/* 
 * Shopping Cart Summary
 * 
 * Version 1.2
 * 
 */

/**
 * 
 */
function getShoppingCartSummary() {
	var mainElement;
	var summaryElement;
	
	mainElement = document.getElementById('display_cart_summary');
	
	if(mainElement == null) {
		return null;
	}

	return mainElement.innerHTML;	
}

/**
 * @return true, false, or null depending on if the cart is empty, not empty, or unknown
 */
function isShoppingCartEmpty() {
	var contents;
	
	contents = getShoppingCartSummary();
	
	if(contents == null) {
		return null;
	}

	if(contents.search('(Your shopping cart is empty)') != -1) {
		return true;
	}
	
	return false;
}

/**
 * 
 */
function getShoppingCartItems() {
	var summary;
	var result;

	summary = getShoppingCartSummary();
	
	if(summary == null) {
		return null;
	}
	
	result = summary.match(/\d+/);
	
	if(result == null) {
		return null;
	}
	
	return result[0];
}

/**
 * 
 */
function getShoppingCartTotal() {
	var summary;
	var result1;
	var result2;
	var output;

	summary = getShoppingCartSummary();
	
	if(summary == null) {
		return null;
	}
	
	//(Your shopping cart contains 1 item priced at $800.00) 
	//(Your shopping cart contains 2 items for a total cost of $920.00) 
	result1 = summary.match(/total\scost\sof\s.*\)/);
	result2 = summary.match(/priced\sat\s.*\)/);
	
	if(result1 == null && result2 == null) {
		return null;
	}
	
	if(result1 != null) {
		//total cost of text
		if(result1[0] == null || result1[0].length <= 15) {
			return null;
		}
		
		output = result1[0].substr(14, result1[0].length-15);
	}
	else {
		//priced at text
		if(result2[0] == null || result2[0].length <= 11) {
			return null;
		}
		
		output = result2[0].substr(10, result2[0].length-11);
	}
	
	return output;
}