/**

 * 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());        

    }

}