<?php
/**
 * TTextBox class file.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @link http://www.pradosoft.com/
 * @copyright Copyright &copy; 2005-2014 PradoSoft
 * @license http://www.pradosoft.com/license/
 * @package Prado\Web\UI\WebControls
 */

namespace Prado\Web\UI\WebControls;
use Prado\TPropertyValue;
use Prado\Web\THttpUtility;
use Prado\Exceptions\TInvalidDataValueException;

/**
 * TTextBox class
 *
 * TTextBox displays a text box on the Web page for user input.
 * The text displayed in the TTextBox control is determined by the
 * {@link setText Text} property. You can create a <b>SingleLine</b>,
 * a <b>MultiLine</b>, or a <b>Password</b> text box by setting
 * the {@link setTextMode TextMode} property. If the TTextBox control
 * is a multiline text box, the number of rows it displays is determined
 * by the {@link setRows Rows} property, and the {@link setWrap Wrap} property
 * can be used to determine whether to wrap the text in the component.
 *
 * To specify the display width of the text box, in characters, set
 * the {@link setColumns Columns} property. To prevent the text displayed
 * in the component from being modified, set the {@link setReadOnly ReadOnly}
 * property to true. If you want to limit the user input to a specified number
 * of characters, set the {@link setMaxLength MaxLength} property.
 * To use AutoComplete feature, set the {@link setAutoCompleteType AutoCompleteType} property.
 *
 * If {@link setAutoPostBack AutoPostBack} is set true, updating the text box
 * and then changing the focus out of it will cause postback action.
 * And if {@link setCausesValidation CausesValidation} is true, validation will
 * also be processed, which can be further restricted within
 * a {@link setValidationGroup ValidationGroup}.
 *
 * WARNING: Be careful if you want to display the text collected via TTextBox.
 * Malicious cross-site script may be injected in. You may use {@link getSafeText SafeText}
 * to prevent this problem.
 *
 * NOTE: If you set {@link setWrap Wrap} to false or use {@link setAutoCompleteType AutoCompleteType},
 * the generated HTML output for the textbox will not be XHTML-compatible.
 * Currently, no alternatives are available.
 *
 * @author Qiang Xue <qiang.xue@gmail.com>
 * @package Prado\Web\UI\WebControls
 * @since 3.0
 */
class TTextBox extends \Prado\Web\UI\WebControls\TWebControl implements \Prado\Web\UI\IPostBackDataHandler, \Prado\Web\UI\IValidatable, \Prado\IDataRenderer
{
	/**
	 * Default number of rows (for MultiLine text box)
	 */
	const DEFAULT_ROWS=4;
	/**
	 * Default number of columns (for MultiLine text box)
	 */
	const DEFAULT_COLUMNS=20;
	/**
	 * @var mixed safe text parser
	 */
	private static $_safeTextParser=null;
	/**
	 * @var string safe textbox content with javascript stripped off
	 */
	private $_safeText;
	private $_dataChanged=false;
	private $_isValid=true;

	/**
	 * @return string tag name of the textbox
	 */
	protected function getTagName()
	{
		return ($this->getTextMode()==='MultiLine')?'textarea':'input';
	}

	/**
	 * @return boolean whether to render javascript.
	 */
	public function getEnableClientScript()
	{
		return $this->getViewState('EnableClientScript',true);
	}

	/**
	 * @param boolean whether to render javascript.
	 */
	public function setEnableClientScript($value)
	{
		$this->setViewState('EnableClientScript',TPropertyValue::ensureBoolean($value),true);
	}

	/**
	 * Adds attribute name-value pairs to renderer.
	 * This method overrides the parent implementation with additional textbox specific attributes.
	 * @param THtmlWriter the writer used for the rendering purpose
	 */
	protected function addAttributesToRender($writer)
	{
		$page=$this->getPage();
		$page->ensureRenderInForm($this);
		if(($uid=$this->getUniqueID())!=='')
			$writer->addAttribute('name',$uid);
		if(($textMode=$this->getTextMode())===TTextBoxMode::MultiLine)
		{
			if(($rows=$this->getRows())<=0)
				$rows=self::DEFAULT_ROWS;
			if(($cols=$this->getColumns())<=0)
				$cols=self::DEFAULT_COLUMNS;
			$writer->addAttribute('rows',"$rows");
			$writer->addAttribute('cols',"$cols");
			if(!$this->getWrap())
				$writer->addAttribute('wrap','off');
		}
		else
		{
			if($textMode===TTextBoxMode::SingleLine)
			{
				$writer->addAttribute('type','text');
				if(($text=$this->getText())!=='')
					$writer->addAttribute('value',$text);
			}
			else
			{
				if($this->getPersistPassword() && ($text=$this->getText())!=='')
					$writer->addAttribute('value',$text);
				$writer->addAttribute('type','password');
			}

			if(($act=$this->getAutoCompleteType())!=='None')
			{
				if($act==='Disabled')
					$writer->addAttribute('autocomplete','off');
				else if($act==='Search')
					$writer->addAttribute('vcard_name','search');
				else if($act==='HomeCountryRegion')
					$writer->addAttribute('vcard_name','HomeCountry');
				else if($act==='BusinessCountryRegion')
					$writer->addAttribute('vcard_name','BusinessCountry');
				else
				{
					if(strpos($act,'Business')===0)
						$act='Business'.'.'.substr($act,8);
					else if(strpos($act,'Home')===0)
						$act='Home'.'.'.substr($act,4);
					$writer->addAttribute('vcard_name','vCard.'.$act);
				}
			}

			if(($cols=$this->getColumns())>0)
				$writer->addAttribute('size',"$cols");
			if(($maxLength=$this->getMaxLength())>0)
				$writer->addAttribute('maxlength',"$maxLength");
		}
		if($this->getReadOnly())
			$writer->addAttribute('readonly','readonly');
		$isEnabled=$this->getEnabled(true);
		if(!$isEnabled && $this->getEnabled())  // in this case parent will not render 'disabled'
			$writer->addAttribute('disabled','disabled');
		if($isEnabled
			&& $this->getEnableClientScript()
			&& ( $this->getAutoPostBack() || $textMode===TTextBoxMode::SingleLine)
			&& $page->getClientSupportsJavaScript())
		{
			$this->renderClientControlScript($writer);
		}
		parent::addAttributesToRender($writer);
	}

	/**
	 * Renders the javascript for textbox.
	 */
	protected function renderClientControlScript($writer)
	{
		$writer->addAttribute('id',$this->getClientID());
		$cs = $this->getPage()->getClientScript();
		$cs->registerPostBackControl($this->getClientClassName(),$this->getPostBackOptions());
	}

	/**
	 * Gets the name of the javascript class responsible for performing postback for this control.
	 * This method overrides the parent implementation.
	 * @return string the javascript class name
	 */
	protected function getClientClassName()
	{
		return 'Prado.WebUI.TTextBox';
	}

	/**
	 * Gets the post back options for this textbox.
	 * @return array
	 */
	protected function getPostBackOptions()
	{
		$options['ID'] = $this->getClientID();
		$options['EventTarget'] = $this->getUniqueID();
		$options['AutoPostBack'] = $this->getAutoPostBack();
		$options['CausesValidation'] = $this->getCausesValidation();
		$options['ValidationGroup'] = $this->getValidationGroup();
		$options['TextMode'] = $this->getTextMode();
		return $options;
	}

	/**
	 * Loads user input data.
	 * This method is primarly used by framework developers.
	 * @param string the key that can be used to retrieve data from the input data collection
	 * @param array the input data collection
	 * @return boolean whether the data of the component has been changed
	 */
	public function loadPostData($key,$values)
	{
		$value=$values[$key];
		if($this->getAutoTrim())
			$value=trim($value);
		if(!$this->getReadOnly() && $this->getText()!==$value)
		{
			$this->setText($value);
			return $this->_dataChanged=true;
		}
		else
			return false;
	}

	/**
	 * Returns a value indicating whether postback has caused the control data change.
	 * This method is required by the \Prado\Web\UI\IPostBackDataHandler interface.
	 * @return boolean whether postback has caused the control data change. False if the page is not in postback mode.
	 */
	public function getDataChanged()
	{
		return $this->_dataChanged;
	}

	/**
	 * Returns the value to be validated.
	 * This methid is required by \Prado\Web\UI\IValidatable interface.
	 * @return mixed the value of the property to be validated.
	 */
	public function getValidationPropertyValue()
	{
		return $this->getText();
	}

	/**
	 * Returns true if this control validated successfully.
	 * Defaults to true.
	 * @return bool wether this control validated successfully.
	 */
	public function getIsValid()
	{
	    return $this->_isValid;
	}
	/**
	 * @param bool wether this control is valid.
	 */
	public function setIsValid($value)
	{
	    $this->_isValid=TPropertyValue::ensureBoolean($value);
	}

	/**
	 * Raises <b>OnTextChanged</b> event.
	 * This method is invoked when the value of the {@link getText Text}
	 * property changes on postback.
	 * 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 onTextChanged($param)
	{
		$this->raiseEvent('OnTextChanged',$this,$param);
	}

	/**
	 * Raises postdata changed event.
	 * This method is required by {@link \Prado\Web\UI\IPostBackDataHandler} interface.
	 * It is invoked by the framework when {@link getText Text} property
	 * is changed on postback.
	 * This method is primarly used by framework developers.
	 */
	public function raisePostDataChangedEvent()
	{
		if($this->getAutoPostBack() && $this->getCausesValidation())
			$this->getPage()->validate($this->getValidationGroup());
		$this->onTextChanged(null);
	}

	/**
	 * Renders the body content of the textbox when it is in MultiLine text mode.
	 * @param THtmlWriter the writer for rendering
	 */
	public function renderContents($writer)
	{
		if($this->getTextMode()==='MultiLine')
			$writer->write(THttpUtility::htmlEncode($this->getText()));
	}

	/**
	 * Renders an additional line-break after the opening tag when it
	 * is in MultiLine text mode.
	 * @param THtmlWriter the writer used for the rendering purpose^M
	 */
	public function renderBeginTag($writer)
	{
		parent::renderBeginTag($writer);
		if($this->getTextMode()==='MultiLine')
			$writer->write("\n");
	}

	/**
	 * @return TTextBoxAutoCompleteType the AutoComplete type of the textbox
	 */
	public function getAutoCompleteType()
	{
		return $this->getViewState('AutoCompleteType',TTextBoxAutoCompleteType::None);
	}

	/**
	 * @param TTextBoxAutoCompleteType the AutoComplete type of the textbox, default value is TTextBoxAutoCompleteType::None.
	 * @throws TInvalidDataValueException if the input parameter is not a valid AutoComplete type
	 */
	public function setAutoCompleteType($value)
	{
		$this->setViewState('AutoCompleteType',TPropertyValue::ensureEnum($value,'TTextBoxAutoCompleteType'),TTextBoxAutoCompleteType::None);
	}

	/**
	 * @return boolean a value indicating whether an automatic postback to the server
     * will occur whenever the user modifies the text in the TTextBox control and
     * then tabs out of the component. Defaults to false.
	 */
	public function getAutoPostBack()
	{
		return $this->getViewState('AutoPostBack',false);
	}

	/**
	 * Sets the value indicating if postback automatically.
	 * An automatic postback to the server will occur whenever the user
	 * modifies the text in the TTextBox control and then tabs out of the component.
	 * @param boolean the value indicating if postback automatically
	 */
	public function setAutoPostBack($value)
	{
		$this->setViewState('AutoPostBack',TPropertyValue::ensureBoolean($value),false);
	}

	/**
	 * @return boolean a value indicating whether the input text should be trimmed spaces. Defaults to false.
	 */
	public function getAutoTrim()
	{
		return $this->getViewState('AutoTrim',false);
	}

	/**
	 * Sets the value indicating if the input text should be trimmed spaces
	 * @param boolean the value indicating if the input text should be trimmed spaces
	 */
	public function setAutoTrim($value)
	{
		$this->setViewState('AutoTrim',TPropertyValue::ensureBoolean($value),false);
	}

	/**
	 * @return boolean whether postback event trigger by this text box will cause input validation, default is true.
	 */
	public function getCausesValidation()
	{
		return $this->getViewState('CausesValidation',true);
	}

	/**
	 * @param boolean whether postback event trigger by this text box will cause input validation.
	 */
	public function setCausesValidation($value)
	{
		$this->setViewState('CausesValidation',TPropertyValue::ensureBoolean($value),true);
	}

	/**
	 * @return integer the display width of the text box in characters, default is 0 meaning not set.
	 */
	public function getColumns()
	{
		return $this->getViewState('Columns',0);
	}

	/**
	 * Sets the display width of the text box in characters.
	 * @param integer the display width, set it 0 to clear the setting
	 */
	public function setColumns($value)
	{
		$this->setViewState('Columns',TPropertyValue::ensureInteger($value),0);
	}

	/**
	 * @return integer the maximum number of characters allowed in the text box, default is 0 meaning not set.
	 */
	public function getMaxLength()
	{
		return $this->getViewState('MaxLength',0);
	}

	/**
	 * Sets the maximum number of characters allowed in the text box.
	 * @param integer the maximum length,  set it 0 to clear the setting
	 */
	public function setMaxLength($value)
	{
		$this->setViewState('MaxLength',TPropertyValue::ensureInteger($value),0);
	}

	/**
	 * @return boolean whether the textbox is read only, default is false.
	 */
	public function getReadOnly()
	{
		return $this->getViewState('ReadOnly',false);
	}

	/**
	 * @param boolean whether the textbox is read only
	 */
	public function setReadOnly($value)
	{
		$this->setViewState('ReadOnly',TPropertyValue::ensureBoolean($value),false);
	}

	/**
	 * @return integer the number of rows displayed in a multiline text box, default is 4
	 */
	public function getRows()
	{
		return $this->getViewState('Rows',self::DEFAULT_ROWS);
	}

	/**
	 * Sets the number of rows displayed in a multiline text box.
	 * @param integer the number of rows
	 */
	public function setRows($value)
	{
		$this->setViewState('Rows',TPropertyValue::ensureInteger($value),self::DEFAULT_ROWS);
	}

	/**
	 * @return boolean whether password should be displayed in the textbox during postback. Defaults to false. This property only applies when TextMode='Password'.
	 */
	public function getPersistPassword()
	{
		return $this->getViewState('PersistPassword',false);
	}

	/**
	 * @param boolean whether password should be displayed in the textbox during postback. This property only applies when TextMode='Password'.
	 */
	public function setPersistPassword($value)
	{
		$this->setViewState('PersistPassword',TPropertyValue::ensureBoolean($value),false);
	}

	/**
	 * @return string the text content of the TTextBox control.
	 */
	public function getText()
	{
		return $this->getViewState('Text','');
	}

	/**
	 * Sets the text content of the TTextBox control.
	 * @param string the text content
	 */
	public function setText($value)
	{
		$this->setViewState('Text',$value,'');
		$this->_safeText = null;
	}

	/**
	 * Returns the text content of the TTextBox control.
	 * This method is required by {@link \Prado\IDataRenderer}.
	 * It is the same as {@link getText()}.
	 * @return string the text content of the TTextBox control.
	 * @see getText
	 * @since 3.1.0
	 */
	public function getData()
	{
		return $this->getText();
	}

	/**
	 * Sets the text content of the TTextBox control.
	 * This method is required by {@link \Prado\IDataRenderer}.
	 * It is the same as {@link setText()}.
	 * @param string the text content of the TTextBox control.
	 * @see setText
	 * @since 3.1.0
	 */
	public function setData($value)
	{
		$this->setText($value);
	}

	/**
	 * @return string safe text content with javascript stripped off
	 */
	public function getSafeText()
	{
		if($this->_safeText===null)
			$this->_safeText=$this->getSafeTextParser()->parse($this->getText());
		return $this->_safeText;
	}

	/**
	 * @return mixed safe text parser
	 */
	protected function getSafeTextParser()
	{
		if(!self::$_safeTextParser)
			self::$_safeTextParser=Prado::createComponent('System.Vendor.SafeHtml.TSafeHtmlParser');
		return self::$_safeTextParser;
	}

	/**
	 * @return TTextBoxMode the behavior mode of the TTextBox component. Defaults to TTextBoxMode::SingleLine.
	 */
	public function getTextMode()
	{
		return $this->getViewState('TextMode',TTextBoxMode::SingleLine);
	}

	/**
	 * Sets the behavior mode of the TTextBox component.
	 * @param TTextBoxMode the text mode
	 * @throws TInvalidDataValueException if the input value is not a valid text mode.
	 */
	public function setTextMode($value)
	{
		$this->setViewState('TextMode',TPropertyValue::ensureEnum($value,'TTextBoxMode'),TTextBoxMode::SingleLine);
	}

	/**
	 * @return string the group of validators which the text box causes validation upon postback
	 */
	public function getValidationGroup()
	{
		return $this->getViewState('ValidationGroup','');
	}

	/**
	 * @param string the group of validators which the text box causes validation upon postback
	 */
	public function setValidationGroup($value)
	{
		$this->setViewState('ValidationGroup',$value,'');
	}

	/**
	 * @return boolean whether the text content wraps within a multiline text box. Defaults to true.
	 */
	public function getWrap()
	{
		return $this->getViewState('Wrap',true);
	}

	/**
	 * Sets the value indicating whether the text content wraps within a multiline text box.
	 * @param boolean whether the text content wraps within a multiline text box.
	 */
	public function setWrap($value)
	{
		$this->setViewState('Wrap',TPropertyValue::ensureBoolean($value),true);
	}
}