<?php

class User
{
	private $core;
	private $data;
	private $loaded = false;
	function __construct(&$core,$uid = null)
	{
		$this->core = $core;
		if(intval($uid)) { $this->load($uid); }
	}
	function load($id)
	{
		if(!intval($id)) { return false; }
		$r = $this->core->db->query_first("SELECT * FROM `users` WHERE `id`='{$id}'");
		if($r)
		{
			$this->data = $r;
			$this->loaded = true;
			return true;
		} else { return false; }
	}
	function __set($var,$val)
	{
		$this->data[$var] = $val;
		if($this->loaded)
		{
			$sql_var = $this->core->db->escape_string($var);
			$sql_val = $this->core->db->escape_string($val);
			$this->core->db->query("UPDATE `users` SET `{$var}`=`{$val}` WHERE `id`={$this->data['id']}");
		}
	}
	function save()
	{
		$updatestr = "";
		$col_ra = array();
		$val_ra = array();
		foreach($this->data as $key => $val)
		{
			$key = $db->escape_string($key);
			$val = $db->escape_string($val);
			$col_ra[] = $key;
			$val_ra[] = $key;
			$updatestr .= "`{$key}`='{$val}',";
		}
		$updatestr = substr($updatestr,0,strlen($updatestr)-1);
		if($this->data['id'])
		{
			$this->core->db->query("UPDATE `users` SET {$updatestr} WHERE `id`={$this->data['id']}");
		} else {
			$cols = "'".explode("','",$col_ra)."'";
			$vals = "'".explode("','",$val_ra)."'";
			$this->core->db->query("INSERT INTO `users` ({$cols}) VALUES ({$vals})");
			$this->data["id"] = $this->core->db->insert_id();
		}
	}
	function &__get($var)
	{
		return $this->data[$var];
	}
	function update()
	{
		$previous_data = $this->data;
		if($this->load($this->data['id']))
			{ if($previous_data === $this->data) { return false; } else { return true; } }
		else
			{ return false; }
	}
}