var productImages = [];

// Preloaded image. ID = 1720
productImages[1720] = new Image();
productImages[1720].src="/image/product/medium/grace_pearl_pen.jpg";
productImages[1720].alt = "Spotters Grace Pearl Brown with Glass Photochromic Penetrator Polarised Lenses";

         

// Preloaded image. ID = 4678
productImages[4678] = new Image();
productImages[4678].src="/image/product/medium/grace_pearl_brn.jpg";
productImages[4678].alt = "Spotters Grace Pearl Brown with Brown Polarised Lenses";

         

// Preloaded image. ID = 4679
productImages[4679] = new Image();
productImages[4679].src="/image/product/medium/grace_pearl_cop.jpg";
productImages[4679].alt = "Spotters Grace Pearl Brown with Copper Polarised Lenses";

         

// Preloaded image. ID = 4680
productImages[4680] = new Image();
productImages[4680].src="/image/product/medium/grace_pearl_gry.jpg";
productImages[4680].alt = "Spotters Grace Pearl Brown with Grey Polarised Lenses";

         
var productData = [];
var fromPrice = new Array();
var fromMemberPrice = new Array();

productData[2630] = [{16: 1225, 17: 1228}, {"price":289.50, "memberPrice":289.50,  "exception":'FALSE', "isSpecial":'FALSE', "specialPrice":289.50, "stock":0, "imageId":4678} ];
fromPrice[2630] = 289.50;
fromMemberPrice[2630] = 289.50;
productData[2634] = [{16: 1225, 17: 1234}, {"price":199.50, "memberPrice":199.50,  "exception":'FALSE', "isSpecial":'FALSE', "specialPrice":199.50, "stock":0, "imageId":4680} ];
fromPrice[2634] = 199.50;
fromMemberPrice[2634] = 199.50;
productData[2635] = [{16: 1225, 17: 1235}, {"price":199.50, "memberPrice":199.50,  "exception":'FALSE', "isSpecial":'FALSE', "specialPrice":199.50, "stock":0, "imageId":4679} ];
fromPrice[2635] = 199.50;
fromMemberPrice[2635] = 199.50;
productData[5357] = [{16: 1225, 17: 3054}, {"price":199.50, "memberPrice":199.50,  "exception":'FALSE', "isSpecial":'FALSE', "specialPrice":199.50, "stock":0, "imageId":4678} ];
fromPrice[5357] = 199.50;
fromMemberPrice[5357] = 199.50;
productData[5358] = [{16: 1225, 17: 3055}, {"price":289.50, "memberPrice":289.50,  "exception":'FALSE', "isSpecial":'FALSE', "specialPrice":289.50, "stock":0, "imageId":4680} ];
fromPrice[5358] = 289.50;
fromMemberPrice[5358] = 289.50;
productData[5359] = [{16: 1225, 17: 3056}, {"price":289.50, "memberPrice":289.50,  "exception":'FALSE', "isSpecial":'FALSE', "specialPrice":289.50, "stock":0, "imageId":1720} ];
fromPrice[5359] = 289.50;
fromMemberPrice[5359] = 289.50;
var attribSets = [16, 17];
// Find the variant selected.
function findVariant()
{
   found = false;       // Found flag.
   variantIndex = 0;   // The index of the found variant element.
   
   // This just scans for a match and if found it sets the flags and breaks.  
   // If one mismatch is detected it just breaks the loop.
   for (variant in productData)    // Loop through the variant array, called 'productData'.
   {
      for (set in attribSets)   // Now loop through the sets.
      {
         // Get a refference to a attribute set select box.
         attrib = document.getElementById("attributes"+attribSets[set]);
         // Check to see if the value of that attribute select box is in the productData attribute array.
         if (productData[variant][0][attribSets[set]]==attrib.value) { found = true; } else { found = false; break; }
      }
      if (found==true) { variantIndex = variant; break; }
   }
   
   
   if (variantIndex!=0) 
   { 
      var data = productData[variantIndex][1];
      data["var_id"] = variantIndex;
      return data; 
   }
   else { return false; }  
}

// This enables and disables the submit button.
function submitButtonEnable(enabled)
{
   if (enabled==false) { document.getElementById("submitButton").disabled = true; }
   else { document.getElementById("submitButton").disabled = false; }
}

function specialRowEnabled(enable) {
   if (enable==false) {
      document.getElementById("specialRow").style.display="none";
      document.getElementById("memberPriceRow").style.display="block";
   }
   else {
      document.getElementById("specialRow").style.display="block";
      document.getElementById("memberPriceRow").style.display="none";
   }
}

// Display stock indicator
function displayStock() {
   // Don't show stock
   return true;
   
   // Get the selected variant.  
   variant = findVariant();
   if (variant["stock"] < 0) {
      stockString = "Made upon ordering";
   }
   else if (variant["stock"] ==0) {
      stockString = "Out of stock";
   }
   else if (variant["stock"] > 0) {
      stockString = "In stock &amp; ready to ship";
   }
   document.getElementById("stock").innerHTML = stockString;
}


// This is the function that gets called when the user changes the selection.
function changeVariant() { 
   
   var member = false;

   // Get the selected variant.  
   variant = findVariant();
   
	// Not a variant, show a from price and disable add to cart
	if(!variant) {
	    var toprice = getToPrice();
        var fromprice = getFromPrice();

        if(toprice == fromprice)
        {
            document.getElementById("price").innerHTML = "<strong>RRP</strong> from AUD$ " + fromprice;
        }
        else
        {
            document.getElementById("price").innerHTML = "<strong>RRP</strong> from AUD$ " + fromprice + " to AUD$ " + toprice;
        }


      if(member) {
         document.getElementById("memberPrice").innerHTML = "";
      }
      submitButtonEnable(false);
      specialRowEnabled(false);
	}
   // Check if it is an exception.
   else if (variant["exception"]=="FALSE") {  // See if it is on special.

      if (variant["isSpecial"]=="TRUE")
      {  // Display the special price with the old price with strike through font.
         document.getElementById("price").innerHTML = "<del><strong>RRP:&nbsp;</strong> AUD$ " + variant["price"].toFixed(2) + "</del>";
         document.getElementById("specialPrice").innerHTML = variant["specialPrice"].toFixed(2) + getDiscountPercentage(variant["price"], variant["specialPrice"]);
         specialRowEnabled(true);
      } // Just show the normal price.
      else
      {
         if(member) {
            document.getElementById("price").innerHTML = "<del><strong>RRP:&nbsp;</strong> AUD$ " + variant["price"].toFixed(2) + "</del>";
         }
         else {
            document.getElementById("price").innerHTML = "<strong>RRP:&nbsp;</strong> AUD$ " + variant["price"].toFixed(2);
         }
         specialRowEnabled(false);
      }
      
      if(member) {
         document.getElementById("memberPrice").innerHTML = "<strong>Member's Price:  </strong>AUD$ " + variant["memberPrice"].toFixed(2) + getDiscountPercentage(variant["price"], variant["memberPrice"]);
      }
      
      // Stock
      displayStock();
      
      
      if (variant["imageId"]!=0)
      {
         // Swapping image was confusing the users
         //swapImage(variant["imageId"]);
      }
      submitButtonEnable(true); // Enable the submit button.    
   }
   else {
      // Variant must be an exception so display some text and disable the submit button.
      document.getElementById("price").innerHTML = "Not Available";
      document.getElementById("memberPrice").innerHTML = "";
      submitButtonEnable(false);
      specialRowEnabled(false);
   }
   
}
function swapImage(image) {
   document.prodImageMain.src = productImages[image].src; 
   document.getElementById("prodImageMainAlt").innerHTML = productImages[image].alt;
}

/**
 * Sort the prices for the product
 * @return lowest price
 */
function getFromPrice() {
	fromPrice.sort(function(a,b){return a - b});
	return fromPrice[0].toFixed(2);
}

/**
* Sort the prices for the product 
* @return highest price
*/

function getToPrice() {
	fromPrice.sort(function(a,b){return b - a});
	return fromPrice[0].toFixed(2);
}

/**
 * Percentage off
 * @param price Original product price
 * @param specialPrice on special/sale price
 * @return Str Text string displaying percentage if percentage is greater than 0%
 */
function getDiscountPercentage(price, specialPrice) {
	var discount;
	
	// Make sure there is a difference in price
	if(price - specialPrice <= 0) {
		return ' (No Discount)';
	}
	
	discount = ((price - specialPrice)/price)*100;
	discount = Math.round(discount);
	
	if(discount > 0) {
		return ' (' + discount + '% off)'	
	}
	return '';
}