<?php
/**
 * Users 用户相关操作
 */
 
class Users
{
	
	private $db;//传入PDO对象
	
	//使用到的公共变量
	public $tbl_user = "users";
	public $tbl_group = "groups";
	public $tbl_userToGroup = "usergroup";
	
	function __construct($db)
	{
		$this->db = $db;
	}
	
	//获取用户的组ID
	public function getGroup($uid=0){
		
		if(!empty($uid) && is_numeric($uid))
		{
			$sql = "SELECT gid FROM ".$this->tbl_userToGroup." WHERE uid=$uid";
			$rs = $this->db->query($sql);
			$row = $rs->fetch();
			return $row['gid'];
		}else{
			$select = $this->db->select();
			return $select  ->from($this->tbl_group)
							->order('groups.id desc');
		}
		
	}
	
	//获取组名
	public function getGroupName($gid){
		
		if(!is_numeric($gid))
		{
			return false;
		}
		
		$sql = "SELECT * FROM ".$this->tbl_group." WHERE id=$gid";
		$rs = $this->db->query($sql);
		$row = $rs->fetch();
		
		return $row['name'];
		
	}
	
	//创建用户组
	public function CreateGroup($name){
		
		$groupTable = $this->tbl_group;
		
		if(empty($name))
		{
			return false;
		}
		
		$data = array(
			"name" => $name
		);
		
		return $this->db->insert($groupTable,$data);
	}
	
	//把用户移动到组
	public function AddTo($uid,$gid){
		
		if(!is_numeric($uid) || !is_numeric($gid))
		{
			return false;
		}
		
		$sql = "SELECT * FROM ".$this->tbl_userToGroup." WHERE uid=? AND gid=?";
		
		$sth = $this->db->prepare($sql);
		
		$sth->execute(array($uid,$gid));
		
		$row = $sth->fetch();
		
		if(!empty($row['ts_created']))
		{
			$data = array(
				"uid"=>$uid,
				"gid"=>$gid
			);
			$whereSql = " uid=$uid AND gid=$gid ";
			return $this->db->update($this->tbl_userToGroup,$data,$whereSql);
		}else{
			$data = array(
				"uid"=>$uid,
				"gid"=>$gid
			);
			return $this->db->insert($this->tbl_userToGroup,$data);
		}
		
	}

}