/*
 * 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.juick.User;
import com.mitchellbosecke.pebble.PebbleEngine;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.jdbc.core.JdbcTemplate;

import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part;
import java.io.*;
import java.net.URL;
import java.net.URLConnection;
import java.nio.file.Paths;
import java.util.UUID;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

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

    private static final Logger logger = LoggerFactory.getLogger(Utils.class);

    private static final PebbleEngine engine = new PebbleEngine.Builder().build();
    private static String tmpDir = "/var/www/juick.com/i/tmp/";

    public static String getCookie(HttpServletRequest request, String name) {
        Cookie cookies[] = request.getCookies();
        if (cookies != null) {
            for (int i = 0; i < cookies.length; i++) {
                if (cookies[i].getName().equals(name)) {
                    return cookies[i].getValue();
                }
            }
        }
        return null;
    }

    public static String receiveMultiPartFile(HttpServletRequest request, String name) throws IOException, ServletException {
        String attachmentFName = null;

        Part filePart = request.getPart(name);
        if (filePart != null) {
            String partname = Utils.getPartFilename(filePart);
            if (partname != null && partname.length() > 0) {
                String attachmentType = partname.substring(partname.length() - 3).toLowerCase();
                if (attachmentType.equals("jpg") || attachmentType.equals("peg") || attachmentType.equals("png")) {
                    if (attachmentType.equals("peg")) {
                        attachmentType = "jpg";
                    }
                    attachmentFName = UUID.randomUUID().toString() + "." + attachmentType;
                    filePart.write(Paths.get(getTmpDir(), attachmentFName).toString());
                } else {
                    throw new IOException("Wrong file type");
                }
            }
        }

        return attachmentFName;
    }

    public static com.juick.User getVisitorUser(JdbcTemplate sql, HttpServletRequest request, HttpServletResponse response) {
        String hash = getCookie(request, "hash");
        if (hash != null) {
            com.juick.User visitor = com.juick.server.UserQueries.getUserByHash(sql, hash);
            if (response != null && visitor.getUid() > 0) {
                response.setHeader("X-Username", visitor.getName());
            }
            return visitor;
        } else {
            return new User();
        }
    }

    public static void sendTemporaryRedirect(HttpServletResponse response, String location) {
        response.setStatus(HttpServletResponse.SC_MOVED_TEMPORARILY);
        response.setHeader("Location", location);
    }

    public static void sendPermanentRedirect(HttpServletResponse response, String location) {
        response.setStatus(HttpServletResponse.SC_MOVED_PERMANENTLY);
        response.setHeader("Location", location);
    }

    public static String getPartFilename(Part part) {
        for (String cd : part.getHeader("content-disposition").split(";")) {
            if (cd.trim().startsWith("filename")) {
                String filename = cd.substring(cd.indexOf('=') + 1).trim().replace("\"", "");
                return filename.substring(filename.lastIndexOf('/') + 1).substring(filename.lastIndexOf('\\') + 1); // MSIE fix.
            }
        }
        return null;
    }

    public static void replyJSON(HttpServletRequest request, HttpServletResponse response, String json) throws IOException {
        response.setContentType("application/json; charset=UTF-8");
        response.setHeader("Access-Control-Allow-Origin", "*");

        String callback = request.getParameter("callback");
        if (callback != null && (callback.length() > 64 || !callback.matches("[a-zA-Z0-9\\-\\_]+"))) {
            callback = null;
        }

        PrintWriter out = response.getWriter();
        try {
            if (callback != null) {
                out.print(callback + "(");
                out.print(json);
                out.print(")");
            } else {
                out.print(json);
            }
        } finally {
            out.close();
        }
    }

    public static String encodeSphinx(String str) {
        return str.replaceAll("@", "\\\\@");
    }

    public static String fetchURL(String url) {
        try {
            URLConnection c = new URL(url).openConnection();
            BufferedReader in = new BufferedReader(new InputStreamReader(c.getInputStream()));
            String inputLine;
            StringBuilder b = new StringBuilder();
            while ((inputLine = in.readLine()) != null) {
                b.append(inputLine).append("\n");
            }
            in.close();
            return b.toString();
        } catch (Exception e) {
            logger.error("fetchURL" , e);
            return null;
        }
    }

    public static String downloadImage(URL url) throws Exception {
        String attachmentFName = null;
        Exception ex = null;

        InputStream is = null;
        FileOutputStream fos = null;
        try {
            URLConnection urlConn = url.openConnection();
            is = urlConn.getInputStream();
            String mime = urlConn.getContentType();

            String attachmentType;
            if (mime != null && mime.equals("image/jpeg")) {
                attachmentType = "jpg";
            } else if (mime != null && mime.equals("image/png")) {
                attachmentType = "png";
            } else {
                throw new Exception("Wrong file type");
            }

            attachmentFName = UUID.randomUUID().toString() + "." + attachmentType;
            fos = new FileOutputStream("/var/www/juick.com/i/tmp/" + attachmentFName);
            byte[] buffer = new byte[10240];
            int len;
            while ((len = is.read(buffer)) > 0) {
                fos.write(buffer, 0, len);
            }
        } catch (Exception e) {
            ex = e;
            attachmentFName = null;
        } finally {
            try {
                if (is != null) {
                    is.close();
                }
            } finally {
                if (fos != null) {
                    fos.close();
                }
            }
        }

        if (ex != null) {
            throw ex;
        } else {
            return attachmentFName;
        }
    }

    private static Pattern regexLinks2 = Pattern.compile("((?<=\\s)|(?<=\\A))([\\[\\{]|&lt;)((?:ht|f)tps?://(?:www\\.)?([^\\/\\s\\\"\\)\\!]+)/?(?:[^\\]\\}](?<!&gt;))*)([\\]\\}]|&gt;)");

    public static String formatMessageCode(String msg) {
        msg = msg.replaceAll("&", "&amp;");
        msg = msg.replaceAll("<", "&lt;");
        msg = msg.replaceAll(">", "&gt;");

        // http://juick.com/last?page=2
        // <a href="http://juick.com/last?page=2" rel="nofollow">http://juick.com/last?page=2</a>
        msg = msg.replaceAll("((?<=\\s)|(?<=\\A))((?:ht|f)tps?://(?:www\\.)?([^\\/\\s\\n\\\"]+)/?[^\\s\\n\\\"]*)", "$1<a href=\"$2\" rel=\"nofollow\">$2</a>");

        // (http://juick.com/last?page=2)
        // (<a href="http://juick.com/last?page=2" rel="nofollow">http://juick.com/last?page=2</a>)
        Matcher m = regexLinks2.matcher(msg);
        StringBuffer sb = new StringBuffer();
        while (m.find()) {
            String url = m.group(3).replace(" ", "%20").replaceAll("\\s+", "");
            m.appendReplacement(sb, "$1$2<a href=\"" + url + "\" rel=\"nofollow\">" + url + "</a>$5");
        }
        m.appendTail(sb);
        msg = sb.toString();

        return "<pre>" + msg + "</pre>";
    }
    public static String formatMessage(String msg) {
        msg = msg.replaceAll("&", "&amp;");
        msg = msg.replaceAll("<", "&lt;");
        msg = msg.replaceAll(">", "&gt;");

        // --
        // &mdash;
        msg = msg.replaceAll("((?<=\\s)|(?<=\\A))\\-\\-?((?=\\s)|(?=\\Z))", "$1&mdash;$2");

        // http://juick.com/last?page=2
        // <a href="http://juick.com/last?page=2" rel="nofollow">juick.com</a>
        msg = msg.replaceAll("((?<=\\s)|(?<=\\A))((?:ht|f)tps?://(?:www\\.)?([^\\/\\s\\n\\\"]+)/?[^\\s\\n\\\"]*)", "$1<a href=\"$2\" rel=\"nofollow\">$3</a>");

        // [link text][http://juick.com/last?page=2]
        // <a href="http://juick.com/last?page=2" rel="nofollow">link text</a>
        msg = msg.replaceAll("\\[([^\\]]+)\\]\\[((?:ht|f)tps?://[^\\]]+)\\]", "<a href=\"$2\" rel=\"nofollow\">$1</a>");
        msg = msg.replaceAll("\\[([^\\]]+)\\]\\(((?:ht|f)tps?://[^\\)]+)\\)", "<a href=\"$2\" rel=\"nofollow\">$1</a>");

        // #12345
        // <a href="http://juick.com/12345">#12345</a>
        msg = msg.replaceAll("((?<=\\s)|(?<=\\A)|(?<=\\p{Punct}))#(\\d+)((?=\\s)|(?=\\Z)|(?=\\))|(?=\\.)|(?=\\,))", "$1<a href=\"http://juick.com/$2\">#$2</a>$3");

        // #12345/65
        // <a href="http://juick.com/12345#65">#12345/65</a>
        msg = msg.replaceAll("((?<=\\s)|(?<=\\A)|(?<=\\p{Punct}))#(\\d+)/(\\d+)((?=\\s)|(?=\\Z)|(?=\\p{Punct}))", "$1<a href=\"http://juick.com/$2#$3\">#$2/$3</a>$4");

        // *bold*
        // <b>bold</b>
        msg = msg.replaceAll("((?<=\\s)|(?<=\\A)|(?<=\\p{Punct}))\\*([^\\*\\n<>]+)\\*((?=\\s)|(?=\\Z)|(?=\\p{Punct}))", "$1<b>$2</b>$3");

        // /italic/
        // <i>italic</i>
        msg = msg.replaceAll("((?<=\\s)|(?<=\\A))/([^\\/\\n<>]+)/((?=\\s)|(?=\\Z)|(?=\\p{Punct}))", "$1<i>$2</i>$3");

        // _underline_
        // <span class="u">underline</span>
        msg = msg.replaceAll("((?<=\\s)|(?<=\\A))_([^\\_\\n<>]+)_((?=\\s)|(?=\\Z)|(?=\\p{Punct}))", "$1<span class=\"u\">$2</span>$3");

        // /12
        // <a href="#12">/12</a>
        msg = msg.replaceAll("((?<=\\s)|(?<=\\A))\\/(\\d+)((?=\\s)|(?=\\Z)|(?=\\p{Punct}))", "$1<a href=\"#$2\">/$2</a>$3");

        // @username@jabber.org
        // <a href="http://juick.com/username@jabber.org/">@username@jabber.org</a>
        msg = msg.replaceAll("((?<=\\s)|(?<=\\A))@([\\w\\-\\.]+@[\\w\\-\\.]+)((?=\\s)|(?=\\Z)|(?=\\p{Punct}))", "$1<a href=\"http://juick.com/$2/\">@$2</a>$3");

        // @username
        // <a href="http://juick.com/username/">@username</a>
        msg = msg.replaceAll("((?<=\\s)|(?<=\\A))@([\\w\\-]{2,16})((?=\\s)|(?=\\Z)|(?=\\p{Punct}))", "$1<a href=\"http://juick.com/$2/\">@$2</a>$3");

        // (http://juick.com/last?page=2)
        // (<a href="http://juick.com/last?page=2" rel="nofollow">juick.com</a>)
        Matcher m = regexLinks2.matcher(msg);
        StringBuffer sb = new StringBuffer();
        while (m.find()) {
            String url = m.group(3).replace(" ", "%20").replaceAll("\\s+", "");
            m.appendReplacement(sb, "$1$2<a href=\"" + url + "\" rel=\"nofollow\">$4</a>$5");
        }
        m.appendTail(sb);
        msg = sb.toString();

        // > citate
        msg = msg.replaceAll("(?:(?<=\\n)|(?<=\\A))&gt; *(.*)?(\\n|(?=\\Z))", "<q>$1</q>");
        msg = msg.replaceAll("</q><q>", "\n");

        msg = msg.replaceAll("\n", "<br/>\n");
        return msg;
    }
    public static PebbleEngine getEngine() {
        return engine;
    }

    public static String getTmpDir() {
        return tmpDir;
    }

    public static void setTmpDir(String tmpDir) {
        Utils.tmpDir = tmpDir;
    }
}