/*
 * 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.service.MessagesService;
import com.juick.service.TagService;
import com.juick.server.util.UserUtils;
import com.juick.www.Utils;
import com.juick.www.WebApp;
import org.apache.commons.codec.CharEncoding;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.text.StringEscapeUtils;
import org.springframework.stereotype.Controller;
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 javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URLEncoder;
import java.util.List;

/**
 *
 * @author Ugnich Anton
 */
@Controller
public class Tags {
    @Inject
    WebApp webApp;
    @Inject
    MessagesService messagesService;
    @Inject
    TagService tagService;
    @Inject
    PageTemplates templates;

    @GetMapping("/tag/{tagName}")
    protected void doGet(HttpServletRequest request,
                         @PathVariable String tagName,
                         @RequestParam(required = false, defaultValue = "0") int before,
                         HttpServletResponse response) throws IOException {
        com.juick.User visitor = UserUtils.getCurrentUser();

        String paramTagStr = StringEscapeUtils.unescapeHtml4(tagName);
        com.juick.Tag paramTag = tagService.getTag(paramTagStr, false);
        if (paramTag == null) {
            response.sendError(HttpServletResponse.SC_NOT_FOUND);
            return;
        } else if (paramTag.SynonymID > 0 && paramTag.TID != paramTag.SynonymID) {
            com.juick.Tag synTag = tagService.getTag(paramTag.SynonymID);
            String url = "/tag/" + URLEncoder.encode(StringEscapeUtils.escapeHtml4(synTag.getName()), CharEncoding.UTF_8);
            if (request.getQueryString() != null) {
                url += "?" + request.getQueryString();
            }
            Utils.sendPermanentRedirect(response, url);
            return;
        } else if (!paramTag.getName().equals(paramTagStr)) {
            String url = "/tag/" + URLEncoder.encode(StringEscapeUtils.escapeHtml4(paramTag.getName()), CharEncoding.UTF_8);
            if (request.getQueryString() != null) {
                url += "?" + request.getQueryString();
            }
            Utils.sendPermanentRedirect(response, url);
            return;
        }

        int visitor_uid = visitor.getUid();

        String title = "*" + StringEscapeUtils.escapeHtml4(paramTag.getName());
        List<Integer> mids = messagesService.getTag(paramTag.TID, visitor_uid, before, (visitor_uid == 0) ? 40 : 20);

        response.setContentType("text/html; charset=UTF-8");
        try (PrintWriter out = response.getWriter()) {
            String head = StringUtils.EMPTY;
            if (tagService.getTagNoIndex(paramTag.TID)) {
                head = "<meta name=\"robots\" content=\"noindex,nofollow\"/>";
            } else if (before > 0 || mids.size() < 5) {
                head = "<meta name=\"robots\" content=\"noindex\"/>";
            }
            templates.pageHead(out, visitor, title, head);
            templates.pageNavigation(out, visitor, null);

            out.println("<section id=\"content\">");

            if (mids.size() > 0) {
                templates.printMessages(out, null, mids, visitor);
            }

            if (mids.size() >= 20) {
                String nextpage = "/tag/" + URLEncoder.encode(paramTag.getName(), CharEncoding.UTF_8) + "?before=" + mids.get(mids.size() - 1);
                out.println("<p class=\"page\"><a href=\"" + nextpage + "\" rel=\"prev\">Читать дальше →</a></p>");
            }

            out.println("</section>");
			
			templates.pageHomeColumn(out, visitor);

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

            templates.pageEnd(out);
        }
    }
}