/*
 * Juick
 * Copyright (C) 2008-2011, Ugnich Anton
 *
 * 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;

import com.mitchellbosecke.pebble.error.PebbleException;
import com.mitchellbosecke.pebble.template.PebbleTemplate;
import org.springframework.jdbc.core.JdbcTemplate;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URISyntaxException;
import java.net.URL;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.HashMap;
import java.util.Map;

/**
 *
 * @author Ugnich Anton
 */
public class Help {

    protected void doRedirectToHelpIndex(HttpServletResponse response) throws ServletException, IOException {
        Utils.sendTemporaryRedirect(response, "/help/ru/");
    }

    protected void doGetHelp(JdbcTemplate sql, HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException, PebbleException, URISyntaxException {
        com.juick.User visitor = Utils.getVisitorUser(sql, request, response);

        String path[] = request.getRequestURI().split("/");
        String page;
        if (path.length < 3 || path.length > 4 || path[2].length() != 2 || !path[2].matches("^[a-z]+$")) {
            Errors.doGet404(sql, request, response);
            return;
        }

        if (path.length == 4) {
            page = path[3];
            if (!page.matches("^[a-zA-Z0-9\\-]*$") || page.equals("navigation") || page.equals("index")) {
                Errors.doGet404(sql, request, response);
                return;
            }
        } else {
            page = "index";
        }

        URL f = getClass().getResource("/help/" + path[2] + "/" + page);
        if (f == null) {
            Errors.doGet404(sql, request, response);
            return;
        }

        response.setContentType("text/html; charset=UTF-8");
        try (PrintWriter out = response.getWriter()) {
            PebbleTemplate template = Utils.getEngine().getTemplate("views/help.html");
            Map<String, Object> context = new HashMap<>();
            context.put("title", "Помощь");
            context.put("visitor", visitor);
            context.put("content", new String(Files.readAllBytes(Paths.get(f.toURI()))));
            context.put("navigation", new String(Files.readAllBytes(
                    new File(getClass().getResource("/help/" + path[2] + "/navigation").toURI()).toPath())));
            template.evaluate(out, context);
        }
    }
}