/*	================================================================================
	$.Example.survey
	Author: 	 Philip Poole
				
	Date:		 2010-01-30
	Description: Attemps to set the selected country in a drop down list of countries to
	 			 the user's current location. 
	================================================================================ */

(function($) {

   /**
	* <p>Attemps to set the selected country in a drop down list of countries to
	*    the user's current location.</p>
	* 
	* <p>For the script to work it is expect that each country is an option in a selected element
	* and the value for each option is the offical country code for that country.</p>
	*
	* <p>For more information view http://welovenicethings.com/XXXXX
	* 
	* <p>The script uses an API call from http://www.wipmania.com to carry out the 
	* Geolocation.</p>
	*
	* @param {string} cookieName The name of the cookie to set.
	* 
	* @example $.CountryLocator('ShippingAddress');
	* @class
	*/
	$.fn.CountryLocator = function(cookieName) {
	
		var countrySelect = $(this);
		var isClicked = false;

		//add an event to the country select so if a user chooses a country before we do we do not overwrite that 
		//choice, we also store the choice in a cookie so we do not attemp the API call next time. 
	    $(countrySelect).click(function() {
	        $.cookie(cookieName, countrySelect.val());
			isClicked = true;
	    });


		//if no cookie has been set (from a previous request) then call the API to find the users current country
	    if ($.cookie(cookieName) == null) {
	        $.getJSON('http://api.wipmania.com/jsonp?callback=?', '', function(json) {
				//if the user has already selected a country then do not overwrite that choice.
				if (!isClicked) {
	            	
					//set the country to users current location
	                $(countrySelect).children(' option[value=' + json.address.country_code + ']').attr('selected', 'selected');
	                $.cookie(cookieName, json.address.country_code);
				}
	        });
	    } else {
			var countryCode = $.cookie(cookieName);
			 $(countrySelect).children(' option[value=' + countryCode + ']').attr('selected', 'selected');
		}
	}
	
})(jQuery);