<?php
/**
 * TActiveFileUpload.php
 * 
 * @author Bradley Booms <Bradley.Booms@nsighttel.com>
 * @author Christophe Boulain <Christophe.Boulain@gmail.com>
 * @version $Id$
 */

/**
 * Load TActiveControlAdapter and TFileUpload.
 */
Prado::using('System.Web.UI.ActiveControls.TActiveControlAdapter');
Prado::using('System.Web.UI.WebControls.TFileUpload');

/**
 * TActiveFileUpload
 * 
 * TActiveFileUpload displays a file upload field on a page. Upon postback,
 * the text entered into the field will be treated as the name of the file
 * that will be uploaded to the server. The property {@link getHasFile HasFile}
 * indicates whether the file upload is successful. If successful, the file
 * may be obtained by calling {@link saveAs} to save it at a specified place.
 * You can use {@link getFileName FileName}, {@link getFileType FileType},
 * {@link getFileSize FileSize} to get the original client-side file name,
 * the file mime type, and the file size information. If the upload is not
 * successful, {@link getErrorCode ErrorCode} contains the error code
 * describing the cause of failure.
 *
 * TActiveFileUpload raises {@link onFileUpload OnFileUpload} event if a file is uploaded
 * (whether it succeeds or not).
 * 
 * TActiveFileUpload actually does a postback in a hidden IFrame, and then does a callback.
 * This callback then raises the {@link onFileUpload OnFileUpload} event. After the postback
 * a status icon is displayed; either a green checkmark if the upload is successful,
 * or a red x if there was an error.
 *  
 * @author Bradley Booms <Bradley.Booms@nsighttel.com>
 * @author Christophe Boulain <Christophe.Boulain@gmail.com>
 * 
 * @version $Id$
 */
class TActiveFileUpload extends TFileUpload implements IActiveControl, ICallbackEventHandler, INamingContainer 
{
	
	const SCRIPT_PATH = 'prado/activefileupload';
	
	/**
	 * @var THiddenField a flag to tell which component is doing the callback.
	 */
	private $_flag;
	/**
	 * @var TImage that spins to show that the file is being uploaded.
	 */
	private $_busy;
	/**
	 * @var TImage that shows a green check mark for completed upload.
	 */
	private $_success;
	/**
	 * @var TImage that shows a red X for incomplete upload.
	 */
	private $_error;
	/**
	 * @var TInlineFrame used to submit the data in an "asynchronous" fashion.
	 */
	private $_target;

	
	/**
	 * Creates a new callback control, sets the adapter to
	 * TActiveControlAdapter. If you override this class, be sure to set the
	 * adapter appropriately by, for example, by calling this constructor.
	 */
	public function __construct(){
		parent::__construct();
		$this->setAdapter(new TActiveControlAdapter($this));
	}
	
	
	/**
	 * @param string asset file in the self::SCRIPT_PATH directory.
	 * @return string asset file url.
	 */
	protected function getAssetUrl($file='')
	{
		$base = $this->getPage()->getClientScript()->getPradoScriptAssetUrl();
		return $base.'/'.self::SCRIPT_PATH.'/'.$file;
	}
	
	
	/**
	 * This method is invoked when a file is uploaded.
	 * If you override this method, be sure to call the parent implementation to ensure
	 * the invocation of the attached event handlers.
	 * @param TEventParameter event parameter to be passed to the event handlers
	 */
	public function onFileUpload($param){
		if ($this->_flag->getValue() && $this->getPage()->getIsPostBack()){
			// save the file so that it will persist past the end of this return.
			$localName = str_replace('\\', '/', tempnam(Prado::getPathOfNamespace($this->getTempPath()),''));
			parent::saveAs($localName);
			
			$filename=addslashes($this->getFileName());
			// return some javascript to display a completion status.
			echo <<<EOS
<script language="Javascript">
	Options = new Object();
	Options.clientID = '{$this->getClientID()}';
	Options.targetID = '{$this->_target->getUniqueID()}';
	Options.localName = '$localName';
	Options.fileName = '{$filename}';
	Options.fileSize = '{$this->getFileSize()}';
	Options.fileType = '{$this->getFileType()}';
	Options.errorCode = '{$this->getErrorCode()}';
	parent.Prado.WebUI.TActiveFileUpload.onFileUpload(Options);
</script>
EOS;
			exit();
		}
	}
	
	/**
	 * @return string the path where the uploaded file will be stored temporarily, in namespace format
	 * default "Application.runtime.*"
	 */
	public function getTempPath(){
		return $this->getViewState('TempPath', 'Application.runtime.*');
	}
	
	/**
	 * @param string the path where the uploaded file will be stored temporarily in namespace format
	 * default "Application.runtime.*"
	 */
	public function setTempPath($value){
		$this->setViewState('TempNamespace',$value,'Application.runtime.*');
	}
	
	/**
	 * @throws TInvalidDataValueException if the {@link getTempPath TempPath} is not writable.
	 */
	public function onInit($sender){
		parent::onInit($sender);
		if (!is_writable(Prado::getPathOfNamespace($this->getTempPath()))){
			throw new TInvalidDataValueException("activefileupload_temppath_invalid", $this->getTempPath());
		}
	}
	
	/**
	 * Raises <b>OnFileUpload</b> event.
	 * 
	 * This method is required by {@link ICallbackEventHandler} interface. 
	 * This method is mainly used by framework and control developers.
	 * @param TCallbackEventParameter the event parameter
	 */
 	public function raiseCallbackEvent($param){
 		$cp = $param->getCallbackParameter();
		if ($key = $cp->targetID == $this->_target->getUniqueID()){
			$_FILES[$key]['name'] = $cp->fileName;
			$_FILES[$key]['size'] = intval($cp->fileSize);
			$_FILES[$key]['type'] = $cp->fileType;
			$_FILES[$key]['error'] = intval($cp->errorCode);
			$_FILES[$key]['tmp_name'] = $cp->localName;
			$this->loadPostData($key, null);
			
			$this->raiseEvent('OnFileUpload', $this, $param);
		}
	}

	/**
	 * Publish the javascript
	 */
	public function onPreRender($param){
		parent::onPreRender($param);
		$this->getPage()->getClientScript()->registerPradoScript('activefileupload');
	}
	
	
	public function createChildControls(){
		$this->_flag = Prado::createComponent('THiddenField');
		$this->_flag->setID('Flag');
		$this->getControls()->add($this->_flag);
		
		$this->_busy = Prado::createComponent('TImage');
		$this->_busy->setID('Busy');
		$this->_busy->setImageUrl($this->getAssetUrl('ActiveFileUploadIndicator.gif'));
		$this->_busy->setStyle("display:none");
		$this->getControls()->add($this->_busy);
		
		$this->_success = Prado::createComponent('TImage');
		$this->_success->setID('Success');
		$this->_success->setImageUrl($this->getAssetUrl('ActiveFileUploadComplete.png'));
		$this->_success->setStyle("display:none");
		$this->getControls()->add($this->_success);
		
		$this->_error = Prado::createComponent('TImage');
		$this->_error->setID('Error');
		$this->_error->setImageUrl($this->getAssetUrl('ActiveFileUploadError.png'));
		$this->_error->setStyle("display:none");
		$this->getControls()->add($this->_error);
		
		$this->_target = Prado::createComponent('TInlineFrame');
		$this->_target->setID('Target');
		$this->_target->setFrameUrl($this->getAssetUrl('ActiveFileUploadBlank.html'));
		$this->_target->setStyle("width:0px; height:0px;");
		$this->_target->setShowBorder(false);
		$this->getControls()->add($this->_target);
	}
	
	
	/**
	 * Removes localfile on ending of the callback.  
	 */
	public function onUnload($param){
		if ($this->getPage()->getIsCallback() && 
			$this->getHasFile() && 
			file_exists($this->getLocalName())){
				unlink($this->getLocalName());
		}
		parent::onUnload($param);
	}

	/**
	 * @return TBaseActiveCallbackControl standard callback control options.
	 */
	public function getActiveControl(){
		return $this->getAdapter()->getBaseActiveControl();
	}

	/**
	 * Adds ID attribute, and renders the javascript for active component.
	 * @param THtmlWriter the writer used for the rendering purpose
	 */
	public function addAttributesToRender($writer){
		parent::addAttributesToRender($writer);
		$writer->addAttribute('id',$this->getClientID());
		
		$this->getActiveControl()->registerCallbackClientScript($this->getClientClassName(),$this->getClientOptions());
	}

	/**
	 * @return string corresponding javascript class name for this control.
	 */
	protected function getClientClassName(){
		return 'Prado.WebUI.TActiveFileUpload';
	}

	/**
	 * Gets the client side options for this control.
	 * @return array (	inputID => input client ID,
	 * 					flagID => flag client ID,
	 * 					targetName => target unique ID,
	 * 					formID => form client ID,
	 * 					indicatorID => upload indicator client ID,
	 * 					completeID => complete client ID,
	 * 					errorID => error client ID)
	 */
	protected function getClientOptions(){
		$options['ID'] = $this->getClientID();
		$options['EventTarget'] = $this->getUniqueID();
		
		$options['inputID'] = $this->getClientID();
		$options['flagID'] = $this->_flag->getClientID();
		$options['targetID'] = $this->_target->getUniqueID();
		$options['formID'] = $this->getPage()->getForm()->getClientID();
		$options['indicatorID'] = $this->_busy->getClientID();
		$options['completeID'] = $this->_success->getClientID();
		$options['errorID'] = $this->_error->getClientID();
		return $options;
	}

	/**
	 * Saves the uploaded file.
	 * @param string the file name used to save the uploaded file
	 * @param boolean whether to delete the temporary file after saving.
	 * If true, you will not be able to save the uploaded file again.
	 * @return boolean true if the file saving is successful
	 */
	public function saveAs($fileName,$deleteTempFile=true){
		if (($this->getErrorCode()===UPLOAD_ERR_OK) && (file_exists($this->getLocalName()))){
			if ($deleteTempFile)
				return rename($this->getLocalName(),$fileName);
			else
				return copy($this->getLocalName(),$fileName);
		} else
			return false;
	}

	/**
	 * @return TImage the image displayed when an upload 
	 * 		completes successfully.
	 */
	public function getSuccessImage(){
		$this->ensureChildControls();
		return $this->_success;
	}
	
	/**
	 * @return TImage the image displayed when an upload 
	 * 		does not complete successfully.
	 */
	public function getErrorImage(){
		$this->ensureChildControls();
		return $this->_error;
	}
	
	/**
	 * @return TImage the image displayed when an upload 
	 * 		is in progress.
	 */
	public function getBusyImage(){
		$this->ensureChildControls();
		return $this->_busy;
	}
}