/*
 * Minimalist Object Storage, (C) 2015 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 donutstorage

import (
	"errors"
	"github.com/minio-io/minio/pkg/storage"
	"io"
)

// DonutDriver creates a new single disk storage driver using donut without encoding.
type DonutDriver struct{}

const (
	blockSize = 10 * 1024 * 1024
)

// Start a single disk subsystem
func Start() (chan<- string, <-chan error, storage.Storage) {
	ctrlChannel := make(chan string)
	errorChannel := make(chan error)
	s := new(DonutDriver)
	go start(ctrlChannel, errorChannel, s)
	return ctrlChannel, errorChannel, s
}

func start(ctrlChannel <-chan string, errorChannel chan<- error, s *DonutDriver) {
	close(errorChannel)
}

// ListBuckets returns a list of buckets
func (donutStorage DonutDriver) ListBuckets() (results []storage.BucketMetadata, err error) {
	return nil, errors.New("Not Implemented")
}

// CreateBucket creates a new bucket
func (donutStorage DonutDriver) CreateBucket(bucket string) error {
	return errors.New("Not Implemented")
}

// GetBucketMetadata retrieves an bucket's metadata
func (donutStorage DonutDriver) GetBucketMetadata(bucket string) (storage.BucketMetadata, error) {
	return storage.BucketMetadata{}, errors.New("Not Implemented")
}

// CreateBucketPolicy sets a bucket's access policy
func (donutStorage DonutDriver) CreateBucketPolicy(bucket string, p storage.BucketPolicy) error {
	return errors.New("Not Implemented")
}

// GetBucketPolicy returns a bucket's access policy
func (donutStorage DonutDriver) GetBucketPolicy(bucket string) (storage.BucketPolicy, error) {
	return storage.BucketPolicy{}, errors.New("Not Implemented")
}

// GetObject retrieves an object and writes it to a writer
func (donutStorage DonutDriver) GetObject(target io.Writer, bucket, key string) (int64, error) {
	return 0, errors.New("Not Implemented")
}

// GetPartialObject retrieves an object and writes it to a writer
func (donutStorage DonutDriver) GetPartialObject(w io.Writer, bucket, object string, start, length int64) (int64, error) {
	return 0, errors.New("Not Implemented")
}

// GetObjectMetadata retrieves an object's metadata
func (donutStorage DonutDriver) GetObjectMetadata(bucket, key string, prefix string) (storage.ObjectMetadata, error) {
	return storage.ObjectMetadata{}, errors.New("Not Implemented")
}

// ListObjects lists objects
func (donutStorage DonutDriver) ListObjects(bucket string, resources storage.BucketResourcesMetadata) ([]storage.ObjectMetadata, storage.BucketResourcesMetadata, error) {
	return nil, storage.BucketResourcesMetadata{}, errors.New("Not Implemented")
}

// CreateObject creates a new object
func (donutStorage DonutDriver) CreateObject(bucketKey, objectKey, contentType, md5sum string, reader io.Reader) error {
	return errors.New("Not Implemented")
}