/* $This file is distributed under the terms of the license in /doc/license.txt$ */

/*
 * ----------------------------------------------------------------------------
 * proxyItemsPanel
 * ----------------------------------------------------------------------------
 * Display an AJAX-enabled list of proxy-related items (either proxies or 
 * profiles). 
 * 
 * The list may start out with a population of items. items may be added by 
 * selecting them in the auto-complete box. Items may be removed by clicking
 * the "remove" link next to that item.
 * 
 * A hidden field will hold the URI for each item, so when the form is submitted,
 * the controller can determine the list of items.
 * ----------------------------------------------------------------------------
 * You provide:
 *   p -- the DOM element that contains the template and the data. 
 *         It also contains the autocomplete field, with a status element and
 *         perhaps 1 or more excluded URIs
 * ----------------------------------------------------------------------------
 */
function proxyItemsPanel(panel, contextInfo)  {
	var self = this;

	this.itemData = [];

	var dataContainerElement = $("[name='proxyData']", panel).first();
	var autoCompleteField = $("input[name='proxySelectorAC']", panel).first();
	var searchStatusField = $("span[name='proxySelectorSearchStatus']", panel).first();
	var excludedUris =  [];
	$("[name='excludeUri']", panel).each(function(index) {
		excludedUris.push($(this).text());
	});

	var parseTemplate = function(dataContainer) {
		var templateDiv = $("div[name='template']", dataContainer)
		var templateHtml = templateDiv.html();
		templateDiv.remove();
		return templateHtml;
	};
	this.templateHtml = parseTemplate(dataContainerElement);

	this.displayItemData = function() {
		$(".proxyInfoElement", dataContainerElement).remove();
		
		for (i = 0; i < self.itemData.length; i++) {
			self.itemData[i].element().appendTo(dataContainerElement);
		}
	}

	var getItemData = function() {
		return self.itemData;	
	}

	this.removeItem = function(info) {
		var i;
		for (i = 0; i < self.itemData.length; i++) {
			if (self.itemData[i] === info) {
				self.itemData.splice(i, 1);
				break;
			}
		}
		self.displayItemData();
	}

	this.addItemData = function(selection) {
		var info = new itemElement(self.templateHtml, selection.uri, selection.label, 
				selection.classLabel, selection.imageUrl, self.removeItem);
        self.itemData.unshift(info);
        self.displayItemData();
        self.getAdditionalData(self, info, selection.externalAuthId)
	}

	this.getAdditionalData = function(parent, info, externalAuthId) {
		data = info
	    $.ajax({
	        url: contextInfo.ajaxUrl,
	        dataType: 'json',
	        data: {
	        	action: contextInfo.moreInfoAction,
	        	uri: info.uri
	        },
	        complete: function(xhr, status) {
	            var results = $.parseJSON(xhr.responseText);
	            if (results.length > 0) {
	                if ("classLabel" in results[0]) {
	                    info.classLabel = results[0].classLabel;
	                }
	                if ("imageUrl" in results[0]) {
	                	info.imageUrl = results[0].imageUrl;
	                }
	                self.displayItemData();
	            }
	        }
	    });
	}
	
	var parseOriginalData = function() {
		var dataDivs = $("div[name='data']", dataContainerElement)
		var data = [];
		for (i = 0; i < dataDivs.length; i++) {
			var dd = dataDivs[i];
			var uri = $("p[name='uri']", dd).text();
			var label = $("p[name='label']", dd).text();
			var classLabel = $("p[name='classLabel']", dd).text();
			var imageUrl = $("p[name='imageUrl']", dd).text();
			data.push(new itemElement(self.templateHtml, uri, label, classLabel, imageUrl, self.removeItem));
		}
		return data;
	}
	this.itemData = parseOriginalData();

	var setupAutoCompleteFields = function() {
		var parms = {
		    url: contextInfo.ajaxUrl,
		    action: contextInfo.basicInfoAction
		}
		var updateStatus = new statusFieldUpdater(searchStatusField, 3).setText;
		var autocompleteInfo = new proxyAutocomplete(parms, excludedUris, getItemData, self.addItemData, updateStatus)
	    autoCompleteField.autocomplete(autocompleteInfo);
	}
	setupAutoCompleteFields();

	self.displayItemData();
}

function statusFieldUpdater(element, minLength) {
	var emptyText = element.text();
	var moreCharsText = element.attr('moreCharsText');
	var noMatchText = element.attr('noMatchText');

	this.setText = function(searchTermLength, numberOfResults) {
		if (numberOfResults > 0) {
			element.text('');
		} else if (searchTermLength == 0) {
			element.text(emptyText);
		} else if (searchTermLength < minLength) {
			element.text(moreCharsText);
		} else {
			element.text(noMatchText);
		}
	}
}

/*
 * Execute this when the page loads.
 */
$(document).ready(function() {
	var disableFormInUnsupportedBrowsers = function() {
		var disableWrapper = $('#ie67DisableWrapper');

		// Check for unsupported browsers only if the element exists on the page
		if (disableWrapper.length) {
			if (vitro.browserUtils.isIELessThan8()) {
				disableWrapper.show();
				$('.noIE67').hide();
				return true;
			}
		}
		return false;
	};

	/* If we don't support this form in this browser, just stop here. */
	if (disableFormInUnsupportedBrowsers()) {
		return;
	}

	$("section[name='proxyProfilesPanel']").each(function(i) {
		var context = {
			baseUrl: proxyContextInfo.baseUrl,
			ajaxUrl: proxyContextInfo.ajaxUrl,
			basicInfoAction: "getAvailableProfiles",
			moreInfoAction: "moreProfileInfo"
		}
		this["proxyItemsPanel"] = new proxyItemsPanel(this, context);
	});
	
	$("section[name='proxyProxiesPanel']").each(function(i) {
		var context = {
			baseUrl: proxyContextInfo.baseUrl,
			ajaxUrl: proxyContextInfo.ajaxUrl,
			basicInfoAction: "getAvailableProxies",
			moreInfoAction: "moreProxyInfo"
		}
		this["proxyItemsPanel"] = new proxyItemsPanel(this, context);
	});
});