/**
 * Licensed to jclouds, Inc. (jclouds) under one or more
 * contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  jclouds licenses this file
 * to you 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.atmos.blobstore;

import static com.google.common.base.Preconditions.checkNotNull;
import static org.jclouds.blobstore.util.BlobStoreUtils.cleanRequest;
import static org.jclouds.reflect.Reflection2.method;

import javax.inject.Inject;
import javax.inject.Singleton;

import org.jclouds.atmos.AtmosAsyncClient;
import org.jclouds.atmos.blobstore.functions.BlobToObject;
import org.jclouds.atmos.domain.AtmosObject;
import org.jclouds.atmos.options.PutOptions;
import org.jclouds.blobstore.BlobRequestSigner;
import org.jclouds.blobstore.domain.Blob;
import org.jclouds.blobstore.functions.BlobToHttpGetOptions;
import org.jclouds.http.HttpRequest;
import org.jclouds.http.options.GetOptions;
import org.jclouds.reflect.Invocation;
import org.jclouds.rest.internal.GeneratedHttpRequest;

import com.google.common.base.Function;
import com.google.common.collect.ImmutableList;
import com.google.common.reflect.Invokable;

/**
 * 
 * @author Adrian Cole
 */
@Singleton
public class AtmosBlobRequestSigner implements BlobRequestSigner {
   private final Function<Invocation, HttpRequest> processor;
   private final BlobToObject blobToObject;
   private final BlobToHttpGetOptions blob2ObjectGetOptions;

   private final Invokable<?, ?> getMethod;
   private final Invokable<?, ?> deleteMethod;
   private final Invokable<?, ?> createMethod;

   @Inject
   public AtmosBlobRequestSigner(Function<Invocation, HttpRequest> processor, BlobToObject blobToObject,
         BlobToHttpGetOptions blob2ObjectGetOptions) throws SecurityException, NoSuchMethodException {
      this.processor = checkNotNull(processor, "processor");
      this.blobToObject = checkNotNull(blobToObject, "blobToObject");
      this.blob2ObjectGetOptions = checkNotNull(blob2ObjectGetOptions, "blob2ObjectGetOptions");
      this.getMethod = method(AtmosAsyncClient.class, "readFile", String.class, GetOptions[].class);
      this.deleteMethod = method(AtmosAsyncClient.class, "deletePath", String.class);
      this.createMethod = method(AtmosAsyncClient.class, "createFile", String.class, AtmosObject.class, PutOptions[].class);
   }

   @Override
   public HttpRequest signGetBlob(String container, String name) {
      checkNotNull(container, "container");
      checkNotNull(name, "name");
      return cleanRequest(processor.apply(Invocation.create(getMethod,
            ImmutableList.<Object> of(getPath(container, name)))));
   }

   @Override
   public HttpRequest signGetBlob(String container, String name, long timeInSeconds) {
      throw new UnsupportedOperationException();
   }

   @Override
   public HttpRequest signPutBlob(String container, Blob blob) {
      checkNotNull(container, "container");
      checkNotNull(blob, "blob");
      return cleanRequest(processor.apply(Invocation.create(createMethod,
            ImmutableList.<Object> of(container, blobToObject.apply(blob)))));
   }

   @Override
   public HttpRequest signPutBlob(String container, Blob blob, long timeInSeconds) {
      throw new UnsupportedOperationException();
   }

   @Override
   public HttpRequest signRemoveBlob(String container, String name) {
      checkNotNull(container, "container");
      checkNotNull(name, "name");
      return cleanRequest(processor.apply(Invocation.create(deleteMethod,
            ImmutableList.<Object> of(getPath(container, name)))));
   }

   private String getPath(String container, String name) {
      return checkNotNull(container, "container") + "/" + checkNotNull(name, "name");
   }

   @Override
   public HttpRequest signGetBlob(String container, String name, org.jclouds.blobstore.options.GetOptions options) {
      checkNotNull(container, "container");
      checkNotNull(name, "name");
      return cleanRequest(processor.apply(Invocation.create(getMethod,
            ImmutableList.of(getPath(container, name), blob2ObjectGetOptions.apply(checkNotNull(options, "options"))))));
   }

}