// Copyright (c) 2015-2021 MinIO, Inc.
//
// This file is part of MinIO Object Storage stack
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

package hdfs

import (
	"strings"

	"github.com/minio/minio-go/v7/pkg/s3utils"
	minio "github.com/minio/minio/cmd"
)

const (
	// Minio meta bucket.
	minioMetaBucket = ".minio.sys"

	// Minio Tmp meta prefix.
	minioMetaTmpBucket = minioMetaBucket + "/tmp"

	// Minio reserved bucket name.
	minioReservedBucket = "minio"
)

// Ignores all reserved bucket names or invalid bucket names.
func isReservedOrInvalidBucket(bucketEntry string, strict bool) bool {
	bucketEntry = strings.TrimSuffix(bucketEntry, minio.SlashSeparator)
	if strict {
		if err := s3utils.CheckValidBucketNameStrict(bucketEntry); err != nil {
			return true
		}
	} else {
		if err := s3utils.CheckValidBucketName(bucketEntry); err != nil {
			return true
		}
	}
	return isMinioMetaBucket(bucketEntry) || isMinioReservedBucket(bucketEntry)
}

// Returns true if input bucket is a reserved minio meta bucket '.minio.sys'.
func isMinioMetaBucket(bucketName string) bool {
	return bucketName == minioMetaBucket
}

// Returns true if input bucket is a reserved minio bucket 'minio'.
func isMinioReservedBucket(bucketName string) bool {
	return bucketName == minioReservedBucket
}

// byBucketName is a collection satisfying sort.Interface.
type byBucketName []minio.BucketInfo

func (d byBucketName) Len() int           { return len(d) }
func (d byBucketName) Swap(i, j int)      { d[i], d[j] = d[j], d[i] }
func (d byBucketName) Less(i, j int) bool { return d[i].Name < d[j].Name }