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/*
 * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package com.sun.xml.rpc.util.localization;

import java.text.MessageFormat;
import java.util.HashMap;
import java.util.Locale;
import java.util.MissingResourceException;
import java.util.ResourceBundle;

import com.sun.xml.rpc.util.exception.LocalizableExceptionAdapter;

/**
 * @author JAX-RPC Development Team
 */
public class Localizer {

	protected Locale _locale;
	protected HashMap _resourceBundles;

	public Localizer() {
		this(Locale.getDefault());
	}

	public Localizer(Locale l) {
		_locale = l;
		_resourceBundles = new HashMap();
	}

	public Locale getLocale() {
		return _locale;
	}

	public String localize(Localizable l) {
		String bundlename = l.getResourceBundleName();

		try {
			ResourceBundle bundle =
				(ResourceBundle) _resourceBundles.get(bundlename);

			if (bundle == null) {
				try {
					bundle = ResourceBundle.getBundle(bundlename, _locale);
				} catch (MissingResourceException e) {
					// work around a bug in the com.sun.enterprise.deployment.WebBundleArchivist:
					//   all files with an extension different from .class (hence all the .properties files)
					//   get copied to the top level directory instead of being in the package where they
					//   are defined
					// so, since we can't find the bundle under its proper name, we look for it under
					//   the top-level package

					int i = bundlename.lastIndexOf('.');
					if (i != -1) {
						String alternateBundleName =
							bundlename.substring(i + 1);
						try {
							bundle =
								ResourceBundle.getBundle(
									alternateBundleName,
									_locale);
						} catch (MissingResourceException e2) {
							// give up
							return getDefaultMessage(l);
						}
					}
				}

				_resourceBundles.put(bundlename, bundle);
			}

			if (bundle == null) {
				return getDefaultMessage(l);
			}

			String key = l.getKey();
			if (key == null)
				key = "undefined";

			String msg = null;
			try {
				msg = bundle.getString(key);
			} catch (MissingResourceException e) {
				// notice that this may throw a MissingResourceException of its own (caught below)
				msg = bundle.getString("undefined");
			}

			// localize all arguments to the given localizable object
			Object[] args = l.getArguments();
			if (args != null) {
				for (int i = 0; i < args.length; ++i) {
					if (args[i] instanceof Localizable)
						args[i] = localize((Localizable) args[i]);
				}
			}

			String message = MessageFormat.format(msg, args);
			return message;

		} catch (MissingResourceException e) {
			return getDefaultMessage(l);
		}

	}

	protected String getDefaultMessage(Localizable l) {
		String key = l.getKey();
		Object[] args = l.getArguments();
		StringBuffer sb = new StringBuffer();
		if (!(l instanceof LocalizableExceptionAdapter)) {
			// avoid to point out the failure to localize an exception that cannot possibly be localized
			sb.append("[failed to localize] ");
		}
		sb.append(String.valueOf(key));
		if (args != null) {
			sb.append('(');
			for (int i = 0; i < args.length; ++i) {
				if (i != 0)
					sb.append(", ");
				sb.append(String.valueOf(args[i]));
			}
			sb.append(')');
		}
		return sb.toString();
	}

}