = $this->getUploadField();
		return $uploadField->handleSelect($request);
	}


	/**
	 * Pass attach request to UploadField
	 * 
	 * @link UploadField->attach()
	 */
	public function attach(SS_HTTPRequest $request)
	{
		$uploadField = $this->getUploadField();
		return $uploadField->attach($request);
	}


	/**
	 * Pass fileexists request to UploadField
	 * 
	 * @link UploadField->fileexists()
	 */
	public function fileexists(SS_HTTPRequest $request)
	{
		$uploadField = $this->getUploadField();
		return $uploadField->fileexists($request);
	}

}