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 (file)
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());
+       }
+};
+
+?>
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