//used to stored the current items in basket, including collection name, document id and dodument title
//in the format of collection:id:[title], it is updated when the page is loaded (reloaded) or the user adds
// new items in the basket (see ygDDplayer.js). It is used to show the contents of the basket.

// note we only support favourites now, not the old drag and drop berry baskets
// berry is still used here for legacy reasons
var berryList =  new Array();
var show = false;


var countFavourites = function(callback) {
        var request_type = "GET";
    var url = gs.xsltParams.library_name + "?a=pr&rt=r&ro=1&s=GetNumFavourites&o=XML&hhf="+makeURLComponentSafe("[{\"name\":\"Cache-Control\", \"value\":\"no-cache\"}]")+"&c=";

    var responseSuccess = function(o) {
		
	var response = o.responseXML;
	var size = response.getElementsByTagName('size').item(0).getAttribute('value');
	
	var items = response.getElementsByTagName('documentNode');

	callback(items.length);
    }

    YAHOO.util.Connect.asyncRequest(request_type , url , {success: responseSuccess });
 
}


// display selected favourites (filled-in star icon) on page
var favouritesCheckout = function(){

	if ( document.getElementById('berrybasket') == null ) return;
	
	var request_type = "GET";
    var url = gs.xsltParams.library_name + "?a=pr&rt=r&ro=1&s=GetNumFavourites&o=XML&hhf="+makeURLComponentSafe("[{\"name\":\"Cache-Control\", \"value\":\"no-cache\"}]")+"&c=";

	var responseSuccess = function(o){
		
		var response = o.responseXML;
		var size = response.getElementsByTagName('size').item(0).getAttribute('value');

		var items = response.getElementsByTagName('documentNode');

		berryList = new Array();
		for (var i=0;i < items.length ; i++ ){

			var itemID = items[i].getAttribute('collection')+":"+items[i].getAttribute('name');
			var item = YAHOO.util.Dom.get(itemID);

			if (item != null){
			        item.src = gs.variables.selected_favourite_icon_url;
			        item.setAttribute("data-is-favourite","true");
			}
			berryList[berryList.length] = items[i];
		}

		// set favourite images visible
		// they are set to be invisible to prevent flickering when first loaded (see berry.css)

		var berries = document.getElementsByTagName('img');

		for (var j=0; j < berries.length; j++){
			var berry = berries[j]; 
			var parent = berry.parentNode;
			if (parent !=null && parent.id == "documentberries"){
				var root = YAHOO.util.Dom.get(berry.id+":root");
				var section = YAHOO.util.Dom.get(berry.id+":section");
				if(root!=null && root.id.indexOf(berry.id) !=-1){
					root.style.visibility ="visible" ;
				}

				if(section!=null && section.id.indexOf(berry.id) !=-1){
					section.style.visibility ="visible" ;
				}
			}

			if (berry.className && berry.className == 'pick'){
				berry.style.visibility = "visible";
				// new ygDDPlayer(berry.id,'basket',berryList); // **** can go 
			}
		}
		updateFavouritesCount();
	}

	var responseFailure = function(o){
		console.error("Berry Basket GetItems AJAX call failed:" + url);
	}

	var callback = {
		success: responseSuccess,
		failure: responseFailure
	}

	//var date = new Date();
	//url += "&rand=" + date.getTime();
	YAHOO.util.Connect.asyncRequest(request_type , url , callback);
}



function updateFavouritesCount() {
	var favouritesCountElement = YAHOO.util.Dom.get('favouritesCountDisplay');
	if ( favouritesCountElement == null ) return;
	if ( berryList.length == 0 ) {
		favouritesCountElement.innerHTML = "(0)";
	} else {
		favouritesCountElement.innerHTML = "(" + berryList.length + ")";
	}
}



function addFavourite(el){
    var addurl = gs.xsltParams.library_name + "?a=pr&rt=r&ro=1&s=AddFavourite&c=&s1.id=2&o=XML&hhf="+makeURLComponentSafe("[{\"name\":\"Cache-Control\", \"value\":\"no-cache\"}]")+"&s1.item=" + el.id;

    var request_type = "GET";
	var addSuccess = function(o){
		var result = o.responseXML;
		var items = result.getElementsByTagName('documentNode');

		if (items.length > 0){
		        // assumes that there is only 1 item to add
			var item = items[0];
			berryList[berryList.length]= item;

	                updateFavouritesCount();
		}

	}

	var addFailure = function(o){
	}

	var addcallback = {
		success:addSuccess,
		failure:addFailure
	}
	
	YAHOO.util.Connect.asyncRequest(request_type , addurl , addcallback);
}


function deleteFavourite(el){
    var delurl = gs.xsltParams.library_name + "?a=pr&rt=r&ro=1&s=DeleteFavourites&c=&o=XML&hhf="+makeURLComponentSafe("[{\"name\":\"Cache-Control\", \"value\":\"no-cache\"}]")+"&s1.items=" + el.id;

    var request_type = "GET";
	var delSuccess = function(o){

	        for (var i in berryList) {
                        var berry = berryList[i];
		        console.log(berry);
                        var id = berry.getAttribute('collection')+":"+berry.getAttribute('name');

                        if (id == el.id){
                                berryList.splice(i,1);

                                break;
                        }

                }
	        updateFavouritesCount();
	    
	}

	var delFailure = function(o){
	}

	var delcallback = {
		success:delSuccess,
		failure:delFailure
	}
	
	YAHOO.util.Connect.asyncRequest(request_type , delurl , delcallback);
}



function toggleFavourite(el)
{
    var is_favourite = el.getAttribute("data-is-favourite");
    if (is_favourite == "true") {
	deleteFavourite(el);
	el.src = gs.variables.unselected_favourite_icon_url;
	el.setAttribute("data-is-favourite","false")
    }
    else {
	addFavourite(el);
	el.src = gs.variables.selected_favourite_icon_url;
	el.setAttribute("data-is-favourite","true")
    }
}

YAHOO.util.Event.addListener(window, 'load', favouritesCheckout);
//YAHOO.util.Event.addListener(window, 'click', basketUpdate);