<?php
/**
 * Archive - 统一文档类，实现各类文档的读取和IO操作，包括新闻、帮助、想法等。
 */
 
class Archive
{
	private $db;  			//传入PDO对象
	public $ptype; 			//文档分类
	public $tbl_archives; 	//文档表
	public $tbl_categorys;	//栏目表
	public $tbl_catalog;	//文档栏目关联表
	public $tbl_tag;		//关键字表

	function __construct($db)
	{
		$this->db = $db;
		//文档的大分类
		//在数组中设置文档分类
		//"中文名称" => "数据库中标识"		
		$this->ptype = array(
			"新闻" => "news",
			"想法" => "idea",
			"帮助" => "help",
			"关于" => "about"
		);
		$this->tbl_archives = "archive";
		$this->tbl_categorys = "ar_category";
		$this->tbl_catalog = "ar_catalog";
		$this->tbl_tag = "ar_tag";
	}
	
	
	/*
	写入关系表
	不能外部调用
	*/
	private function ToCatalog($aid,$cid,$uuid='',$status=0){
		
		if(empty($aid) || !is_numeric($aid))
		{
			return false;
		}
		
		if(empty($cid) && empty($uuid))
		{
			return false;
		}
		
		$data = array(
			"aid" => $aid,
			"cid" => $cid,
			"status" => $status
		);
		
		if(!empty($uuid))
		{
			$data['uuid'] = $uuid;
		}
		
		if($this->db->insert($this->tbl_catalog,$data))
		{
			return true;
		}else{
			return false;
		}
		
	}//ToCatalog()
	
	//写入关系表，外部只能调用此接口
	public function AddToCatalog($aid,$cid,$uuid='',$status=0)
	{
		if(!is_numeric($aid))
		{
			return false;
		}
		
		if(!is_array($cid) && !is_numeric($cid))
		{
			return false;
		}
		
		if(is_array($cid) && count($cid)<1)
		{
			return false;
		}
		
		if(is_array($cid))
		{
			foreach($cid as $v)
			{
				$this->ToCatalog($aid,$v,$uuid,$status);
			}
			return true;
		}else{
			return $this->ToCatalog($aid,$cid,$uuid,$status);
		}
	}//AddToCatalog
	
	
	//删除一个关系
	function DeleteCatalog($id)
	{
		$sql = "DELETE FROM ".$this->tbl_catalog." WHERE id=$id";
		@$this->db->exec($sql);
	}
	
	
	/*
	*	更改栏目	ChangeCatalog()
	*/
	function ChangeCatalog($aid,$typeid,$uuid='',$status=0){
		
		try{
			$sql = "SELECT * FROM ar_catalog WHERE aid=$aid";
			$sth = $this->db->query($sql);
			$rows = $sth->fetchAll();
			
			$types = array();
			
			foreach($rows as $k=>$v)
			{
				$types[] = $v['cid'];
				if(!in_array($v['cid'],$typeid))
				{
					//删除一个栏目
					$this->DeleteCatalog($v['id']);
				}
			}
			
			foreach($typeid as $v)
			{
				
				if(!in_array($v,$types))
				{
					//添加一个栏目
					$this->ToCatalog($aid,$v);
				}
			}
			return true;
		}catch(Exception $e){
			return $e->getMessage();
		}

	}//ChangeCatalog
	
	//修改文档状态
	function ChangeStatus($aid,$pub){
		
		if(empty($aid) || !is_numeric($aid))
		{
			return false;
		}
		
		if(!is_bool($pub))
		{
			return false;
		}
		
		$data = array(
			"is_pub" => $pub
		);
		
		if($this->db->update($this->tbl_archives,$data,"id=$aid"))
		{
			return true;
		}else{
			return false;
		}
	}//修改文档状态
	
	//删除文档
	function DeleteArchives($aid){
		
		if(empty($aid) || !is_numeric($aid))
		{
			return false;
		}
		
		$this->DeleteTags($aid);
		
		$sql = "DELETE FROM ".$this->tbl_archives." WHERE id=$aid";
		@$this->db->exec($sql);
		
		$sql = "DELETE FROM ".$this->tbl_catalog." WHERE aid=$aid";
		@$this->db->exec($sql);

		return true;
	}//DeleteArchives
	
	//写入标签关系
	function MakeTags($aid,$keywords){
		
		$keywords = trim($keywords);
		if(empty($aid) || !is_numeric($aid))
		{
			return false;
		}
		
		if(preg_match("/,/",$keywords))
		{
			$tag = explode(",",$keywords);
		}else{
			if($this->db->insert($this->tbl_tag,array("id"=>$aid,"tag"=>$tag)))
			{
				return true;
			}else{
				return true;
			}
		}
		
		if(is_array($tag))
		{
			foreach($tag as $v)
			{
				$v = trim($v);
				if($v!='')
				{
					$this->db->insert($this->tbl_tag,array("id"=>$aid,"tag"=>$v));
				}
			}
		}
		
		return true;
		
	}//MakeTags
	
	//读取标签
	function GetTags($aid,$limit=0){
		
		if(empty($aid) || !is_numeric($aid))
		{
			return false;
		}
		
		$sql = "SELECT * FROM ".$this->tbl_tag." WHERE id=$aid";
		
		if(!empty($limit))
		{
			$sql .= " LIMIT $limit";
		}
		
		$sth = $this->db->query($sql);
		$rows = $sth->fetchAll();
		
		$keywords = array();
		foreach($rows as $k=>$v)
		{
			$keywords[] = $v['tag'];
		}
		
		return $keywords;
	}//GetTags
	
	//删除标签
	function DeleteTags($aid){
		
		if(empty($aid) || !is_numeric($aid))
		{
			return false;
		}
		
		$sql = "DELETE FROM ".$this->tbl_tag." WHERE id=$aid";
		@$this->db->exec($sql);
		return true;
	}//DeleteTags
	
	function getArchive($code='')
	{
		$sql = "select a.* from ".$this->tbl_archives." a 
				left join ".$this->tbl_catalog." ac on a.id=ac.aid 
				left join ".$this->tbl_categorys." c on ac.cid=c.id ";
		if (!empty($code)) $sql.=" where c.code='".$code."'";
		$rs=$this->db->query($sql);
		$rows=$rs->fetchAll();
		return $rows;
	}

	function getOneArchive($title,$ptype='news')
	{
		$sql="update ".$this->tbl_archives." set click=click+1";
		$this->db->query($sql);
		$sql = "select a.* from ".$this->tbl_archives." a 
				left join ".$this->tbl_catalog." ac on a.id=ac.aid 
				left join ".$this->tbl_categorys." c on ac.cid=c.id ";
		$sql.=" where a.title=? and c.ptype=?";
		$sth=$this->db->prepare($sql);
		$sth->execute(array($title,$ptype));
		$rows=$sth->fetch();
		return $rows;
		
	}
	
	/*
	* addArchive() 添加档案
	*
	* @param array $data
	*
	* @return int;
	*/
	function addArchive($data,$typeid,$keyword='')
	{
		
		$data = $this->scanField($data);
		if($data == false)
		{
			return 0;
		}
		
		//执行SQL语句后返回插入文章表的ID
		$sql = "INSERT INTO ".$this->tbl_archives." (userid,title,description,image,source,ts_published,is_pub,body) 
			VALUES (
			".$data['userid'].",
			".$data['title'].",
			".$data['description'].",
			".$data['image'].",
			".$data['source'].",
			".$data['ts_published'].",
			".$data['is_pub'].",
			".$data['body']."
			)
			RETURNING id";
		try{
			$sth = $this->db->prepare($sql);
			if($sth->execute())
			{
				$temp = $sth->fetch(PDO::FETCH_ASSOC);
				$newAid = $temp['id'];
				$News->AddToCatalog($newAid,$typeid);
				if(!empty($keyword))
				{
					$News->MakeTags($newAid,$keyword);
				}
				return $newAid;
			}else{
				return 0;
			}
		}catch(Exception $e)
		{
			return 0;
		}
	}//addArchive()
	
	/*
	* updateArchive() 更改文档
	*
	* @param array $data
	*
	* @return int
	*/
	function updateArchive($aid,$data,$typeid,$keyword='')
	{
		if(!is_numeric($aid))
		{
			return 0;
		}
		
		$data = $this->scanField($data);
		if($data == false)
		{
			return 0;
		}
		
		$sql = "UPDATE ".$this->tbl_archives." SET 
				userid=".$data['userid'].",
				title=".$data['title'].",
				description=".$data['description'].",
				image=".$data['image'].",
				source=".$data['source'].",
				ts_published=".$data['ts_published'].",
				is_pub=".$data['is_pub'].",
				body=".$data['body']."
				WHERE id=$aid";
		try{
			if($this->db->exec($sql))
			{
				if(!empty($keyword))
				{
					$this->DeleteTags($aid);
					$this->MakeTags($aid,$keyword);
				}
				$this->ChangeCatalog($aid,$typeid);
				return $aid;
			}else{
				return 0;
			}
		}catch(Exception $e)
		{
			return 0;
		}
	}
	
	//扫描字段
	function scanField($data){
		
		if(!is_array($data))
		{
			return false;
		}
		
		//对特殊字段进行特别处理
		$data['title'] = $this->replaceHtml($data['title']);
		$data['description'] = $this->replaceHtml($data['description']);
		
		//将参数过滤一遍，如果是字符型字段
		//就执行db->quote()
		foreach($data as $k=>$v)
		{
			if(!is_numeric($v) || !is_bool($v))
			{
				$data[$k] = $this->db->quote($v);
			}
		}
		
		return $data;
	}//scanField
	
	
	
	//过滤UTF-8字符的html代码
	function replaceHtml($html)
	{
		$newString = htmlentities($html, ENT_QUOTES, "UTF-8");
		return $newString;
	}
}