/*******************************************************************************
 * Copyright (c) 2005-2008 Polarion Software.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *    Igor Burilo - Initial API and implementation
 *******************************************************************************/

package org.eclipse.team.svn.core;

import java.lang.reflect.Field;

import org.eclipse.osgi.util.NLS;

public class BaseMessages extends NLS {

	public static String format(String translatedString, Object arg) {
		return BaseMessages.format(translatedString, new Object[]{arg});
	}
	
	public static String format(String translatedString, Object[] args) {
		return NLS.bind(translatedString, args);
	}
	
    /**
     * Gets a resource string by field name. 
     * This is useful when the field name is constructed ad hoc.
     * 
     * @param key
     * @return
     */
    public static String getString(String key, Class clazz) {
    	if (key == null) {
			return null;
		}
    	
    	if (clazz == null) {
    		return null;
    	}
    	
    	String str = BaseMessages.getRawString(key, clazz);
    	if (str == null) {
    		//System.err.println("Unknown key: " + key + ", class: " + clazz.getName());
    		str = key;
    	}
    	return str;
    }	            
    
    protected static boolean hasString(String key, Class clazz) {
    	return BaseMessages.getRawString(key, clazz) != null;
    }
    
    protected static String getRawString(String key, Class clazz) {
    	String res = null;    	
    	
    	/*
    	 * if key contains not valid characters for java identifier
    	 * then replace not valid characters to underscore
    	 */
    	if (key.indexOf("-") != -1) { //$NON-NLS-1$
    		key = key.replaceAll("-", "_"); //$NON-NLS-1$ //$NON-NLS-2$
    	}
    	
    	try {
    		Field field = clazz.getDeclaredField(key);
    		res = (String)field.get(null);
    	} catch (Exception e) {
    		res = null;
    	}
    	return res;
    } 
    
    /**
     * Convenience method used for error messages,
     * where for message we also add its error identifier 
     * 
     * @param key
     * @return
     */
	public static String getErrorString(String key, Class clazz) {						
		String retVal = BaseMessages.getString(key, clazz);		
		if (BaseMessages.hasString(key, clazz)) {
			if (key.startsWith("Error_")) { //$NON-NLS-1$
				String idKey = key + "_Id"; //$NON-NLS-1$
				if (BaseMessages.hasString(idKey, clazz)) {
					retVal = BaseMessages.getString(idKey, clazz) + ": " + retVal; //$NON-NLS-1$
				}				
			}			
		}
		return retVal;
	}
	
	public static String formatErrorString(String key, Object[] args, Class clazz) {
		String retVal = BaseMessages.getErrorString(key, clazz);
		return BaseMessages.format(retVal, args);
	}
}