/*
 * Copyright 2002-2006,2009 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.opensymphony.xwork2;

import com.opensymphony.xwork2.util.LocalizedTextUtil;
import com.opensymphony.xwork2.util.ValueStack;

import java.util.*;


/**
 * Default TextProvider implementation.
 *
 * @author Jason Carreira
 * @author Rainer Hermanns
 */
public class TextProviderSupport implements ResourceBundleTextProvider {

    private Class clazz;
    private LocaleProvider localeProvider;
    private ResourceBundle bundle;

    /**
     * Default constructor
     */
    public TextProviderSupport() {
    }

    /**
     * Constructor.
     *
     * @param clazz    a clazz to use for reading the resource bundle.
     * @param provider a locale provider.
     */
    public TextProviderSupport(Class clazz, LocaleProvider provider) {
        this.clazz = clazz;
        this.localeProvider = provider;
    }

    /**
     * Constructor.
     *
     * @param bundle   the resource bundle.
     * @param provider a locale provider.
     */
    public TextProviderSupport(ResourceBundle bundle, LocaleProvider provider) {
        this.bundle = bundle;
        this.localeProvider = provider;
    }

    /**
     * @param bundle the resource bundle.
     */
    public void setBundle(ResourceBundle bundle) {
        this.bundle = bundle;
    }

    /**
     * @param clazz a clazz to use for reading the resource bundle.
     */
    public void setClazz(Class clazz) {
        this.clazz = clazz;
    }


    /**
     * @param localeProvider a locale provider.
     */
    public void setLocaleProvider(LocaleProvider localeProvider) {
        this.localeProvider = localeProvider;
    }


    /**
     * Checks if a key is available in the resource bundles associated with this action.
     * The resource bundles are searched, starting with the one associated
     * with this particular action, and testing all its superclasses' bundles.
     * It will stop once a bundle is found that contains the given text. This gives
     * a cascading style that allow global texts to be defined for an application base
     * class.
     */
    public boolean hasKey(String key) {
    	String message;
    	if (clazz != null) {
            message =  LocalizedTextUtil.findText(clazz, key, getLocale(), null, new Object[0] );
        } else {
            message = LocalizedTextUtil.findText(bundle, key, getLocale(), null, new Object[0]);
        }
    	return message != null;
    }

    /**
     * Get a text from the resource bundles associated with this action.
     * The resource bundles are searched, starting with the one associated
     * with this particular action, and testing all its superclasses' bundles.
     * It will stop once a bundle is found that contains the given text. This gives
     * a cascading style that allow global texts to be defined for an application base
     * class.
     *
     * @param key name of text to be found
     * @return value of named text
     */
    public String getText(String key) {
        return getText(key, key, Collections.emptyList());
    }

    /**
     * Get a text from the resource bundles associated with this action.
     * The resource bundles are searched, starting with the one associated
     * with this particular action, and testing all its superclasses' bundles.
     * It will stop once a bundle is found that contains the given text. This gives
     * a cascading style that allow global texts to be defined for an application base
     * class. If no text is found for this text name, the default value is returned.
     *
     * @param key    name of text to be found
     * @param defaultValue the default value which will be returned if no text is found
     * @return value of named text
     */
    public String getText(String key, String defaultValue) {
        return getText(key, defaultValue, Collections.emptyList());
    }

    /**
     * Get a text from the resource bundles associated with this action.
     * The resource bundles are searched, starting with the one associated
     * with this particular action, and testing all its superclasses' bundles.
     * It will stop once a bundle is found that contains the given text. This gives
     * a cascading style that allow global texts to be defined for an application base
     * class. If no text is found for this text name, the default value is returned.
     *
     * @param key    name of text to be found
     * @param defaultValue the default value which will be returned if no text is found
     * @return value of named text
     */
    public String getText(String key, String defaultValue, String arg) {
        List<Object> args = new ArrayList<Object>();
        args.add(arg);
        return getText(key, defaultValue, args);
    }

    /**
     * Get a text from the resource bundles associated with this action.
     * The resource bundles are searched, starting with the one associated
     * with this particular action, and testing all its superclasses' bundles.
     * It will stop once a bundle is found that contains the given text. This gives
     * a cascading style that allow global texts to be defined for an application base
     * class. If no text is found for this text name, the default value is returned.
     *
     * @param key name of text to be found
     * @param args      a List of args to be used in a MessageFormat message
     * @return value of named text
     */
    public String getText(String key, List<Object> args) {
        return getText(key, key, args);
    }

    /**
     * Get a text from the resource bundles associated with this action.
     * The resource bundles are searched, starting with the one associated
     * with this particular action, and testing all its superclasses' bundles.
     * It will stop once a bundle is found that contains the given text. This gives
     * a cascading style that allow global texts to be defined for an application base
     * class. If no text is found for this text name, the default value is returned.
     *
     * @param key name of text to be found
     * @param args      an array of args to be used in a MessageFormat message
     * @return value of named text
     */
    public String getText(String key, String[] args) {
        return getText(key, key, args);
    }

    /**
     * Get a text from the resource bundles associated with this action.
     * The resource bundles are searched, starting with the one associated
     * with this particular action, and testing all its superclasses' bundles.
     * It will stop once a bundle is found that contains the given text. This gives
     * a cascading style that allow global texts to be defined for an application base
     * class. If no text is found for this text name, the default value is returned.
     *
     * @param key    name of text to be found
     * @param defaultValue the default value which will be returned if no text is found
     * @param args         a List of args to be used in a MessageFormat message
     * @return value of named text
     */
    public String getText(String key, String defaultValue, List<Object> args) {
        Object[] argsArray = ((args != null && !args.equals(Collections.emptyList())) ? args.toArray() : null);
        if (clazz != null) {
            return LocalizedTextUtil.findText(clazz, key, getLocale(), defaultValue, argsArray);
        } else {
            return LocalizedTextUtil.findText(bundle, key, getLocale(), defaultValue, argsArray);
        }
    }

    /**
     * Get a text from the resource bundles associated with this action.
     * The resource bundles are searched, starting with the one associated
     * with this particular action, and testing all its superclasses' bundles.
     * It will stop once a bundle is found that contains the given text. This gives
     * a cascading style that allow global texts to be defined for an application base
     * class. If no text is found for this text name, the default value is returned.
     *
     * @param key          name of text to be found
     * @param defaultValue the default value which will be returned if no text is found
     * @param args         an array of args to be used in a MessageFormat message
     * @return value of named text
     */
    public String getText(String key, String defaultValue, String[] args) {
        if (clazz != null) {
            return LocalizedTextUtil.findText(clazz, key, getLocale(), defaultValue, args);
        } else {
            return LocalizedTextUtil.findText(bundle, key, getLocale(), defaultValue, args);
        }
    }

    /**
     * Gets a message based on a key using the supplied args, as defined in
     * {@link java.text.MessageFormat}, or, if the message is not found, a supplied
     * default value is returned. Instead of using the value stack in the ActionContext
     * this version of the getText() method uses the provided value stack.
     *
     * @param key    the resource bundle key that is to be searched for
     * @param defaultValue the default value which will be returned if no message is found
     * @param args         a list args to be used in a {@link java.text.MessageFormat} message
     * @param stack        the value stack to use for finding the text
     * @return the message as found in the resource bundle, or defaultValue if none is found
     */
    public String getText(String key, String defaultValue, List<Object> args, ValueStack stack) {
        Object[] argsArray = ((args != null) ? args.toArray() : null);
        Locale locale;
        if (stack == null){
        	locale = getLocale();
        }else{
        	locale = (Locale) stack.getContext().get(ActionContext.LOCALE);
        }
        if (locale == null) {
            locale = getLocale();
        }
        if (clazz != null) {
            return LocalizedTextUtil.findText(clazz, key, locale, defaultValue, argsArray, stack);
        } else {
            return LocalizedTextUtil.findText(bundle, key, locale, defaultValue, argsArray, stack);
        }
    }


    /**
     * Gets a message based on a key using the supplied args, as defined in
     * {@link java.text.MessageFormat}, or, if the message is not found, a supplied
     * default value is returned. Instead of using the value stack in the ActionContext
     * this version of the getText() method uses the provided value stack.
     *
     * @param key          the resource bundle key that is to be searched for
     * @param defaultValue the default value which will be returned if no message is found
     * @param args         an array args to be used in a {@link java.text.MessageFormat} message
     * @param stack        the value stack to use for finding the text
     * @return the message as found in the resource bundle, or defaultValue if none is found
     */
    public String getText(String key, String defaultValue, String[] args, ValueStack stack) {
        Locale locale;
        if (stack == null){
        	locale = getLocale();
        }else{
        	locale = (Locale) stack.getContext().get(ActionContext.LOCALE);
        }
        if (locale == null) {
            locale = getLocale();
        }
        if (clazz != null) {
            return LocalizedTextUtil.findText(clazz, key, locale, defaultValue, args, stack);
        } else {
            return LocalizedTextUtil.findText(bundle, key, locale, defaultValue, args, stack);
        }

    }

    /**
     * Get the named bundle.
     * <p/>
     * You can override the getLocale() methodName to change the behaviour of how
     * to choose locale for the bundles that are returned. Typically you would
     * use the TextProvider interface to get the users configured locale, or use
     * your own methodName to allow the user to select the locale and store it in
     * the session (by using the SessionAware interface).
     *
     * @param aBundleName bundle name
     * @return a resource bundle
     */
    public ResourceBundle getTexts(String aBundleName) {
        return LocalizedTextUtil.findResourceBundle(aBundleName, getLocale());
    }

    /**
     * Get the resource bundle associated with this action.
     * This will be based on the actual subclass that is used.
     *
     * @return resouce bundle
     */
    public ResourceBundle getTexts() {
        if (clazz != null) {
            return getTexts(clazz.getName());
        }
        return bundle;
    }

    /**
     * Get's the locale from the localeProvider.
     *
     * @return the locale from the localeProvider.
     */
    private Locale getLocale() {
        return localeProvider.getLocale();
    }
}
