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/*
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package org.flexdock.util;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Properties;

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


/**
 * @author Christopher Butler
 */
public class OsInfo {
    private static final OsInfo SINGLETON = new OsInfo();
    private static final String XML_RESOURCE = "org/flexdock/util/os-info.xml";

    private String osArch;
    private List osNameList;
    private List osLibraryList;
    private List prefixOsLibraryList;

    public static OsInfo getInstance() {
        return SINGLETON;
    }

    public OsInfo() {
        this(null);
    }

    public OsInfo(Properties systemProps) {
        if(systemProps==null) {
            systemProps = System.getProperties();
        }

        Document doc = ResourceManager.getDocument(XML_RESOURCE);
        osArch = getSystemArch(doc, systemProps);
        osNameList = Collections.unmodifiableList(getOSChain(doc, systemProps));

        ArrayList libList = new ArrayList(osNameList.size());
        ArrayList prefixLibList = new ArrayList(osNameList.size());
        for(Iterator it=osNameList.iterator(); it.hasNext();) {
            String osName = (String)it.next();
            libList.add(osName + "-" + osArch);
        }
        libList.addAll(osNameList);

        for(Iterator it=libList.iterator(); it.hasNext();) {
            String prefixed = "-" + it.next();
            prefixLibList.add(prefixed);
        }

        osLibraryList = Collections.unmodifiableList(libList);
        prefixOsLibraryList = Collections.unmodifiableList(prefixLibList);
    }

    private String getSystemArch(Document doc, Properties systemProps) {
        String archTag = "arch";
        String sysArch = format(systemProps.getProperty("os.arch"));

        Element archElem = findElementByName(doc, archTag, sysArch);
        while(isNested(archElem, archTag)) {
            archElem = (Element)archElem.getParentNode();
        }
        return archElem==null? sysArch: archElem.getAttribute("name");
    }


    private List getOSChain(Document doc, Properties systemProps) {
        String osTag = "os";
        String osName = format(systemProps.getProperty("os.name"));
        Element osElem = findElementByName(doc, osTag, osName);
        ArrayList list = new ArrayList();

        while(osElem!=null && osTag.equals(osElem.getTagName())) {
            list.add(osElem.getAttribute("name"));
            osElem = (Element)osElem.getParentNode();
        }

        if(list.isEmpty()) {
            list.add(osName);
        }
        return list;
    }







    private Element findElementByName(Document doc, String tagName, String nameAttrib) {
        NodeList list = doc.getElementsByTagName(tagName);
        for(int i=0; i