/*
 * Minio Cloud Storage, (C) 2015, 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 (
	"errors"
	"fmt"
)

// errUnexpected - unexpected error, requires manual intervention.
var errUnexpected = errors.New("Unexpected error, please report this issue at https://github.com/minio/minio/issues")

// errCorruptedFormat - corrupted backend format.
var errCorruptedFormat = errors.New("corrupted backend format, please join https://slack.minio.io for assistance")

// errUnformattedDisk - unformatted disk found.
var errUnformattedDisk = errors.New("unformatted disk found")

// errDiskFull - cannot create volume or files when disk is full.
var errDiskFull = errors.New("disk path full")

// errDiskNotFound - cannot find the underlying configured disk anymore.
var errDiskNotFound = errors.New("disk not found")

// errDiskNotFoundFromNetError - cannot find the underlying configured disk anymore due to network error.
var errDiskNotFoundFromNetError = errors.New("disk not found from net error")

// errDiskNotFoundFromShutdown - cannot find the underlying configured disk anymore due to rpc shutdown.
var errDiskNotFoundFromRPCShutdown = errors.New("disk not found from rpc shutdown")

// errFaultyRemoteDisk - remote disk is faulty.
var errFaultyRemoteDisk = errors.New("remote disk is faulty")

// errFaultyDisk - disk is faulty.
var errFaultyDisk = errors.New("disk is faulty")

// errDiskAccessDenied - we don't have write permissions on disk.
var errDiskAccessDenied = errors.New("disk access denied")

// errFileNotFound - cannot find the file.
var errFileNotFound = errors.New("file not found")

// errFileNameTooLong - given file name is too long than supported length.
var errFileNameTooLong = errors.New("file name too long")

// errVolumeExists - cannot create same volume again.
var errVolumeExists = errors.New("volume already exists")

// errIsNotRegular - not of regular file type.
var errIsNotRegular = errors.New("not of regular file type")

// errVolumeNotFound - cannot find the volume.
var errVolumeNotFound = errors.New("volume not found")

// errVolumeNotEmpty - volume not empty.
var errVolumeNotEmpty = errors.New("volume is not empty")

// errVolumeAccessDenied - cannot access volume, insufficient permissions.
var errVolumeAccessDenied = errors.New("volume access denied")

// errVolumeAccessDenied - cannot access file, insufficient permissions.
var errFileAccessDenied = errors.New("file access denied")

// errBitrotHashAlgoInvalid - the algo for bit-rot hash
// verification is empty or invalid.
var errBitrotHashAlgoInvalid = errors.New("bit-rot hash algorithm is invalid")

// errCrossDeviceLink - rename across devices not allowed.
var errCrossDeviceLink = errors.New("Rename across devices not allowed, please fix your backend configuration")

// hashMisMatchError - represents a bit-rot hash verification failure
// error.
type hashMismatchError struct {
	expected string
	computed string
}

// error method for the hashMismatchError
func (h hashMismatchError) Error() string {
	return fmt.Sprintf(
		"Bitrot verification mismatch - expected %v, received %v",
		h.expected, h.computed)
}

// Collection of basic errors.
var baseErrs = []error{
	errDiskNotFound,
	errFaultyDisk,
	errFaultyRemoteDisk,
}

var baseIgnoredErrs = baseErrs