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package com.thesoftwarefactory.vertx.web.model.impl;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.SequenceInputStream;
import java.net.URL;
import java.net.URLConnection;
import java.nio.charset.Charset;
import java.security.AccessController;
import java.security.PrivilegedActionException;
import java.security.PrivilegedExceptionAction;
import java.util.Enumeration;
import java.util.Locale;
import java.util.Objects;
import java.util.PropertyResourceBundle;
import java.util.ResourceBundle;
import java.util.Vector;

public class CharsetAwareResourceControl extends ResourceBundle.Control {

	private Charset charset;
	public CharsetAwareResourceControl(Charset charset) {
		Objects.requireNonNull(charset);

		this.charset = charset;
	}
	
	/* (non-Javadoc)
	 * @see java.util.ResourceBundle.Control#newBundle(java.lang.String, java.util.Locale, java.lang.String, java.lang.ClassLoader, boolean)
	 */
	@Override
	public ResourceBundle newBundle(String baseName, Locale locale,
			String format, ClassLoader loader, boolean reload)
			throws IllegalAccessException, InstantiationException, IOException {
        String bundleName = toBundleName(baseName, locale);
        ResourceBundle bundle = null;
        if (format.equals("java.class")) {
            try {
                @SuppressWarnings("unchecked")
                Class<? extends ResourceBundle> bundleClass
                    = (Class<? extends ResourceBundle>)loader.loadClass(bundleName);

                // If the class isn't a ResourceBundle subclass, throw a
                // ClassCastException.
                if (ResourceBundle.class.isAssignableFrom(bundleClass)) {
                    bundle = bundleClass.newInstance();
                } else {
                    throw new ClassCastException(bundleClass.getName()
                                 + " cannot be cast to ResourceBundle");
                }
            } catch (ClassNotFoundException e) {
            }
        } else if (format.equals("java.properties")) {
            final String resourceName = toResourceName(bundleName, "properties");
            final ClassLoader classLoader = loader;
            final boolean reloadFlag = reload;
            InputStream stream = null;
            try {
                stream = AccessController.doPrivileged(
                    new PrivilegedExceptionAction<InputStream>() {
                        @Override
						public InputStream run() throws IOException {
                            Vector<InputStream> inputStreams = new Vector<>();
                            Enumeration<URL> urls = classLoader.getResources(resourceName);
                            while (urls.hasMoreElements()) {
                                URL url = urls.nextElement();
                                if (url != null) {
                                    URLConnection connection = url.openConnection();
                                    if (connection != null) {
                                        // Disable caches to get fresh data for
                                        // reloading.
                                        connection.setUseCaches(false);
                                        inputStreams.addElement(connection.getInputStream());
                                    }
                                }
                        	}
                            return inputStreams.size()>0 ? new SequenceInputStream(inputStreams.elements()) : null;
                        }
                    });
            } catch (PrivilegedActionException e) {
                throw (IOException) e.getException();
            }
            if (stream != null) {
                try {
                    bundle = getCharsetAwareBundle(stream, charset);
                } finally {
                    stream.close();
                }
            }
        } else {
            throw new IllegalArgumentException("unknown format: " + format);
        }
        return bundle;
	}

	protected ResourceBundle getCharsetAwareBundle(InputStream inputStream, Charset charset) throws IOException {
	    return new PropertyResourceBundle(new InputStreamReader(inputStream, charset));
	}
    
}
