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/*
 * 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.server.component.MessageEvent;
import com.juick.service.MessagesService;
import com.juick.service.SubscriptionService;
import com.juick.service.TelegramService;
import com.pengrad.telegrambot.Callback;
import com.pengrad.telegrambot.TelegramBot;
import com.pengrad.telegrambot.model.request.ParseMode;
import com.pengrad.telegrambot.request.SendMessage;
import com.pengrad.telegrambot.request.SetWebhook;
import com.pengrad.telegrambot.response.SendResponse;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.ApplicationListener;
import org.springframework.stereotype.Component;

import javax.annotation.Nonnull;
import javax.annotation.PostConstruct;
import javax.inject.Inject;
import java.io.IOException;
import java.util.List;

import static com.juick.formatters.PlainTextFormatter.formatPost;
import static com.juick.formatters.PlainTextFormatter.formatUrl;

/**
 * Created by vt on 12/05/16.
 */
@Component
public class TelegramBotManager implements ApplicationListener<MessageEvent> {
    private static final Logger logger = LoggerFactory.getLogger(TelegramBotManager.class);

    private TelegramBot bot;

    @Value("${telegram_token}")
    private String telegramToken;
    @Inject
    private TelegramService telegramService;
    @Inject
    private MessagesService messagesService;
    @Inject
    private SubscriptionService subscriptionService;

    public static final String MSG_LINK = "🔗";

    @PostConstruct
    public void init() {
        if (StringUtils.isBlank(telegramToken)) {
            logger.info("telegram token is not set, exiting");
            return;
        }
        bot = new TelegramBot(telegramToken);
        try {
            SetWebhook webhook = new SetWebhook().url("https://api.juick.com/tlgmbtwbhk");
            if (!bot.execute(webhook).isOk()) {
                logger.error("error setting webhook");
            }
        } catch (Exception e) {
            logger.warn("couldn't initialize telegram bot", e);
        }
    }



    @Override
    public void onApplicationEvent(@Nonnull MessageEvent event) {
        com.juick.Message jmsg = event.getMessage();
        String msgUrl = formatUrl(jmsg);
        if (jmsg.getRid() == 0) {
            String msg = String.format("[%s](%s) %s", MSG_LINK, msgUrl, formatPost(jmsg));

            List<Long> users = telegramService.getTelegramIdentifiers(subscriptionService.getSubscribedUsers(jmsg.getUser().getUid(), jmsg.getMid()));
            List<Long> chats = telegramService.getChats();
            // registered subscribed users

            users.forEach(c -> telegramNotify(c, msg));
            // anonymous
            chats.stream().filter(u -> telegramService.getUser(u) == 0).forEach(c -> telegramNotify(c, msg));
        } else {
            // get quote
            com.juick.Message msg = messagesService.getReply(jmsg.getMid(), jmsg.getRid());
            String fmsg = String.format("[%s](%s) %s", MSG_LINK, msgUrl, formatPost(msg));
            telegramService.getTelegramIdentifiers(
                    subscriptionService.getUsersSubscribedToComments(jmsg.getMid(), jmsg.getUser().getUid())
            ).forEach(c -> telegramNotify(c, fmsg));
        }
    }

    public void telegramNotify(Long c, String msg) {
        SendMessage telegramMessage = new SendMessage(c, msg);
        telegramMessage.parseMode(ParseMode.Markdown).disableWebPagePreview(true);
        bot.execute(telegramMessage, new Callback<SendMessage, SendResponse>() {
            @Override
            public void onResponse(SendMessage request, SendResponse response) {
                logger.info("got response: {}", response.message());
            }

            @Override
            public void onFailure(SendMessage request, IOException e) {
                logger.warn("telegram failure", e);
            }
        });
    }

    public void telegramSignupNotify(Long telegramId, String hash) {
        bot.execute(new SendMessage(telegramId,
                String.format("You are subscribed to all Juick messages. " +
                        "[Create or link](http://juick.com/signup?type=durov&hash=%s) " +
                        "an existing Juick account to get your subscriptions and ability to post messages", hash))
                .parseMode(ParseMode.Markdown), new Callback<SendMessage, SendResponse>() {
            @Override
            public void onResponse(SendMessage request, SendResponse response) {
                logger.info("got response: {}", response.message());
            }

            @Override
            public void onFailure(SendMessage request, IOException e) {
                logger.warn("telegram failure", e);
            }
        });
    }

    public TelegramBot getBot() {
        return bot;
    }
}