/*
 * 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.Message;
import com.juick.server.helpers.TagStats;
import com.juick.server.util.HttpNotFoundException;
import com.juick.service.MessagesService;
import com.juick.service.TagService;
import com.juick.service.UserService;
import com.juick.util.MessageUtils;
import com.juick.server.util.UserUtils;
import com.juick.www.WebApp;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

import javax.inject.Inject;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;

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

    @Inject
    WebApp webApp;
    @Inject
    MessagesService messagesService;
    @Inject
    UserService userService;
    @Inject
    TagService tagService;
    @Inject
    PageTemplates templates;

    @GetMapping("/{uname}/{mid}")
    protected void doGetThread(HttpServletRequest request, HttpServletResponse response,
                               @PathVariable String uname,
                               @PathVariable int mid) throws IOException {
        com.juick.User visitor = UserUtils.getCurrentUser();

        if (!messagesService.canViewThread(mid, visitor.getUid())) {
            response.sendError(HttpServletResponse.SC_FORBIDDEN);
            return;
        }

        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)) {
            response.sendRedirect(String.format("/%s/%d", msg.getUser().getName(), mid));
            return;
        }

        boolean listview = false;
        String paramView = request.getParameter("view");
        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;
        }

        String title = msg.getUser().getName() + ": " + msg.getTagsString();

        response.setContentType("text/html; charset=UTF-8");
        try (PrintWriter out = response.getWriter()) {
            String headers = "<link rel=\"alternate\" type=\"application/rss+xml\" title=\"@" + msg.getUser().getName() + "\" href=\"//rss.juick.com/" + msg.getUser().getName() + "/blog\"/>";
            if (paramView != null) {
                headers += "<link rel=\"canonical\" href=\"http://juick.com/" + msg.getUser().getName() + "/" + msg.getMid() + "\"/>";
            }
            if (msg.Hidden) {
                headers += "<meta name=\"robots\" content=\"noindex\"/>";
            }
            templates.pageHead(out, visitor, title, headers);
            templates.pageNavigation(out, visitor, null);

            out.println("<section id=\"content\" data-mid=\"" + msg.getMid() + "\" style=\"margin-left: 0; width: 100%\">");
            printMessage(out, msg, visitor);
            printReplies(out, msg, visitor, listview);
            out.println("</section>");

            templates.pageFooter(request, out, visitor, true);

            templates.pageEnd(out);
        }
    }

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

    public com.juick.Message printMessage(PrintWriter out, com.juick.Message msg, com.juick.User visitor) {
        msg.VisitorCanComment = visitor.getUid() > 0;

        List<TagStats> tags = tagService.getMessageTags(msg.getMid());
        String tagsStr = templates.formatTags(tags);
        if (msg.ReadOnly) {
            tagsStr += "<a>readonly</a>";
            msg.VisitorCanComment = false;
        }
        if (msg.getPrivacy() < 0) {
            tagsStr += "<a>friends</a>";
        }

        String txt;
        if (msg.getTags().stream().anyMatch(t -> t.getName().equals("code"))) {
            txt = MessageUtils.formatMessageCode(msg.getText());
        } else {
            txt = MessageUtils.formatMessage(msg.getText());
        }

        if (!tags.isEmpty()) {
            tagsStr = "<div class=\"msg-tags\">" + tagsStr + "</div>";
        }

        out.println("<ul>");
        out.println("  <li id=\"msg-" + msg.getMid() + "\" data-mid=\"" + msg.getMid() + "\" class=\"msg msgthread\">");
        out.println("    <div class=\"msg-cont\">");
        out.println("      <div class=\"msg-menu\"><a href=\"#\"></a></div>");
        out.println("      <div class=\"msg-ts\">" + templates.formatJSLocalTime(msg.getDate()) + "</div>");
        out.println("      <div class=\"msg-avatar\"><a href=\"/" + msg.getUser().getName() + "/\"><img src=\"//i.juick.com/a/" + msg.getUser().getUid() + ".png\" alt=\"" + msg.getUser().getName() + "\"/></a></div>");
        out.println("      <div class=\"msg-header\">@<a href=\"/" + msg.getUser().getName() + "/\">" + msg.getUser().getName() + "</a>:" + tagsStr + "</div>");
        out.println("      <div class=\"msg-txt\">" + txt + "</div>");

        if (msg.getAttachmentType() != null) {
            out.println("    <div class=\"msg-media\"><a href=\"//i.juick.com/p/" + msg.getMid() + "." + msg.getAttachmentType() + "\"><img src=\"//i.juick.com/photos-512/" + msg.getMid() + "." + msg.getAttachmentType() + "\" alt=\"\"/></a></div>");
        }

        boolean visitorInBL = false;
        if (visitor.getUid() > 0) {
            if (visitor.getUid() == msg.getUser().getUid()) {
                msg.VisitorCanComment = true;
            } else {
                visitorInBL = userService.isInBL(msg.getUser().getUid(), visitor.getUid());
                if (visitorInBL) {
                    msg.VisitorCanComment = false;
                }
            }
        }

        if (msg.VisitorCanComment) {
            out.println("    <form action=\"/comment\" method=\"POST\" enctype=\"multipart/form-data\"><input type=\"hidden\" name=\"mid\" value=\"" + msg.getMid() + "\"/>");
            out.println("      <div class=\"msg-comment\"><div class=\"ta-wrapper\"><textarea name=\"body\" rows=\"1\" class=\"reply\" placeholder=\"Написать комментарий\"></textarea></div></div>");
            out.println("    </form>");
        }

        List<String> recomm = messagesService.getMessageRecommendations(msg.getMid());
        if (!recomm.isEmpty()) {
            out.print("    <div class=\"msg-recomms\">Рекомендовали (" + recomm.size() + "): ");
            for (int i = 0; i < recomm.size(); i++) {
                if (i > 0) {
                    out.print(", ");
                }
                out.print("<a href=\"/" + recomm.get(i) + "/\">@" + recomm.get(i) + "</a>");
            }
            out.println("</div>");
        }
        out.println("    </div>");
        out.println("  </li>");

        out.println("  <li class=\"toolbar\"><ul>");
        out.println("    <li><a href=\"/" + msg.getMid() + "\"><div style=\"background-position: -64px 0\"></div>" + msg.getMid() + "</a></li>");
        if (visitor.getUid() > 0) {
            if (visitor.getUid() != msg.getUser().getUid()) {
                if (messagesService.isSubscribed(visitor.getUid(), msg.getMid())) {
                    out.println("    <li><a href=\"/post?body=U+%23" + msg.getMid() + "\"><div style=\"background-position: -48px 0\"></div>Подписан</a></li>");
                } else {
                    out.println("    <li><a href=\"/post?body=S+%23" + msg.getMid() + "\"><div style=\"background-position: -16px 0\"></div>Подписаться</a></li>");
                }
                if (!visitorInBL) {
                    out.println("    <li><a href=\"/post?body=%21+%23" + msg.getMid() + "\"><div style=\"background-position: -32px 0\"></div>Рекомендовать</a></li>");
                }
            } else {
                out.println("    <li><a href=\"/post?body=D+%23" + msg.getMid() + "\"><div style=\"background-position: 0\"></div>Удалить</a></li>");
            }
        }
        out.println("  </ul></li>");
        out.println("</ul>");

        return msg;
    }

    public void printReplies(PrintWriter out, com.juick.Message msg, com.juick.User visitor, boolean listview) {
        List<com.juick.Message> replies = messagesService.getReplies(msg.getMid());

        List<Integer> blUIDs = new ArrayList<Integer>();
        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);
                }
            }
        }

        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;
                }
            }
        }

        out.println("<div class=\"title2\">");
        out.print("  <div class=\"title2-right\">");
        if (listview) {
            out.print("<a href=\"?view=tree\" rel=\"nofollow\">Показать деревом</a>");
        } else {
            if (foldable) {
                out.print("<span id=\"unfoldall\"><a href=\"#\">Раскрыть все</a> &#183; </span>");
            }
            out.print("<a href=\"?view=list\" rel=\"nofollow\">Показать списком</a>");
        }
        out.print("</div>");
        out.println("  <h2>Ответы (" + replies.size() + ")</h2>");
        out.println("</div>");

        out.println("<ul id=\"replies\">");

        if (!replies.isEmpty()) {
            if (visitor.getUid() > 0 && msg.getUser().getUid() == visitor.getUid()) {
                for (Message reply : replies) {
                    reply.VisitorCanComment = true;
                }
            } else if (visitor.getUid() > 0 && msg.VisitorCanComment) {
                blUIDs = userService.checkBL(visitor.getUid(), blUIDs);
                for (Message reply : replies) {
                    reply.VisitorCanComment = reply.getUser().getUid() == visitor.getUid() || !blUIDs.contains(reply.getUser().getUid());
                }
            } else {
                for (Message reply : replies) {
                    reply.VisitorCanComment = false;
                }
            }

            if (listview) {
                printList(out, replies, visitor);
            } else {
                printTree(out, replies, visitor, 0, 0, false);
            }

            for (Message reply : replies) {
                reply.cleanupChilds();
            }
            replies.clear();
        }

        out.println("</ul>");
    }

    public void printTree(PrintWriter out, List<com.juick.Message> replies, com.juick.User visitor, int ReplyTo, int margin, boolean hidden) {
        if (margin > 240) {
            margin = 240;
        }

        for (int i = 0; i < replies.size(); i++) {
            com.juick.Message msg = replies.get(i);
            if (msg.getReplyto() == ReplyTo) {

                out.print("  <li id=\"" + msg.getRid() + "\" class=\"msg\" style=\"");
                if (margin > 0) {
                    out.print("margin-left: " + margin + "px;");
                }
                if (hidden) {
                    out.print("display:none;");
                }
                out.println("\">");
                out.println("    <div class=\"msg-cont\">");
                out.println("      <div class=\"msg-header\">");
				if (!msg.getUser().isBanned()) {
					out.println("        @<a href=\"/" + msg.getUser().getName() + "/\">" + msg.getUser().getName() + "</a>:");
					out.println("        <div class=\"msg-avatar\"><a href=\"/" + msg.getUser().getName() + "/\"><img src=\"//i.juick.com/a/" + msg.getUser().getUid() + ".png\" alt=\"" + msg.getUser().getName() + "\"/></a></div>");
                } else {
					out.println("        [удалено]:");
					out.println("        <div class=\"msg-avatar\"><img src=\"//i.juick.com/av-96.png\"/></div>");
                }
                out.println("        <div class=\"msg-menu\"><a href=\"#\" class=\"a-thread-links\"></a></div>");
                out.println("        <div class=\"msg-ts\"><a href=\"/" + msg.getMid() + "#" + msg.getRid() + "\" title=\"" + templates.sdfSQL.format(msg.getDate()) + " GMT\">" + templates.formatDate(msg.TimeAgo, msg.getDate()) + "</a></div>");
                out.println("      </div>");
                out.println("      <div class=\"msg-txt\">" + MessageUtils.formatMessage(msg.getText()) + "</div>");
                if (msg.getAttachmentType() != null) {
                    out.println("    <div class=\"msg-media\"><a href=\"//i.juick.com/p/" + msg.getMid() + "-" + msg.getRid() + "." + msg.getAttachmentType() + "\"><img src=\"//i.juick.com/photos-512/" + msg.getMid() + "-" + msg.getRid() + "." + msg.getAttachmentType() + "\" alt=\"\"/></a></div>");
                }
                out.print("    <div class=\"msg-links\">/" + msg.getRid());
                if (msg.getReplyto() > 0) {
                    out.print(" в ответ на <a href=\"#" + msg.getReplyto() + "\">/" + msg.getReplyto() + "</a>");
                }
                if (msg.VisitorCanComment) {
                    out.println(" &#183; <a href=\"/post?body=%23" + msg.getMid() + "/" + msg.getRid() + "%20\" class=\"a-thread-comment\">Ответить</a></div>");
                    out.println("    <div class=\"msg-comment\" style=\"display: none\"></div>");
                } else if (visitor.getUid() == 0) {
                    out.println(" &#183; <a href=\"#\" class=\"a-login\">Ответить</a></div>");
                }

                int childs = msg.getChildsCount();
                if (ReplyTo == 0 && childs > 1 && replies.size() > 10) {
                    out.println("    <div class=\"msg-comments\"><a href=\"#\">" + templates.formatReplies(childs) + "</a></div>");
                }
                out.println("    </div>");
                out.println("  </li>");

                if (ReplyTo == 0 && childs > 1 && replies.size() > 10) {
                    printTree(out, msg.childs, visitor, msg.getRid(), margin + 20, true);
                } else if (childs > 0) {
                    printTree(out, msg.childs, visitor, msg.getRid(), margin + 20, hidden);
                }
            }
        }
    }

    public void printList(PrintWriter out, List<com.juick.Message> replies, com.juick.User visitor) {
        for (Message msg : replies) {
            out.print("  <li id=\"" + msg.getRid() + "\" class=\"msg\">");
            out.println("    <div class=\"msg-cont\">");
            out.println("      <div class=\"msg-header\">");
            if (!msg.getUser().isBanned()) {
            	out.println("      @<a href=\"/" + msg.getUser().getName() + "/\">" + msg.getUser().getName() + "</a>:");
            	out.println("      <div class=\"msg-avatar\"><a href=\"/" + msg.getUser().getName() + "/\"><img src=\"//i.juick.com/a/" + msg.getUser().getUid() + ".png\" alt=\"" + msg.getUser().getName() + "\"/></a></div>");
            } else {
            	out.println("      [удалено]:");
            	out.println("      <div class=\"msg-avatar\"><img src=\"//i.juick.com/av-96.png\"/></div>");
            }
            out.println("        <div class=\"msg-menu\"><a href=\"#\" class=\"a-thread-links\"></a></div>");
            out.println("        <div class=\"msg-ts\"><a href=\"/" + msg.getMid() + "#" + msg.getRid() + "\" title=\"" + PageTemplates.sdfSQL.format(msg.getDate()) + " GMT\">" + templates.formatDate(msg.TimeAgo, msg.getDate()) + "</a></div>");
            out.println("      </div>");
            out.println("      <div class=\"msg-txt\">" + MessageUtils.formatMessage(msg.getText()) + "</div>");
            if (msg.getAttachmentType() != null) {
                out.println("    <div class=\"msg-media\"><a href=\"//i.juick.com/p/" + msg.getMid() + "-" + msg.getRid() + "." + msg.getAttachmentType() + "\"><img src=\"//i.juick.com/photos-512/" + msg.getMid() + "-" + msg.getRid() + "." + msg.getAttachmentType() + "\" alt=\"\"/></a></div>");
            }
            out.print("    <div class=\"msg-links\">/" + msg.getRid());
            if (msg.getReplyto() > 0) {
                out.print(" в ответ на <a href=\"#" + msg.getReplyto() + "\">/" + msg.getReplyto() + "</a>");
            }
            if (msg.VisitorCanComment) {
                out.println(" &#183; <a href=\"#\" class=\"a-thread-comment\">Ответить</a></div>");
                out.println("    <div class=\"msg-comment\" style=\"display: none\"></div>");
            } else if (visitor.getUid() == 0) {
                out.println("    <div class=\"msg-links\"><a href=\"/post?body=%23" + msg.getMid() + "/" + msg.getRid() + "%20\" class=\"a-thread-comment\">Ответить</a></div>");
            }
            out.println("    </div>");
            out.println("  </li>");
        }
    }
}