/*
 * Handles the display of a div showing progress in scraping, indexing, etc.
 *
 * Pass the active window into the constructor
 */
Scholar.ProgressWindow = function(_window){
	var _progressWindow = null;
	var _windowLoaded = false;
	var _windowLoading = false;
	// keep track of all of these things in case they're called before we're
	// done loading the progress window
	var _loadDescription = null;
	var _loadLines = new Array();
	var _loadIcons = new Array();
	var _loadHeadline = '';
	
	this.show = show;
	this.changeHeadline = changeHeadline;
	this.addLines = addLines;
	this.addDescription = addDescription;
	this.fade = fade;
	this.kill = kill;
	
	function show() {
		if(_windowLoading || _windowLoaded) {	// already loading or loaded
			return false;
		}
		_progressWindow = _window.openDialog("chrome://scholar/chrome/progressWindow.xul",
		                                    "", "chrome,dialog=no,titlebar=no,popup=yes");
		_progressWindow.addEventListener("load", _onWindowLoaded, false);
		_windowLoading = true;
		
		return true;
	}
	
	function changeHeadline(headline) {
		if(_windowLoaded) {
			_progressWindow.document.getElementById("zotero-progress-text-headline").value = headline;
		} else {
			_loadHeadline = headline;
		}
	}
	
	function addLines(label, icon) {
		if(_windowLoaded) {
			for(i in label) {
				var newLabel = _progressWindow.document.createElement("label");
				newLabel.setAttribute("class", "zotero-progress-item-label");
				newLabel.setAttribute("crop", "end");
				newLabel.setAttribute("value", label[i]);
				
				var newImage = _progressWindow.document.createElement("image");
				newImage.setAttribute("class", "zotero-progress-item-icon");
				newImage.setAttribute("src", icon[i]);
				
				var newHB = _progressWindow.document.createElement("hbox");
				newHB.setAttribute("class", "zotero-progress-item-hbox");
				newHB.setAttribute("valign", "center");
				newHB.appendChild(newImage);
				newHB.appendChild(newLabel);
				
				_progressWindow.document.getElementById("zotero-progress-text-box").appendChild(newHB);
			}
			
			_move();
		} else {
			_loadLines = _loadLines.concat(label);
			_loadIcons = _loadIcons.concat(icon);
		}
	}
	
	function addDescription(text) {
		if(_windowLoaded) {
			var newHB = _progressWindow.document.createElement("hbox");
			newHB.setAttribute("class", "zotero-progress-item-hbox");
			var newDescription = _progressWindow.document.createElement("description");
			newDescription.setAttribute("class", "zotero-progress-description");
			var newText = _progressWindow.document.createTextNode(text);
			
			newDescription.appendChild(newText);
			newHB.appendChild(newDescription);
			_progressWindow.document.getElementById("zotero-progress-text-box").appendChild(newHB);
			
			_move();
		} else {
			_loadDescription = text;
		}
	}
	
	function fade() {
		if(_windowLoaded || _windowLoading) {
			_window.setTimeout(_timeout, 2500);
		}
	}
	
	function kill() {
		_windowLoaded = false;
		_windowLoading = false;
		try {
			_progressWindow.close();
		} catch(ex) {}
	}
	
	function _onWindowLoaded() {
		_windowLoading = false;
		_windowLoaded = true;
		
		_move();
		// do things we delayed because the window was loading
		changeHeadline(_loadHeadline);
		addLines(_loadLines, _loadIcons);
		if(_loadDescription) {
			addDescription(_loadDescription);
		}
		
		// reset parameters
		_loadDescription = null;
		_loadLines = new Array();
		_loadIcons = new Array();
		_loadHeadline = '';
	}
	
	function _move() {
		_progressWindow.sizeToContent();
		_progressWindow.moveTo(
			_window.screenX + _window.innerWidth - _progressWindow.outerWidth - 30,
			_window.screenY + _window.innerHeight - _progressWindow.outerHeight - 10
		);
	}
	
	function _timeout() {
		kill();	// could check to see if we're really supposed to fade yet
				// (in case multiple scrapers are operating at once)
	}
}