/*
 * 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.server.util.HttpNotFoundException;
import com.juick.server.util.UserUtils;
import com.juick.service.MessagesService;
import com.juick.www.HelpService;
import org.commonmark.parser.Parser;
import org.commonmark.renderer.html.HtmlRenderer;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;

import javax.inject.Inject;
import java.io.IOException;
import java.net.URISyntaxException;
import java.util.Locale;
import java.util.Objects;

/**
 * Created by aalexeev on 11/21/16.
 */
@Controller
public class Help {
    @Inject
    private HelpService helpService;
    @Inject
    private MessagesService messagesService;
    @Inject
    private Parser cmParser;
    @Inject
    private HtmlRenderer helpRenderer;

    @GetMapping({"/help/", "/help", "/help/{langOrPage}", "/help/{lang}/{page}"})
    public String showHelp(
            Locale locale,
            @PathVariable(required = false, name = "lang") String lang,
            @PathVariable(required = false, name = "page") String page,
            @PathVariable(required = false, name = "langOrPage") String langOrPage,
            Model model) throws IOException, URISyntaxException {
        com.juick.User visitor = UserUtils.getCurrentUser();

        String navigation = null;

        if (langOrPage != null) {
            if (helpService.canBeLang(langOrPage)) {
                navigation = helpService.getHelp("navigation", langOrPage);
                if (navigation != null)
                    lang = langOrPage;
            }

            if (navigation == null && helpService.canBePage(langOrPage))
                page = langOrPage;
        }

        if (lang == null) {
            lang = locale.getLanguage();
        }

        String content = helpService.getHelp(page, lang);
        if (content == null && !Objects.equals("index", page))
            content = helpService.getHelp("index", lang);

        if (navigation == null)
            navigation = helpService.getHelp("navigation", lang);

        if (content == null || navigation == null)
            throw new HttpNotFoundException();

        model.addAttribute("navigation", helpRenderer.render(cmParser.parse(navigation)));
        model.addAttribute("content", helpRenderer.render(cmParser.parse(content)));
        model.addAttribute("visitor", visitor);

        return "views/help";
    }
}