var update = {
	overlay: null, title: null, description: null, progress: null,

	/* State and overlay functions */
	initOverlay: function() {
		update.overlay = loadFXML("dialog/overlay/update/update.fxml");

		// Lookup nodes
		update.title = update.overlay.lookup("#utitle");
		update.description = update.overlay.lookup("#description");
		update.progress = update.overlay.lookup("#progress");
	},

	resetOverlay: function(title) {
		update.title.setText(title);
		update.description.getStyleClass().remove("error");
		update.description.setText("...");
		update.progress.setProgress(-1.0);
	},

	setError: function(e) {
		LogHelper.error(e);

		// Set error description
		update.description.getStyleClass().add("error");
		update.description.setText(e.toString());
	},

	stateCallback: function(task, state) {
		var bps = state.getBps();
		var estimated = state.getEstimatedTime();
		var estimatedSeconds = estimated === null ? 0 : estimated.getSeconds();
		var estimatedHH = (estimatedSeconds / 3600) | 0;
		var estimatedMM = ((estimatedSeconds % 3600) / 60) | 0;
		var estimatedSS = (estimatedSeconds % 60) | 0;
		task.updateMessage(java.lang.String.format(
			"Файл: %s%n" + // File line
			"Загружено (Файл): %.2f / %.2f MiB.%n" + // File downloaded line
			"Загружено (Всего): %.2f / %.2f MiB.%n" + // Total downloaded line
			"%n" +
			"Средняя скорость: %.1f Kbps%n" + // Speed line
			"Примерно осталось: %d:%02d:%02d%n", // Estimated line

			// Formatting
			state.filePath, // File path
			state.getFileDownloadedMiB(), state.getFileSizeMiB(), // File downloaded
			state.getTotalDownloadedMiB(), state.getTotalSizeMiB(), // Total downloaded
			bps <= 0.0 ? 0.0 : bps / 1024.0, // Speed
			estimatedHH, estimatedMM, estimatedSS // Estimated (hh:mm:ss)
		));
		task.updateProgress(state.totalDownloaded, state.totalSize);
	},

	setTaskProperties: function(task, request, callback) {
		update.description.textProperty().bind(task.messageProperty());
		update.progress.progressProperty().bind(task.progressProperty());
		request.setStateCallback(function(state) update.stateCallback(task, state));
		task.setOnFailed(function(event) {
			update.description.textProperty().unbind();
			update.progress.progressProperty().unbind();
			update.setError(task.getException());
			overlay.hide(2500, null);
		});
		task.setOnSucceeded(function(event) {
			update.description.textProperty().unbind();
			update.progress.progressProperty().unbind();
			if (callback !== null) {
				callback(task.getValue());
			}
		});
	}
};

function offlineUpdateRequest(dirName, dir, matcher) {
	return function() {
		var hdir = settings.lastHDirs.get(dirName);
		if (hdir === null) {
			Request.requestError(java.lang.String.format("Директории '%s' нет в кэше", dirName));
			return;
		}
		
		// Verify dir with matcher
		var verifyMatcher = matcher === null ? null : matcher.verifyOnly();
		var currentHDir = new HashedDir(dir, verifyMatcher);
		if (!hdir.object.diff(currentHDir, verifyMatcher).isSame()) {
			Request.requestError(java.lang.String.format("Директория '%s' была изменена", dirName));
			return;
		}
		
		// Return last hdir
		return hdir;
	};
}

/* Export functions */
function makeUpdateRequest(dirName, dir, matcher, callback) {
	var request = settings.offline ? { setStateCallback: function(stateCallback) { /* Ignored */ } } :
		new UpdateRequest(dirName, dir, matcher);
	var task = settings.offline ? newTask(offlineUpdateRequest(dirName, dir, matcher)) :
		newRequestTask(request);
	
	// Set task properties and start
	update.setTaskProperties(task, request, callback);
	task.updateMessage("Состояние: Хеширование");
	task.updateProgress(-1, -1);
	startTask(task);
}