/*
 * 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.www.controllers;

import com.juick.Tag;
import com.juick.formatters.PlainTextFormatter;
import com.juick.server.util.HttpForbiddenException;
import com.juick.server.util.HttpNotFoundException;
import com.juick.server.util.UserUtils;
import com.juick.service.CrosspostService;
import com.juick.service.MessagesService;
import com.juick.service.UserService;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.text.StringEscapeUtils;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestParam;

import javax.inject.Inject;
import java.io.IOException;
import java.util.ArrayList;
import java.util.function.BooleanSupplier;
import java.util.List;
import java.util.stream.Collectors;

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

    @Inject
    private MessagesService messagesService;
    @Inject
    private UserService userService;
    @Inject
    private CrosspostService crosspostService;

    @GetMapping("/{uname}/{mid}")
    protected String threadAction(ModelMap model,
                                  @PathVariable String uname,
                                  @PathVariable int mid,
                                  @RequestParam(required = false, value = "view") String paramView) throws IOException {
        com.juick.User visitor = UserUtils.getCurrentUser();

        if (!messagesService.canViewThread(mid, visitor.getUid())) {
            throw new HttpForbiddenException();
        }

        com.juick.Message msg = messagesService.getMessage(mid);

        if (msg == null || msg.getUser().isBanned()) {
            throw new HttpNotFoundException();
        }

        com.juick.User user = userService.getUserByName(uname);
        if (user.getUid() == 0 || !msg.getUser().equals(user)) {
            return String.format("redirect:/%s/%d", msg.getUser().getName(), mid);
        }
        msg.VisitorCanComment = visitor.getUid() > 0;
        if (visitor.getUid() > 0) {
            boolean isMsgAuthor = visitor.getUid() == msg.getUser().getUid();
            boolean isInBL = userService.isInBL(msg.getUser().getUid(), visitor.getUid());
            msg.VisitorCanComment = isMsgAuthor || !(msg.ReadOnly || isInBL);
        }
        model.addAttribute("msg", msg);

        boolean listview = false;
        if (paramView != null) {
            if (paramView.equals("list")) {
                listview = true;
                if (visitor.getUid() > 0) {
                    userService.setUserOptionInt(visitor.getUid(), "repliesview", 1);
                }
            } else if (paramView.equals("tree") && visitor.getUid() > 0) {
                userService.setUserOptionInt(visitor.getUid(), "repliesview", 0);
            }
        } else if (visitor.getUid() > 0 && userService.getUserOptionInt(visitor.getUid(), "repliesview", 0) == 1) {
            listview = true;
        }
        model.addAttribute("listview", listview);
        String title = msg.getUser().getName() + ": " + msg.getTagsString();

        model.addAttribute("title", title);
        model.addAttribute("visitor", visitor);
        String headers = "<link rel=\"alternate\" type=\"application/rss+xml\" title=\"@" + msg.getUser().getName() + "\" href=\"//rss.juick.com/" + msg.getUser().getName() + "/blog\"/>";
        String pageUrl = "https://juick.com/" + msg.getUser().getName() + "/" + msg.getMid();
        if (paramView != null) {
            headers += "<link rel=\"canonical\" href=\"" + pageUrl + "\"/>";
        }
        if (msg.Hidden) {
            headers += "<meta name=\"robots\" content=\"noindex\"/>";
        }
        String cardType = StringUtils.isNotEmpty(msg.getAttachmentType()) ? "summary_large_image" : "summary";
        String msgImage = StringUtils.isNotEmpty(msg.getAttachmentType()) ? msg.getPhotoURLs().getMedium()
                : "https://i.juick.com/a/" + msg.getUser().getUid() + ".png";
        model.addAttribute("ogtype", "article");
        String cardDescription = StringEscapeUtils.escapeHtml4(PlainTextFormatter.formatTwitterCard(msg));
        headers += "<meta name=\"twitter:card\" content=\"" + cardType + "\" />\n" +
                "<meta name=\"twitter:site\" content=\"@juick\" />\n" +
                "<meta property=\"og:url\" content=\"" + pageUrl + "\" />\n" +
                "<meta property=\"og:title\" content=\"" + msg.getUser().getName() + " at Juick\" />\n" +
                "<meta property=\"og:description\" content=\"" + cardDescription + "\" />\n" +
                "<meta name=\"Description\" content=\"" + cardDescription + "\" />\n" +
                "<meta property=\"og:image\" content=\"" + msgImage + "\" />";
        String twitterName = crosspostService.getTwitterName(msg.getUser().getUid());
        if (StringUtils.isNotEmpty(twitterName)) {
            headers += "<meta name=\"twitter:creator\" content=\"@" + twitterName + "\" />\n";
        }
        if (msg.getTags().size() > 0) {
            headers += "<meta name=\"Keywords\" content=\"" + msg.getTags().stream().map(Tag::getName)
                    .collect(Collectors.joining(", ")) + "\" />\n";
        }
        model.addAttribute("headers", headers);
        model.addAttribute("contentStyle", "margin-left: 0; width: 100%");
        model.addAttribute("isModerator", visitor.getUid() == 3694);
        model.addAttribute("visitorSubscribed", messagesService.isSubscribed(visitor.getUid(), msg.getMid()));
        model.addAttribute("visitorInBL",  userService.isInBL(msg.getUser().getUid(), visitor.getUid()));
        model.addAttribute("recomm", messagesService.getMessageRecommendations(msg.getMid()));
        List<com.juick.Message> replies = messagesService.getReplies(msg.getMid());

        List<Integer> blUIDs = new ArrayList<>();
        for (int i = 0; i < replies.size(); i++) {
            com.juick.Message reply = replies.get(i);
            if (reply.getUser().getUid() != msg.getUser().getUid()
                    && !blUIDs.contains(reply.getUser().getUid())) {
                blUIDs.add(reply.getUser().getUid());
            }
            if (reply.getReplyto() > 0) {
                boolean added = false;
                for (int n = 0; n < replies.size(); n++) {
                    if (replies.get(n).getRid() == reply.getReplyto()) {
                        replies.get(n).childs.add(reply);
                        added = true;
                        break;
                    }
                }
                if (!added) {
                    reply.setReplyto(0);
                }
            }

            reply.VisitorCanComment = visitor.getUid() > 0;
            if (visitor.getUid() > 0) {
                boolean isMsgAuthor = visitor.getUid() == msg.getUser().getUid();
                boolean isReplyAuthor = visitor.getUid() == reply.getUser().getUid();
                BooleanSupplier isInBL2 = () -> userService.checkBL(visitor.getUid(), blUIDs).contains(reply.getUser().getUid());
                reply.VisitorCanComment = isMsgAuthor || (!msg.ReadOnly && (isReplyAuthor || !isInBL2.getAsBoolean()));
            }
        }

        boolean foldable = false;
        if (replies.size() > 10) {
            for (int i = 0; i < replies.size() - 1; i++) {
                if (replies.get(i).getChildsCount() > 1) {
                    foldable = true;
                    break;
                }
            }
        }
        model.addAttribute("replies", replies);
        model.addAttribute("foldable", foldable);
        return "views/thread";
    }

    // when message id is not fit to int
    @ExceptionHandler(NumberFormatException.class)
    public ResponseEntity<String> notFoundAction() {
        return new ResponseEntity<>(HttpStatus.NOT_FOUND);
    }
}