/**
    *
    * Copyright (C) 2011 Cloud Conscious, LLC. <info@cloudconscious.com>
    *
    * ====================================================================
    * 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.jclouds.savvis.vpdc.binders;
  
  import static com.google.common.base.Preconditions.checkArgument;
  import static com.google.common.base.Preconditions.checkNotNull;
  import static com.google.common.base.Preconditions.checkState;
  
  import java.net.URI;
  import java.util.Map;
  import java.util.Properties;
  
  import javax.inject.Singleton;
  import javax.ws.rs.core.MediaType;
  import javax.xml.parsers.FactoryConfigurationError;
  import javax.xml.parsers.ParserConfigurationException;
  
  import org.jclouds.http.HttpRequest;
  import org.jclouds.rest.MapBinder;
  import org.jclouds.rest.binders.BindToStringPayload;
  import org.jclouds.rest.internal.GeneratedHttpRequest;
  import org.jclouds.savvis.vpdc.domain.FirewallRule;
  
  import com.jamesmurty.utils.XMLBuilder;
  
  /**
   * 
   * @author Kedar Dave
   * 
   */
  @Singleton
  public class BindCaptureVAppTemplateToXmlPayload extends BindToStringPayload implements MapBinder {
     @Override
     public <R extends HttpRequest> R bindToRequest(R request, Object toBind) {
        throw new IllegalStateException("BindFirewallRuleToXmlPayload needs parameters");
  
     }
  
     protected URI findVAppURIInArgsOrNull(GeneratedHttpRequest<?> gRequest) {
        for (Object arg : gRequest.getArgs()) {
           if (arg instanceof URI) {
              return (URI) arg;
           } else if (arg instanceof FirewallRule[]) {
          	 URI[] rules = (URI[]) arg;
              return (rules.length > 0) ? rules[0] : null;
           }
        }
        return null;
     }
  
     @Override
     public <R extends HttpRequest> R bindToRequest(R request, Map<String, String> postParams) {
        checkArgument(checkNotNull(request, "request") instanceof GeneratedHttpRequest<?>,
              "this binder is only valid for GeneratedHttpRequests!");
        GeneratedHttpRequest<?> gRequest = (GeneratedHttpRequest<?>) request;
        checkState(gRequest.getArgs() != null, "args should be initialized at this point");
  
        request = super.bindToRequest(request,
              generateXml(findVAppURIInArgsOrNull(gRequest)));
        request.getPayload().getContentMetadata().setContentType(MediaType.APPLICATION_XML);
        return request;
     }
  
     public String generateXml(URI vAppURI) {
        checkNotNull(vAppURI, "vAppURI");
  
        try {
           XMLBuilder rootBuilder = buildRoot();
           addSourceSection(rootBuilder, vAppURI);
           Properties outputProperties = new Properties();
           return rootBuilder.asString(outputProperties);
        } catch (Exception e) {
           return null;
        }
     }
  
     void addSourceSection(XMLBuilder rootBuilder, URI vAppURI) {
        rootBuilder.e("Description").t("Save Template");
        rootBuilder.e("Source").a("href", vAppURI.toString());
     }
  
     protected XMLBuilder buildRoot() throws ParserConfigurationException, FactoryConfigurationError {
        XMLBuilder rootBuilder = XMLBuilder.create("CaptureVAppParams")
             .a("xmlns", "http://schemas.api.sandbox.symphonyVPDC.savvis.net/vpdci")
             .a("name", "CaptureTemplate");
       return rootBuilder;
    }
 
    protected String ifNullDefaultTo(String value, String defaultValue) {
       return value != null ? value : checkNotNull(defaultValue, "defaultValue");
    }
 
 }