/**

  * The MIT License (MIT)

  *

  * Copyright (C) 2013 Jaroslav Tulach <jaroslav.tulach@apidesign.org>

  *

  * Permission is hereby granted, free of charge, to any person obtaining a copy

  * of this software and associated documentation files (the "Software"), to deal

  * in the Software without restriction, including without limitation the rights

  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

  * copies of the Software, and to permit persons to whom the Software is

  * furnished to do so, subject to the following conditions:

  *

  * The above copyright notice and this permission notice shall be included in

  * all copies or substantial portions of the Software.

  *

  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

  * THE SOFTWARE.

  */

 package org.apidesign.demo.chat;

 import net.java.html.json.ComputedProperty;

 import net.java.html.json.Function;

 import net.java.html.json.Model;

 import net.java.html.json.OnReceive;

 import net.java.html.json.Property;

 import org.apidesign.demo.chat.shared.Message;

 import org.apidesign.demo.chat.shared.Query;

 /**

  *

  * @author Jaroslav Tulach <jaroslav.tulach@apidesign.org>

  */

 @Model(className = "ChatModel", targetId = "", properties = {

     @Property(name = "user", type = String.class),

     @Property(name = "comment", type = String.class),

     @Property(name = "url", type = String.class),

     @Property(name = "msgs", type = Message.class, array = true)

 })

 class ChatClient {

     @ComputedProperty

     static boolean sendEnabled(String user, String comment) {

         boolean res = user != null && comment != null && !user.isEmpty() && !comment.isEmpty();

         return res;

     }

     @Function

     static void submit(ChatModel m) {

         if (!sendEnabled(m.getUser(), m.getComment())) {

             return;

         }

         Message msg = new Message();

         msg.setUser(m.getUser());

         msg.setComment(m.getComment());

         m.postComment(m.getUrl(), msg);

     }

     static void cantChat(ChatModel model, Exception err) {

         model.getMsgs().add(new Message("System", err.getMessage(), 0));

     }

     @OnReceive(url = "{url}/chat", method = "POST", data = Message.class, onError = "cantChat")

     static void postComment(ChatModel m, Message addedMessage) {

         if (addedMessage.getComment().equals(m.getComment())) {

             m.setComment("");

         }

     }

     @OnReceive(url = "{url}/chat?since=0")

     static void initialRead(ChatModel m, Query q) {

         m.getMsgs().clear();

         m.getMsgs().addAll(q.getMessages());

         moreMessages(m);

     }

     @OnReceive(url = "{url}/chat?since={since}")

     static void updateMsgs(ChatModel m, Query q) {

         m.getMsgs().addAll(q.getMessages());

         moreMessages(m);

     }

     private static void moreMessages(ChatModel m) {

         long now = 0;

         for (Message msg : m.getMsgs()) {

             if (now < msg.getSince()) {

                 now = msg.getSince();

             }

         }

         m.updateMsgs(m.getUrl(), "" + (now + 1));

     }

     public static void onPageLoad() {

         ChatModel chm = new ChatModel();

         chm.setUrl("http://localhost:8080");

         Message m = new Message();

         m.setComment("Waiting for messages from the server...");

         m.setUser("system");

         chm.getMsgs().add(m);

         chm.applyBindings();

         chm.initialRead(chm.getUrl());        

     }

 }