/*
 * 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.controllers;

import com.juick.User;
import com.juick.api.ApiServer;
import com.juick.server.util.*;
import com.juick.service.MessagesService;
import com.juick.service.SubscriptionService;
import com.juick.service.UserService;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.mail.util.MimeMessageParser;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.multipart.MultipartFile;
import rocks.xmpp.addr.Jid;
import rocks.xmpp.core.stanza.model.Message;
import rocks.xmpp.extensions.nick.model.Nickname;
import rocks.xmpp.extensions.oob.model.x.OobX;

import javax.inject.Inject;
import javax.mail.Session;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.nio.charset.StandardCharsets;
import java.nio.file.Paths;
import java.util.Properties;
import java.util.UUID;

/**
 * Created by vt on 24/11/2016.
 */
@RestController
public class Post {
    private static Logger logger = LoggerFactory.getLogger(ApiServer.class);

    @Inject
    private UserService userService;
    @Inject
    private ApiServer apiServer;
    @Inject
    private MessagesService messagesService;
    @Inject
    private SubscriptionService subscriptionService;
    @Value("${upload_tmp_dir:/var/www/juick.com/i/tmp/}")
    private String tmpDir;
    @Value("${img_path:/var/www/juick.com/i/}")
    private String imgDir;

    @RequestMapping(value = "/post", method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
    @ResponseStatus(value = HttpStatus.OK)
    public void doPostMessage(
            @RequestParam String body,
            @RequestParam(required = false) String img,
            @RequestParam(required = false) MultipartFile attach) throws IOException {
        User visitor = UserUtils.getCurrentUser();

        if (visitor.isAnonymous())
            throw new HttpForbiddenException();

        if (body == null || body.length() < 1 || body.length() > 4096) {
            throw new HttpBadRequestException();
        }
        body = body.replace("\r", StringUtils.EMPTY);

        String attachmentFName = HttpUtils.receiveMultiPartFile(attach, tmpDir);

        if (StringUtils.isBlank(attachmentFName) && img != null && img.length() > 10) {
            try {
                URL imgUrl = new URL(img);
                attachmentFName = HttpUtils.downloadImage(imgUrl, tmpDir);
            } catch (Exception e) {
                logger.error("DOWNLOAD ERROR", e);
                throw new HttpBadRequestException();
            }
        }
        apiServer.processMessage(visitor, body, attachmentFName);
    }

    @RequestMapping(value = "/comment", method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
    public com.juick.Message doPostComment(
            @RequestParam(defaultValue = "0") int mid,
            @RequestParam(defaultValue = "0") int rid,
            @RequestParam String body,
            @RequestParam(required = false) String img,
            @RequestParam(required = false) MultipartFile attach)
            throws IOException {
        User visitor = UserUtils.getCurrentUser();
        int vuid = visitor.getUid();
        if (vuid == 0) {
            throw new HttpForbiddenException();
        }
        if (mid == 0) {
            throw new HttpBadRequestException();
        }
        com.juick.Message msg = messagesService.getMessage(mid);
        if (msg == null) {
            throw new HttpNotFoundException();
        }

        com.juick.Message reply = null;
        if (rid > 0) {
            reply = messagesService.getReply(mid, rid);
            if (reply == null) {
                throw new HttpNotFoundException();
            }
        }

        if (body == null || body.length() < 1 || body.length() > 4096) {
            throw new HttpBadRequestException();
        }
        body = body.replace("\r", StringUtils.EMPTY);

        if ((msg.ReadOnly && msg.getUser().getUid() != vuid) || userService.isInBLAny(msg.getUser().getUid(), vuid)
                || (reply != null && userService.isInBLAny(reply.getUser().getUid(), vuid))) {
            throw new HttpForbiddenException();
        }

        String attachmentFName = HttpUtils.receiveMultiPartFile(attach, tmpDir);

        if (StringUtils.isBlank(attachmentFName) && img != null && img.length() > 10) {
            try {
                attachmentFName = HttpUtils.downloadImage(new URL(img), tmpDir);
            } catch (Exception e) {
                logger.error("DOWNLOAD ERROR", e);
                throw new HttpBadRequestException();
            }
        }

        String attachmentType = StringUtils.isNotEmpty(attachmentFName) ? attachmentFName.substring(attachmentFName.length() - 3) : null;
        int ridnew = messagesService.createReply(mid, rid, vuid, body, attachmentType);
        subscriptionService.subscribeMessage(mid, vuid);

        com.juick.Message jmsg = messagesService.getReply(mid, ridnew);

        Message xmsg = new Message();
        xmsg.setFrom(Jid.of("juick@juick.com"));
        xmsg.setType(Message.Type.CHAT);
        xmsg.setThread("juick-" + mid);
        xmsg.addExtension(jmsg);

        String quote = reply != null ? reply.getText() : msg.getText();
        if (quote.length() >= 50) {
            quote = quote.substring(0, 47) + "...";
        }

        xmsg.addExtension(new Nickname("@" + jmsg.getUser().getName()));

        if (StringUtils.isNotEmpty(attachmentFName)) {
            String fname = mid + "-" + ridnew + "." + attachmentType;
            String attachmentURL = "http://i.juick.com/photos-1024/" + fname;

            ImageUtils.saveImageWithPreviews(attachmentFName, fname, tmpDir, imgDir);

            body = attachmentURL + "\n" + body;
            try {
                xmsg.addExtension(new OobX(new URI(attachmentURL)));
            } catch (URISyntaxException e) {
                logger.error("invalid uri: {}, exception {}", attachmentURL, e);
            }
        }

        xmsg.setBody("Reply by @" + jmsg.getUser().getName() + ":\n>" + quote + "\n" + body + "\n\n#" +
                mid + "/" + ridnew + " http://juick.com/" + mid + "#" + ridnew);

        xmsg.setTo(Jid.of("juick@s2s.juick.com"));
        apiServer.sendMessage(xmsg);

        xmsg.setTo(Jid.of("juick@ws.juick.com"));
        apiServer.sendMessage(xmsg);

        xmsg.setTo(Jid.of("juick@push.juick.com"));
        apiServer.sendMessage(xmsg);
        return jmsg;
    }

    Session session = Session.getDefaultInstance(new Properties());

    @PostMapping("/mail")
    @ResponseStatus(value = HttpStatus.OK)
    public void processMail(InputStream data) throws Exception {
        MimeMessage msg = new MimeMessage(session, data);
        String from = msg.getFrom().length > 1 ? ((InternetAddress) msg.getSender()).getAddress()
                : ((InternetAddress) msg.getFrom()[0]).getAddress();
        logger.info("got msg from {}", from);
        User visitor = userService.getUserByEmail(from);
        if (!visitor.isAnonymous()) {
            MimeMessageParser parser = new MimeMessageParser(msg);
            parser.parse();
            final String[] body = {parser.getPlainContent()};
            if (body[0] == null) {
                parser.getAttachmentList().stream()
                        .filter(a -> a.getContentType().equals("text/plain")).findFirst()
                        .ifPresent(a -> {
                            try {
                                body[0] = IOUtils.toString(a.getInputStream(), StandardCharsets.UTF_8);
                                logger.info("got text: {}", body[0]);
                            } catch (IOException e) {
                                logger.info("attachment error: {}", e);
                            }
                        });
            }
            final String[] attachmentFName = new String[1];
            parser.getAttachmentList().stream().filter(a ->
                    a.getContentType().equals("image/jpeg") || a.getContentType().equals("image/png"))
                    .findFirst().ifPresent(a -> {
                logger.info("got attachment: {}", a.getContentType());
                String attachmentType;
                if (a.getContentType().equals("image/jpeg")) {
                    attachmentType = "jpg";
                } else {
                    attachmentType = "png";
                }
                attachmentFName[0] = DigestUtils.md5Hex(UUID.randomUUID().toString()) + "." + attachmentType;
                try {
                    logger.info("got inputstream: {}", a.getInputStream());
                    FileOutputStream fos = new FileOutputStream(Paths.get(tmpDir, attachmentFName[0]).toString());
                    IOUtils.copy(a.getInputStream(), fos);
                    fos.close();
                } catch (IOException e) {
                    logger.info("attachment error: {}", e);
                }
            });
            rocks.xmpp.core.stanza.model.Message xmsg = new rocks.xmpp.core.stanza.model.Message();
            xmsg.setType(rocks.xmpp.core.stanza.model.Message.Type.CHAT);
            xmsg.setFrom(Jid.of(String.valueOf(visitor.getUid()), "uid.juick.com", "mail"));
            xmsg.setTo(Jid.of("juick@juick.com/Juick"));
            xmsg.setBody(body[0]);
            try {
                if (StringUtils.isNotEmpty(attachmentFName[0])) {
                    String attachmentUrl = String.format("juick://%s", attachmentFName[0]);
                    xmsg.addExtension(new OobX(new URI(attachmentUrl), "!!!!Juick!!"));
                }
                apiServer.sendMessage(xmsg);
            } catch (URISyntaxException e1) {
                logger.warn("attachment error", e1);
            }
        } else {
            logger.info("not registered: {}", from);
        }
    }
}