//////////////////////////////////////////////////////////////////////////////
//
// Scholar_File_Interface_Export
//
//////////////////////////////////////////////////////////////////////////////

// Class to provide options for export

var Scholar_File_Interface_Export = new function() {
	this.init = init;
	this.updateOptions = updateOptions;
	this.accept = accept;
	this.cancel = cancel;
	
	/*
	 * add options to export
	 */
	function init() {
		var addedOptions = new Object();
		
		var translators = window.arguments[0].translators;
		
		var listbox = document.getElementById("format-popup");
		var formatMenu = document.getElementById("format-menu");
		var optionsBox = document.getElementById("translator-options");
		
		// add styles to list
		for(i in translators) {
			var itemNode = document.createElement("menuitem");
			itemNode.setAttribute("label", translators[i].label);
			listbox.appendChild(itemNode);
			
			// add options
			for(var option in translators[i].displayOptions) {
				if(!addedOptions[option]) {		// if this option is not already
												// presented to the user
					// get readable name for option
					try {
						var optionLabel = Scholar.getString("exportOptions."+option);
					} catch(e) {
						var optionLabel = option;
					}
					
					// right now, option interface supports only boolean values, which
					// it interprets as checkboxes
					if(typeof(translators[i].displayOptions[option]) == "boolean") {
						var checkbox = document.createElement("checkbox");
						checkbox.setAttribute("id", "export-option-"+option);
						checkbox.setAttribute("label", optionLabel);
						optionsBox.appendChild(checkbox);
					}
					
					addedOptions[option] = true;
				}
			}
		}
		
		// select first item by default
		if(formatMenu.selectedIndex == -1) {
			formatMenu.selectedIndex = 0;
		}
		
		updateOptions();
	}
	
	/*
	 * update translator-specific options
	 */
	function updateOptions() {
		// get selected translator
		var index = document.getElementById("format-menu").selectedIndex;
		var translatorOptions = window.arguments[0].translators[index].displayOptions;
		
		var optionsBox = document.getElementById("translator-options");
		for(var i=0; i<optionsBox.childNodes.length; i++) {
			// loop through options to see which should be enabled
			var node = optionsBox.childNodes[i];
			var optionName = node.getAttribute("id").toString().substr(14);
			
			if(translatorOptions[optionName] != undefined) {
				// option should be enabled
				node.disabled = undefined;
				
				var defValue = translatorOptions[optionName];
				if(typeof(defValue) == "boolean") {
					// if option exists, enable it and set to default value
					node.setAttribute("checked", (defValue ? "true" : "false"));
				}
			} else {
				// option should be disabled and unchecked to prevent confusion
				node.disabled = true;
				node.setAttribute("checked", "false");
			}
		}
	}
	
	/*
	 * make option array reflect status
	 */
	function accept() {
		// set selected translator
		var index = document.getElementById("format-menu").selectedIndex;
		window.arguments[0].selectedTranslator = window.arguments[0].translators[index];
		
		// set options on selected translator
		var optionsAvailable = window.arguments[0].selectedTranslator.displayOptions;
		for(var option in optionsAvailable) {
			var defValue = optionsAvailable[option];
			var element = document.getElementById("export-option-"+option);
			
			if(typeof(defValue) == "boolean") {
				if(element.checked == true) {
					optionsAvailable[option] = true;
				} else {
					optionsAvailable[option] = false;
				}
			}
		}
	}
	
	/*
	 * make option array reflect status
	 */
	function cancel() {
		window.arguments[0].selectedTranslator = false;
	}
}