/**
 * Copyright (C) 2011 Brian Ferris <bdferris@onebusaway.org>
 *
 * 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 org.onebusaway.presentation.tags;

import java.io.IOException;
import java.io.Writer;
import java.util.Locale;

import org.apache.struts2.components.ContextBean;
import org.onebusaway.presentation.services.resources.ResourceService;
import org.springframework.beans.factory.annotation.Autowired;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.util.ValueStack;
import com.opensymphony.xwork2.util.logging.Logger;
import com.opensymphony.xwork2.util.logging.LoggerFactory;

public class ResourceUrlComponent extends ContextBean {

  private static final Logger LOG = LoggerFactory.getLogger(ResourceUrlComponent.class);

  private ResourceService _resourceService;

  private String _value;

  public ResourceUrlComponent(ValueStack stack) {
    super(stack);
  }

  @Autowired
  public void setResourceService(ResourceService resourceService) {
    _resourceService = resourceService;
  }

  public void setValue(String value) {
    _value = value;
  }

  @Override
  public boolean end(Writer writer, String body) {

    if (_value == null)
      _value = "top";

    String value = findStringIfAltSyntax(_value);
    
    Locale locale = Locale.getDefault();
    ActionContext ctx = ActionContext.getContext();
    if (ctx != null)
      locale = ctx.getLocale();

    String url = _resourceService.getExternalUrlForResource(value, locale);

    if (url != null) {
      if (getVar() != null) {
        /**
         * We either write the url out to a variable
         */
        putInContext(url);
      } else {
        /**
         * Or otherwise print out the url directly
         */
        try {
          writer.write(url);
        } catch (IOException e) {
          LOG.error("Could not write out resource-url tag", e);
        }
      }
    }

    return super.end(writer, "");
  }
}