<?php

/**
 * This file is part of the Froxlor project.
 * Copyright (c) 2003-2009 the SysCP Team (see authors).
 * Copyright (c) 2010 the Froxlor Team (see authors).
 *
 * For the full copyright and license information, please view the COPYING
 * file that was distributed with this source code. You can also view the
 * COPYING file online at http://files.froxlor.org/misc/COPYING.txt
 *
 * @copyright  (c) the authors
 * @author     Florian Lippert <flo@syscp.org> (2003-2009)
 * @author     Froxlor team <team@froxlor.org> (2010-)
 * @license    GPLv2 http://files.froxlor.org/misc/COPYING.txt
 * @package    Classes
 *
 */

/**
 * Class to manage paging system
 * @package Functions
 */

class paging
{
	/**
	 * Userinfo
	 * @var array
	 */

	var $userinfo = array();

	/**
	 * Database handler
	 * @var db
	 */

	var $db = false;

	/**
	 * MySQL-Table
	 * @var string
	 */

	var $table = '';

	/**
	 * Fields with description which should be selectable
	 * @var array
	 */

	var $fields = array();

	/**
	 * Entries per page
	 * @var int
	 */

	var $entriesperpage = 0;

	/**
	 * Number of entries of table
	 * @var int
	 */

	var $entries = 0;

	/**
	 * Sortorder, asc or desc
	 * @var string
	 */

	var $sortorder = 'asc';

	/**
	 * Sortfield
	 * @var string
	 */

	var $sortfield = '';

	/**
	 * Searchfield
	 * @var string
	 */

	var $searchfield = '';

	/**
	 * Searchtext
	 * @var string
	 */

	var $searchtext = '';

	/**
	 * Pagenumber
	 * @var int
	 */

	var $pageno = 0;

	/**
	 * Switch natsorting on/off
	 * @var bool
	 */

	var $natSorting = false;

	/**
	 * Class constructor. Loads settings from request or from userdata and saves them to session.
	 *
	 * @param array userinfo
	 * @param string Name of Table
	 * @param array Fields, in format array( 'fieldname_in_mysql' => 'field_caption' )
	 * @param int entries per page
	 * @param bool Switch natsorting on/off (global, affects all calls of sort)
	 */

	function paging($userinfo, $db, $table, $fields, $entriesperpage, $natSorting = false)
	{
		$this->userinfo = $userinfo;

		if(!is_array($this->userinfo['lastpaging']))
		{
			$this->userinfo['lastpaging'] = unserialize($this->userinfo['lastpaging']);
		}

		$this->db = $db;
		$this->table = $table;
		$this->fields = $fields;
		$this->entriesperpage = $entriesperpage;
		$this->natSorting = $natSorting;
		$checklastpaging = (isset($this->userinfo['lastpaging']['table']) && $this->userinfo['lastpaging']['table'] == $this->table);
		$this->userinfo['lastpaging']['table'] = $this->table;

		if(isset($_REQUEST['sortorder'])
		   && (strtolower($_REQUEST['sortorder']) == 'desc' || strtolower($_REQUEST['sortorder']) == 'asc'))
		{
			$this->sortorder = strtolower($_REQUEST['sortorder']);
		}
		else
		{
			if($checklastpaging
			   && isset($this->userinfo['lastpaging']['sortorder'])
			   && (strtolower($this->userinfo['lastpaging']['sortorder']) == 'desc' || strtolower($this->userinfo['lastpaging']['sortorder']) == 'asc'))
			{
				$this->sortorder = strtolower($this->userinfo['lastpaging']['sortorder']);
			}
			else
			{
				$this->sortorder = 'asc';
			}
		}

		$this->userinfo['lastpaging']['sortorder'] = $this->sortorder;

		if(isset($_REQUEST['sortfield'])
		   && isset($fields[$_REQUEST['sortfield']]))
		{
			$this->sortfield = $_REQUEST['sortfield'];
		}
		else
		{
			if($checklastpaging
			   && isset($this->userinfo['lastpaging']['sortfield'])
			   && isset($fields[$this->userinfo['lastpaging']['sortfield']]))
			{
				$this->sortfield = $this->userinfo['lastpaging']['sortfield'];
			}
			else
			{
				$fieldnames = array_keys($fields);
				$this->sortfield = $fieldnames[0];
			}
		}

		$this->userinfo['lastpaging']['sortfield'] = $this->sortfield;

		if(isset($_REQUEST['searchfield'])
		   && isset($fields[$_REQUEST['searchfield']]))
		{
			$this->searchfield = $_REQUEST['searchfield'];
		}
		else
		{
			if($checklastpaging
			   && isset($this->userinfo['lastpaging']['searchfield'])
			   && isset($fields[$this->userinfo['lastpaging']['searchfield']]))
			{
				$this->searchfield = $this->userinfo['lastpaging']['searchfield'];
			}
			else
			{
				$fieldnames = array_keys($fields);
				$this->searchfield = $fieldnames[0];
			}
		}

		$this->userinfo['lastpaging']['searchfield'] = $this->searchfield;

		if(isset($_REQUEST['searchtext'])
		   && (preg_match("/^[@0-9a-zA-Z籙馺傸綅-\*\.]+$/", $_REQUEST['searchtext']) || $_REQUEST['searchtext'] === ''))
		{
			$this->searchtext = $_REQUEST['searchtext'];
		}
		else
		{
			if($checklastpaging
			   && isset($this->userinfo['lastpaging']['searchtext'])
			   && preg_match("/^[@0-9a-zA-Z籙馺傸綅-\*\.]+$/", $this->userinfo['lastpaging']['searchtext']))
			{
				$this->searchtext = $this->userinfo['lastpaging']['searchtext'];
			}
			else
			{
				$this->searchtext = '';
			}
		}

		$this->userinfo['lastpaging']['searchtext'] = $this->searchtext;

		if(isset($_REQUEST['pageno'])
		   && intval($_REQUEST['pageno']) != 0)
		{
			$this->pageno = intval($_REQUEST['pageno']);
		}
		else
		{
			if($checklastpaging
			   && isset($this->userinfo['lastpaging']['pageno'])
			   && intval($this->userinfo['lastpaging']['pageno']) != 0)
			{
				$this->pageno = intval($this->userinfo['lastpaging']['pageno']);
			}
			else
			{
				$this->pageno = 1;
			}
		}

		$this->userinfo['lastpaging']['pageno'] = $this->pageno;
		$query = 'UPDATE `' . TABLE_PANEL_SESSIONS . '` SET `lastpaging`="' . $this->db->escape(serialize($this->userinfo['lastpaging'])) . '" WHERE `hash`="' . $this->db->escape($userinfo['hash']) . '"  AND `userid` = "' . $this->db->escape($userinfo['userid']) . '"  AND `ipaddress` = "' . $this->db->escape($userinfo['ipaddress']) . '"  AND `useragent` = "' . $this->db->escape($userinfo['useragent']) . '"  AND `adminsession` = "' . $this->db->escape($userinfo['adminsession']) . '" ';
		$this->db->query($query);
	}

	/**
	 * Sets number of entries and adjusts pageno if the number of entries doesn't correspond to the pageno.
	 *
	 * @param int entries
	 */

	function setEntries($entries)
	{
		$this->entries = $entries;

		if(($this->pageno - 1) * $this->entriesperpage > $this->entries)
		{
			$this->pageno = 1;
		}

		return true;
	}

	/**
	 * Checks if a row should be displayed or not, used in loops
	 *
	 * @param int number of row
	 * @return bool to display or not to display, that's the question
	 */

	function checkDisplay($count)
	{
		$begin = (intval($this->pageno) - 1) * intval($this->entriesperpage);
		$end = (intval($this->pageno) * intval($this->entriesperpage));
		return (($count >= $begin && $count < $end) || $this->entriesperpage == 0);
	}

	/**
	 * Returns condition code for sql query
	 *
	 * @param bool should returned condition code start with WHERE (false) or AND (true)?
	 * @return string the condition code
	 */

	function getSqlWhere($append = false)
	{
		if($this->searchtext != '')
		{
			if($append == true)
			{
				$condition = ' AND ';
			}
			else
			{
				$condition = ' WHERE ';
			}

			$searchfield = explode('.', $this->searchfield);
			foreach($searchfield as $id => $field)
			{
				if(substr($field, -1, 1) != '`')
				{
					$field.= '`';
				}

				if($field{0} != '`')
				{
					$field = '`' . $field;
				}

				$searchfield[$id] = $field;
			}

			$searchfield = implode('.', $searchfield);
			$searchtext = str_replace('*', '%', $this->searchtext);
			$condition.= $searchfield . ' LIKE "' . $this->db->escape($searchtext) . '" ';
		}
		else
		{
			$condition = '';
		}

		return $condition;
	}

	/**
	 * Returns "order by"-code for sql query
	 *
	 * @param bool Switch natsorting on/off (local, affects just this call)
	 * @return string the "order by"-code
	 */

	function getSqlOrderBy($natSorting = null)
	{
		$sortfield = explode('.', $this->sortfield);
		foreach($sortfield as $id => $field)
		{
			if(substr($field, -1, 1) != '`')
			{
				$field.= '`';
			}

			if($field{0} != '`')
			{
				$field = '`' . $field;
			}

			$sortfield[$id] = $field;
		}

		$sortfield = implode('.', $sortfield);
		$sortorder = strtoupper($this->sortorder);

		if($natSorting == true
		   || ($natSorting === null && $this->natSorting == true))
		{
			// Acts similar to php's natsort(), found in one comment at http://my.opera.com/cpr/blog/show.dml/160556

			$sortcode = 'ORDER BY CONCAT( IF( ASCII( LEFT( ' . $sortfield . ', 1 ) ) > 57, LEFT( ' . $sortfield . ', 1 ), \'0\' ), IF( ASCII( RIGHT( ' . $sortfield . ', 1 ) ) > 57, LPAD( ' . $sortfield . ', 255, \'0\' ), LPAD( CONCAT( ' . $sortfield . ', \'-\' ), 255, \'0\' ) ) ) ' . $sortorder;
		}
		else
		{
			$sortcode = 'ORDER BY ' . $sortfield . ' ' . $sortorder;
		}

		return $sortcode;
	}

	/**
	 * Currently not used
	 *
	 * @return string always empty
	 */

	function getSqlLimit()
	{
		/**
		 * currently not in use
		 */

		return '';
	}

	/**
	 * Returns html code for sorting field
	 *
	 * @param array Language array
	 * @return string the html sortcode
	 */

	function getHtmlSortCode($lng, $break = false)
	{
		$sortcode = '';
		$fieldoptions = '';
		$orderoptions = '';

		foreach($this->fields as $fieldname => $fieldcaption)
		{
			$fieldoptions.= makeoption($fieldcaption, $fieldname, $this->sortfield, true, true);
		}

		$breakorws = ($break ? '<br />' : '&nbsp;');
		foreach(array('asc' => $lng['panel']['ascending'], 'desc' => $lng['panel']['decending']) as $sortordertype => $sortorderdescription)
		{
			$orderoptions.= makeoption($sortorderdescription, $sortordertype, $this->sortorder, true, true);
		}

		eval("\$sortcode =\"" . getTemplate("misc/htmlsortcode", '1') . "\";");
		return $sortcode;
	}

	/**
	 * Returns html code for sorting arrows
	 *
	 * @param string URL to use as base for links
	 * @param string If set, only this field will be returned
	 * @return mixed An array or a string (if field is set) of html code of arrows
	 */

	function getHtmlArrowCode($baseurl, $field = '')
	{
		if($field != ''
		   && isset($this->fields[$field]))
		{
			$baseurl = htmlspecialchars($baseurl);
			$fieldname = htmlspecialchars($field);
			eval("\$arrowcode =\"" . getTemplate("misc/htmlarrowcode", '1') . "\";");
		}
		else
		{
			$baseurl = htmlspecialchars($baseurl);
			$arrowcode = array();
			foreach($this->fields as $fieldname => $fieldcaption)
			{
				$fieldname = htmlspecialchars($fieldname);
				eval("\$arrowcode[\$fieldname] =\"" . getTemplate("misc/htmlarrowcode", '1') . "\";");
			}
		}

		return $arrowcode;
	}

	/**
	 * Returns html code for searching field
	 *
	 * @param array Language array
	 * @return string the html searchcode
	 */

	function getHtmlSearchCode($lng)
	{
		$searchcode = '';
		$fieldoptions = '';
		$searchtext = htmlspecialchars($this->searchtext);
		foreach($this->fields as $fieldname => $fieldcaption)
		{
			$fieldoptions.= makeoption($fieldcaption, $fieldname, $this->searchfield, true, true);
		}
		eval("\$searchcode =\"" . getTemplate("misc/htmlsearchcode", '1') . "\";");
		return $searchcode;
	}

	/**
	 * Returns html code for paging
	 *
	 * @param string URL to use as base for links
	 * @return string the html pagingcode
	 */

	function getHtmlPagingCode($baseurl)
	{
		if($this->entriesperpage == 0)
		{
			return '';
		}
		else
		{
			$pages = intval($this->entries / $this->entriesperpage);
		}

		if($this->entries % $this->entriesperpage != 0)
		{
			$pages++;
		}

		if($pages > 1)
		{
			$start = $this->pageno - 4;

			if($start < 1)
			{
				$start = 1;
			}

			$stop = $this->pageno + 4;

			if($stop > $pages)
			{
				$stop = $pages;
			}

			$pagingcode = '<a href="' . htmlspecialchars($baseurl) . '&amp;pageno=1">&laquo;</a> <a href="' . htmlspecialchars($baseurl) . '&amp;pageno=' . ((intval($this->pageno) - 1) == 0 ? '1' : intval($this->pageno) - 1) . '">&lt;</a>&nbsp;';
			for ($i = $start;$i <= $stop;$i++)
			{
				if($i != $this->pageno)
				{
					$pagingcode.= ' <a href="' . htmlspecialchars($baseurl) . '&amp;pageno=' . $i . '">' . $i . '</a>&nbsp;';
				}
				else
				{
					$pagingcode.= ' <strong>' . $i . '</strong>&nbsp;';
				}
			}

			$pagingcode.= ' <a href="' . htmlspecialchars($baseurl) . '&amp;pageno=' . ((intval($this->pageno) + 1) > $pages ? $pages : intval($this->pageno) + 1) . '">&gt;</a> <a href="' . $baseurl . '&amp;pageno=' . $pages . '">&raquo;</a>';
		}
		else
		{
			$pagingcode = '';
		}

		return $pagingcode;
	}
}

?>