/**
 * This file is part of the Meeds project (https://meeds.io/).
 *
 * Copyright (C) 2020 - 2025 Meeds Association contact@meeds.io
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
package org.exoplatform.services.resources;

import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;


/**
 * Created by The eXo Platform SAS . Author : Tuan Nguyen tuan08@users.sourceforge.net Date: May 14, 2004 Time: 1:12:22 PM
 */
@SuppressWarnings("serial")
public class ResourceBundleData extends ResourceBundleDescription implements Serializable {

    /** . */
    private static Pattern LINE_SEPARATOR = Pattern.compile("[\\r]?\\n");

    /** . */
    private static Pattern UNICODE_CHARACTER = Pattern.compile("\\\\u[\\p{XDigit}]{4}+");

    /** . */
    private String data;

    /** . */
    Object[][] contents;

    public ResourceBundleData(String data) {
        setData(data);
        setResourceType("-");
        setLanguage(DEFAULT_LANGUAGE);
    }

    public ResourceBundleData() {
        this(null);
    }

    public String getData() {
        return data;
    }

    public void setData(String data) {
        this.data = data;

        if (data != null) {
            String[] tokens = LINE_SEPARATOR.split(data);
            List<String[]> properties = new ArrayList<String[]>();
            for (String token : tokens) {
                int idx = token.indexOf('=');
                if (idx < 0 || idx >= token.length() - 1) {
                    continue;
                }
                String key = token.substring(0, idx);
                if (key.trim().startsWith("#")) {
                    continue;
                }
                String value = convert(token.substring(idx + 1, token.length()));
                properties.add(new String[] { key, value });
            }
            String[][] aProperties = new String[properties.size()][2];
            contents = properties.toArray(aProperties);
        } else {
            contents = new Object[0][];
        }

    }

    static String convert(String content) {
        Matcher matcher = UNICODE_CHARACTER.matcher(content);
        StringBuilder buffer = new StringBuilder(content.length());
        int start = 0;
        while (matcher.find(start)) {
            buffer.append(content.substring(start, matcher.start()));
            buffer.append(unicode2Char(matcher.group()));
            start = matcher.end();
        }
        if (start >= 0 && start < content.length()) {
            buffer.append(content.substring(start));
        }
        return buffer.toString();
    }

    static char unicode2Char(String unicodeChar) {
        int value = 0;
        char aChar;
        for (int i = 0; i < 4; i++) {
            aChar = unicodeChar.charAt(i + 2);
            switch (aChar) {
                case '0':
                case '1':
                case '2':
                case '3':
                case '4':
                case '5':
                case '6':
                case '7':
                case '8':
                case '9': {
                    value = (value << 4) + aChar - '0';
                    break;
                }
                case 'a':
                case 'b':
                case 'c':
                case 'd':
                case 'e':
                case 'f': {
                    value = (value << 4) + 10 + aChar - 'a';
                    break;
                }
                case 'A':
                case 'B':
                case 'C':
                case 'D':
                case 'E':
                case 'F': {
                    value = (value << 4) + 10 + aChar - 'A';
                    break;
                }
                default: {
                    throw new IllegalArgumentException("Malformed \\uxxxx encoding.");
                }
            }
        }
        return (char) value;
    }
}
