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/*
 * See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 * This 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 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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 software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */
package org.xwiki.rendering.wikimodel.xwiki.xwiki20;

import org.xwiki.rendering.wikimodel.WikiParameters;
import org.xwiki.rendering.wikimodel.WikiReferenceParser;

/**
 * @version $Id: 4e16c533c61978c07df1ae9af11a7f0286cb7267 $
 * @since 4.0M1
 */
public class XWikiReferenceParser extends WikiReferenceParser
{
    @Override
    protected String getLabel(String[] chunks)
    {
        return chunks[0];
    }

    @Override
    protected String getLink(String[] chunks)
    {
        return chunks[1];
    }

    @Override
    protected WikiParameters getParameters(String[] chunks)
    {
        return XWikiWikiParameters.newWikiParameters(chunks[2]);
    }

    @Override
    protected String[] splitToChunks(String str)
    {
        String[] chunks = new String[3];

        char[] array = str.toCharArray();

        StringBuffer label = new StringBuffer();
        StringBuffer reference = new StringBuffer();
        StringBuffer parameters = new StringBuffer();

        boolean foundReference = false;
        int i = 0;
        int nb;
        for (boolean escaped = false; i < array.length; ++i) {
            char c = array[i];

            if (!escaped) {
                if (array[i] == '~') {
                    escaped = true;
                } else if ((nb = countFirstChar(array, i, '>')) >= 2) {
                    for (; nb > 2; --nb) {
                        label.append(array[i++]);
                    }
                    foundReference = true;
                    i += 2;
                    parseReference(array, i, reference, parameters);
                    break;
                } else if ((nb = countFirstChar(array, i, '|')) >= 2) {
                    for (; nb > 2; --nb) {
                        label.append(array[i++]);
                    }
                    i += 2;
                    parameters.append(array, i, array.length - i);
                    break;
                } else if (c == '[' && i + 1 < array.length
                    && array[i + 1] == '[')
                {
                    int endLink = findEndLink(array, i + 2);
                    if (endLink != -1) {
                        // If we find an internal link we skip it
                        label.append(array, i, endLink - i);
                        i = endLink - 1;
                    } else {
                        label.append("[[");
                        ++i;
                    }
                } else {
                    label.append(c);
                }
            } else {
                label.append(c);
                escaped = false;
            }
        }

        if (!foundReference) {
            chunks[1] = label.toString();
        } else {
            chunks[0] = label.toString();
            chunks[1] = reference.toString();
        }

        if (parameters.length() > 0) {
            chunks[2] = parameters.toString();
        }

        return chunks;
    }

    private int findEndLink(char[] array, int i)
    {
        int linkdepth = 1;
        int endLink = -1;

        for (boolean escaped = false; i < array.length; ++i) {
            char c = array[i];

            if (!escaped) {
                if (array[i] == '~') {
                    escaped = true;
                } else if (c == '[' && i + 1 < array.length
                    && array[i + 1] == '[')
                {
                    ++linkdepth;
                    ++i;
                } else if (c == ']' && i + 1 < array.length
                    && array[i + 1] == ']')
                {
                    --linkdepth;
                    ++i;
                    endLink = i + 1;
                    if (linkdepth == 0) {
                        break;
                    }
                }
            } else {
                escaped = false;
            }
        }

        return endLink;
    }

    /**
     * Extract the link and the parameters.
     *
     * @param array the array to extract information from
     * @param i the current position in the array
     * @param reference the link buffer to fill
     * @param parameters the parameters buffer to fill
     */
    private void parseReference(char[] array, int i, StringBuffer reference,
        StringBuffer parameters)
    {
        int nb;

        for (boolean escaped = false; i < array.length; ++i) {
            char c = array[i];

            if (!escaped) {
                if (array[i] == '~' && !escaped) {
                    escaped = true;
                } else if ((nb = countFirstChar(array, i, '|')) >= 2) {
                    for (; nb > 2; --nb) {
                        reference.append(array[i++]);
                    }
                    i += 2;
                    parameters.append(array, i, array.length - i);
                    break;
                } else {
                    reference.append(c);
                }
            } else {
                reference.append(c);
                escaped = false;
            }
        }
    }

    private int countFirstChar(char[] array, int i, char c)
    {
        int nb = 0;
        for (; i < array.length && array[i] == c; ++i) {
            ++nb;
        }

        return nb;
    }
}