/**
    * 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.s3.blobstore;
  
  import static com.google.common.base.Preconditions.checkNotNull;
  
  import java.util.Map;
  import java.util.Set;
  import java.util.concurrent.ExecutorService;
  
  import javax.inject.Inject;
  import javax.inject.Named;
  import javax.inject.Provider;
  import javax.inject.Singleton;
  
  import org.jclouds.Constants;
  import org.jclouds.blobstore.BlobStoreContext;
  import org.jclouds.blobstore.domain.Blob;
  import org.jclouds.blobstore.domain.BlobMetadata;
  import org.jclouds.blobstore.domain.PageSet;
  import org.jclouds.blobstore.domain.StorageMetadata;
  import org.jclouds.blobstore.domain.internal.PageSetImpl;
  import org.jclouds.blobstore.functions.BlobToHttpGetOptions;
  import org.jclouds.blobstore.internal.BaseAsyncBlobStore;
  import org.jclouds.blobstore.options.CreateContainerOptions;
  import org.jclouds.blobstore.options.ListContainerOptions;
  import org.jclouds.blobstore.options.PutOptions;
  import org.jclouds.blobstore.strategy.internal.FetchBlobMetadata;
  import org.jclouds.blobstore.util.BlobUtils;
  import org.jclouds.collect.Memoized;
  import org.jclouds.concurrent.Futures;
  import org.jclouds.domain.Location;
  import org.jclouds.http.options.GetOptions;
  import org.jclouds.s3.S3AsyncClient;
  import org.jclouds.s3.S3Client;
  import org.jclouds.s3.blobstore.functions.BlobToObject;
  import org.jclouds.s3.blobstore.functions.BucketToResourceList;
  import org.jclouds.s3.blobstore.functions.BucketToResourceMetadata;
  import org.jclouds.s3.blobstore.functions.ContainerToBucketListOptions;
  import org.jclouds.s3.blobstore.functions.ObjectToBlob;
  import org.jclouds.s3.blobstore.functions.ObjectToBlobMetadata;
  import org.jclouds.s3.domain.AccessControlList;
  import org.jclouds.s3.domain.AccessControlList.GroupGranteeURI;
  import org.jclouds.s3.domain.AccessControlList.Permission;
  import org.jclouds.s3.domain.BucketMetadata;
  import org.jclouds.s3.domain.CannedAccessPolicy;
  import org.jclouds.s3.domain.ListBucketResponse;
  import org.jclouds.s3.domain.ObjectMetadata;
  import org.jclouds.s3.options.ListBucketOptions;
  import org.jclouds.s3.options.PutBucketOptions;
  import org.jclouds.s3.options.PutObjectOptions;
  import org.jclouds.s3.util.S3Utils;
  
  import com.google.common.base.Function;
  import com.google.common.base.Supplier;
  import com.google.common.collect.Iterables;
  import com.google.common.util.concurrent.ListenableFuture;
  
  /**
   * 
   * @author Adrian Cole
   */
  @Singleton
  public class S3AsyncBlobStore extends BaseAsyncBlobStore {
  
     private final S3AsyncClient async;
     private final S3Client sync;
     private final BucketToResourceMetadata bucket2ResourceMd;
     private final ContainerToBucketListOptions container2BucketListOptions;
     private final BlobToHttpGetOptions blob2ObjectGetOptions;
     private final BucketToResourceList bucket2ResourceList;
     private final ObjectToBlob object2Blob;
     private final BlobToObject blob2Object;
     private final ObjectToBlobMetadata object2BlobMd;
     private final Provider<FetchBlobMetadata> fetchBlobMetadataProvider;
     private final Map<String, AccessControlList> bucketAcls;
  
     @Inject
     protected S3AsyncBlobStore(BlobStoreContext context, BlobUtils blobUtils,
           @Named(Constants.PROPERTY_USER_THREADS) ExecutorService service, Supplier<Location> defaultLocation,
           @Memoized Supplier<Set<? extends Location>> locations, S3AsyncClient async, S3Client sync,
           BucketToResourceMetadata bucket2ResourceMd, ContainerToBucketListOptions container2BucketListOptions,
           BucketToResourceList bucket2ResourceList, ObjectToBlob object2Blob,
          BlobToHttpGetOptions blob2ObjectGetOptions, BlobToObject blob2Object, ObjectToBlobMetadata object2BlobMd,
          Provider<FetchBlobMetadata> fetchBlobMetadataProvider, Map<String, AccessControlList> bucketAcls) {
       super(context, blobUtils, service, defaultLocation, locations);
       this.blob2ObjectGetOptions = checkNotNull(blob2ObjectGetOptions, "blob2ObjectGetOptions");
       this.async = checkNotNull(async, "async");
       this.sync = checkNotNull(sync, "sync");
       this.bucket2ResourceMd = checkNotNull(bucket2ResourceMd, "bucket2ResourceMd");
       this.container2BucketListOptions = checkNotNull(container2BucketListOptions, "container2BucketListOptions");
       this.bucket2ResourceList = checkNotNull(bucket2ResourceList, "bucket2ResourceList");
       this.object2Blob = checkNotNull(object2Blob, "object2Blob");
       this.blob2Object = checkNotNull(blob2Object, "blob2Object");
       this.object2BlobMd = checkNotNull(object2BlobMd, "object2BlobMd");
       this.fetchBlobMetadataProvider = checkNotNull(fetchBlobMetadataProvider, "fetchBlobMetadataProvider");
       this.bucketAcls = checkNotNull(bucketAcls, "bucketAcls");
    }
 
    /**
     * This implementation invokes {@link S3AsyncClient#listOwnedBuckets}
     */
    @Override
    public ListenableFuture<PageSet<? extends StorageMetadata>> list() {
       return Futures.compose(async.listOwnedBuckets(),
             new Function<Set<BucketMetadata>, org.jclouds.blobstore.domain.PageSet<? extends StorageMetadata>>() {
                public org.jclouds.blobstore.domain.PageSet<? extends StorageMetadata> apply(Set<BucketMetadata> from) {
                   return new PageSetImpl<StorageMetadata>(Iterables.transform(from, bucket2ResourceMd), null);
                }
             }, service);
    }
 
    /**
     * This implementation invokes {@link S3AsyncClient#bucketExists}
     * 
     * @param container
     *           bucket name
     */
    @Override
    public ListenableFuture<Boolean> containerExists(String container) {
       return async.bucketExists(container);
    }
 
    /**
     * This implementation invokes {@link S3AsyncClient#putBucketInRegion}
     * 
     * @param location
     *           corresponds to Region
     * @param container
     *           bucket name
     */
    @Override
    public ListenableFuture<Boolean> createContainerInLocation(Location location, String container) {
       return createContainerInLocation(location, container, CreateContainerOptions.NONE);
    }
 
    /**
     * This implementation invokes {@link S3AsyncClient#listBucket}
     * 
     * @param container
     *           bucket name
     */
    @Override
    // TODO get rid of compose, as it serializes async results when the executor is single-threaded.
    public ListenableFuture<PageSet<? extends StorageMetadata>> list(String container, ListContainerOptions options) {
       ListBucketOptions httpOptions = container2BucketListOptions.apply(options);
       ListenableFuture<ListBucketResponse> returnVal = async.listBucket(container, httpOptions);
       ListenableFuture<PageSet<? extends StorageMetadata>> list = Futures.compose(returnVal, bucket2ResourceList,
             service);
       return (options.isDetailed()) ? Futures.compose(list,
             fetchBlobMetadataProvider.get().setContainerName(container), service) : list;
    }
 
    /**
     * This implementation invokes {@link S3Utils#deleteAndVerifyContainerGone}
     */
    protected boolean deleteAndVerifyContainerGone(final String container) {
       return S3Utils.deleteAndVerifyContainerGone(sync, container);
    }
 
    /**
     * This implementation invokes {@link S3AsyncClient#objectExists}
     * 
     * @param container
     *           bucket name
     * @param key
     *           object key
     */
    @Override
    public ListenableFuture<Boolean> blobExists(String container, String key) {
       return async.objectExists(container, key);
    }
 
    /**
     * This implementation invokes {@link S3AsyncClient#headObject}
     * 
     * @param container
     *           bucket name
     * @param key
     *           object key
     */
    @Override
    public ListenableFuture<BlobMetadata> blobMetadata(String container, String key) {
       return Futures.compose(async.headObject(container, key), new Function<ObjectMetadata, BlobMetadata>() {
 
          @Override
          public BlobMetadata apply(ObjectMetadata from) {
             return object2BlobMd.apply(from);
          }
 
       }, service);
    }
 
    /**
     * This implementation invokes {@link S3AsyncClient#getObject}
     * 
     * @param container
     *           bucket name
     * @param key
     *           object key
     */
    @Override
    public ListenableFuture<Blob> getBlob(String container, String key, org.jclouds.blobstore.options.GetOptions options) {
       GetOptions httpOptions = blob2ObjectGetOptions.apply(options);
       return Futures.compose(async.getObject(container, key, httpOptions), object2Blob, service);
    }
 
    /**
     * This implementation invokes {@link S3AsyncClient#putObject}
     * 
     * @param container
     *           bucket name
     * @param blob
     *           object
     */
    @Override
    public ListenableFuture<String> putBlob(String container, Blob blob) {
       PutObjectOptions options = new PutObjectOptions();
       try {
          AccessControlList acl = bucketAcls.get(container);
          if (acl != null && acl.hasPermission(GroupGranteeURI.ALL_USERS, Permission.READ))
             options.withAcl(CannedAccessPolicy.PUBLIC_READ);
       } catch (NullPointerException e) {
          // MapMaker
       }
       return async.putObject(container, blob2Object.apply(blob), options);
    }
 
    /**
     * This implementation invokes {@link S3AsyncClient#deleteObject}
     * 
     * @param container
     *           bucket name
     * @param key
     *           object key
     */
    @Override
    public ListenableFuture<Void> removeBlob(String container, String key) {
       return async.deleteObject(container, key);
    }
 
    @Override
    public ListenableFuture<String> putBlob(String container, Blob blob, PutOptions options) {
       // TODO implement options
       return putBlob(container, blob);
    }
 
    @Override
    public ListenableFuture<Boolean> createContainerInLocation(Location location, String container,
          CreateContainerOptions options) {
       PutBucketOptions putBucketOptions = new PutBucketOptions();
       if (options.isPublicRead())
          putBucketOptions.withBucketAcl(CannedAccessPolicy.PUBLIC_READ);
       location = location != null ? location : defaultLocation.get();
       return async.putBucketInRegion(location.getId(), container, putBucketOptions);
    }
 
 }