/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   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 .
 */
package com.sun.star.script.framework.container;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

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

public class ParcelDescriptor {

    // File name to be used for parcel descriptor files
    public static final String
    PARCEL_DESCRIPTOR_NAME = "parcel-descriptor.xml";

    // This is the default contents of a parcel descriptor to be used when
    // creating empty descriptors
    private static final byte[] EMPTY_DOCUMENT =
        ("<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n" +
         "<parcel xmlns:parcel=\"scripting.dtd\" language=\"Java\">\n" +
         "</parcel>").getBytes();

    private Document document = null;
    private String language = null;
    private final Map<String, String> languagedepprops = new HashMap<String, String>(3);

    public ParcelDescriptor() throws IOException {
        ByteArrayInputStream bis = null;

        try {
            bis = new ByteArrayInputStream(EMPTY_DOCUMENT);
            this.document = XMLParserFactory.getParser().parse(bis);
        } finally {
            if (bis != null)
                bis.close();
        }
    }

    private ParcelDescriptor(Document document) {
        this.document = document;
        initLanguageProperties();
    }

    public ParcelDescriptor(InputStream is) throws IOException {
        this(XMLParserFactory.getParser().parse(is));
    }

    public ParcelDescriptor(File file) throws IOException {
        this(file, "Java");
    }

    private ParcelDescriptor(File file, String language) throws IOException {
        if (file.exists()) {
            FileInputStream fis = null;

            try {
                fis = new FileInputStream(file);
                this.document = XMLParserFactory.getParser().parse(fis);
            } finally {
                if (fis != null)
                    fis.close();
            }
        } else {
            ByteArrayInputStream bis = null;

            try {
                bis = new ByteArrayInputStream(EMPTY_DOCUMENT);
                this.document = XMLParserFactory.getParser().parse(bis);
            } finally {
                if (bis != null)
                    bis.close();
            }

            setLanguage(language);
        }

        initLanguageProperties();
    }

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

    public Document getDocument() {
        return document;
    }

    public String getLanguage() {
        if (language == null && document != null) {
            Element e = document.getDocumentElement();
            language = e.getAttribute("language");
        }

        return language;
    }

    public void setLanguage(String language) {
        this.language = language;

        if (document != null) {
            try {
                Element e = document.getDocumentElement();
                e.setAttribute("language", language);
            } catch (DOMException de) {
            }
        }
    }

    public ScriptEntry[] getScriptEntries() {

        ArrayList<ScriptEntry> scripts = new ArrayList<ScriptEntry>();
        NodeList scriptNodes;
        int len;

        if (document == null ||
            (scriptNodes = document.getElementsByTagName("script")) == null ||
            (len = scriptNodes.getLength()) == 0)
            return new ScriptEntry[0];

        for (int i = 0; i < len; i++) {
            String language, languagename, description = "";
            Map<String, String> langProps = new HashMap<String, String>();
            NodeList nl;

            Element scriptElement = (Element)scriptNodes.item(i);
            language = scriptElement.getAttribute("language");

            // get the text of the description element
            nl = scriptElement.getElementsByTagName("locale");

            if (nl != null) {
                nl = nl.item(0).getChildNodes();

                if (nl != null) {
                    for (int j = 0 ; j < nl.getLength(); j++) {
                        if (nl.item(j).getNodeName().equals("description")) {
                            CharacterData cd =
                                (CharacterData)nl.item(j).getFirstChild();
                            description = cd.getData().trim();
                        }
                    }
                }
            }

            nl = scriptElement.getElementsByTagName("functionname");

            if (nl == null) {
                languagename = "";
            } else {
                Element tmp = (Element)nl.item(0);
                languagename = tmp.getAttribute("value");
            }

            nl = scriptElement.getElementsByTagName("languagedepprops");

            if (nl != null && nl.getLength() > 0) {

                NodeList props = ((Element)nl.item(0)).getElementsByTagName("prop");

                if (props != null) {
                    for (int j = 0; j < props.getLength(); j++) {
                        Element tmp = (Element)props.item(j);
                        String key = tmp.getAttribute("name");
                        String val = tmp.getAttribute("value");
                        langProps.put(key, val);
                    }
                }
            }

            ScriptEntry entry =
                new ScriptEntry(language, languagename, langProps, description);
            scripts.add(entry);
        }

        return scripts.toArray(new ScriptEntry[scripts.size()]);
    }

    public void setScriptEntries(ScriptEntry[] scripts) {
        clearEntries();

        for (ScriptEntry script : scripts) {
            addScriptEntry(script);
        }
    }

    public void setScriptEntries(Iterator<ScriptEntry> scripts) {
        clearEntries();

        while (scripts.hasNext()) {
            addScriptEntry(scripts.next());
        }
    }

    private String getLanguageProperty(String name) {
        return languagedepprops.get(name);
    }



    private void initLanguageProperties() {
        NodeList nl = document.getElementsByTagName("languagedepprops");
        int len;

        if (nl != null && (len = nl.getLength()) != 0) {

            for (int i = 0; i < len; i++) {
                Element e = (Element)nl.item(i);
                NodeList nl2 = e.getElementsByTagName("prop");
                int len2;

                if (nl2 != null && (len2 = nl2.getLength()) != 0) {
                    for (int j = 0; j < len2; j++) {
                        Element e2 = (Element)nl2.item(j);

                        String name = e2.getAttribute("name");
                        String value = e2.getAttribute("value");

                        if (getLanguageProperty(name) == null) {
                            languagedepprops.put(name, value);
                        }
                    }
                }
            }
        }
    }

    private void clearEntries() {
        NodeList scriptNodes;
        Element main = document.getDocumentElement();
        int len;

        if ((scriptNodes = document.getElementsByTagName("script")) != null &&
            (len = scriptNodes.getLength()) != 0) {
            for (int i = len - 1; i >= 0; i--) {
                try {
                    main.removeChild(scriptNodes.item(i));
                } catch (DOMException de) {
                    // ignore
                }
            }
        }
    }

    public void removeScriptEntry(ScriptEntry script) {
        NodeList scriptNodes;
        Element main = document.getDocumentElement();
        int len;

        if ((scriptNodes = document.getElementsByTagName("script")) != null &&
            (len = scriptNodes.getLength()) != 0) {
            for (int i = len - 1; i >= 0; i--) {
                try {
                    Element scriptElement = (Element)scriptNodes.item(i);
                    String languagename = "";

                    NodeList nl =
                        scriptElement.getElementsByTagName("functionname");

                    if (nl == null) {
                        continue;
                    } else {
                        Element tmp = (Element)nl.item(0);
                        languagename = tmp.getAttribute("value");
                    }

                    if (languagename.equals(script.getLanguageName())) {
                        main.removeChild(scriptElement);
                    }
                } catch (DOMException de) {
                    // ignore
                }
            }
        }
    }

    public void addScriptEntry(ScriptEntry script) {
        Element main = document.getDocumentElement();
        Element root, item, tempitem;

        root = document.createElement("script");
        root.setAttribute("language", script.getLanguage());

        item = document.createElement("locale");
        item.setAttribute("lang", "en");
        tempitem = document.createElement("displayname");
        tempitem.setAttribute("value", script.getLogicalName());
        item.appendChild(tempitem);

        tempitem = document.createElement("description");
        String description = script.getDescription();

        if (description == null || description.length() == 0) {
            description = script.getLogicalName();
        }

        tempitem.appendChild(document.createTextNode(description));
        item.appendChild(tempitem);

        root.appendChild(item);

        item = document.createElement("logicalname");
        item.setAttribute("value", script.getLogicalName());
        root.appendChild(item);

        item = document.createElement("functionname");
        item.setAttribute("value", script.getLanguageName());
        root.appendChild(item);

        if (languagedepprops != null && !languagedepprops.isEmpty()) {
            String key;
            item = document.createElement("languagedepprops");

            for (Map.Entry<String, String> entry : languagedepprops.entrySet()) {
                tempitem = document.createElement("prop");
                tempitem.setAttribute("name", entry.getKey());
                tempitem.setAttribute("value", entry.getValue());
                item.appendChild(tempitem);
            }

            root.appendChild(item);
        }

        //add to the Top Element
        main.appendChild(root);
    }
}