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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.server.api;

import com.juick.Message;
import com.juick.Reaction;
import com.juick.Status;
import com.juick.User;
import com.juick.server.CommandsManager;
import com.juick.model.CommandResult;
import com.juick.server.util.*;
import com.juick.service.MessagesService;
import com.juick.service.SubscriptionService;
import com.juick.service.UserService;
import org.apache.commons.lang3.StringUtils;
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 javax.inject.Inject;
import javax.validation.constraints.NotNull;
import java.net.URI;
import java.net.URL;
import java.util.List;

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

    @Inject
    private UserService userService;
    @Inject
    private MessagesService messagesService;
    @Inject
    private SubscriptionService subscriptionService;
    @Value("${upload_tmp_dir:#{systemEnvironment['TEMP'] ?: '/tmp'}}")
    private String tmpDir;
    @Value("${img_path:#{systemEnvironment['TEMP'] ?: '/tmp'}}")
    private String imgDir;
    @Inject
    CommandsManager commandsManager;

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

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

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

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

        if (StringUtils.isBlank(attachmentFName.toString()) && img != null && img.length() > 10) {
            URI juickUri = URI.create(img);
            if (juickUri.getScheme().equals("juick")) {
                attachmentFName = juickUri;
            } else {
                try {
                    URL imgUrl = new URL(img);
                    attachmentFName = HttpUtils.downloadImage(imgUrl, tmpDir);
                } catch (Exception e) {
                    logger.error("DOWNLOAD ERROR", e);
                    throw new HttpBadRequestException();
                }
            }
        }
        if (StringUtils.isBlank(body) && StringUtils.isBlank(attachmentFName.toString())) {
            // Should be there for compatibility
            throw new HttpBadRequestException();
        }
        return commandsManager.processCommand(visitor, body, attachmentFName);
    }

    @RequestMapping(value = "/api/comment", method = RequestMethod.POST, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
    public CommandResult doPostComment(
            @RequestParam(defaultValue = "0") int mid,
            @RequestParam(defaultValue = "0") int rid,
            @RequestParam(required = false, defaultValue = StringUtils.EMPTY) String body,
            @RequestParam(required = false) String img,
            @RequestParam(required = false) MultipartFile attach)
            throws Exception {
        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.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();
        }

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

        if (StringUtils.isBlank(attachmentFName.toString()) && img != null && img.length() > 10) {
            try {
                attachmentFName = HttpUtils.downloadImage(new URL(img), tmpDir);
            } catch (Exception e) {
                logger.error("DOWNLOAD ERROR", e);
                throw new HttpBadRequestException();
            }
        }
        if (StringUtils.isBlank(body) && StringUtils.isBlank(attachmentFName.toString())) {
            // Should be there for compatibility
            throw new HttpBadRequestException();
        }
        return commandsManager.processCommand(visitor, String.format("#%d/%d %s", mid, rid, body),
                attachmentFName);
    }

    @PostMapping("/api/like")
    @ResponseStatus(value = HttpStatus.OK)
    public Status doPostRecomm(@RequestParam Integer mid) throws Exception {
        com.juick.User visitor = UserUtils.getCurrentUser();
        if (visitor.isAnonymous()) {
            throw new HttpForbiddenException();
        }
        com.juick.Message msg = messagesService.getMessage(mid);
        if (msg == null) {
            throw new HttpNotFoundException();
        }
        if (msg.getUser().getUid() == visitor.getUid()) {
            throw new HttpForbiddenException();
        }
        CommandResult status = commandsManager.processCommand(visitor, String.format("! #%d", mid),
                URI.create(StringUtils.EMPTY));
        return Status.getStatus(status.getText());
    }

    @PostMapping("/api/subscribe")
    @ResponseStatus(value = HttpStatus.OK)
    public Status doPostSubscribe(@RequestParam Integer mid) throws Exception {
        com.juick.User visitor = UserUtils.getCurrentUser();
        if (visitor.isAnonymous()) {
            throw new HttpForbiddenException();
        }
        com.juick.Message msg = messagesService.getMessage(mid);
        if (msg == null) {
            throw new HttpNotFoundException();
        }
        if (msg.getUser().getUid() == visitor.getUid()) {
            throw new HttpForbiddenException();
        }
        CommandResult status = commandsManager.processCommand(visitor, String.format("S #%d", mid),
                URI.create(StringUtils.EMPTY));
        return Status.getStatus(status.getText());
    }

    @GetMapping("/api/reactions")
    @ResponseStatus(value = HttpStatus.OK)
    public List<Reaction> reactionsList() {
        return messagesService.listReactions();
    }

    @PostMapping("/api/react")
    @ResponseStatus(value = HttpStatus.OK)
    public Status doPostReact(@RequestParam Integer mid,@RequestParam @NotNull int reactionId,
                              @RequestParam (required = false, defaultValue = "1") int count) {

        logger.info("got reaction with type: {}", reactionId);
        com.juick.User visitor = UserUtils.getCurrentUser();
        if (visitor.isAnonymous()) {
            throw new HttpForbiddenException();
        }
        com.juick.Message msg = messagesService.getMessage(mid);
        if (msg == null) {
            throw new HttpNotFoundException();
        }
        if (msg.getUser().getUid() == visitor.getUid()) {
            throw new HttpForbiddenException();
        }
        MessagesService.RecommendStatus recommendStatus = MessagesService.RecommendStatus.Error;
        for (int i = 0; i < count; i++)
            recommendStatus = messagesService.likeMessage(mid, visitor.getUid(),
                    reactionId);

        return  recommendStatus ==  MessagesService.RecommendStatus.Error ? Status.ERROR :Status.OK;
    }

    @PostMapping("/api/update")
    public CommandResult updateMessage(@RequestParam Integer mid,
                                 @RequestParam(required = false, defaultValue = "0") Integer rid,
                                 @RequestParam String body) {
        User visitor = UserUtils.getCurrentUser();
        User author = rid == 0 ? messagesService.getMessageAuthor(mid) : messagesService.getReply(mid, rid).getUser();
        if (visitor.equals(author)) {
            if (messagesService.updateMessage(mid, rid, body)) {
                Message result = rid == 0 ? messagesService.getMessage(mid) : messagesService.getReply(mid, rid);
                return CommandResult.build(result, "Message updated", StringUtils.EMPTY);
            }
            throw new HttpBadRequestException();
        }
        throw new HttpForbiddenException();
    }
}