function getPrice(size, qty) {
var returnval = 10;
switch (size) {
case '3x2': {
returnval = 8.99;
  if (qty < 25) { returnval = 8.99; break;}
  if (qty < 100) { returnval = 7.99; break;}
  if (qty < 200) { returnval = 6.99; break;}
  if (qty < 500) { returnval = 5.99; break;}
  if (qty < 1000) { returnval = 5.25; break;}
  if (qty < 100000) { returnval = 4.99; break;}
}
break;
case '3x3': {
returnval = 18.99;
  if (qty < 25) { returnval = 18.99; break;}
  if (qty < 100) { returnval = 17.99; break;}
  if (qty < 200) { returnval = 16.99; break;}
  if (qty < 500) { returnval = 15.99; break;}
  if (qty < 1000) { returnval = 14.99; break;}
  if (qty < 100000) { returnval = 13.99; break;}
}
break;
case '4x3': {
returnval = 9.99;
  if (qty < 25) { returnval = 9.99; break;}
  if (qty < 100) { returnval = 8.99; break;}
  if (qty < 200) { returnval = 7.99; break;}
  if (qty < 500) { returnval = 6.99; break;}
  if (qty < 1000) { returnval = 5.25; break;}
  if (qty < 100000) { returnval = 5.75; break;}
}
break;
case '443': {
returnval = 19.99;
}
break;
default:
break;}
return returnval;
}

var base_processing_time=12;
var processing_time=12;
var weights = new Array();
weights['3x2'] = 1.4;
weights['3x3'] = 5.6;
weights['4x3'] = 2.3;
weights['443'] = 9.2;


function serializeForm (theform) {
	var els = theform.elements;
	var len = els.length;
	var queryString = "";
	this.addField = 
		function(name,value) { 
			if (queryString.length>0) { 
				queryString += "&";
			}
			queryString += encodeURIComponent(name) + "=" + encodeURIComponent(value);
		};
	for (var i=0; i<len; i++) {
		var el = els[i];
		if (!el.disabled) {
			switch(el.type) {
				case 'text': case 'password': case 'hidden': case 'textarea': 
					this.addField(el.name,el.value);
					break;
				case 'select-one':
					if (el.selectedIndex>=0) {
						this.addField(el.name,el.options[el.selectedIndex].value);
					}
					break;
				case 'select-multiple':
					for (var j=0; j<el.options.length; j++) {
						if (el.options[j].selected) {
							this.addField(el.name,el.options[j].value);
						}
					}
					break;
				case 'checkbox': case 'radio':
					if (el.checked) {
						this.addField(el.name,el.value);
					}
					break;
			}
		}
	}
	return queryString;
}

function createXMLHttpRequest() {
   try { return new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) {}
   try { return new ActiveXObject("Microsoft.XMLHTTP"); } catch (e) {}
   try { return new XMLHttpRequest(); } catch(e) {}
   alert("XMLHttpRequest not supported");
   return null;
 }

var xhReq = createXMLHttpRequest();
var updating = 0;

function submitForm(theForm,destination) {
    xhReq.open("POST",destination,true);
    xhReq.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
    xhReq.onreadystatechange = onxhReqResponse;
    xhReq.send(serializeForm(theForm));
    return 'updating server...';
}    

function onxhReqResponse() {
    var cartform = document.getElementById('shopping_cart');
    if (xhReq.readyState != 4) { 
        return; 
    } else {
        //document.getElementById('dbg').innerHTML += xhReq.responseText;
        var discountregex = /discount:(.*)$/im;
        var match = new Array;
        match = discountregex.exec(xhReq.responseText);
        if (match.length >0) {
            var str = match[1];
            var discount = parseFloat(str);
            document.getElementById('discount_span').innerHTML = formatCurrency("$"+discount);
            if (discount > 0) {
                if (document.getElementById('coupon_validation').style.visibility == 'visible') {
                    document.getElementById("coupon_validation").innerHTML = "Applied Coupon Code!";
                }
            } else {
                if (document.getElementById('coupon_code').value != '') {
                    document.getElementById("coupon_validation").innerHTML = "Invalid Coupon Code.";
                } else {
                    document.getElementById("coupon_validation").innerHTML = "";
                }
            }
            cartform.discount.value = str;
        }
        if (!updating) {
            cart_md5 = updTotal();
        }
    }
}


function calcTax(subtotal) {
    var tax = 0;
    if (subtotal > 0) {
        var cartform = document.getElementById('shopping_cart');
        var state = cartform.state.value;
        var country = cartform.country.value;
        var caregex = /^ca$/i;
        if ((country=='United States of America') && (caregex.exec(state))) {
            tax = .0825;
        }
    }
    return tax * subtotal;
}

function get_selected_shipping_method() {
  var ship_method = "";
  var cartform = document.getElementById('shopping_cart');
  for (i=0;i<cartform.shipping_method.length;i++) {
    //alert(i+"  "+cartform.shipping_method[i].value+"  "+cartform.shipping_method[i].checked);
    var times_div = document.getElementById('times_'+(cartform.shipping_method[i].value));
    times_div.style.display = 'none';
    if (cartform.shipping_method[i].checked == true) {
      ship_method = cartform.shipping_method[i].value;
      times_div.style.display = 'block';
    }
  }
  return ship_method;
}

function calcShipping(weight) {
    var dbg = document.getElementById('dbg');
    //dbg.innerHTML = "weight: "+weight+"<br/>";
    weight = weight + package_weight(weight);
    //dbg.innerHTML += "weight: "+weight+"<br/>";

    var cartform = document.getElementById('shopping_cart');

    var shipping = 0;
    var country = cartform.country.value;

    var weight_input = cartform.weight;
    weight_input.value = weight;
    //var ship_method = cartform.shipping_method.value;
    var ship_method = get_selected_shipping_method();
    var ship_methods = get_shipping_methods(weight,country,num_books);
    //dbg.innerHTML += "ship_methods: "+ship_methods[ship_method]+"<br/>";

    set_shipping_inputs(ship_methods,ship_method);
/*
    if (ship_methods[ship_method]) {
        // dbg.innerHTML += "keeping: "+ship_method+"("+ship_methods[ship_method]+")<br/>";
    } else {
        // TODO: make this the default
        ship_method = cartform.shipping_method.value;//get_shipping_method(weight,country);
        // dbg.innerHTML += "switching to: "+ship_method+"("+ship_methods+")<br/>";
    }
 */   
    var ship_method = get_selected_shipping_method();
    var zip = cartform.zip.value;
    if (country=='United States of America') {
        if (isNaN(parseInt(zip))) {
            zip = 10010;
        }
        shipping = shipping_cost(weight,country,zip,ship_method);
    } else {
        shipping = shipping_cost(weight,country,0,ship_method);//'usps_global_express');
    }
    if (ship_method == 'usps_media') {
        shipping = 0;
    }
    return shipping;
}

function adjustDay (cday) {
    TDay = new Array('Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday');
    if (cday > 6) {
        cday -= 6;
        CurDayOw = TDay[cday-1];
        adjustDay(cday-1);
    } else {
        CurDayOw = TDay[cday];
        return true;
   }
}

function isLeapYear (Year) {
    if (((Year % 4)==0) && ((Year % 100)!=0) || ((Year % 400)==0)) {
        return true;
    } else {
        return false;
   }
}
     
function calcShippingTime(AddDays) {
    // TODO: fix for AddDays > 30

    TDate = new Date();

    var expdate = TDate.getTime()
    expdate += AddDays*24*3600*1000 //expires in 1 hour(milliseconds) 
    TDate.setTime(expdate)
    
    TDay = new Array('Sunday', 'Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday');
    TMonth = new Array('January', 'February', 'March', 'April', 'May','June', 'July', 'August', 'September', 'October', 'November', 'December');
    CurYear  = TDate.getYear();
    CurMonth = TDate.getMonth();
    CurDayOw = TDay[TDate.getDay()];
    CurDay = TDate.getDate();
    month = TMonth[CurMonth];
   
    TheDate  = CurDayOw + ', ';
    TheDate += month + ' ';
    TheDate += CurDay + ', ';
    if (CurYear<100) CurYear="19" + CurYear;
    TheDate += " "+(1900+CurYear);
       
    return TheDate; 
}

function formatCurrency(num) {

    num = num.toString().replace(/\$|\,/g,'');
    if(isNaN(num)) { 
        num = "0";
    }

    if (num == "0") {
        return "$0.00";
    } else {
        sign = (num == (num = Math.abs(num)));
        num = Math.floor(num*100+0.50000000001);
        cents = num%100;
        num = Math.floor(num/100).toString();
        if(cents<10) {
            cents = "0" + cents;
        } 
        for (var i = 0; i < Math.floor((num.length-(1+i))/3); i++)
        num = num.substring(0,num.length-(4*i+3))+','+
        num.substring(num.length-(4*i+3));
        return (((sign)?'':'-') + '$' + num + '.' + cents);
    }
}

function updCoupon() {
    new_md5 = 0;
    document.getElementById('discount_span').innerHTML = '$0.00';
    document.getElementById('coupon_validation').innerHTML = "Validating...";
    updServer();
}

function updServer() {
    //var dbg = document.getElementById('dbg');
    var retval = '';
    if (!updating) {
        if (cart_md5 == new_md5) {
            //document.getElementById('dbg').innerHTML = '';
            //dbg.innerHTML = "\n<br/>same\n<br/>";
            return;
        } else {
            cart_md5 = updTotal();
            retval = submitForm(document.getElementById('shopping_cart'),"order.php");
            new_md5 = cart_md5; 
        }
   }
   //dbg.innerHTML += retval;
   return retval;
}

 
function StopTheClock() {
    if (timerRunning) {
        clearTimeout(timerID);
    }
  timerRunning = false;
}

function StartTheTimer() {
  StopTheClock();
  updServer();
  timerRunning = true;
  timerID = self.setTimeout("StartTheTimer()", delay);
}

function decQty(id) {
    var itemqty = document.getElementById('quantity['+id+']');
    itemqty.value = parseInt(itemqty.value) - 1;
    if (parseInt(itemqty.value) < 0)  {
        itemqty.value = 0;
    }
    updQty(id,parseInt(itemqty.value));
}

function incQty(id) {
    var itemqty = document.getElementById('quantity['+id+']');
    if (isNaN(parseInt(itemqty.value))) {
        itemqty.value = 1;
    } else {
        itemqty.value = parseInt(itemqty.value) + 1;
    }
    updQty(id,parseInt(itemqty.value));
}

function updQty(id,qty) {
    new_md5 = 0;
    var itemqty = document.getElementById('quantity['+id+']');
    if (itemqty.value != '') {
      if (isNaN(parseInt(qty))) {
            qty = 0;
            itemqty.value = 0;
      } else {
        itemqty.value = parseInt(qty);
      }
      //if (!updating) {
        updServer();  
      //}
    }
}

function updTotal() {
    //updating = 1;
    /* Update the server with the new shopping cart qties */
    var elems = document.getElementsByTagName('INPUT');
    var cartform = document.getElementById('shopping_cart');
    var regex=/quantity/i;
    var idregex=/\[(\d+)\]/;
    var subtotal_amt = 0;
    var shipping_amt = 0;
    var discount_amt = 0;
    var tax_amt = 0;
    var total_amt = 0;
    var totalweight = 0;
    var md5_src = '';
    num_books = 0;

    for (i=0;i<elems.length;i++) {
      var id = elems[i].id;
      var quantity = 0;
      if (regex.test(id)) {
          quantity = parseInt(elems[i].value);
          if (quantity == 0) {
              var cart_row = document.getElementById(id.replace(/quantity/i, "cart_row1"));
              if (cart_row.style.display != 'none') {
                  var clip_name = document.getElementById(id.replace(/quantity/i, "clip_name"));
                  if (confirm("Remove "+(clip_name?clip_name.value:"this clip")+" from your cart?")) {
                      var match = new Array;
                      match = idregex.exec(clip_name.id);
                      removefromcart(parseInt(match[1]));
                  } else {
                      elems[i].value = 1;
                      quantity = 1;
                  }
              }
          }
          var costspan = document.getElementById(id.replace(/quantity/i, "costspan"));
          var itemid = document.getElementById(id.replace(/quantity/i, "item"));
          var booksize = document.getElementById(id.replace(/quantity/i, "size"));
          var bookprice = getPrice(booksize.value,quantity) * quantity;
          costspan.innerHTML = formatCurrency(bookprice);
          subtotal_amt += bookprice;
          totalweight += quantity * weights[booksize.value];
          md5_src += itemid.value + quantity;
          num_books += quantity;
        }
    }

    cartform.subtotal.value = subtotal_amt;
    var subtotalspan = document.getElementById('subtotal_span');
    var taxspan = document.getElementById('tax_span');
    var shippingspan = document.getElementById('shipping_span');
    var totalspan = document.getElementById('total');
    var economy_info_text = document.getElementById('economy_info_text');
    var couponcode = document.getElementById('coupon_code');
    var discountspan = document.getElementById('discount_span');
    discount_amt = eval(cartform.discount.value);

    //alert(discount_amt);
    
    // calculate shipping
    //alert(totalweight);
    shipping_amt = calcShipping(totalweight);
    //alert(cartform.shipping.value);
    cartform.shipping.value = shipping_amt;

    // calculate tax on adjusted subtotal
    tax_amt = calcTax(subtotal_amt-discount_amt);
    cartform.tax.value = tax_amt;

    var post_estimate = document.getElementById('post_estimate');
    var ship_method = get_selected_shipping_method();
    md5_src += ship_method;

    // add 1 day for every 500 books ordered
    processing_time  = base_processing_time + Math.round(num_books / 500);
    var ship_data;
    var country = cartform.country.value;
    if (country == 'United States of America') {
        ship_data = shipping_options.domestic[ship_method];
    } else {
        ship_data = shipping_options.international[ship_method];
    }
    // calculate delivery time
    var delivery_time = parseInt(ship_data.max_delivery_time);

    post_estimate.innerHTML = "Your order will ship on or before ";
    post_estimate.innerHTML += calcShippingTime(processing_time) + "<br/>\n";
    post_estimate.innerHTML += "via "+ship_data.name+", arriving by ";
    post_estimate.innerHTML += "<b>"+calcShippingTime(processing_time+delivery_time)+"</b>";

/*
    if (cartform.shipping_method.options[0]) {
        if (cartform.shipping_method.options[0].value == 'usps_media') {
            document.getElementById('economy_info_image').style.display='none';
            economy_info_text.innerHTML = "Your order qualifies for <b>FREE Economy Shipping!</b>";
        } else {
            if (country == 'United States of America') {
                document.getElementById('economy_info_image').style.display='block';
            } else {
                document.getElementById('economy_info_image').style.display='none';
            }
            economy_info_text.innerHTML = "";
        }
    } else {
        if (country == 'United States of America') {
            document.getElementById('economy_info_image').style.display='block';
        } else {
            document.getElementById('economy_info_image').style.display='none';
        }
        economy_info_text.innerHTML = "";
    }
*/

    // add it all up

    total_amt = subtotal_amt - discount_amt + shipping_amt + tax_amt;

    if (total_amt < 0.01) {
        total_amt = 0;
    }

    discountspan.innerHTML = formatCurrency(discount_amt);
    subtotalspan.innerHTML = formatCurrency(subtotal_amt);
    shippingspan.innerHTML = formatCurrency(shipping_amt);
    taxspan.innerHTML = formatCurrency(tax_amt);
    totalspan.innerHTML = formatCurrency(total_amt);

    if (hex_md5(md5_src) != cart_md5) {
      cart_md5 = hex_md5(md5_src);
      //dbg.innerHTML += "\n<br/>"+hex_md5(md5_src);
    } else {
      //dbg.innerHTML += "\n<br/>same";
    }

    if (totalweight == 0) {
        cart_md5 = 0;
        document.getElementById('noclips').style.display='block';
        document.getElementById('order_form').style.display='none';
    }

    //updating = 0;
}

function removefromcart(index) {
      document.getElementById("cart_row1["+index+"]").style.display = 'none';
      document.getElementById("cart_row2["+index+"]").style.display = 'none';
      document.getElementById("cart_row3["+index+"]").style.display = 'none';
      var orderform_div = document.getElementById('order_form');
      var maindiv = document.getElementById('maindiv');
      orderformdiv_h -= rowheight; maindiv_h -= rowheight;
      orderform_div.style.height = orderformdiv_h+"px";
      maindiv.style.height = maindiv_h+"px";
}

function showcoupon() {
    document.getElementById("coupon_link").style.display = 'none';
    //document.getElementById("coupon_text").style.display = 'inline';
    document.getElementById("coupon_code").style.visibility = 'visible';
    document.getElementById("coupon_validation").style.visibility = 'visible';
    document.getElementById("updateImg").style.display = 'inline';
    document.getElementById("updateBtn").style.display = 'inline';
    document.getElementById("discount_td1").style.display = 'block';
    document.getElementById("discount_td2").style.visibility = 'visible';
    document.getElementById("discount_span").style.display = 'block';
}