/*
 * Copyright (C) 2008-2017, Juick
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package com.juick.server.api.rss;

import com.juick.Message;
import com.juick.User;
import com.juick.server.api.rss.extension.JuickModule;
import com.juick.server.api.rss.extension.JuickModuleImpl;
import com.juick.util.MessageUtils;
import com.rometools.modules.atom.modules.AtomLinkModule;
import com.rometools.modules.atom.modules.AtomLinkModuleImpl;
import com.rometools.modules.mediarss.MediaEntryModuleImpl;
import com.rometools.modules.mediarss.MediaModule;
import com.rometools.modules.mediarss.MediaModuleImpl;
import com.rometools.modules.mediarss.types.MediaContent;
import com.rometools.modules.mediarss.types.Metadata;
import com.rometools.modules.mediarss.types.Thumbnail;
import com.rometools.modules.mediarss.types.UrlReference;
import com.rometools.rome.feed.atom.Link;
import com.rometools.rome.feed.rss.*;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.web.servlet.view.feed.AbstractRssFeedView;

import javax.annotation.Nonnull;
import javax.annotation.PostConstruct;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.Collections;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * Created by vitalyster on 13.12.2016.
 */
public class MessagesView extends AbstractRssFeedView {

    private static final Logger logger = LoggerFactory.getLogger(MessagesView.class);

    @PostConstruct
    public void init() {
        setContentType("application/rss+xml;charset=UTF-8");
    }

    @SuppressWarnings("unchecked")
    @Override
    protected List<Item> buildFeedItems(@Nonnull Map<String, Object> model,
                                        @Nonnull HttpServletRequest request,
                                        @Nonnull HttpServletResponse response) {
        List<Message> msgs = (List<Message>)model.get("messages");
        return msgs.stream().map(this::createRssItem).collect(Collectors.toList());
    }

    @Override
    protected void buildFeedMetadata(Map<String, Object> model, Channel feed, HttpServletRequest request) {
        Object userObj = model.get("user");
        if (userObj != null) {
            User user = (User) userObj;
            feed.setDescription(String.format("The latest messages by @%s at Juick", user.getName()));
            String title = String.format("%s  - Juick", user.getName());
            feed.setTitle(title);
            String link = String.format("http://juick.com/%s/", user.getName());
            feed.setLink(link);
            Image rssImage = new Image();
            rssImage.setUrl(String.format("http://juick.com/a/%d.png", user.getUid()));
            rssImage.setTitle(title);
            rssImage.setLink(link);
            feed.setImage(rssImage);
            String href = String.format("http://rss.juick.com/%s/blog", user.getName());
            AtomLinkModule atomLinkModule = new AtomLinkModuleImpl();
            Link atomLink = new Link();
            atomLink.setHref(href);
            atomLink.setType("application/rss+xml");
            atomLink.setRel("self");
            atomLinkModule.setLinks(Collections.singletonList(atomLink));

            feed.getModules().add(atomLinkModule);
        } else {
            feed.setDescription("The latest messages at Juick");
            feed.setLink("http://juick.com/");
            feed.setTitle("Juick");
        }

        MediaModule mediaModule = new MediaModuleImpl();
        feed.getModules().add(mediaModule);


    }

    private Item createRssItem(Message msg) {
        Item item = new Item();
        String messageUrl = String.format("http://juick.com/%s/%d", msg.getUser().getName(), msg.getMid());
        String messageTitle = String.format("@%s: %s", msg.getUser().getName(), MessageUtils.getTagsString(msg));
        boolean isCode = msg.getTags().stream().anyMatch(t -> t.getName().equals("code"));
        String messageDescription = isCode ? MessageUtils.formatMessageCode(StringUtils.defaultString(msg.getText()))
                : MessageUtils.formatMessage(StringUtils.defaultString(msg.getText()));
        item.setLink(messageUrl);
        //item.setGuid(messageUrl);
        item.setTitle(messageTitle);
        Description description = new Description();
        description.setType("text/html");
        description.setValue(messageDescription);
        item.setDescription(description);
        item.setPubDate(Date.from(msg.getTimestamp()));
        item.setComments(messageUrl);
        msg.getTags().stream().map(t -> {
            Category category = new Category();
            category.setValue(t.getName());
            return category;
        }).forEach(c -> item.getCategories().add(c));
        JuickModule juickModule = new JuickModuleImpl();
        juickModule.setUid(msg.getUser().getUid());
        item.getModules().add(juickModule);
        if (StringUtils.isNotEmpty(msg.getAttachmentType())) {
            String type = msg.getAttachmentType().equals("jpg") ? "image/jpeg" : "image/png";
            MediaEntryModuleImpl module = new MediaEntryModuleImpl();
            try {
                UrlReference reference = new UrlReference(MessageUtils.attachmentUrl(msg));
                MediaContent mediaContent = new MediaContent(reference);
                mediaContent.setType(type);
                Metadata metadata = new Metadata();
                metadata.setThumbnail(new Thumbnail[]{new Thumbnail(new URI(msg.getPhoto().getThumbnail()))});
                module.setMetadata(metadata);
                module.setMediaContents(new MediaContent[]{mediaContent});
                item.getModules().add(module);
            } catch (URISyntaxException e) {
                logger.error("Invalid URI", e);
            }

        }
        return item;
    }
}