package com.linkwerk.gwt.client;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.json.client.JSONException;
import com.google.gwt.json.client.JSONObject;
import com.google.gwt.json.client.JSONParser;
import com.google.gwt.json.client.JSONValue;
import com.google.gwt.user.client.HTTPRequest;
import com.google.gwt.user.client.ResponseTextHandler;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.ClickListener;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.RootPanel;
import com.google.gwt.user.client.ui.Widget;
import com.google.gwt.xml.client.DOMException;
import com.google.gwt.xml.client.Document;
import com.google.gwt.xml.client.Node;
import com.google.gwt.xml.client.XMLParser;

/**
 * Entry point classes define <code>onModuleLoad()</code>.
 */

public class Glueckskeks implements EntryPoint {
	
	final static String DEFAULT_MESSAGE = "keine Gluecks-Nachricht verfügbar";
	final static String READY_MESSAGE = "Ready.";
	final static String ERROR_MESSAGE = "Error.";
	final static String SEARCH_MESSAGE = "Status: Searching...";
	final static String GETTING_MESSAGE = "Getting ";
	final Label statusLabel = new Label("Status:");

	private class MyResponseTextHandler implements ResponseTextHandler {
		
		Label label;
		
		public MyResponseTextHandler(Label label) {
			this.label = label;
		}
		
		public void onCompletion(String responseText) {

			statusLabel.setText(statusLabel.getText() + GETTING_MESSAGE + "Text Message...");

			label.setText(responseText.replaceAll("\"", ""));

			statusLabel.setText(statusLabel.getText() + READY_MESSAGE);
		}
		
	}

	private class MyResponseJsonHandler implements ResponseTextHandler {
		
		Label label;
		
		public MyResponseJsonHandler(Label label) {
			this.label = label;
		}
		
		public void onCompletion(String responseText) {
			
			statusLabel.setText(statusLabel.getText() + GETTING_MESSAGE + "JSON Message...");
			
			try {
				JSONObject jsonObj = (JSONObject)JSONParser.parse(responseText);
				JSONValue messageVal = jsonObj.get("message");
				JSONValue authorVal  = jsonObj.get("author");
						
				if(messageVal != null && authorVal != null 
						&& messageVal.isString() != null && authorVal.isString() != null) {
					
					String message = messageVal.isString().stringValue();
					String author = authorVal.isString().stringValue();
					String messageComplete = message + " (" + author + ")";
	
					label.setText(messageComplete.replaceAll("\"", ""));
					statusLabel.setText(statusLabel.getText() + READY_MESSAGE);
				} else {
					throw new JSONException(); 
				}
			} catch(JSONException e) {
				label.setText(DEFAULT_MESSAGE);
				statusLabel.setText(statusLabel.getText() + ERROR_MESSAGE);
			}
			
		}
		
	}

	private class MyResponseXMLHandler implements ResponseTextHandler {
		
		Label label;
		
		public MyResponseXMLHandler(Label label) {
			this.label = label;
		}
		
		public void onCompletion(String responseText) {

			statusLabel.setText(statusLabel.getText() + GETTING_MESSAGE + "XML Message...");
			
			try {
				Document doc = XMLParser.parse(responseText);
				Node node = doc.getElementsByTagName("message").item(0);
				String message = node.getChildNodes().item(0).getNodeValue();
				
				label.setText(message);
				statusLabel.setText(statusLabel.getText() + READY_MESSAGE);
			} catch(DOMException de) {
				label.setText(DEFAULT_MESSAGE);
				statusLabel.setText(statusLabel.getText() + ERROR_MESSAGE);
			}
		}
		
	}

	
	/**
	 * This is the entry point method.
	 */
	public void onModuleLoad() {
		final Button button = new Button("Neuer Glückskeks");
		final Button buttonJson = new Button("Neuer Glückskeks (JSON)");
		final Button buttonXML = new Button("Neuer Glückskeks (XML)");
		final Label messageLabel = new Label("");

		button.addClickListener(new ClickListener() {
			public void onClick(Widget sender) {
				
				HTTPRequest.asyncGet("/code/WS/getFortuneCookieWS/python/", new MyResponseTextHandler(messageLabel));
				
				statusLabel.setText(SEARCH_MESSAGE);
			}
		});

		buttonJson.addClickListener(new ClickListener() {
			public void onClick(Widget sender) {
				
				// asyncPost als Alternative
				HTTPRequest.asyncGet("/code/WS/getFortuneCookieWS/?mimeType=application/json", new MyResponseJsonHandler(messageLabel));

				statusLabel.setText(SEARCH_MESSAGE);
			}
		});

		buttonXML.addClickListener(new ClickListener() {
			public void onClick(Widget sender) {
				
				// asyncPost als Alternative
				HTTPRequest.asyncGet("/code/WS/getFortuneCookieWS/?mimeType=text/xml", new MyResponseXMLHandler(messageLabel));

				statusLabel.setText(SEARCH_MESSAGE);
			}
		});

		RootPanel.get("fortuneStatus").add(statusLabel);
		RootPanel.get("fortuneButton").add(button);
		RootPanel.get("fortuneButtonJson").add(buttonJson);
		RootPanel.get("fortuneButtonXML").add(buttonXML);
		RootPanel.get("fortuneMessage").add(messageLabel);
		
	}
}