<?php
// Copyright (C) 2010-2012 Combodo SARL
//
//   This file is part of iTop.
//
//   iTop is free software; you can redistribute it and/or modify	
//   it under the terms of the GNU Affero General Public License as published by
//   the Free Software Foundation, either version 3 of the License, or
//   (at your option) any later version.
//
//   iTop is distributed in the hope that it will be useful,
//   but WITHOUT ANY WARRANTY; without even the implied warranty of
//   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//   GNU Affero General Public License for more details.
//
//   You should have received a copy of the GNU Affero General Public License
//   along with iTop. If not, see <http://www.gnu.org/licenses/>


/**
 * Class WebPage
 *
 * @copyright   Copyright (C) 2010-2012 Combodo SARL
 * @license     http://opensource.org/licenses/AGPL-3.0
 */


/**
 * Generic interface common to CLI and Web pages
 */
Interface Page
{
	public function output();
	public function add($sText);
	public function p($sText);
	public function pre($sText);
	public function add_comment($sText);
	public function table($aConfig, $aData, $aParams = array());
}
 


/**
 * Simple helper class to ease the production of HTML pages
 *
 * This class provide methods to add content, scripts, includes... to a web page 
 * and renders the full web page by putting the elements in the proper place & order
 * when the output() method is called.
 * Usage:
 * 	$oPage = new WebPage("Title of my page");
 *	$oPage->p("Hello World !");
 *	$oPage->output();
 */
class WebPage implements Page
{
    protected $s_title;
    protected $s_content;
    protected $s_deferred_content;
    protected $a_scripts;
    protected $a_styles;
    protected $a_include_scripts;
    protected $a_include_stylesheets;
    protected $a_headers;
    protected $a_base;
    protected $iNextId;
    protected $iTransactionId;
	protected $sContentType;
	protected $sContentDisposition;
	protected $sContentFileName;
	protected $s_sOutputFormat;
	protected $a_OutputOptions;
	    
    public function __construct($s_title)
    {
        $this->s_title = $s_title;
        $this->s_content = "";
        $this->s_deferred_content = '';
        $this->a_scripts = array();
        $this->a_styles = array();
        $this->a_linked_scripts = array();
        $this->a_linked_stylesheets = array();
        $this->a_headers = array();
        $this->a_base = array( 'href' => '', 'target' => '');
        $this->iNextId = 0;
        $this->iTransactionId = 0;
        $this->sContentType = '';
        $this->sContentDisposition = '';
        $this->sContentFileName = '';
		$this->s_OutputFormat = utils::ReadParam('output_format', 'html');
		$this->a_OutputOptions = array();
        ob_start(); // Start capturing the output
    }
	
	/**
	 * Change the title of the page after its creation
	 */
    public function set_title($s_title)
    {
        $this->s_title = $s_title;
    }
    
	/**
	 * Specify a default URL and a default target for all links on a page
	 */
    public function set_base($s_href = '', $s_target = '')
    {
        $this->a_base['href'] = $s_href;
        $this->a_base['target'] = $s_target;
    }
    
	/**
	 * Add any text or HTML fragment to the body of the page
	 */
    public function add($s_html)
    {
        $this->s_content .= $s_html;
    }
    
	/**
	 * Add any text or HTML fragment (identified by an ID) at the end of the body of the page
	 * This is useful to add hidden content, DIVs or FORMs that should not
	 * be embedded into each other.	 	 
	 */
    public function add_at_the_end($s_html, $sId = '')
    {
        $this->s_deferred_content .= $s_html;
    }
    
	/**
	 * Add a paragraph to the body of the page
	 */
    public function p($s_html)
    {
        $this->add($this->GetP($s_html));
    }
    
	/**
	 * Add a pre-formatted text to the body of the page
	 */
    public function pre($s_html)
    {
        $this->add('<pre>'.$s_html.'</pre>');
    }
    
	/**
	 * Add a comment
	 */
    public function add_comment($sText)
    {
        $this->add('<!--'.$sText.'-->');
    }
	/**
	 * Add a paragraph to the body of the page
	 */
    public function GetP($s_html)
    {
        return "<p>$s_html</p>\n";
    }
    
	/**
	* Adds a tabular content to the web page
	* @param Hash $aConfig Configuration of the table: hash array of 'column_id' => 'Column Label'
	* @param Hash $aData Hash array. Data to display in the table: each row is made of 'column_id' => Data. A column 'pkey' is expected for each row
	* @param Hash $aParams Hash array. Extra parameters for the table.
	* @return void
	*/	  
	public function table($aConfig, $aData, $aParams = array())
	{
		$this->add($this->GetTable($aConfig, $aData, $aParams));
	}
	
	public function GetTable($aConfig, $aData, $aParams = array())
	{
		$oAppContext = new ApplicationContext();
		
		static $iNbTables = 0;
		$iNbTables++;
		$sHtml = "";
		$sHtml .= "<table class=\"listResults\">\n";
		$sHtml .= "<thead>\n";
		$sHtml .= "<tr>\n";
		foreach($aConfig as $sName=>$aDef)
		{
			$sHtml .= "<th title=\"".$aDef['description']."\">".$aDef['label']."</th>\n";
		}
		$sHtml .= "</tr>\n";
		$sHtml .= "</thead>\n";
		$sHtml .= "<tbody>\n";
		foreach($aData as $aRow)
		{
			$sHtml .= $this->GetTableRow($aRow, $aConfig);
		}
		$sHtml .= "</tbody>\n";
		$sHtml .= "</table>\n";
		return $sHtml;
	}
	
	public function GetTableRow($aRow, $aConfig)
	{
		$sHtml = '';
		if (isset($aRow['@class'])) // Row specific class, for hilighting certain rows
		{
			$sHtml .= "<tr class=\"{$aRow['@class']}\">";				
		}
		else
		{
			$sHtml .= "<tr>";
		}
		foreach($aConfig as $sName=>$aAttribs)
		{
			$sClass = isset($aAttribs['class']) ? 'class="'.$aAttribs['class'].'"' : '';
			$sValue = ($aRow[$sName] === '') ? '&nbsp;' : $aRow[$sName];
			$sHtml .= "<td $sClass>$sValue</td>";
		}
		$sHtml .= "</tr>";
		return $sHtml;	
	}
    
	/**
	 * Add some Javascript to the header of the page
	 */
    public function add_script($s_script)
    {
        $this->a_scripts[] = $s_script;
    }
    
	/**
	 * Add some Javascript to the header of the page
	 */
    public function add_ready_script($s_script)
    {
        // Do nothing silently... this is not supported by this type of page...
    }
	/**
	 * Add some CSS definitions to the header of the page
	 */
    public function add_style($s_style)
    {
        $this->a_styles[] = $s_style;
    }

	/**
	 * Add a script (as an include, i.e. link) to the header of the page
	 */
    public function add_linked_script($s_linked_script)
    {
        $this->a_linked_scripts[$s_linked_script] = $s_linked_script;
    }

	/**
	 * Add a CSS stylesheet (as an include, i.e. link) to the header of the page
	 */
    public function add_linked_stylesheet($s_linked_stylesheet, $s_condition = "")
    {
        $this->a_linked_stylesheets[] = array( 'link' => $s_linked_stylesheet, 'condition' => $s_condition);
    }

	/**
	 * Add some custom header to the page
	 */
    public function add_header($s_header)
    {
        $this->a_headers[] = $s_header;
    }

	/**
	 * Add needed headers to the page so that it will no be cached
	 */
    public function no_cache()
    {
        $this->add_header("Cache-Control: no-cache, must-revalidate");  // HTTP/1.1
        $this->add_header("Expires: Fri, 17 Jul 1970 05:00:00 GMT");    // Date in the past
    }

	/**
	 * Build a special kind of TABLE useful for displaying the details of an object from a hash array of data
	 */
	public function details($aFields)
	{

		$this->add($this->GetDetails($aFields));
    }

	/**
	 * Records the current state of the 'html' part of the page output
	 * @return mixed The current state of the 'html' output
	 */    
    public function start_capture()
    {
    	return strlen($this->s_content);
    }
    
    /**
     * Returns the part of the html output that occurred since the call to start_capture
     * and removes this part from the current html output
     * @param $offset mixed The value returned by start_capture
     * @return string The part of the html output that was added since the call to start_capture
     */
    public function end_capture($offset)
    {
    	$sCaptured = substr($this->s_content, $offset);
    	$this->s_content = substr($this->s_content, 0, $offset);
    	return $sCaptured;
    }
	
	/**
	 * Build a special kind of TABLE useful for displaying the details of an object from a hash array of data
	 */
	public function GetDetails($aFields)
	{
		$sHtml = "<table class=\"details\">\n";
		$sHtml .= "<tbody>\n";
		foreach($aFields as $aAttrib)
		{
			$sHtml .= "<tr>\n";
			// By Rom, for csv import, proposed to show several values for column selection
			if (is_array($aAttrib['value']))
			{
				$sHtml .= "<td class=\"label\">".$aAttrib['label']."</td><td>".implode("</td><td>", $aAttrib['value'])."</td>\n";
			}
			else
			{
				$sHtml .= "<td class=\"label\">".$aAttrib['label']."</td><td>".$aAttrib['value']."</td>\n";
			}
			$sComment = (isset($aAttrib['comments'])) ? $aAttrib['comments'] : '&nbsp;';
			$sInfo = (isset($aAttrib['infos'])) ? $aAttrib['infos'] : '&nbsp;';
			$sHtml .= "<td>$sComment</td><td>$sInfo</td>\n";
    		$sHtml .= "</tr>\n";
		}
		$sHtml .= "</tbody>\n";
		$sHtml .= "</table>\n";
		return $sHtml;
    }

	/**
	 * Build a set of radio buttons suitable for editing a field/attribute of an object (including its validation)
	 * @param $aAllowedValues hash Array of value => display_value
	 * @param $value mixed Current value for the field/attribute
	 * @param $iId mixed Unique Id for the input control in the page
	 * @param $sFieldName string The name of the field, attr_<$sFieldName> will hold the value for the field
	 * @param $bMandatory bool Whether or not the field is mandatory
	 * @param $bVertical bool Disposition of the radio buttons vertical or horizontal
	 * @param $sValidationField string HTML fragment holding the validation field (exclamation icon...)
	 * @return string The HTML fragment corresponding to the radio buttons
	 */
	public function GetRadioButtons($aAllowedValues, $value, $iId, $sFieldName, $bMandatory, $bVertical, $sValidationField)
	{
		$idx = 0;
		$sHTMLValue = '';
		foreach($aAllowedValues as $key => $display_value)
		{
			if ((count($aAllowedValues) == 1) && ($bMandatory == 'true') )
			{
				// When there is only once choice, select it by default
				$sSelected = ' checked';
			}
			else
			{
				$sSelected = ($value == $key) ? ' checked' : '';
			}
			$sHTMLValue .= "<input type=\"radio\" id=\"{$iId}_{$key}\" name=\"radio_$sFieldName\" onChange=\"$('#{$iId}').val(this.value).trigger('change');\" value=\"$key\"$sSelected><label class=\"radio\" for=\"{$iId}_{$key}\">&nbsp;$display_value</label>&nbsp;";
			if ($bVertical)
			{
				if ($idx == 0)
				{
					// Validation icon at the end of the first line
					$sHTMLValue .= "&nbsp;{$sValidationField}\n";							
				}
				$sHTMLValue .= "<br>\n";
			}
			$idx++;
		}
		$sHTMLValue .= "<input type=\"hidden\" id=\"$iId\" name=\"$sFieldName\" value=\"$value\"/>";
		if (!$bVertical)					
		{
			// Validation icon at the end of the line
			$sHTMLValue .= "&nbsp;{$sValidationField}\n";
		}
		return $sHTMLValue;
	}
	
	/**
	 * Discard unexpected output data
	 * This is a MUST when the Page output is DATA (download of a document, download CSV export, download ...)
	 */	
	public function TrashUnexpectedOutput()
	{
		// This protection is redundant with a protection implemented in MetaModel::IncludeModule
		// which detects such issues while loading module files
		// Here, the purpose is to detect and discard characters produced by the code execution (echo)
		$sPreviousContent = ob_get_clean();
		if (trim($sPreviousContent) != '')
		{
			if (Utils::GetConfig() && Utils::GetConfig()->Get('debug_report_spurious_chars'))
			{
				IssueLog::Error("Output already started before downloading file:\nContent was:'$sPreviousContent'\n");
			}
		}
	}

	/**
	 * Outputs (via some echo) the complete HTML page by assembling all its elements
	 */
    public function output()
    {
        foreach($this->a_headers as $s_header)
        {
            header($s_header);
        }
        $s_captured_output = ob_get_contents();
        ob_end_clean();
        echo "<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Strict//EN\" \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd\">\n";
        echo "<html>\n";
        echo "<head>\n";
		echo "<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" />\n";
        echo "<title>".htmlentities($this->s_title, ENT_QUOTES, 'UTF-8')."</title>\n";
        echo $this->get_base_tag();
        foreach($this->a_linked_scripts as $s_script)
        {
        	// Make sure that the URL to the script contains the application's version number
        	// so that the new script do NOT get reloaded from the cache when the application is upgraded
        	if (strpos($s_script, '?') === false)
        	{
        		$s_script .= "?itopversion=".ITOP_VERSION;
        	}
        	else
        	{
        		$s_script .= "&itopversion=".ITOP_VERSION;
        	}
            echo "<script type=\"text/javascript\" src=\"$s_script\"></script>\n";
        }
        if (count($this->a_scripts)>0)
        {
            echo "<script type=\"text/javascript\">\n";
            foreach($this->a_scripts as $s_script)
            {
                echo "$s_script\n";
            }
            echo "</script>\n";
        }
        foreach($this->a_linked_stylesheets as $a_stylesheet)
        {
			if ($a_stylesheet['condition'] != "")
			{
				echo "<!--[if {$a_stylesheet['condition']}]>\n";
			}
            echo "<link rel=\"stylesheet\" type=\"text/css\" href=\"{$a_stylesheet['link']}\" />\n";
			if ($a_stylesheet['condition'] != "")
			{
				echo "<![endif]-->\n";
			}
        }
        
        if (count($this->a_styles)>0)
        {
            echo "<style>\n";
            foreach($this->a_styles as $s_style)
            {
                echo "$s_style\n";
            }
            echo "</style>\n";
        }
        if (class_exists('MetaModel') && MetaModel::GetConfig())
        {
 			echo "<link rel=\"shortcut icon\" href=\"".utils::GetAbsoluteUrlAppRoot()."images/favicon.ico\" />\n";
        }
        echo "</head>\n";
        echo "<body>\n";
        echo self::FilterXSS($this->s_content);
        if (trim($s_captured_output) != "")
        {
            echo "<div class=\"raw_output\">".self::FilterXSS($s_captured_output)."</div>\n";
        }
        echo '<div id="at_the_end">'.self::FilterXSS($this->s_deferred_content).'</div>';
        echo "</body>\n";
        echo "</html>\n";
    }

	/**
	 * Build a series of hidden field[s] from an array
	 */
	 // By Rom - je verrais bien une serie d'outils pour gerer des parametres que l'on retransmet entre pages d'un wizard...
	 //          ptet deriver webpage en webwizard
	public function add_input_hidden($sLabel, $aData)
	{
		foreach($aData as $sKey=>$sValue)
		{
			$this->add("<input type=\"hidden\" name=\"".$sLabel."[$sKey]\" value=\"$sValue\">");
		}
	}

	protected function get_base_tag()
	{
		$sTag = '';
        if (($this->a_base['href'] != '') || ($this->a_base['target'] != ''))
        {
        	$sTag = '<base ';
        	if (($this->a_base['href'] != ''))
        	{
        		$sTag .= "href =\"{$this->a_base['href']}\" ";
			}
        	if (($this->a_base['target'] != ''))
        	{
        		$sTag .= "target =\"{$this->a_base['target']}\" ";
			}
			$sTag .= " />\n";
		}
		return $sTag;
	}
	
	/**
	 * Get an ID (for any kind of HTML tag) that is guaranteed unique in this page
	 * @return int The unique ID (in this page)
	 */
	public function GetUniqueId()
	{
		return $this->iNextId++;
	}

	/**
	 * Set the content-type (mime type) for the page's content
	 * @param $sContentType string
	 * @return void
	 */
	public function SetContentType($sContentType)
	{
		$this->sContentType = $sContentType;
	}
		
	/**
	 * Set the content-disposition (mime type) for the page's content
	 * @param $sDisposition string The disposition: 'inline' or 'attachment'
	 * @param $sFileName string The original name of the file
	 * @return void
	 */
	public function SetContentDisposition($sDisposition, $sFileName)
	{
		$this->sContentDisposition = $sDisposition;
		$this->sContentFileName = $sFileName;
	}
		
	/**
	 * Set the transactionId of the current form
	 * @param $iTransactionId integer
	 * @return void
	 */
	public function SetTransactionId($iTransactionId)
	{
		$this->iTransactionId = $iTransactionId;
	}
	
	/**
	 * Returns the transactionId of the current form
	 * @return integer The current transactionID
	 */
	public function GetTransactionId()
	{
		return $this->iTransactionId;
	}
	
	public static function FilterXSS($sHTML)
	{
		return str_ireplace('<script', '&lt;script', $sHTML);
	}
	
	/**
	 * What is the currently selected output format
	 * @return string The selected output format: html, pdf...
	 */
	public function GetOutputFormat()
	{
		return $this->s_OutputFormat;
	}

	/**
	 * Check whether the desired output format is possible or not
	 * @param string $sOutputFormat The desired output format: html, pdf...
	 * @return bool True if the format is Ok, false otherwise
	 */
	function IsOutputFormatAvailable($sOutputFormat)
	{
		$bResult = false;
		switch($sOutputFormat)
		{
			case 'html':
			$bResult = true; // Always supported
			break;
			
			case 'pdf':
			$bResult = @is_readable(APPROOT.'lib/MPDF/mpdf.php');
			break;
		}
		return $bResult;
	}
	
	/** 
	 * Retrieves the value of a named output option for the given format
	 * @param string $sFormat The format: html or pdf
	 * @param string $sOptionName The name of the option
	 * @return mixed false if the option was never set or the options's value
	 */
	public function GetOutputOption($sFormat, $sOptionName)
	{
		if (isset($this->a_OutputOptions[$sFormat][$sOptionName]))
		{
			return $this->a_OutputOptions[$sFormat][$sOptionName];
		}
		return false;
	}
	/**
	 * Sets a named output option for the given format
	 * @param string $sFormat The format for which to set the option: html or pdf
	 * @param string $sOptionName the name of the option
	 * @param mixed $sValue The value of the option
	 */
	public function SetOutputOption($sFormat, $sOptionName, $sValue)
	{
		if (!isset($this->a_OutputOptions[$sFormat]))
		{
			$this->a_OutputOptions[$sFormat] = array($sOptionName => $sValue);
		}
		else
		{
			$this->a_OutputOptions[$sFormat][$sOptionName] = $sValue;
		}
	}
	
	public function RenderPopupMenuItems($aActions, $aFavoriteActions = array())
	{
		$sPrevUrl = '';
		$sHtml = '';
		foreach ($aActions as $aAction)
		{
			$sClass = isset($aAction['class']) ? " class=\"{$aAction['class']}\"" : "";
			$sOnClick = isset($aAction['onclick']) ? " onclick=\"{$aAction['onclick']}\"" : "";
			if (empty($aAction['url']))
			{
				if ($sPrevUrl != '') // Don't output consecutively two separators...
				{
					$sHtml .= "<li>{$aAction['label']}</li>";			
				}
				$sPrevUrl = '';
			}
			else
			{
				$sHtml .= "<li><a href=\"{$aAction['url']}\"$sClass $sOnClick>{$aAction['label']}</a></li>";
				$sPrevUrl = $aAction['url'];
			}
		}
		$sHtml .= "</ul></li></ul></div>";
		foreach(array_reverse($aFavoriteActions) as $aAction)
		{
			$sHtml .= "<div class=\"actions_button\"><a href='{$aAction['url']}'>{$aAction['label']}</a></div>";			
		}
		
		return $sHtml;
	}
}
?>