<?php
class Promotion
{
	private $code;
	private $id;
	private $discount_pct;
	private $discount_dol;
	private $error=false;
	private $error_msg;
	private $var_name = 'pcode';
	
	function __Construct()
	{
		// sets promo code - incoming var takes precedence (replaces) cookie
		if(isset($_COOKIE[$this->var_name]))
		{
			$this->id = $_COOKIE[$this->var_name];
			if($promotion_record = $this->get_promotion_record('id', $this->id))
			{
				$this->set_promotion_values($promotion_record);
			}
			else
			{
				unset($this->id); // may happen if promo gets removed from db
				Utilities::remove_cookie($this->var_name);
			}
		}
	}
	
	function set_cookie($num_days_to_live=0)
	{
		// default to expiring at end of session
		$ttl = ($num_days_to_live == 0) ? 0 : time()+60*60*24*$num_days_to_live;
		setcookie($this->var_name, $this->id, $ttl, '/'); 
	}
	
	function get_promotion_record($by = 'code', $search)
	{
		return(Database::ado_get_row("SELECT * FROM promotions WHERE $by='".strtoupper(trim(addslashes($search)))."'"));
	}
	
	function set_promotion_values($promotion_record)
	{
		$this->id = $promotion_record['id'];
		$this->title = $promotion_record['title'];
		$this->code = $promotion_record['code'];
		$this->discount_pct = $promotion_record['discount_pct'];
		$this->discount_dol = $promotion_record['discount_dol'];
	}
	
	function check_code($code)
	{
		$this->code = $code;
		// queries db w/ code to find out if a valid one exists. if so, is it expired or current.
		if(trim($this->code) == '')
		{
			$this->error = TRUE;
			$this->error_msg = "Please enter the code";
		}
		else
		{
			if($promotion_record = $this->get_promotion_record('code', $code))
			{
				if($this->is_current($promotion_record['date_end']))
				{
					$this->set_promotion_values($promotion_record);
					$this->set_cookie();// eventually would want a db lookup for expiry
				}
				else
				{
					$this->error = TRUE;
					$this->error_msg = "This promotion has expired";
				}
			}
			else
			{
				$this->error = TRUE;
				$this->error_msg = "This code is invalid. Please try again";
			}
		}	
	}
	
	function is_current($end_date)
	{
		if(Utilities::date_in_past($end_date))
		{
			return(false);
		}
		else
		{
			return(true);
		}	
	}
	
	function get_code()
	{
		return($this->code);
	}

	function get_id()
	{
		return(isset($this->id)) ? $this->id : FALSE;
	}

	function get_discount_pct()
	{
		return(isset($this->discount_pct)) ? $this->discount_pct : FALSE;
	}

	function get_discount_dol()
	{
		return(isset($this->discount_dol)) ? $this->discount_dol : FALSE;
	}

	function is_error()
	{
		return($this->error) ? TRUE : FALSE;
	}

	function get_error_msg()
	{
		return($this->error_msg);
	}

}
?>