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/*
 * Juick
 * Copyright (C) 2013, Ugnich Anton
 *
 * 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.components;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.android.gcm.server.*;
import com.juick.TokensList;
import com.notnoop.apns.APNS;
import com.notnoop.apns.ApnsService;
import org.apache.commons.lang3.StringEscapeUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.math.NumberUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.ParameterizedTypeReference;
import org.springframework.http.HttpMethod;
import org.springframework.web.client.RestTemplate;
import rocks.xmpp.core.XmppException;
import rocks.xmpp.core.session.Extension;
import rocks.xmpp.core.session.XmppSessionConfiguration;
import rocks.xmpp.extensions.component.accept.ExternalComponent;

import javax.annotation.PostConstruct;
import javax.inject.Inject;
import java.io.IOException;
import java.util.*;
import java.util.stream.Collectors;

/**
 * @author Ugnich Anton
 */
public class Notifications implements NotificationClientListener, AutoCloseable {
    private static Logger logger = LoggerFactory.getLogger(Notifications.class);

    @Inject
    private RestTemplate rest;
    @Inject
    private ExternalComponent xmpp;
    @Inject
    private Sender GCMSender;

    @Inject
    private ObjectMapper jsonMapper;

    private final Set<String> invalidGCMTokens = Collections.synchronizedSet(new HashSet<>());
    private final Set<String> invalidMPNSTokens = Collections.synchronizedSet(new HashSet<>());

    @Inject
    private MPNSClient mpnsClient;
    @Inject
    private ApnsService apns;

    @PostConstruct
    public void init() throws IOException {
        mpnsClient.authenticate();
        mpnsClient.setListener(this);
        xmpp.addInboundMessageListener(e -> {
            rocks.xmpp.core.stanza.model.Message msg = e.getMessage();
            com.juick.Message jmsg = msg.getExtension(com.juick.Message.class);
            boolean isPM = jmsg.getMid() == 0;
            boolean isReply = jmsg.getRid() > 0;
            int pmTo = NumberUtils.toInt(msg.getTo().getLocal(), 0);

            final List<TokensList> tokensList = new ArrayList<>();
            if (isPM) {
                tokensList.addAll(rest.exchange(String.format("http://api.juick.com/notifications?type=gcm&uid=%d",
                        pmTo),
                        HttpMethod.GET, null, new ParameterizedTypeReference<List<TokensList>>() {
                        }).getBody());
            } else {
                if (isReply) {
                    tokensList.addAll(rest.exchange(String.format("http://api.juick.com/notifications?type=gcm&uid=%d&mid=%d&rid=%d",
                            jmsg.getUser().getUid(), jmsg.getMid(), jmsg.getRid()),
                            HttpMethod.GET, null, new ParameterizedTypeReference<List<TokensList>>() {
                            }).getBody());
                } else {
                    tokensList.addAll(rest.exchange(String.format("http://api.juick.com/notifications?type=gcm&uid=%s&mid=%s",
                            jmsg.getUser().getUid(), jmsg.getMid()),
                            HttpMethod.GET, null, new ParameterizedTypeReference<List<TokensList>>() {
                            }).getBody());
                }
            }

            // GCM
            List<String> regids = tokensList.stream().filter(t -> t.getType().equals("gcm"))
                    .flatMap(t -> t.getTokens().stream()).collect(Collectors.toList());
            if (!regids.isEmpty()) {
                try {
                    String json = jsonMapper.writeValueAsString(jmsg);
                    logger.info(json);
                    Message message = new Message.Builder().addData("message", json).build();
                    MulticastResult result = GCMSender.send(message, regids, 3);
                    List<Result> results = result.getResults();
                    for (int i = 0; i < results.size(); i++) {
                        Result currentResult = results.get(i);
                        logger.info("RES {}: {}", i, currentResult);
                        List<String> errorCodes = Arrays.asList(Constants.ERROR_MISMATCH_SENDER_ID, Constants.ERROR_NOT_REGISTERED);
                        if (errorCodes.contains(currentResult.getErrorCodeName())) {
                            // assuming results are in order of regids
                            // http://stackoverflow.com/a/11594531/1097384
                            String currentId = regids.get(i);
                            logger.info("{} is scheduled to remove", currentId);
                            addInvalidGCMToken(currentId);
                        }
                    }
                } catch (IOException ex) {
                    logger.error(ex.getMessage(), ex);
                } catch (IllegalArgumentException err) {
                    logger.warn("Android: Invalid API Key", err);
                }
            } else {
                logger.info("GMS: no recipients");
            }

            /*** WinPhone ***/
            List<String> urls = tokensList.stream().filter(t -> t.getType().equals("mpns"))
                    .flatMap(t -> t.getTokens().stream()).collect(Collectors.toList());

            if (urls.isEmpty()) {
                logger.info("WNS: no recipients");
            } else {
                try {
                    String text1 = "@" + jmsg.getUser().getName();
                    if (!jmsg.getTags().isEmpty()) {
                        text1 += ":" + StringEscapeUtils.escapeXml11(jmsg.getTagsString());
                    }
                    String text2 = StringEscapeUtils.escapeXml11(jmsg.getText());
                    String xml = "<?xml version=\"1.0\" encoding=\"utf-8\"?>"
                            + "<toast>"
                            + "<visual>"
                            + "<binding template=\"ToastImageAndText02\">"
                            + "<image id=\"1\" src=\"http://i.juick.com/as/" + jmsg.getUser().getUid() + ".png\" />"
                            + "<text id=\"1\">" + text1 + "</text>"
                            + "<text id=\"2\">" + text2 + "</text>"
                            + "</binding>"
                            + "</visual>"
                            + "<commands>"
                            + "<command arguments=\"?mid=" + jmsg.getMid() + "\" />"
                            + "</commands>"
                            + "</toast>";
                    logger.trace(xml);
                    for (String url : urls) {
                        logger.info("WNS: {}", url);
                        mpnsClient.sendNotification(url, xml);
                    }
                } catch (IOException | IllegalStateException ex) {
                    logger.error("WNS: ", ex);
                }
            }

            /*** iOS ***/
            List<String> tokens = tokensList.stream().filter(t -> t.getType().equals("apns"))
                    .flatMap(t -> t.getTokens().stream()).collect(Collectors.toList());
            if (!tokens.isEmpty()) {
                for (String token : tokens) {
                    String payload = APNS.newPayload().alertTitle("@" + jmsg.getUser().getName()).alertBody(jmsg.getText()).build();
                    logger.info("APNS: {}", token);
                    apns.push(token, payload);
                }
            } else {
                logger.info("APNS: no recipients");
            }
        });
        try {
            xmpp.connect();
        } catch (XmppException e) {
            logger.warn("xmpp extension", e);
        }
    }

    @Override
    public void close() throws Exception {
        if (xmpp != null)
            xmpp.close();

        logger.info("ExternalComponent on notifications destroyed");
    }

    public void addInvalidGCMToken(String token) {
        synchronized (invalidGCMTokens) {
            invalidGCMTokens.add(token);
        }
    }
    public Set<String> getInvalidGCMTokens() {
        return invalidGCMTokens;
    }
    public void cleanupGCMTokens() {
        logger.info("removed {} GCM tokens", invalidGCMTokens.size());
        synchronized (invalidGCMTokens) {
            invalidGCMTokens.clear();
        }
    }
    public void addInvalidMPNSToken(String token) {
        synchronized (invalidMPNSTokens) {
            invalidMPNSTokens.add(token);
        }
    }
    public Set<String> getInvalidMPNSTokens() {
        return invalidMPNSTokens;
    }
    public void cleanupMPNSTokens() {
        logger.info("removed {} MPNS tokens", invalidMPNSTokens.size());
        synchronized (invalidMPNSTokens) {
            invalidMPNSTokens.clear();
        }
    }

    @Override
    public void invalidToken(String type, String token) {
        switch (type) {
            case "mpns":
                addInvalidMPNSToken(token);
                break;
            default:
                break;
        }
    }
}