/*
 * 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.annotation.JsonInclude;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.google.android.gcm.server.*;
import com.juick.components.mpns.MPNSError;
import com.juick.components.mpns.MPNSToken;
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.apache.http.*;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.HttpClientBuilder;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.apache.http.util.TextUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.core.ParameterizedTypeReference;
import org.springframework.core.env.Environment;
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 AutoCloseable {
    private static Logger logger = LoggerFactory.getLogger(Notifications.class);

    private final RestTemplate rest;
    private ExternalComponent xmpp;
    private final Sender GCMSender;

    private final String wns_application_sip;
    private final String wns_client_secret;
    private final String pushJid;
    private final String xmppHost;
    private final int xmppPort;
    private final String xmppPushPassword;

    private final ObjectMapper mapper;

    private final Set<String> invalidGCMTokens;
    private final Set<String> invalidMPNSTokens;

    @Inject
    private ApnsService apns;


    public Notifications(final Environment env, final RestTemplate rest) {
        this.rest = rest;
        wns_application_sip = env.getProperty("wns_application_sip", StringUtils.EMPTY);
        wns_client_secret = env.getProperty("wns_client_secret", StringUtils.EMPTY);
        GCMSender = new Sender(env.getProperty("gcm_key", StringUtils.EMPTY), Endpoint.GCM);
        pushJid = env.getProperty("push_jid");
        xmppHost = env.getProperty("xmpp_host", "localhost");
        xmppPort = NumberUtils.toInt(env.getProperty("xmpp_port"), 5347);
        xmppPushPassword = env.getProperty("push_xmpp_password", StringUtils.EMPTY);
        mapper = new ObjectMapper();
        mapper.setSerializationInclusion(JsonInclude.Include.NON_EMPTY);
        mapper.setSerializationInclusion(JsonInclude.Include.NON_NULL);
        mapper.setSerializationInclusion(JsonInclude.Include.NON_DEFAULT);
        invalidGCMTokens = Collections.synchronizedSet(new HashSet<>());
        invalidMPNSTokens = Collections.synchronizedSet(new HashSet<>());
    }

    @PostConstruct
    public void init() {
        XmppSessionConfiguration configuration = XmppSessionConfiguration.builder()
                .extensions(Extension.of(com.juick.Message.class))
                .build();
        xmpp = ExternalComponent.create(pushJid, xmppPushPassword, configuration, xmppHost, xmppPort);
        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);

            /*** ANDROID ***/
            final List<String> regids = new ArrayList<>();
            if (isPM) {
                regids.addAll(rest.exchange(String.format("http://api.juick.com/notifications?type=gcm&uid=%d",
                        pmTo),
                        HttpMethod.GET, null, new ParameterizedTypeReference<List<String>>() {
                        }).getBody());
            } else {
                regids.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<String>>() {
                        }).getBody());
            }

            if (!regids.isEmpty()) {
                try {
                    ObjectMapper messageSerializer = new ObjectMapper();
                    messageSerializer.setSerializationInclusion(JsonInclude.Include.NON_EMPTY);
                    messageSerializer.setSerializationInclusion(JsonInclude.Include.NON_NULL);
                    messageSerializer.setSerializationInclusion(JsonInclude.Include.NON_DEFAULT);
                    String json = messageSerializer.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 ***/
            final List<String> urls = new ArrayList<>();
            if (isPM) {
                urls.addAll(rest.exchange(String.format("http://api.juick.com/notifications?type=mpns&uid=%s",
                        pmTo),
                        HttpMethod.GET, null, new ParameterizedTypeReference<List<String>>() {
                        }).getBody());
            } else {
                urls.addAll(rest.exchange(String.format("http://api.juick.com/notifications?type=mpns&uid=%s&mid=%s",
                        jmsg.getUser().getUid(), jmsg.getMid()),
                        HttpMethod.GET, null, new ParameterizedTypeReference<List<String>>() {
                        }).getBody());
            }

            if (urls.isEmpty()) {
                logger.info("WNS: no recipients");
            } else {
                try {
                    String wnsToken = getWnsAccessToken();
                    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);
                        sendWNS(wnsToken, url, xml);
                    }
                } catch (IOException | IllegalStateException ex) {
                    logger.error("WNS: ", ex);
                }
            }

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

    String getWnsAccessToken() throws IOException, IllegalStateException {
        if (TextUtils.isEmpty(wns_application_sip)) {
            throw new IllegalStateException("'wns_application_sip' is not initialized");
        }
        if (TextUtils.isEmpty(wns_client_secret)) {
            throw new IllegalStateException("'wns_client_secret' is not initialized");
        }
        HttpClient client = HttpClientBuilder.create().build();
        String url = "https://login.live.com/accesstoken.srf";
        List<NameValuePair> formParams = new ArrayList<>();
        formParams.add(new BasicNameValuePair("grant_type", "client_credentials"));
        formParams.add(new BasicNameValuePair("client_id", wns_application_sip));
        formParams.add(new BasicNameValuePair("client_secret", wns_client_secret));
        formParams.add(new BasicNameValuePair("scope", "notify.windows.com"));
        UrlEncodedFormEntity entity = new UrlEncodedFormEntity(formParams, Consts.UTF_8);
        HttpPost httppost = new HttpPost(url);
        httppost.setEntity(entity);
        HttpResponse response = client.execute(httppost);
        int statusCode = response.getStatusLine().getStatusCode();
        String responseContent = EntityUtils.toString(response.getEntity(), Consts.UTF_8);
        if (statusCode != HttpStatus.SC_OK) {
            MPNSError error = mapper.readValue(responseContent, MPNSError.class);
            throw new IOException(error.getError() + ": " + error.getErrorDescription());
        }
        MPNSToken token = mapper.readValue(responseContent, MPNSToken.class);
        if (token.getTokenType().length() >= 1) {
            token.setTokenType(Character.toUpperCase(token.getTokenType().charAt(0)) + token.getTokenType().substring(1));
        }
        return token.getTokenType() + " " + token.getAccessToken();
    }

    void sendWNS(final String wnsToken, final String url, final String xml) throws IOException {
        HttpClient client = HttpClientBuilder.create().build();
        StringEntity entity = new StringEntity(xml, Consts.UTF_8);
        HttpPost httpPost = new HttpPost(url);
        httpPost.setHeader("Content-Type", "text/xml");
        httpPost.setHeader("Authorization", wnsToken);
        httpPost.setHeader("X-WNS-Type", "wns/toast");
        httpPost.setEntity(entity);
        HttpResponse response = client.execute(httpPost);
        int statusCode = response.getStatusLine().getStatusCode();
        if (statusCode != HttpStatus.SC_OK) {
            if (statusCode == HttpStatus.SC_GONE) {
                // expired
                logger.info("{} is scheduled to remove", url);
                addInvalidMPNSToken(url);
            } else {
                String headersContent = stringifyWnsHttpHeaders(response.getAllHeaders());
                throw new IOException(headersContent);
            }
        }
    }

    static String stringifyWnsHttpHeaders(final Header[] allHeaders) {
        return Arrays.stream(allHeaders)
                .filter(x -> x.getName().startsWith("X-WNS-") || x.getName().startsWith("WWW-"))
                .map(x -> x.getName() + ": " + x.getValue())
                .collect(Collectors.joining("\n"));
    }

    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();
        }
    }
}