/**

 * 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=Tweeters.class, array = true),

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

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

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

    @Property(name="currentTweets", type=Tweet.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 {

    }

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

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

        @Property(name = "from_user_id", type = int.class),

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

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

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

    })

    static final class Twt {

        @ComputedProperty static String html(String text) {

            StringBuilder sb = new StringBuilder(320);

            for (int pos = 0;;) {

                int http = text.indexOf("http", pos);

                if (http == -1) {

                    sb.append(text.substring(pos));

                    return sb.toString();

                }

                int spc = text.indexOf(' ', http);

                if (spc == -1) {

                    spc = text.length();

                }

                sb.append(text.substring(pos, http));

                String url = text.substring(http, spc);

                sb.append("<a href='").append(url).append("'>").append(url).append("</a>");

                pos = spc;

            }

        }

        @ComputedProperty static String userUrl(String from_user) {

            return "http://twitter.com/" + from_user;

        }

    }

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

        @Property(array = true, name = "results", type = Twt.class)

    })

    public static final class TwttrQr {

    }

    @OnReceive(url="{root}/search.json?{query}&callback={me}", jsonp="me")

    static void queryTweets(TwitterModel page, TwitterQuery q) {

        page.getCurrentTweets().clear();

        page.getCurrentTweets().addAll(q.getResults());

    }

    @OnPropertyChange("activeTweetersName")

    static void changeTweetersList(TwitterModel model) {

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

        model.getActiveTweeters().clear();

        model.getActiveTweeters().addAll(people.getUserNames());

    }

    @OnPropertyChange({ "activeTweeters", "activeTweetersCount" })

    static void refreshTweets(TwitterModel model) {

        StringBuilder sb = new StringBuilder();

        sb.append("rpp=25&q=");

        String sep = "";

        for (String p : model.getActiveTweeters()) {

            sb.append(sep);

            sb.append("from:");

            sb.append(p);

            sep = " OR ";

        }

        if (!sep.isEmpty()) {

            model.queryTweets("http://search.twitter.com", sb.toString());

        }

    }

    static {

        final TwitterModel model = new TwitterModel();

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

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

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

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

        svdLst.add(newTweeters("NetBeans", "GeertjanW","monacotoni", "NetBeans", "petrjiricka"));

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

        model.setActiveTweetersName("NetBeans");

        model.applyBindings();

    }

    @ComputedProperty

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

        Tweeters tw = findByName(savedLists, activeTweetersName);

        if (activeTweeters == null) {

            return false;

        }

        return !tw.getUserNames().equals(activeTweeters);

    }

    @ComputedProperty

    static int activeTweetersCount(List<String> activeTweeters) {

        return activeTweeters.size();

    }

    @ComputedProperty

    static boolean userNameToAddIsValid(

        String userNameToAdd, String activeTweetersName, List<Tweeters> savedLists, List<String> activeTweeters

    ) {

        return userNameToAdd != null && 

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

            !activeTweeters.contains(userNameToAdd);

    }

    @OnFunction

    static void deleteList(TwitterModel model) {

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

        sl.remove(findByName(sl, model.getActiveTweetersName()));

        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);

        if (indx != -1) {

            t.setName(model.getActiveTweetersName());

            t.getUserNames().clear();

            t.getUserNames().addAll(model.getActiveTweeters());

        }

    }

    @OnFunction

    static void addUser(TwitterModel model) {

        String n = model.getUserNameToAdd();

        model.getActiveTweeters().add(n);

    }

    @OnFunction

    static void removeUser(String data, TwitterModel model) {

        model.getActiveTweeters().remove(data);

    }

    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() ? new Tweeters() : list.get(0);

    }

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

        Tweeters t = new Tweeters();

        t.setName(listName);

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

        return t;

    }

}