/**************************************************************
 * 
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
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 *************************************************************/



package org.openoffice.idesupport.xml;

import java.io.InputStream;
import java.io.OutputStream;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;

import java.util.Enumeration;
import java.util.ArrayList;
import java.util.Iterator;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.NodeList;
import org.w3c.dom.Element;

import com.sun.star.script.framework.container.XMLParserFactory;

public class Manifest {

    private Document document = null;
    private boolean baseElementsExist = false;

    public Manifest(InputStream inputStream) throws IOException {
        document = XMLParserFactory.getParser().parse(inputStream);
    }

    public void add(String entry) {
        add(entry, "");
    }

    private void add(String entry, String type) {
        Element root, el;

        ensureBaseElementsExist();
        
        try {
            root = (Element)
                document.getElementsByTagName("manifest:manifest").item(0);
        
            el = document.createElement("manifest:file-entry");
            el.setAttribute("manifest:media-type", type);
            el.setAttribute("manifest:full-path", entry);
            // System.out.println("added: " + el.toString());
            root.appendChild(el);
        }
        catch (Exception e) {
            System.err.println("Error adding entry: " + e.getMessage());
        }
    }

    private void ensureBaseElementsExist() {
        if (baseElementsExist == false) {
            baseElementsExist = true;
            add("Scripts/", "application/script-parcel");
        }
    }

    public void remove(String entry) {
        Element root, el;
        int len;

        try {
            root = (Element)
                document.getElementsByTagName("manifest:manifest").item(0);
            
            NodeList nl = root.getElementsByTagName("manifest:file-entry");
            if (nl == null || (len = nl.getLength()) == 0)
                return;

            ArrayList list = new ArrayList();
            for (int i = 0; i < len; i++) {
                el = (Element)nl.item(i);
                if (el.getAttribute("manifest:full-path").startsWith(entry)) {
                    // System.out.println("found: " + el.toString());
                    list.add(el);
                }
            }

            Iterator iter = list.iterator();
            while (iter.hasNext())
                root.removeChild((Element)iter.next());

            // System.out.println("and after root is: " + root.toString());
        }
        catch (Exception e) {
            System.err.println("Error removing entry: " + e.getMessage());
        }
    }
    
    public InputStream getInputStream() throws IOException {
        InputStream result = null;
        ByteArrayOutputStream out = null;

        try {
            out = new ByteArrayOutputStream();
            write(out);
            result = new ByteArrayInputStream(out.toByteArray());
            // result = replaceNewlines(out.toByteArray());
        }
        finally {
            if (out != null)
                out.close();
        }

        return result;
    }

    private InputStream replaceNewlines(byte[] bytes) throws IOException {
        InputStream result;
        ByteArrayOutputStream out;
        BufferedReader reader;

        reader = new BufferedReader(new InputStreamReader(
            new ByteArrayInputStream(bytes)));
        out = new ByteArrayOutputStream();

        int previous = reader.read();
        out.write(previous);
        int current;

        while ((current = reader.read()) != -1) {
            if (((char)current == '\n' || (char)current == ' ') &&
                (char)previous == '\n')
                continue;
            else {
                out.write(current);
                previous = current;
            }
        }
        result = new ByteArrayInputStream(out.toByteArray());

        return result;
    }

    public void write(OutputStream out) throws IOException {
        XMLParserFactory.getParser().write(document, out);
    }
}