/**

 * Back 2 Browser Bytecode Translator

 * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>

 *

 * This program is free software: you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation, version 2 of the License.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 *

 * You should have received a copy of the GNU General Public License

 * along with this program. Look for COPYING file in the top folder.

 * If not, see http://opensource.org/licenses/GPL-2.0.

 */

package org.apidesign.bck2brwsr.demo.twitter;

import java.util.Arrays;

import java.util.List;

import org.apidesign.bck2brwsr.htmlpage.api.*;

import org.apidesign.bck2brwsr.htmlpage.api.Page;

import org.apidesign.bck2brwsr.htmlpage.api.Property;

import org.apidesign.bck2brwsr.htmlpage.api.ComputedProperty;

/** Controller class for access to Twitter.

 * 

 * @author Jaroslav Tulach

 */

@Page(xhtml="index.html", className="TwitterModel", properties={

    @Property(name="savedLists", type=TwitterClient.Twttrs.class, array = true),

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

    @Property(name="modifiedList", type=TwitterClient.Twttrs.class),

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

    @Property(name="currentTweets", type=String.class, array = true)

})

public class TwitterClient {

    @Model(className = "Tweeters", properties = {

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

        @Property(name="userNames", type = String.class, array = true)

    })

    static class Twttrs {

    }

    private static Tweeters tweeters(String listName, String... userNames) {

        Tweeters t = new Tweeters();

        t.setName(listName);

        t.getUserNames().addAll(Arrays.asList(userNames));

        return t;

    }

    static {

        final TwitterModel model = new TwitterModel();

        final List<Tweeters> svdLst = model.getSavedLists();

        svdLst.add(tweeters("API Design", "JaroslavTulach"));

        svdLst.add(tweeters("Celebrities", "JohnCleese", "MCHammer", "StephenFry", "algore", "StevenSanderson"));

        svdLst.add(tweeters("Microsoft people", "BillGates", "shanselman", "ScottGu"));

        svdLst.add(tweeters("NetBeans", "GeertjanW","monacotoni", "NetBeans"));

        svdLst.add(tweeters("Tech pundits", "Scobleizer", "LeoLaporte", "techcrunch", "BoingBoing", "timoreilly", "codinghorror"));

        model.setActiveTweetersName("NetBeans");

        model.applyBindings();

    }

    @ComputedProperty

    static Tweeters activeTweeters(String activeTweetersName, List<Tweeters> savedLists, Tweeters modifiedList) {

        if (modifiedList != null && modifiedList.getName() != null) {

            if (modifiedList.getName().equals(activeTweetersName)) {

                return modifiedList;

            } else {

                modifiedList.setName(null);

            }

        }

        return findByName(savedLists, activeTweetersName);

    }

    @ComputedProperty

    static boolean hasUnsavedChanges(Tweeters modifiedList) {

        return modifiedList != null;

    }

    @ComputedProperty

    static boolean userNameToAddIsValid(String userNameToAdd, String activeTweetersName, List<Tweeters> savedLists, Tweeters modifiedList) {

        Tweeters editingList = activeTweeters(activeTweetersName, savedLists, modifiedList);

        return editingList != null && userNameToAdd != null && 

            userNameToAdd.matches("[a-zA-Z0-9_]{1,15}") &&

            !editingList.getUserNames().contains(userNameToAdd);

    }

    @OnFunction

    static void deleteList(TwitterModel model) {

        final List<Tweeters> sl = model.getSavedLists();

        sl.remove(model.getActiveTweeters());

        if (sl.isEmpty()) {

            final Tweeters t = new Tweeters();

            t.setName("New");

            sl.add(t);

        }

        model.setActiveTweetersName(sl.get(0).getName());

    }

    @OnFunction

    static void saveChanges(TwitterModel model) {

        Tweeters t = findByName(model.getSavedLists(), model.getActiveTweetersName());

        int indx = model.getSavedLists().indexOf(t);

        assert indx != -1;

        model.getSavedLists().set(indx, model.getModifiedList());

        model.setModifiedList(null);

    }

    @OnFunction

    static void addUser(TwitterModel model) {

        String n = model.getUserNameToAdd();

        findModifiedList(model).getUserNames().add(n);

    }

    @OnFunction

    static void removeUser(String data, TwitterModel model) {

        findModifiedList(model).getUserNames().remove(data);

    }

    private static Tweeters findModifiedList(TwitterModel model) {

        if (model.getModifiedList() == null || model.getModifiedList().getName() == null) {

            model.setModifiedList(model.getActiveTweeters().clone());

        }

        return model.getModifiedList();

    }

    private static Tweeters findByName(List<Tweeters> list, String name) {

        for (Tweeters l : list) {

            if (l.getName() != null && l.getName().equals(name)) {

                return l;

            }

        }

        return list.isEmpty() ? null : list.get(0);

    }

}