/*
 * 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.api;

import com.juick.Message;
import com.juick.server.component.MessageEvent;
import com.juick.service.CrosspostService;
import com.juick.util.MessageUtils;
import org.apache.commons.codec.CharEncoding;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.tuple.Pair;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.ApplicationListener;
import org.springframework.social.twitter.api.Twitter;
import org.springframework.social.twitter.api.impl.TwitterTemplate;
import org.springframework.stereotype.Component;

import javax.annotation.Nonnull;
import javax.inject.Inject;
import javax.net.ssl.HttpsURLConnection;
import java.io.OutputStreamWriter;
import java.net.URL;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;

/**
 * @author Ugnich Anton
 */
@Component
public class CrosspostManager implements ApplicationListener<MessageEvent> {
    private final static String FBURL = "https://graph.facebook.com/me/feed";
    private final static String VKURL = "https://api.vk.com/method/wall.post";

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

    @Inject
    private CrosspostService crosspostService;

    @Value("${twitter_consumer_key:}")
    private String twitter_consumer_key;
    @Value("${twitter_consumer_secret:}")
    private String twitter_consumer_secret;

    @Override
    public void onApplicationEvent(@Nonnull MessageEvent event) {
        Message msg = event.getMessage();
        if (msg.getMid() > 0 && msg.getRid() == 0) {
            if (StringUtils.isNotEmpty(crosspostService.getTwitterName(msg.getUser().getUid()))) {
                if (msg.getTags().stream().noneMatch(t -> t.getName().equals("notwitter"))) {
                    twitterPost(msg);
                }
            }
            // TODO: approve application for facebook crosspost
        }
    }

    private boolean facebookPost(final com.juick.Message jmsg) {
        String token = crosspostService.getFacebookTokens(jmsg.getUser().getUid())
                .orElse(Pair.of(StringUtils.EMPTY, StringUtils.EMPTY)).getRight();
        if (token.isEmpty()) {
            return false;
        }

        logger.info("FB: #{}", jmsg.getMid());

        String status = MessageUtils.getMessageHashTags(jmsg) + "\n" + jmsg.getText();

        boolean ret = false;
        try {
            String body = "access_token="
                    + URLEncoder.encode(token, CharEncoding.UTF_8)
                    + "&message="
                    + URLEncoder.encode(status, CharEncoding.UTF_8)
                    + "&link=http%3A%2F%2Fjuick.com%2F"
                    + jmsg.getMid();

            HttpsURLConnection conn = (HttpsURLConnection) new URL(FBURL).openConnection();
            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            conn.setRequestProperty("User-Agent", "Juick");
            conn.setRequestProperty("Content-Length", Integer.toString(body.length()));
            conn.setUseCaches(false);
            conn.setDoInput(true);
            conn.setDoOutput(true);
            conn.setRequestMethod("POST");
            conn.connect();

            OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
            wr.write(body);
            wr.close();

            ret = StringUtils.isNotEmpty(IOUtils.toString(conn.getInputStream(), StandardCharsets.UTF_8));

            conn.disconnect();
        } catch (Exception e) {
            logger.error("fbPost exception", e);
        }
        return ret;
    }

    private boolean vkontaktePost(final com.juick.Message jmsg) {
        Pair<String, String> tokens = crosspostService.getVkTokens(jmsg.getUser().getUid()).orElse(Pair.of(StringUtils.EMPTY, StringUtils.EMPTY));
        if (tokens.getLeft().isEmpty() || tokens.getRight().isEmpty()) {
            return false;
        }

        logger.info("VK: #", jmsg.getMid());

        String status = MessageUtils.getMessageHashTags(jmsg) + "\n" + jmsg.getText() + "\nhttp://juick.com/" + jmsg.getMid();

        boolean ret = false;
        try {
            String body = "owner_id=" + tokens.getLeft() + "&access_token=" + URLEncoder.encode(tokens.getRight(), CharEncoding.UTF_8) + "&from_group=1&message=" + URLEncoder.encode(status, CharEncoding.UTF_8);

            HttpsURLConnection conn = (HttpsURLConnection) new URL(VKURL).openConnection();
            conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
            conn.setRequestProperty("User-Agent", "Juick");
            conn.setRequestProperty("Content-Length", Integer.toString(body.length()));
            conn.setUseCaches(false);
            conn.setDoInput(true);
            conn.setDoOutput(true);
            conn.setRequestMethod("POST");
            conn.connect();

            OutputStreamWriter wr = new OutputStreamWriter(conn.getOutputStream());
            wr.write(body);
            wr.close();

            ret = StringUtils.isNotEmpty(IOUtils.toString(conn.getInputStream(), StandardCharsets.UTF_8));

            conn.disconnect();
        } catch (Exception e) {
            logger.error("vkPost exception", e);
        }
        return ret;
    }

    private void twitterPost(final com.juick.Message jmsg) {
        crosspostService.getTwitterToken(jmsg.getUser().getUid()).ifPresent(t -> {
            String status = MessageUtils.getMessageHashTags(jmsg) + jmsg.getText();
            if (status.length() > 255) {
                status = status.substring(0, 254) + "…";
            }
            status += " http://juick.com/" + jmsg.getMid();
            Twitter twitter = new TwitterTemplate(twitter_consumer_key, twitter_consumer_secret, t.getToken(), t.getSecret());
            twitter.timelineOperations().updateStatus(status);
        });
    }
}