From: konrad <konrad@6e3c4bff-ac9f-4ac1-96c5-d2ea494d3e33>
Date: Mon, 15 Oct 2007 20:31:24 +0000 (+0000)
Subject: first draft of cart class
X-Git-Url: http://git.silmor.de/gitweb/?a=commitdiff_plain;h=7b5f068c4b237da162c6414b3988bb27a5dfebab;p=konrad%2Fsmoke.git

first draft of cart class

git-svn-id: https://silmor.de/svn/softmagic/smoke/trunk@54 6e3c4bff-ac9f-4ac1-96c5-d2ea494d3e33
---

diff --git a/www/inc/cart.php b/www/inc/cart.php
new file mode 100644
index 0000000..41c8143
--- /dev/null
+++ b/www/inc/cart.php
@@ -0,0 +1,108 @@
+<?
+//
+// PHP Implementation: cart
+//
+// Description: Shopping Cart for Web-Interface
+//
+//
+// Author: Konrad Rosenbaum <konrad@silmor.de>, (C) 2007
+//
+// Copyright: See README/COPYING files that come with this distribution
+//
+//
+
+/**this class represents a bunch of tickets in the shopping cart, it is created by Cart*/
+class CartTicket
+{
+	private $cartid;
+	private $eventid;
+	private $amount;
+	
+	/**used by Cart to create the tickets, never use this directly*/
+	public function __construct($cid,$eid,$amt)
+	{
+		$this->cartid=$cid;
+		$this->eventid=$eid;
+		$this->amount=$amt;
+	}
+	
+	/**use this to increase or decrease the amount of tickets*/
+	public function changeAmount($amt)
+	{
+		global $db;
+		if($amd<=0){
+			$db->deleteRows("cart_ticket","cartid='".addslashes($this->cartid)."' and eventid=".$this->eventid);
+		}else{
+			$db->update("cart_ticket",array("amount"=>($amt+0)),"cartid='".addslashes($this->cartid)."' and eventid=".$this->eventid);
+		}
+	}
+	
+	/**use this to get the actual event*/
+	public function eventObject()
+	{
+		return new Event($this->eventid);
+	}
+};
+
+/**this class represents a shopping cart*/
+class Cart
+{
+	private $cartid=false;
+	
+	/**reloads a cart from the database, if $id is false a new one is created, use isValid() to check whether the cart really exists in the DB (it may have expired)*/
+	public function __construct($id=false)
+	{
+		global $db;
+		global $CartTimeout;
+		if($id===false){
+			$db->beginTransaction();
+			while(1){
+				//generate ID
+				$id=getRandom(128);
+				//check it does not exist
+				$res=$db->select("cart","cartid","cartid='".addslashes($id)."'");
+				if(count($res)==0){
+					$this->cartid=$id;
+					break;
+				}
+			}
+			//create entry
+			$db->insert("cart",array("cartid"=>$id,"timeout"=>(time()+$CartTimeout)));
+			$db->commitTransaction();
+		}else{
+			//check that cart exists
+			$res=$db->select("cart","cartid","cartid='".addslashes($id)."'");
+			if(count($res)>0)$this->cartid=$id;
+		}
+	}
+	
+	/**returns true if this is a valid shopping cart, if it returns false, try to create a new one*/
+	public function isValid()
+	{
+		return $this->cartid!==false;
+	}
+	
+	/**use this to get all existing tickets in this cart, then manipulate the tickets directly*/
+	public function getTickets()
+	{
+		if($this->cartid===false)return array();
+		$res=$db->select("cart_ticket","*","where cartid='".addslashed($this->cartid)."'");
+		$ret=array();
+		if(count($res)>0)
+		foreach($res as $k=>$tc)
+			$ret[]=new CartTicket($tc["cartid"],$tc["eventid"],$tc["amount"]);
+		return $ret;
+	}
+	
+	/**use this to add tickets*/
+	public function addTickets($eventid,$amount)
+	{
+		//sanity check
+		if($amount<=0)return;
+		//TODO: check that ticket can be sold
+		//insert into cart
+		$db->insert("cart_ticket",array());
+	}
+};
+
+?>
\ No newline at end of file