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/*
 * Beangle, Agile Java/Scala Development Scaffold and Toolkit
 *
 * Copyright (c) 2005-2013, Beangle Software.
 *
 * Beangle is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Beangle is distributed in the hope that it will be useful.
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with Beangle.  If not, see .
 */
package org.beangle.struts2.action;

import java.util.HashSet;
import java.util.Locale;
import java.util.Set;

import org.beangle.commons.bean.PropertyUtils;
import org.beangle.commons.lang.Option;
import org.beangle.commons.lang.Strings;
import org.beangle.commons.text.i18n.TextBundle;
import org.beangle.commons.text.i18n.TextBundleRegistry;
import org.beangle.commons.text.i18n.TextFormater;
import org.beangle.commons.text.i18n.impl.DefaultTextResource;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionInvocation;
import com.opensymphony.xwork2.util.ValueStack;

public class ActionTextResource extends DefaultTextResource {

  private final Class actionClass;
  private final ValueStack valueStack;

  public ActionTextResource(Class actionClass, Locale locale, TextBundleRegistry registry,
      TextFormater formater, ValueStack valueStack) {
    super(locale, registry, formater);
    this.actionClass = actionClass;
    this.valueStack = valueStack;
  }

  /**
   * 1 remove index key(user.roles[0].name etc.)
   * 2 change ModelDriven to EntitySupport
   * 3 remove superclass and interface lookup
   */
  @Override
  protected String getText(String key, Locale locale) {
    if (key == null) return "";
    Set checked = new HashSet(5);
    // search up class hierarchy
    String msg = getMessage(actionClass.getName(), locale, key);
    if (msg != null) return msg;
    // nothing still? all right, search the package hierarchy now
    msg = getPackageMessage(actionClass.getName(), key, checked);
    if (msg != null) return msg;

    if (EntityDrivenAction.class.isAssignableFrom(actionClass)) {
      ActionContext context = ActionContext.getContext();
      // search up model's class hierarchy
      ActionInvocation actionInvocation = context.getActionInvocation();
      // ActionInvocation may be null if we're being run from a Sitemesh filter
      if (actionInvocation != null) {
        Object action = actionInvocation.getAction();
        if (action instanceof EntityDrivenAction) {
          String entityName = ((EntityDrivenAction) action).getEntityName();
          if (entityName != null) {
            msg = getPackageMessage(entityName, key, checked);
            if (msg != null) return msg;
          }
        }
      }
    }

    // see if it's a child property
    int idx = key.indexOf(".");
    if (idx > 0) {
      String prop = key.substring(0, idx);
      Object obj = valueStack.findValue(prop);
      if (null != obj && !prop.equals("action")) {
        Class aClass = obj.getClass();
        String newKey = key;
        while (null != aClass) {
          msg = getPackageMessage(aClass.getName(), newKey, checked);
          if (null == msg) {
            int nextIdx = newKey.indexOf(".", idx + 1);
            if (nextIdx == -1) break;
            prop = newKey.substring(idx + 1, nextIdx);
            newKey = newKey.substring(idx + 1);
            idx = nextIdx;
            if (Strings.isNotEmpty(prop)) aClass = PropertyUtils.getPropertyType(aClass, prop);
            else aClass = null;
          } else {
            return msg;
          }
        }
      }
    }
    return registry.getDefaultText(key, locale);
  }

  private String getPackageMessage(String className, String key, Set checked) {
    String msg = null;
    String baseName = className;
    while (baseName.lastIndexOf('.') != -1) {
      baseName = baseName.substring(0, baseName.lastIndexOf('.'));
      if (checked.contains(baseName)) continue;
      msg = getMessage(baseName + ".package", locale, key);
      if (msg != null) return msg;
      checked.add(baseName);
    }
    return null;
  }

  /**
   * Gets the message from the named resource bundle.
   */
  private String getMessage(String bundleName, Locale locale, String key) {
    Option bundle = registry.load(locale, bundleName);
    return bundle.isDefined() ? bundle.get().getText(key) : null;
  }
}