window.productModelObj=function(flds) {
  for (var f in flds) this[f]=flds[f];
  this.linked=[];
  this.qty=1;
  this.attrSelObj=[];
  this.imageSwapObj=[];
  this.prodSwapObj=[];
  if (this.master) this.master.linked.push(this);
}

  productModelObj.prototype.addAttrSelector=function(obj) {
    this.attrSelObj.push(obj);
    var avl=this.getAvailList(this.currAttr);
    obj.selectionChanged(this.currAttr,avl);
  };
  productModelObj.prototype.addImageSwap=function(obj) {
    this.imageSwapObj.push(obj);
  };
  productModelObj.prototype.addProductSwap=function(obj) {
    this.prodSwapObj.push(obj);
  };
  productModelObj.prototype.getAvailList=function(sll) {
    var rs={};
    var sl={};
    var unsl={};
    for (var op in this.optns) {
      rs[op]={};
      if (sll[op]==null) unsl[op]=true; else sl[op]=sll[op];
    }
    var m;
    for (var i=0;m=this.models[i];i++) {
      var mis=null;
      var ovf=false;
      for (var op in sl) if (m.attr[op]!=sl[op]) {
	if (mis==null) mis=op; else { ovf=true; break; }
      }
      if (!ovf) for (var op in this.optns) if (mis==null || mis==op) {
	if (!rs[op][m.attr[op]]) rs[op][m.attr[op]]=[];
	rs[op][m.attr[op]].push(m);
      }
      if (mis==null) {
	if (!rs[undefined]) rs[undefined]=[];
	rs[undefined].push(m);
      }
    }
    return rs;
  };
  productModelObj.prototype.getOffStock=function(lst) {
    var off={};
    for (var op in this.optns) if (lst[op]) {
      off[op]={};
      for (var attr in lst[op]) {
        var stk=0;
        for (var i=0;m=lst[op][attr][i];i++) stk+=Number(m.qty);
	if (stk<this.qty) off[op][attr]=this.qty-stk;
      }
    }
    return off;
  };
  productModelObj.prototype.previewAttr=function(optn,attr) {
    var sl={};
    for (var op in this.optns) if (op==optn && attr!=null) sl[op]=attr; else sl[op]=this.currAttr[op];
    var slm={};
    slm[optn]=attr;
    var avl=this.getAvailList(sl);
    var avm=attr==null?null:this.getAvailList(slm);
    var off=this.getOffStock(avl);
    for (var i=0;this.attrSelObj[i];i++) this.attrSelObj[i].selectionChanged(this.currAttr,avl,avm,off);
  };
  productModelObj.prototype.selectAttr=function(optn,attr) {
    if (this.optns[optn]) {
      if (this.optns[optn].values[attr]) this.currAttr[optn]=attr; else this.currAttr[optn]=undefined;
    }
    return this.master?this.master.swapAttr():this.swapAttr();
  };
  productModelObj.prototype.swapAttr=function(mpid) {
    var ac=!((this.pidElement.type=='checkbox' || this.pidElement.type=='radio') && !this.pidElement.checked);
    if (this.contentDivs) for (var i=0;this.contentDivs[i];i++) this.contentDivs[i].style.display=ac?'':'none';
    if (!ac) {
      this.modelSwap({});
      return null;
    }
    var lids=[];
    var mid;
    var avl=this.getAvailList(this.currAttr);
    if (this.linked) {
      var currid=(avl[undefined]&&avl[undefined][0])?avl[undefined][0].mid:null;
      for (var i=0;this.linked[i];i++) if (mid=this.linked[i].swapAttr(currid)) lids.push(mid);
    }
    this.linked_ids=lids;
    var off=this.getOffStock(avl);
    for (var i=0;this.attrSelObj[i];i++) this.attrSelObj[i].selectionChanged(this.currAttr,avl,null,off);
    return this.modelSwap(avl,mpid);
  };
  productModelObj.prototype.setQuantity=function(qty) {
    this.qty=isNaN(qty)?1:Number(qty);
    if (this.maxqty && this.qty>this.maxqty) this.qty=this.maxqty;
    if (this.minqty && this.qty<this.minqty) this.qty=this.minqty;
    if (this.fields.quantity) for (var i=0;this.fields.quantity[i];i++) this.fields.quantity[i].value=this.qty;
    this.selectAttr();
  };
  productModelObj.prototype.modelSwap=function(avl,mpid) {
    var mdls=avl[undefined];
    var fsl=mdls && true;
    if (!fsl) {
      var optns=[];
      for (var op in this.optns) optns.unshift(op);
      for (var i=0;optns[i]!=null;i++) {
	for (var attr in avl[optns[i]]) { mdls=avl[optns[i]][attr]; break; }
	if (mdls) break;
      }
    }
    this.pidElement.value='';
    this.toggleField('msg_unavailable',!fsl);
    this.toggleField('msg_stock',false);
    this.toggleField('msg_backorder',false);
    if (!mdls) {
      this.currPrice=0;
      return null;
    }
    var imgs=mdls[0].image['default'];
    if (this.linked_ids && mdls[0].image.linked) for (var i=0;this.linked_ids[i];i++) if (mdls[0].image.linked[this.linked_ids[i]]) imgs=mdls[0].image.linked[this.linked_ids[i]];
    for (var i=0;this.imageSwapObj[i];i++) this.imageSwapObj[i].imageSwap(imgs);
    for (var i=0;this.prodSwapObj[i];i++) this.prodSwapObj[i].productSwap(mdls[0].mid);
    var prc=(mpid && mdls[0].price.xsell && mdls[0].price.xsell[mpid])?mdls[0].price.xsell[mpid]:mdls[0].price;
    this.itemPrice={min:prc.price,max:prc.price,quantity:prc.quantity,old:prc.old};
    this.currPrice=this.displayPrice();
    this.setField('model',mdls[0].model);
    if (this.showCartButton) this.showCartButton(false);
    if (fsl && mdls.length==1) {
      if (this.qty>Number(mdls[0].qty)) {
        this.setField('msg_stockQty',mdls[0].qty);
        this.setField('msg_stockInfo',mdls[0].stockmsg?mdls[0].stockmsg:'');
        this.toggleField('msg_stock',true);
	if (!this.bkOrder) return mdls[0].mid;
      }
      if (mdls[0].date_avail) {
        this.setField('msg_backorderDate',mdls[0].date_avail);
        this.toggleField('msg_backorder',true);
      }
      if (this.showCartButton) this.showCartButton(true);
//      this.pidElement.name='products_id['+this.pid+']';
      this.pidElement.value=mdls[0].mid;
      this.attrsElement.name='attrs['+mdls[0].mid+']';
      var attrs=[];
      for (var op in mdls[0].attr) attrs.push(op+':'+mdls[0].attr[op]);
      this.attrsElement.value=attrs.join(';');
    } 
    return mdls[0].mid;
  };
  productModelObj.prototype.displayPrice=function() {
    var qcur=0;
    if (this.itemPrice.quantity) for (var q in this.itemPrice.quantity) if (Number(q)<=this.qty && Number(q)>qcur) qcur=Number(q);
    var pmin=qcur?this.itemPrice.quantity[qcur]:this.itemPrice.min;
    var pval=Number(pmin.replace(/[^\d\.]/,''));
    if (this.linked && this.linked.length>0) {
      for (var i=0;this.linked[i];i++) pval+=this.linked[i].currPrice;
      pmin=pmin.replace(/\d+(\.\d*)?/,pval.toFixed(2));
    }
    this.setField('price',(pmin!=this.models[0].price.price?'<span class="priceChanged">'+pmin+'</span>':pmin));
    if (this.itemPrice.old) this.setField('oldprice',this.itemPrice.old);
    return pval;
  };
  productModelObj.prototype.setField=function(fld,val) {
    var e;
    if (this.fields[fld]) for (var i=0;e=this.fields[fld][i];i++) {
      if (e.tagName=='INPUT') e.value=val;
      else e.innerHTML=val;
    }
  };
  productModelObj.prototype.toggleField=function(fld,show) {
    var e;
    if (this.fields[fld]) for (var i=0;e=this.fields[fld][i];i++) e.style.display=show?'':'none';
  };
  productModelObj.prototype.showCartButton=function(show) {
    var e;
    if (this.fields.cart_button) for (var i=0;e=this.fields.cart_button[i];i++) e.className=show?'':'cartButtonDisabled';
  };
  productModelObj.prototype.buyNow=function(frm) {
    if (this.pidElement.value) {
      if (frm.wishListClicked) { frm.wishListClicked=false; return true; }
      if (window.addToCart) {
        window.addToCart(frm);
	return false;
      }
      return true;
    }
    this.toggleField('msg_select',true);
    return false;
  };
  productModelObj.prototype.buildForm=function(frm) {
    var frm={'quantity':this.qty};
    frm[this.pidElement.name]=this.pidElement.value;
    frm[this.attrsElement.name]=this.attrsElement.value;
    return frm;
  };