<?php

function FCKeditor_IsCompatibleBrowser()
{
	if ( isset( $_SERVER ) ) {
		$sAgent = $_SERVER['HTTP_USER_AGENT'] ;
	}
	else {
		global $HTTP_SERVER_VARS ;
		if ( isset( $HTTP_SERVER_VARS ) ) {
			$sAgent = $HTTP_SERVER_VARS['HTTP_USER_AGENT'] ;
		}
		else {
			global $HTTP_USER_AGENT ;
			$sAgent = $HTTP_USER_AGENT ;
		}
	}

	if ( strpos($sAgent, 'MSIE') !== false && strpos($sAgent, 'mac') === false && strpos($sAgent, 'Opera') === false )
	{
		$iVersion = (float)substr($sAgent, strpos($sAgent, 'MSIE') + 5, 3) ;
		return ($iVersion >= 5.5) ;
	}
	else if ( strpos($sAgent, 'Gecko/') !== false )
	{
		$iVersion = (int)substr($sAgent, strpos($sAgent, 'Gecko/') + 6, 8) ;
		return ($iVersion >= 20030210) ;
	}
	else if ( strpos($sAgent, 'Opera/') !== false )
	{
		$fVersion = (float)substr($sAgent, strpos($sAgent, 'Opera/') + 6, 4) ;
		return ($fVersion >= 9.5) ;
	}
	else if ( preg_match( "|AppleWebKit/(\d+)|i", $sAgent, $matches ) )
	{
		$iVersion = $matches[1] ;
		return ( $matches[1] >= 522 ) ;
	}
	else
		return false ;
}

class FCKeditor
{
	var $InstanceName ;
	var $BasePath ;
	var $Width ;
	var $Height ;
	var $ToolbarSet ;
	var $Value ;
	var $Config ;

	function __construct( $instanceName )
	{
		$this->InstanceName	= $instanceName ;
		$this->BasePath		= '/editor/' ;
		$this->Width		= '100%' ;
		$this->Height		= '350' ;
		$this->ToolbarSet	= 'Default' ;
		$this->Value		= '' ;
		$this->Config		= array() ;
	}
	
	function FCKeditor( $instanceName )
	{
		$this->__construct( $instanceName );
	}

	function Create()
	{
		echo $this->CreateHtml() ;
	}

	function CreateHtml()
	{
		$HtmlValue = htmlspecialchars( $this->Value ) ;

		$Html = '' ;

		if ( !isset( $_GET ) ) {
			global $HTTP_GET_VARS ;
			$_GET = $HTTP_GET_VARS ;
		}

		if ( $this->IsCompatible() )
		{
			$File = 'fckeditor.html' ;

			$Link = "{$this->BasePath}editor/{$File}?InstanceName={$this->InstanceName}" ;

			if ( $this->ToolbarSet != '' )
				$Link .= "&amp;Toolbar={$this->ToolbarSet}" ;

			// Render the linked hidden field.
			$Html .= "<input type=\"hidden\" id=\"{$this->InstanceName}\" name=\"{$this->InstanceName}\" value=\"{$HtmlValue}\" style=\"display:none\" />" ;

			// Render the configurations hidden field.
			$Html .= "<input type=\"hidden\" id=\"{$this->InstanceName}___Config\" value=\"" . $this->GetConfigFieldString() . "\" style=\"display:none\" />" ;

			// Render the editor IFRAME.
			$Html .= "<iframe id=\"{$this->InstanceName}___Frame\" src=\"{$Link}\" width=\"{$this->Width}\" height=\"{$this->Height}\" frameborder=\"0\" scrolling=\"no\"></iframe>" ;
		}
		else
		{
			if ( strpos( $this->Width, '%' ) === false )
				$WidthCSS = $this->Width . 'px' ;
			else
				$WidthCSS = $this->Width ;

			if ( strpos( $this->Height, '%' ) === false )
				$HeightCSS = $this->Height . 'px' ;
			else
				$HeightCSS = $this->Height ;

			$Html .= "<textarea name=\"{$this->InstanceName}\" rows=\"4\" cols=\"40\" style=\"width: {$WidthCSS}; height: {$HeightCSS}\">{$HtmlValue}</textarea>" ;
		}

		return $Html ;
	}

	function IsCompatible()
	{
		return FCKeditor_IsCompatibleBrowser() ;
	}

	function GetConfigFieldString()
	{
		$sParams = '' ;
		$bFirst = true ;

		foreach ( $this->Config as $sKey => $sValue )
		{
			if ( $bFirst == false )
				$sParams .= '&amp;' ;
			else
				$bFirst = false ;

			if ( $sValue === true )
				$sParams .= $this->EncodeConfig( $sKey ) . '=true' ;
			else if ( $sValue === false )
				$sParams .= $this->EncodeConfig( $sKey ) . '=false' ;
			else
				$sParams .= $this->EncodeConfig( $sKey ) . '=' . $this->EncodeConfig( $sValue ) ;
		}

		return $sParams ;
	}

	function EncodeConfig( $valueToEncode )
	{
		$chars = array(
			'&' => '%26',
			'=' => '%3D',
			'"' => '%22' ) ;

		return strtr( $valueToEncode,  $chars ) ;
	}
}

?>