<?php
class Search
{
	var $terms;
	var $text;
	var $xs;
	var $search;
	var $error;
	var $pager;
	var $count;
	var $related;
	var $corrected;
	var $total;
	var $search_cost;
	var $docs;
	var $hot;
	var $base_url;
	var $expanded;
 
 //require_once '/home/wlx/xunsearch/sdk/php/lib/XS.php';   
      
	private function safe_query($search)
	{
		return preg_replace('/%|_|\'|\\\\/', '\\\\$0', stripslashes($search));
	}

	function parse_search($search="", $safe = true)
	{
		if (empty($search)) $search=$this->text;
            $temp = array();
            preg_match_all('/"([^"]+)"|([^\\s]+)/', (( $safe ) ? $this->safe_query($search) : $search), $temp);
            
            for ($i = 1; $i < count($temp); $i++)
            {
                  foreach ( $temp[$i] as $value )
                  {
                        if ( strlen($value) >= 3 )
                        {
                              $this->terms[] = $value;
                        }
                  }
            }
            
	}
	
	function sql_expr($field)
   {
   	$sql=" 1=1 ";
		if (!is_array($field))
		{
			$field=array($field);
		}
		if (!count($this->terms))
			$this->parse_search();
		foreach($this->terms as $t)
		{
			$sql.=" and (1<>1 ";
			foreach($field as $f)
			{
				$sql.=" or ".$f." ilike '%".$t."%' ";
			}
			$sql.=") ";			
		} 
		return $sql;	
	}
	function __construct($text='')
	{
		require_once '/home/wlx/xunsearch/sdk/php/lib/XS.php'; 
		$this->xs=new XS('westdc');
		$this->search=$this->xs->search;
		$this->terms = array();
		$this->text=$text;

		// other variable maybe used
		$this->count = $this->total = $this->search_cost = 0;
		$this->docs = $this->related = $this->corrected =$this->expanded = $this->hot = array();
		$this->error = $this->pager = $this->base_url='';
	}
	
	function dosearch()
	{
//
// 支持的 GET 参数列表
// q: 查询语句
// m: 开启模糊搜索，其值为 yes/no
// f: 只搜索某个字段，其值为字段名称，要求该字段的索引方式为 self/both
// s: 排序字段名称及方式，其值形式为：xxx_ASC 或 xxx_DESC
// p: 显示第几页，每页数量为 XSSearch::PAGE_SIZE 即 10 条
// ie: 查询语句编码，默认为 UTF-8
// oe: 输出编码，默认为 UTF-8
// xml: 是否将搜索结果以 XML 格式输出，其值为 yes/no
//
// variables
$eu = '';
$__ = array('q', 'm', 'f', 's', 'p', 'ie', 'oe', 'syn', 'xml');
foreach ($__ as $_)
	$$_ = isset($_GET[$_]) ? $_GET[$_] : '';

// recheck request parameters
$q = get_magic_quotes_gpc() ? stripslashes($q) : $q;
$f = empty($f) ? '_all' : $f;
${'m_check'} = ($m == 'yes' ? ' checked' : '');
${'syn_check'} = ($syn == 'yes' ? ' checked' : '');
${'f_' . $f} = ' checked';
${'s_' . $s} = ' selected';
if (!isset($q)) $q='';
// base url
$this->base_url = '/search?q=' . urlencode($q) . '&m=' . $m . '&f=' . $f . '&s=' . $s . $eu;


$total_begin = microtime(true);
// perform the search
try
{
	$this->search->setCharset('UTF-8');

	if (empty($q))
	{
		// just show hot query
		$this->hot = $this->search->getHotQuery();
	}
	else
	{
		// fuzzy search
		$this->search->setFuzzy($m === 'yes');

		// synonym search
		$this->search->setAutoSynonyms($syn === 'yes');
		
		// set query
		if (!empty($f) && $f != '_all')
		{
			$this->search->setQuery($f . ':(' . $q . ')');
		}
		else
		{
			$this->search->setQuery($q);
		}

		// set sort
		if (($pos = strrpos($s, '_')) !== false)
		{
			$sf = substr($s, 0, $pos);
			$st = substr($s, $pos + 1);
			$this->search->setSort($sf, $st === 'ASC');
		}

		// set offset, limit
		$p = max(1, intval($p));
		$n = XSSearch::PAGE_SIZE;
		$this->search->setLimit($n, ($p - 1) * $n);

		// get the result
		$search_begin = microtime(true);
		$this->docs = $this->search->search();
		$this->search_cost = microtime(true) - $search_begin;

		// get other result
		$this->count = $this->search->getLastCount();
		$this->total = $this->search->getDbTotal();

		if ($xml !== 'yes')
		{
if ($this->count<1)
  $this->expanded=$this->search->getExpandedQuery($q);
			// try to corrected, if resul too few
			if ($this->count < 1 || $this->count < ceil(0.001 * $this->total))
				$this->corrected = $this->search->getCorrectedQuery();			
			// get related query
			$this->related = $this->search->getRelatedQuery();			
		}

		// gen pager
		if ($this->count > $n)
		{
			$pb = max($p - 5, 1);
			$pe = min($pb + 10, ceil($this->count / $n) + 1);
			$this->pager = '';
			do
			{
				$this->pager .= ($pb == $p) ? '<strong>' . $p . '</strong>' : '<a href="' . $this->base_url . '&p=' . $pb . '">[' . $pb . ']</a>';
			}
			while (++$pb < $pe);
		}
	}
}
catch (XSException $e)
{
	$this->error = strval($e);
}
// calculate total time cost
$this->total_cost = microtime(true) - $total_begin;

// XML OUPUT
if ($xml === 'yes' && !empty($q))
{
	header("Content-Type: text/xml; charset=$oe");
	echo "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n";
	echo "<xs:result count=\"$this->count\" total=\"$this->total\" cost=\"$this->total_cost\" xmlns:xs=\"http://www.xunsearch.com\">\n";
	if ($this->error !== '')
		echo "  <error><![CDATA[" . $this->error . "]]></error>\n";

	foreach ($this->docs as $doc)
	{
		echo "  <doc index=\"" . $doc->rank() . "\" percent=\"" . $doc->percent() . "%\">\n";
		foreach ($doc as $k => $v)
		{
			echo "    <$k>";
			if (is_numeric($v))
				echo $v;
			else
				echo "\n      <![CDATA[" . $v . "]]>\n    ";
			echo "</$k>\n";
		}
		echo "  </doc>\n";
	}
	echo "</xs:result>\n";
	exit(0);
}
}
	//搜索建议
	function suggest($q)
	{
		$terms = array();
		if (!empty($q) && strpos($q, ':') === false)
		{
			try	{
				$terms = $this->search->setCharset('UTF-8')->getExpandedQuery($q);
			}	catch (XSException $e)	{	}
		}
		return json_encode($terms);
	}
	
	//添加新文档
	//$data: 包含field和value的数组
	function add($data)
	{
		$doc=new XSDocument;
		$index=$this->xs->index;
		$doc->setFields($data);
		$index->add($doc);
	}
	
	//更新已有文档
	//$data: 包含field和value的数组
	function update($data)
	{
		$doc=new XSDocument;
		$index=$this->xs->index;
		$doc->setFields($data);
		$index->update($doc);
	}	
	//根据主键删除对应的索引
	function del($data,$field='')
	{
		$index=$this->xs->index;
		if (empty($field))
			$index->del($data);
		else {
			$index->del($data,$field);
		}
	}
}