/*
 * Minio Cloud Storage, (C) 2016 Minio, Inc.
 *
 * 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 cmd

import (
	"io"
	"time"

	"github.com/minio/minio/pkg/hash"
)

// ObjectLayer implements primitives for object API layer.
type ObjectLayer interface {
	// Storage operations.
	Shutdown() error
	StorageInfo() StorageInfo

	// Bucket operations.
	MakeBucketWithLocation(bucket string, location string) error
	GetBucketInfo(bucket string) (bucketInfo BucketInfo, err error)
	ListBuckets() (buckets []BucketInfo, err error)
	DeleteBucket(bucket string) error
	ListObjects(bucket, prefix, marker, delimiter string, maxKeys int) (result ListObjectsInfo, err error)

	// Object operations.
	GetObject(bucket, object string, startOffset int64, length int64, writer io.Writer, etag string) (err error)
	GetObjectInfo(bucket, object string) (objInfo ObjectInfo, err error)
	PutObject(bucket, object string, data *hash.Reader, metadata map[string]string) (objInfo ObjectInfo, err error)
	CopyObject(srcBucket, srcObject, destBucket, destObject string, metadata map[string]string, srcETag string) (objInfo ObjectInfo, err error)
	DeleteObject(bucket, object string) error

	// Multipart operations.
	ListMultipartUploads(bucket, prefix, keyMarker, uploadIDMarker, delimiter string, maxUploads int) (result ListMultipartsInfo, err error)
	NewMultipartUpload(bucket, object string, metadata map[string]string) (uploadID string, err error)
	CopyObjectPart(srcBucket, srcObject, destBucket, destObject string, uploadID string, partID int, startOffset int64, length int64, metadata map[string]string, srcEtag string) (info PartInfo, err error)
	PutObjectPart(bucket, object, uploadID string, partID int, data *hash.Reader) (info PartInfo, err error)
	ListObjectParts(bucket, object, uploadID string, partNumberMarker int, maxParts int) (result ListPartsInfo, err error)
	AbortMultipartUpload(bucket, object, uploadID string) error
	CompleteMultipartUpload(bucket, object, uploadID string, uploadedParts []CompletePart) (objInfo ObjectInfo, err error)

	// Healing operations.
	HealBucket(bucket string) error
	ListBucketsHeal() (buckets []BucketInfo, err error)
	HealObject(bucket, object string) (int, int, error)
	ListObjectsHeal(bucket, prefix, marker, delimiter string, maxKeys int) (ListObjectsInfo, error)
	ListUploadsHeal(bucket, prefix, marker, uploadIDMarker,
		delimiter string, maxUploads int) (ListMultipartsInfo, error)

	// Locking operations
	ListLocks(bucket, prefix string, duration time.Duration) ([]VolumeLockInfo, error)
	ClearLocks([]VolumeLockInfo) error
}