<?
//   XML Shopping cart
// written by Riccardo Pasquini r.pasquini@www.doublet.it
// 29/11/2000 www.doublet.it/letsmeet

define("__XCART__",1);

if(!defined("__PIPE_PRICE__"))
{
      include("PipePrice.iphp");    //u can find this class at www.phpbuilder.com in the shared cod library
}

class xProduct
{
      //private
      var $m_nIndex;
      var $pID;            //    product unique id: could be the primary key of a table in a database....
      var $m_nQuantity;    //
      var $m_valCosto;     //    cost x unit

      //pubblico
      function xProduct($id,$quantita=-1,$costo_unitario=0)
      {
               $this->pID=$id;
               $this->m_nIndex=-1;
               $this->m_nQuantity=$quantita;
               $this->m_valCosto=$costo_unitario;
      }

      function xview()
      {
               $xstream="<prodotto>\n";
                         $xstream.="<indice>".$this->m_nIndex."</indice>\n";
                         $xstream.="<pid>".$this->pID."</pid>\n";
                         $xstream.="<quantita>".$this->m_nQuantity."</quantita>\n";
                         $xstream.="<uCostLit>".number_format($this->m_valCosto,0,",",".")."</uCostLit>\n";
                         $xstream.="<uCostEu>".number_format($this->m_valCosto/1936.27,2,",",".")."</uCostEu>\n";
               $xstream.="</prodotto>\n";

               return $xstream;
      }
}

class xShoppingCart
{
      //properties
      var $m_aProducts;    //list of inserted products
      var $m_nCount;       //number of inserted products
      var $m_valTotale;    //totale del carrello

      //constructors
      function xShoppingCart()
      {
               $this->m_aProducts=array();
               $this->m_nCount=0;
      }

      function xview($style=-1,$dtd=-1)    //this function generate an xml page as a returned string the first parameter is a XSL file the second is a DTD
      {
               $pipe=new PipePrice();
               $op=new Operation();  //null operation
               $pipe->addHeadOperation($op);

               //*
               $xstream="<?xml version=\"1.0\"?>\n";
               if($style!=-1)
                   $xstream.="<?xml:stylesheet href=\"$style\" type=\"text/xsl\"?>\n";
               if($dtd!=-1)
                   $xstream.="<!DOCTYPE carrello SYSTEM \"$dtd\">\n";
               //*/

               $xstream.="<carrello>\n";

                         $totale=0;
                         for($i=1;$i<=$this->m_nCount;$i++)   //per ogni prodotto
                         {
                              $xstream.=$this->m_aProducts[$i-1]->xview();
                              $totale+=($this->m_aProducts[$i-1]->m_valCosto*$this->m_aProducts[$i-1]->m_nQuantity);
                         }

                         $pipe->setStartValue($totale);
                         $totale=$pipe->getEndValue();

                         $xstream.="<totale>\n";
                                 $xstream.="<lire>".number_format($totale,0,",",".")."</lire>\n";
                                 $xstream.="<euro>".number_format($totale/1936.27,2,",",".")."</euro>\n";
                         $xstream.="</totale>\n";
               $xstream.="</carrello>\n";

               return $xstream;
      }

      function addProduct(&$pr)   //insert a new product
      {
               if($this->m_nCount==0)
                   $this->m_aProducts=array();

               $index=$this->chkCart($pr->pID);
               if($index!=-1)   // gi nel carrello
               {
                     $this->m_aProducts[$index]->m_nQuantity+=$pr->m_nQuantity;
               }
               else         //non in carrello
               {
                     $index=array_push($this->m_aProducts,$pr)-1;
                     $this->m_aProducts[$this->m_nCount]->m_nIndex=$index; //save the product position in the cart into the m_nIndex product property
                     $this->m_nCount++;
               }

               return $index;
      }

      function removeProduct($index)  //the correctness of the index will be tested outside by the method
      {
               $pr=&$this->m_aProducts[$index];

               if($this->m_nCount>1)
               {
                   if($index==$this->m_nCount-1)   //cancella l'ultimo
                   {
                       array_pop($this->m_aProducts);
                   }
                   else
                   {
                       $this->m_aProducts[$index]=&array_pop($this->m_aProducts);
                       $this->m_aProducts[$index]->m_nIndex=$index;
                   }
               }
               else
                   array_pop($this->m_aProducts);

               $this->m_nCount--;

               return $pr;
      }

      function emptyCart()
      {
               for($i=0;$i<$this->m_nCount;$i++)
                    $this->removeProduct(0);

               $this->m_nCount=0;
      }

      function changeQuantity($index,$nQuantity)   //the correctness of the index will be tested outside by the method
      {
               $this->m_aProducts[$index]->m_nQuantity=$nQuantity;

               return $this->m_aProducts[$index];
      }

      //private methods
      function chkCart($id)
      {
               for($i=0;$i<$this->m_nCount;$i++)
                    if($this->m_aProducts[$i]->pID==$id)
                        return $i;

                return -1;
      }
};
?>