package com.juick.util;

import org.apache.commons.lang3.StringUtils;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * Created by aalexeev on 11/13/16.
 */
public class MessageUtils {
    private MessageUtils() {
        throw new IllegalStateException();
    }

    public static String formatQuote(final String quote) {
        String result = quote;

        if (quote != null) {
            if (quote.length() > 50) {
                result = ">" + quote.substring(0, 47).replace('\n', ' ') + "...\n";
            } else if (!quote.isEmpty()) {
                result = ">" + quote.replace('\n', ' ') + "\n";
            }
        }

        return result;
    }

    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+", StringUtils.EMPTY);
            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+", StringUtils.EMPTY);
            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;
    }
}