/*
 * 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.www.controllers;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.juick.Message;
import com.juick.User;
import com.juick.model.AnonymousUser;
import com.juick.model.CommandResult;
import com.juick.server.util.*;
import com.juick.server.www.WebApp;
import com.juick.service.*;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.text.StringEscapeUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.client.HttpClientErrorException;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.util.UriComponentsBuilder;

import javax.inject.Inject;
import java.io.IOException;
import java.net.URI;
import java.net.URL;
import java.util.stream.Collectors;

/**
 * @author Ugnich Anton
 */
@Controller
public class NewMessage {

    @Inject
    private TagService tagService;
    @Inject
    private MessagesService messagesService;
    @Inject
    private UserService userService;
    @Inject
    private SubscriptionService subscriptionService;
    @Inject
    private CrosspostService crosspostService;
    @Inject
    private PMQueriesService pmQueriesService;
    @Inject
    private WebApp webApp;
    @Inject
    private ObjectMapper jsonMapper;
    @Inject
    private ImagesService imagesService;
    @Value("${img_path:#{systemEnvironment['TEMP'] ?: '/tmp'}}")
    private String imgDir;
    @Value("${upload_tmp_dir:#{systemEnvironment['TEMP'] ?: '/tmp'}}")
    private String tmpDir;
    @Value("${api_url:http://localhost:8080}")
    private String apiUrl;
    private RestTemplate rest = new RestTemplate();

    private static final Logger logger = LoggerFactory.getLogger(NewMessage.class);

    @GetMapping("/post")
    protected String postAction(@RequestParam(required = false) String body, ModelMap model) {
        com.juick.User visitor = UserUtils.getCurrentUser();
        model.addAttribute("title", "Написать");
        model.addAttribute("headers", "");
        model.addAttribute("visitor", visitor);
        if (body == null) {
            body = StringUtils.EMPTY;
        } else {
            if (body.length() > 4096) {
                body = body.substring(0, 4096);
            }
            body = StringEscapeUtils.escapeHtml4(body);
        }
        model.addAttribute("body", body);
        model.addAttribute("visitor", visitor);
        model.addAttribute("tags", tagService.getUserTagStats(visitor.getUid()).stream()
                .sorted((e1, e2) -> Integer.compare(e2.getUsageCount(), e1.getUsageCount())).map(t -> t.getTag().getName()).collect(Collectors.toList()));
        return "views/post";
    }

    @PostMapping("/comment")
    public String doPostComment(
            @RequestParam Integer mid,
            @RequestParam(required = false, defaultValue = "0") Integer rid,
            @RequestParam(required = false, defaultValue = StringUtils.EMPTY) String body,
            @RequestParam(required = false, defaultValue = StringUtils.EMPTY) String img,
            @RequestParam(required = false) MultipartFile attach) throws IOException {
        com.juick.User visitor = UserUtils.getCurrentUser();
        if (visitor.isAnonymous() || visitor.isBanned()) {
            throw new HttpForbiddenException();
        }
        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 ((StringUtils.isEmpty(body) || body.length() > 4096) && StringUtils.isEmpty(img) && attach == null) {
            throw new HttpBadRequestException();
        }
        body = body.replace("\r", StringUtils.EMPTY);

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

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

        if (StringUtils.isBlank(attachmentFName.toString()) && 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();
            }
        }

        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
        MultiValueMap<String, String> params = new LinkedMultiValueMap<>();
        HttpEntity<MultiValueMap<String, String>> request = new HttpEntity<>(params, headers);


        params.add("body", rid == 0 ? String.format("#%d %s", mid, body) : String.format("#%d/%d %s", mid, rid, body));
        params.add("hash", userService.getHashByUID(visitor.getUid()));
        if (StringUtils.isNotEmpty(attachmentFName.toString())) {
            params.add("img", attachmentFName.toASCIIString());
        }
        URI postUri = UriComponentsBuilder.fromUriString(apiUrl).path("/api/post").build().toUri();
        ResponseEntity<CommandResult> result = rest.postForEntity(
                postUri,
                request, CommandResult.class);
        logger.info("/comment: {}", jsonMapper.writeValueAsString(result.getBody()));
        boolean wasReply = result.getBody().getNewMessage().isPresent();
        return wasReply ? "redirect:/" + msg.getUser().getName() + "/" + mid + "#" + result.getBody().getNewMessage().get().getRid() : "redirect:/" + msg.getUser().getName() + "/" + mid;
    }

    @PostMapping("/pm/send")
    public String doPostPM(@RequestParam(name = "uname", required = false) String unameParam,
                           @RequestParam String body) throws IOException {
        com.juick.User visitor = UserUtils.getCurrentUser();
        if (visitor.isAnonymous() || visitor.isBanned()) {
            throw new HttpForbiddenException();
        }
        String uname = unameParam;
        if (uname.startsWith("@")) {
            uname = uname.substring(1);
        }
        User userTo = AnonymousUser.INSTANCE;
        if (WebUtils.isUserName(uname)) {
            userTo = userService.getUserByName(uname);
        }

        if (userTo.isAnonymous() || body.length() > 10240) {
            throw new HttpBadRequestException();
        }

        if (userService.isInBLAny(userTo.getUid(), visitor.getUid())) {
            throw new HttpForbiddenException();
        }

        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
        MultiValueMap<String, String> params = new LinkedMultiValueMap<>();
        HttpEntity<MultiValueMap<String, String>> request = new HttpEntity<>(params, headers);

        params.add("body", String.format("@%s %s", userTo.getName(), body));
        params.add("hash", userService.getHashByUID(visitor.getUid()));
        URI postUri = UriComponentsBuilder.fromUriString(apiUrl).path("/api/post").build().toUri();
        ResponseEntity<CommandResult> result = rest.postForEntity(
                postUri,
                request, CommandResult.class);
        logger.info("/pm: {}", jsonMapper.writeValueAsString(result.getBody()));
        return "redirect:/pm/sent";

    }
    @PostMapping("/post2")
    public String doPostMessage(@RequestParam(name = "body", required = false) String bodyParam,
                                @RequestParam(required = false) String img,
                                @RequestParam(required = false) MultipartFile attach) throws IOException {

        com.juick.User visitor = UserUtils.getCurrentUser();
        if (visitor.isAnonymous() || visitor.isBanned()) {
            throw new HttpForbiddenException();
        }
        String body = StringUtils.isNotEmpty(bodyParam) ? bodyParam.replace("\r", StringUtils.EMPTY) : StringUtils.EMPTY;

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

        if (StringUtils.isBlank(attachmentFName.toString()) && StringUtils.isNotBlank(img)) {
            try {
                URL imgUrl = new URL(img);
                attachmentFName = HttpUtils.downloadImage(imgUrl, tmpDir);
            } catch (Exception e) {
                logger.error("DOWNLOAD ERROR", e);
                throw new HttpBadRequestException();
            }
        }
        HttpHeaders headers = new HttpHeaders();
        headers.setContentType(MediaType.APPLICATION_FORM_URLENCODED);
        MultiValueMap<String, String> params = new LinkedMultiValueMap<>();
        HttpEntity<MultiValueMap<String, String>> request = new HttpEntity<>(params, headers);

        params.add("body", body);
        params.add("hash", userService.getHashByUID(visitor.getUid()));
        if (StringUtils.isNotEmpty(attachmentFName.toString())) {
            params.add("img", attachmentFName.toASCIIString());
        }
        URI postUri = UriComponentsBuilder.fromUriString(apiUrl).path("/api/post").build().toUri();
        try {
            ResponseEntity<CommandResult> result = rest.postForEntity(postUri,
                    request, CommandResult.class);
            Message newMessage = result.getBody().getNewMessage().orElse(new Message());
            if (newMessage.getMid() > 0) {
                logger.info("/post: {}", jsonMapper.writeValueAsString(result.getBody()));
                return String.format("redirect:/%d", newMessage.getMid());
            } else {
                logger.info("{} : {}", body, result.getBody().getText());
            }
        } catch (HttpClientErrorException e) {
            logger.error("post error", e);
        }
        return "redirect:/?show=my";
    }
}