package com.c2kernel.utils;

//Java
import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;
import java.util.Hashtable;

import com.c2kernel.common.ObjectNotFoundException;

/**************************************************************************
 *
 * @author $Author: abranson $ $Date: 2005/10/05 07:39:36 $
 * @version $Revision: 1.71 $
 **************************************************************************/
public class Resource {
    static private Hashtable<String, String> txtCache = new Hashtable<String, String>();
    static private URL baseURL = getURLorResURL("com/c2kernel/utils/resources/");
    static private HashMap<String, URL> moduleBaseURLs = new HashMap<String, URL>();

    public static URL getKernelBaseURL() {
        return baseURL;
    }

    public static URL getKernelResourceURL(String resName) throws MalformedURLException {
        return new URL(baseURL, resName);
    }

    public static void addModuleBaseURL(String ns, URL newBaseURL) {
        moduleBaseURLs.put(ns, newBaseURL);
        Logger.msg("Adding resource URL for "+ns+": "+newBaseURL.toString());
    }

    public static void addModuleBaseURL(String ns, String newBaseURL) {
    	addModuleBaseURL(ns, getURLorResURL(newBaseURL));
    }

    public static URL getModuleBaseURL(String ns) {
        return moduleBaseURLs.get(ns);
    }
    
    public static HashMap<String, URL> getModuleBaseURLs() {
        return moduleBaseURLs;
    }

    static public URL getModuleResourceURL(String ns, String resName) throws MalformedURLException {
        return new URL(moduleBaseURLs.get(ns), resName);
    }

    private static URL getURLorResURL(String newURL) {
        URL result;
        try {
            result = new URL(newURL);
        } catch (java.net.MalformedURLException ex) {
            //it is assumed that a 'wrong' URL denotes a directory
            //of files resolvable from the CLASSPATH
            result = Resource.class.getClassLoader().getResource(newURL);
        }
        return result;
    }
    /**************************************************************************
     * Gets any text resource files
     **************************************************************************/
    
    static public String findTextResource(String resName) {
        try {
        	for (String ns : getModuleBaseURLs().keySet()) {
        		try {
        			return getTextResource(ns, resName);
        		} catch (ObjectNotFoundException ex) { }
			}
            return getTextResource(null, resName);
        } catch (ObjectNotFoundException ex) {
            Logger.warning("Text resource '"+resName+"' not found.");
            return null;
        }
    }
    
    static public String getTextResource(String ns, String resName) throws ObjectNotFoundException
    //        throws IOException
    {
        Logger.msg(8, "Resource::getTextResource() - Getting resource: " + resName);

        if (txtCache.containsKey(ns+'/'+resName)) {
            return txtCache.get(ns+'/'+resName);
        }

        try {

            String newRes = null;
            URL loc;
            
            if (ns == null) // kernel
                loc = getKernelResourceURL(resName);
            else
            	loc = getModuleResourceURL(ns, resName);
            newRes = FileStringUtility.url2String(loc);
            txtCache.put(ns+'/'+resName, newRes);
            return newRes;
        } catch (Exception e) {
            throw new ObjectNotFoundException(e.getMessage(),null);
        }
    }

    static public String getKernelVersion() {
    	try {
			return FileStringUtility.url2String(getKernelResourceURL("textFiles/version.txt"));
    	} catch (Exception ex) {
    		return "No version info found";
    	}

    }
}