package org.hwo.i18n;

import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;
import java.util.MissingResourceException;
import java.util.Properties;
import java.util.ResourceBundle;

public class Messages {
	
	protected static Messages pInstance;
	protected static List<Messages> instanceList;
	protected static Locale activeLocale;
	
	protected String BUNDLE_NAME = "org.hwo.i18n.messages";
	
	
	private ResourceBundle defaultResourceBundle;
	private ResourceBundle localeResourceBundle;
	private Properties missingKeys;
	private String missingKeysFileName;
	
	protected Messages() {
		initialize();
	}
	
	protected Messages(String bundleName)
	{
		BUNDLE_NAME = bundleName;
		initialize();
	}

	public void saveMissingStrings() {
		
		if (missingKeys != null)
		{			
			FileOutputStream fos;
			try {
				fos = new FileOutputStream(missingKeysFileName);
				System.err.println(String.format("Writing missing strings to %s",missingKeysFileName));

				missingKeys.store(fos, "");
				fos.close();
			} catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
	
	private void initialize()
	{
		System.err.println(this.getClass().getName() + ": Using Locale:" + activeLocale.getCountry() + " / " + activeLocale.getLanguage());
		defaultResourceBundle = ResourceBundle.getBundle(BUNDLE_NAME);
		localeResourceBundle = ResourceBundle.getBundle(BUNDLE_NAME,activeLocale);
		
		instanceList.add(this);
	}
	
	public String getMissingKeysFileName()
	{
		return missingKeysFileName;
	}
	public void setMissingKeysFileName(String fileName)
	{
		missingKeysFileName = fileName;
	}
	
	public void enableMissingKeys()
	{
		missingKeys = new Properties();
	}
	
	public static String getString(String key) {
		for (Messages messages: instanceList)
		{
			if (messages.hasKey(key))
				return messages.getInstanceString(key);
		}
		if (getInstance().missingKeys != null)
		{
			getInstance().missingKeys.setProperty(key, "");
		}
		return key;
	}
	
	public boolean hasKey(String key)
	{
		return localeResourceBundle.containsKey(key) | defaultResourceBundle.containsKey(key);
	}
	
	protected String getInstanceString(String key) throws MissingResourceException
	{
		if (localeResourceBundle.containsKey(key))
			return localeResourceBundle.getString(key);
		if (defaultResourceBundle.containsKey(key))
			return defaultResourceBundle.getString(key);
		throw new MissingResourceException(BUNDLE_NAME, key, "");
	}
	
	public static Messages getInstance()
	{
		return pInstance;
	}
	
	static {
		if (activeLocale == null)
			activeLocale = Locale.getDefault();

		if (instanceList == null)
			instanceList = new LinkedList<Messages>();
		
		if (pInstance == null)
			pInstance = new Messages();
	}
	
}