/**
    *
    * 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.vcloud.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 static org.jclouds.vcloud.reference.VCloudConstants.PROPERTY_VCLOUD_XML_NAMESPACE;
  import static org.jclouds.vcloud.reference.VCloudConstants.PROPERTY_VCLOUD_XML_SCHEMA;
  
  import java.util.Map;
  import java.util.Properties;
  
  import javax.inject.Named;
  import javax.inject.Singleton;
  import javax.xml.parsers.FactoryConfigurationError;
  import javax.xml.parsers.ParserConfigurationException;
  import javax.xml.transform.TransformerException;
  
  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.vcloud.VCloudMediaType;
  import org.jclouds.vcloud.options.CaptureVAppOptions;
  
  import com.google.inject.Inject;
  import com.jamesmurty.utils.XMLBuilder;
  
  /**
   * 
   * @author Adrian Cole
   * 
   */
  @Singleton
  public class BindCaptureVAppParamsToXmlPayload implements MapBinder {
  
     protected final String ns;
     protected final String schema;
     private final BindToStringPayload stringBinder;
  
     @Inject
     public BindCaptureVAppParamsToXmlPayload(BindToStringPayload stringBinder,
           @Named(PROPERTY_VCLOUD_XML_NAMESPACE) String ns, @Named(PROPERTY_VCLOUD_XML_SCHEMA) String schema) {
        this.ns = ns;
        this.schema = schema;
        this.stringBinder = stringBinder;
     }
  
     @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");
        String templateName = checkNotNull(postParams.remove("templateName"), "templateName");
        String vApp = checkNotNull(postParams.remove("vApp"), "vApp");
  
        CaptureVAppOptions options = findOptionsInArgsOrNull(gRequest);
        if (options == null) {
           options = new CaptureVAppOptions();
        }
        try {
           return stringBinder.bindToRequest(request, generateXml(templateName, vApp, options));
        } catch (ParserConfigurationException e) {
           throw new RuntimeException(e);
        } catch (FactoryConfigurationError e) {
           throw new RuntimeException(e);
        } catch (TransformerException e) {
           throw new RuntimeException(e);
        }
  
     }
  
     protected String generateXml(String templateName, String vApp, CaptureVAppOptions options)
           throws ParserConfigurationException, FactoryConfigurationError, TransformerException {
        XMLBuilder rootBuilder = buildRoot(templateName);
        if (options.getDescription() != null)
           rootBuilder.e("Description").text(options.getDescription());
        rootBuilder.e("Source").a("href", vApp).a("type", VCloudMediaType.VAPP_XML);
        Properties outputProperties = new Properties();
        outputProperties.put(javax.xml.transform.OutputKeys.OMIT_XML_DECLARATION, "yes");
        return rootBuilder.asString(outputProperties);
    }
 
    protected XMLBuilder buildRoot(String name) throws ParserConfigurationException, FactoryConfigurationError {
       XMLBuilder rootBuilder = XMLBuilder.create("CaptureVAppParams").a("name", name).a("xmlns", ns)
             .a("xmlns:xsi", "http://www.w3.org/2001/XMLSchema-instance").a("xsi:schemaLocation", ns + " " + schema);
       return rootBuilder;
    }
 
    protected CaptureVAppOptions findOptionsInArgsOrNull(GeneratedHttpRequest<?> gRequest) {
       for (Object arg : gRequest.getArgs()) {
          if (arg instanceof CaptureVAppOptions) {
             return (CaptureVAppOptions) arg;
          } else if (arg instanceof CaptureVAppOptions[]) {
             CaptureVAppOptions[] options = (CaptureVAppOptions[]) arg;
             return (options.length > 0) ? options[0] : null;
          }
       }
       return null;
    }
 
    @Override
    public <R extends HttpRequest> R bindToRequest(R request, Object input) {
       throw new IllegalStateException("CaptureVAppParams is needs parameters");
    }
 
    protected String ifNullDefaultTo(String value, String defaultValue) {
       return value != null ? value : checkNotNull(defaultValue, "defaultValue");
    }
 }