/*
 * Minio Cloud 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 cmd

import (
	"fmt"
	"io"
)

// Converts underlying storage error. Convenience function written to
// handle all cases where we have known types of errors returned by
// underlying storage layer.
func toObjectErr(err error, params ...string) error {
	e, ok := err.(*Error)
	if ok {
		err = e.e
	}

	switch err {
	case errVolumeNotFound:
		if len(params) >= 1 {
			err = BucketNotFound{Bucket: params[0]}
		}
	case errVolumeNotEmpty:
		if len(params) >= 1 {
			err = BucketNotEmpty{Bucket: params[0]}
		}
	case errVolumeExists:
		if len(params) >= 1 {
			err = BucketExists{Bucket: params[0]}
		}
	case errDiskFull:
		err = StorageFull{}
	case errFileAccessDenied:
		if len(params) >= 2 {
			err = PrefixAccessDenied{
				Bucket: params[0],
				Object: params[1],
			}
		}
	case errIsNotRegular, errFileAccessDenied:
		if len(params) >= 2 {
			err = ObjectExistsAsDirectory{
				Bucket: params[0],
				Object: params[1],
			}
		}
	case errFileNotFound:
		if len(params) >= 2 {
			err = ObjectNotFound{
				Bucket: params[0],
				Object: params[1],
			}
		}
	case errFileNameTooLong:
		if len(params) >= 2 {
			err = ObjectNameInvalid{
				Bucket: params[0],
				Object: params[1],
			}
		}
	case errDataTooLarge:
		if len(params) >= 2 {
			err = ObjectTooLarge{
				Bucket: params[0],
				Object: params[1],
			}
		}
	case errDataTooSmall:
		if len(params) >= 2 {
			err = ObjectTooSmall{
				Bucket: params[0],
				Object: params[1],
			}
		}
	case errXLReadQuorum:
		err = InsufficientReadQuorum{}
	case errXLWriteQuorum:
		err = InsufficientWriteQuorum{}
	case io.ErrUnexpectedEOF, io.ErrShortWrite:
		err = IncompleteBody{}
	case errContentSHA256Mismatch:
		err = SHA256Mismatch{}
	}
	if ok {
		e.e = err
		return e
	}
	return err
}

// SHA256Mismatch - when content sha256 does not match with what was sent from client.
type SHA256Mismatch struct{}

func (e SHA256Mismatch) Error() string {
	return "sha256 computed does not match with what is expected"
}

// SignatureDoesNotMatch - when content md5 does not match with what was sent from client.
type SignatureDoesNotMatch struct{}

func (e SignatureDoesNotMatch) Error() string {
	return "The request signature we calculated does not match the signature you provided. Check your key and signing method."
}

// StorageFull storage ran out of space.
type StorageFull struct{}

func (e StorageFull) Error() string {
	return "Storage reached its minimum free disk threshold."
}

// InsufficientReadQuorum storage cannot satisfy quorum for read operation.
type InsufficientReadQuorum struct{}

func (e InsufficientReadQuorum) Error() string {
	return "Storage resources are insufficient for the read operation."
}

// InsufficientWriteQuorum storage cannot satisfy quorum for write operation.
type InsufficientWriteQuorum struct{}

func (e InsufficientWriteQuorum) Error() string {
	return "Storage resources are insufficient for the write operation."
}

// GenericError - generic object layer error.
type GenericError struct {
	Bucket string
	Object string
}

// BucketNotFound bucket does not exist.
type BucketNotFound GenericError

func (e BucketNotFound) Error() string {
	return "Bucket not found: " + e.Bucket
}

// BucketAlreadyExists the requested bucket name is not available.
type BucketAlreadyExists GenericError

func (e BucketAlreadyExists) Error() string {
	return "The requested bucket name is not available. The bucket namespace is shared by all users of the system. Please select a different name and try again."
}

// BucketAlreadyOwnedByYou already owned by you.
type BucketAlreadyOwnedByYou GenericError

func (e BucketAlreadyOwnedByYou) Error() string {
	return "Bucket already owned by you: " + e.Bucket
}

// BucketNotEmpty bucket is not empty.
type BucketNotEmpty GenericError

func (e BucketNotEmpty) Error() string {
	return "Bucket not empty: " + e.Bucket
}

// ObjectNotFound object does not exist.
type ObjectNotFound GenericError

func (e ObjectNotFound) Error() string {
	return "Object not found: " + e.Bucket + "#" + e.Object
}

// ObjectExistsAsDirectory object already exists as a directory.
type ObjectExistsAsDirectory GenericError

func (e ObjectExistsAsDirectory) Error() string {
	return "Object exists on : " + e.Bucket + " as directory " + e.Object
}

//PrefixAccessDenied object access is denied.
type PrefixAccessDenied GenericError

func (e PrefixAccessDenied) Error() string {
	return "Prefix access is denied: " + e.Bucket + "/" + e.Object
}

// BucketExists bucket exists.
type BucketExists GenericError

func (e BucketExists) Error() string {
	return "Bucket exists: " + e.Bucket
}

// BadDigest - Content-MD5 you specified did not match what we received.
type BadDigest struct {
	ExpectedMD5   string
	CalculatedMD5 string
}

func (e BadDigest) Error() string {
	return "Bad digest: Expected " + e.ExpectedMD5 + " is not valid with what we calculated " + e.CalculatedMD5
}

// UnsupportedDelimiter - unsupported delimiter.
type UnsupportedDelimiter struct {
	Delimiter string
}

func (e UnsupportedDelimiter) Error() string {
	return fmt.Sprintf("delimiter '%s' is not supported. Only '/' is supported", e.Delimiter)
}

// InvalidUploadIDKeyCombination - invalid upload id and key marker combination.
type InvalidUploadIDKeyCombination struct {
	UploadIDMarker, KeyMarker string
}

func (e InvalidUploadIDKeyCombination) Error() string {
	return fmt.Sprintf("Invalid combination of uploadID marker '%s' and marker '%s'", e.UploadIDMarker, e.KeyMarker)
}

// InvalidMarkerPrefixCombination - invalid marker and prefix combination.
type InvalidMarkerPrefixCombination struct {
	Marker, Prefix string
}

func (e InvalidMarkerPrefixCombination) Error() string {
	return fmt.Sprintf("Invalid combination of marker '%s' and prefix '%s'", e.Marker, e.Prefix)
}

// BucketPolicyNotFound - no bucket policy found.
type BucketPolicyNotFound GenericError

func (e BucketPolicyNotFound) Error() string {
	return "No bucket policy found for bucket: " + e.Bucket
}

/// Bucket related errors.

// BucketNameInvalid - bucketname provided is invalid.
type BucketNameInvalid GenericError

// Return string an error formatted as the given text.
func (e BucketNameInvalid) Error() string {
	return "Bucket name invalid: " + e.Bucket
}

/// Object related errors.

// ObjectNameInvalid - object name provided is invalid.
type ObjectNameInvalid GenericError

// Return string an error formatted as the given text.
func (e ObjectNameInvalid) Error() string {
	return "Object name invalid: " + e.Bucket + "#" + e.Object
}

// AllAccessDisabled All access to this object has been disabled
type AllAccessDisabled GenericError

// Return string an error formatted as the given text.
func (e AllAccessDisabled) Error() string {
	return "All access to this object has been disabled"
}

// IncompleteBody You did not provide the number of bytes specified by the Content-Length HTTP header.
type IncompleteBody GenericError

// Return string an error formatted as the given text.
func (e IncompleteBody) Error() string {
	return e.Bucket + "#" + e.Object + "has incomplete body"
}

// InvalidRange - invalid range typed error.
type InvalidRange struct {
	offsetBegin  int64
	offsetEnd    int64
	resourceSize int64
}

func (e InvalidRange) Error() string {
	return fmt.Sprintf("The requested range \"bytes %d-%d/%d\" is not satisfiable.", e.offsetBegin, e.offsetEnd, e.resourceSize)
}

// ObjectTooLarge error returned when the size of the object > max object size allowed (5G) per request.
type ObjectTooLarge GenericError

func (e ObjectTooLarge) Error() string {
	return "size of the object greater than what is allowed(5G)"
}

// ObjectTooSmall error returned when the size of the object < what is expected.
type ObjectTooSmall GenericError

func (e ObjectTooSmall) Error() string {
	return "size of the object less than what is expected"
}

/// Multipart related errors.

// MalformedUploadID malformed upload id.
type MalformedUploadID struct {
	UploadID string
}

func (e MalformedUploadID) Error() string {
	return "Malformed upload id " + e.UploadID
}

// InvalidUploadID invalid upload id.
type InvalidUploadID struct {
	UploadID string
}

func (e InvalidUploadID) Error() string {
	return "Invalid upload id " + e.UploadID
}

// InvalidPart One or more of the specified parts could not be found
type InvalidPart struct{}

func (e InvalidPart) Error() string {
	return "One or more of the specified parts could not be found"
}

// PartTooSmall - error if part size is less than 5MB.
type PartTooSmall struct {
	PartSize   int64
	PartNumber int
	PartETag   string
}

func (e PartTooSmall) Error() string {
	return fmt.Sprintf("Part size for %d should be atleast 5MB", e.PartNumber)
}

// NotImplemented If a feature is not implemented
type NotImplemented struct{}

func (e NotImplemented) Error() string {
	return "Not Implemented"
}

// NotSupported If a feature is not supported
type NotSupported struct{}

func (e NotSupported) Error() string {
	return "Not Supported"
}

// PolicyNesting - policy nesting conflict.
type PolicyNesting struct{}

func (e PolicyNesting) Error() string {
	return "New bucket policy conflicts with an existing policy. Please try again with new prefix."
}

// PolicyNotFound - policy not found
type PolicyNotFound GenericError

func (e PolicyNotFound) Error() string {
	return "Policy not found"
}

// Check if error type is IncompleteBody.
func isErrIncompleteBody(err error) bool {
	err = errorCause(err)
	switch err.(type) {
	case IncompleteBody:
		return true
	}
	return false
}

// Check if error type is BucketPolicyNotFound.
func isErrBucketPolicyNotFound(err error) bool {
	err = errorCause(err)
	switch err.(type) {
	case BucketPolicyNotFound:
		return true
	}
	return false
}

// Check if error type is ObjectNotFound.
func isErrObjectNotFound(err error) bool {
	err = errorCause(err)
	switch err.(type) {
	case ObjectNotFound:
		return true
	}
	return false
}