<?php
require_once('../core/config.class.inc.php');

define('ITOP_CONFIG_FILE', '../config-itop.php');

class FileUploadException extends Exception
{
}

class utils
{
	private static $m_oConfig = null;

	public static function ReadParam($sName, $defaultValue = "")
	{
		return isset($_REQUEST[$sName]) ? $_REQUEST[$sName] : $defaultValue;
	}
	
	public static function ReadPostedParam($sName, $defaultValue = "")
	{
		return isset($_POST[$sName]) ? $_POST[$sName] : $defaultValue;
	}
	
	/**
	 * Reads an uploaded file and turns it into an ormDocument object - Triggers an exception in case of error
	 * @param string $sName Name of the input used from uploading the file	 
	 * @return ormDocument The uploaded file (can be 'empty' if nothing was uploaded)
	 */	 	 
	public static function  ReadPostedDocument($sName)
	{
		$oDocument = new ormDocument(); // an empty document
		if(isset($_FILES[$sName]))
		{
			switch($_FILES[$sName]['error'])
			{
				case UPLOAD_ERR_OK:
				$doc_content = file_get_contents($_FILES[$sName]['tmp_name']);
				$sMimeType = $_FILES[$sName]['type'];
				if (function_exists('finfo_file'))
				{
					// as of PHP 5.3 the fileinfo extension is bundled within PHP
					// in which case we don't trust the mime type provided by the browser
					$rInfo = @finfo_open(FILEINFO_MIME_TYPE); // return mime type ala mimetype extension
					if ($rInfo !== false)
					{
					   $sType = @finfo_file($rInfo, $file);
					   if ( ($sType !== false)
					        && is_string($sType)
					        && (strlen($sType)>0))
					   {
					        $sMimeType = $sType;
					   }
					}
					@finfo_close($finfo);
				}
				$oDocument = new ormDocument($doc_content, $sMimeType, $_FILES[$sName]['name']);
				break;
				
				case UPLOAD_ERR_NO_FILE:
				// no file to load, it's a normal case, just return an empty document
				break;
				
				case UPLOAD_ERR_FORM_SIZE:
				case UPLOAD_ERR_INI_SIZE:
				throw new FileUploadException("Uploaded file is too big. (Max allowed size is ".ini_get('upload_max_filesize').". Check you PHP configuration for upload_max_filesize.");
				break;

				case UPLOAD_ERR_PARTIAL:
				throw new FileUploadException("File upload failed, file has been truncated.");
				break;
				
				case UPLOAD_ERR_NO_TMP_DIR:
				throw new FileUploadException("Missing a temporary folder.");
				break;

				case UPLOAD_ERR_CANT_WRITE:
				throw new FileUploadException("Unable to write the temporary file to the disk (upload_tmp_dir = ".ini_get('upload_tmp_dir').")");
				break;

				case UPLOAD_ERR_EXTENSION:
				throw new FileUploadException("File upload stopped by extension. (Original file name: ".$_FILES[$sName]['name'].")");
				break;
				
				default:
				throw new FileUploadException("File upload failed, unknown cause (Error code = ".$_FILES[$sName]['error'].")");
				break;

			}
		}
		return $oDocument;
	}
	
	public static function GetNewTransactionId()
	{
		// TO DO implement the real mechanism here
		return sprintf("%08x", rand(0,2000000000));
	}
	
	public static function IsTransactionValid($sId)
	{
		// TO DO implement the real mechanism here
		return true;
	}
	
	public static function ReadFromFile($sFileName)
	{
		if (!file_exists($sFileName)) return false;
		return file_get_contents($sFileName);
	}

	/**
	 * Get access to the application config file
	 * @param none
	 * @return Config The Config object initialized from the application config file
	 */	 	 	 	
	public static function GetConfig()
	{
		if (self::$m_oConfig == null)
		{
			self::$m_oConfig = new Config(ITOP_CONFIG_FILE);
		}
		return self::$m_oConfig;
	}
	/**
	 * Helper function to convert a value expressed in a 'user friendly format'
	 * as in php.ini, e.g. 256k, 2M, 1G etc. Into a number of bytes
	 * @param mixed $value The value as read from php.ini
	 * @return number
	 */	 	  
	public static function ConvertToBytes( $value )
	{
		$iReturn = $value;
	    if ( !is_numeric( $value ) )
		{
	        $iLength = strlen( $value );
	        $iReturn = substr( $value, 0, $iLength - 1 );
	        $sUnit = strtoupper( substr( $value, $iLength - 1 ) );
	        switch ( $sUnit )
			{
	            case 'G':
	                $iReturn *= 1024;
	            case 'M':
	                $iReturn *= 1024;
	            case 'K':
	                $iReturn *= 1024;
	        }
	    }
        return $iReturn;
    }
}
?>