package s3api

import (
	"encoding/xml"
	"net/http"
)

// APIError structure
type APIError struct {
	Code           string
	Description    string
	HTTPStatusCode int
}

// RESTErrorResponse - error response format
type RESTErrorResponse struct {
	XMLName   xml.Name `xml:"Error" json:"-"`
	Code      string   `xml:"Code" json:"Code"`
	Message   string   `xml:"Message" json:"Message"`
	Resource  string   `xml:"Resource" json:"Resource"`
	RequestID string   `xml:"RequestId" json:"RequestId"`
}

// ErrorCode type of error status.
type ErrorCode int

// Error codes, see full list at http://docs.aws.amazon.com/AmazonS3/latest/API/ErrorResponses.html
const (
	ErrNone ErrorCode = iota
	ErrMethodNotAllowed
	ErrBucketNotEmpty
	ErrBucketAlreadyExists
	ErrBucketAlreadyOwnedByYou
	ErrNoSuchBucket
	ErrNoSuchUpload
	ErrInvalidBucketName
	ErrInvalidDigest
	ErrInvalidMaxKeys
	ErrInvalidMaxUploads
	ErrInvalidMaxParts
	ErrInvalidPartNumberMarker
	ErrInvalidPart
	ErrInternalError
	ErrInvalidCopyDest
	ErrInvalidCopySource
	ErrNotImplemented
)

// error code to APIError structure, these fields carry respective
// descriptions for all the error responses.
var errorCodeResponse = map[ErrorCode]APIError{
	ErrMethodNotAllowed: {
		Code:           "MethodNotAllowed",
		Description:    "The specified method is not allowed against this resource.",
		HTTPStatusCode: http.StatusMethodNotAllowed,
	},
	ErrBucketNotEmpty: {
		Code:           "BucketNotEmpty",
		Description:    "The bucket you tried to delete is not empty",
		HTTPStatusCode: http.StatusConflict,
	},
	ErrBucketAlreadyExists: {
		Code:           "BucketAlreadyExists",
		Description:    "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.",
		HTTPStatusCode: http.StatusConflict,
	},
	ErrBucketAlreadyOwnedByYou: {
		Code:           "BucketAlreadyOwnedByYou",
		Description:    "Your previous request to create the named bucket succeeded and you already own it.",
		HTTPStatusCode: http.StatusConflict,
	},
	ErrInvalidBucketName: {
		Code:           "InvalidBucketName",
		Description:    "The specified bucket is not valid.",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrInvalidDigest: {
		Code:           "InvalidDigest",
		Description:    "The Content-Md5 you specified is not valid.",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrInvalidMaxUploads: {
		Code:           "InvalidArgument",
		Description:    "Argument max-uploads must be an integer between 0 and 2147483647",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrInvalidMaxKeys: {
		Code:           "InvalidArgument",
		Description:    "Argument maxKeys must be an integer between 0 and 2147483647",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrInvalidMaxParts: {
		Code:           "InvalidArgument",
		Description:    "Argument max-parts must be an integer between 0 and 2147483647",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrInvalidPartNumberMarker: {
		Code:           "InvalidArgument",
		Description:    "Argument partNumberMarker must be an integer.",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrNoSuchBucket: {
		Code:           "NoSuchBucket",
		Description:    "The specified bucket does not exist",
		HTTPStatusCode: http.StatusNotFound,
	},
	ErrNoSuchUpload: {
		Code:           "NoSuchUpload",
		Description:    "The specified multipart upload does not exist. The upload ID may be invalid, or the upload may have been aborted or completed.",
		HTTPStatusCode: http.StatusNotFound,
	},
	ErrInternalError: {
		Code:           "InternalError",
		Description:    "We encountered an internal error, please try again.",
		HTTPStatusCode: http.StatusInternalServerError,
	},

	ErrInvalidPart: {
		Code:           "InvalidPart",
		Description:    "One or more of the specified parts could not be found.  The part may not have been uploaded, or the specified entity tag may not match the part's entity tag.",
		HTTPStatusCode: http.StatusBadRequest,
	},

	ErrInvalidCopyDest: {
		Code:           "InvalidRequest",
		Description:    "This copy request is illegal because it is trying to copy an object to itself without changing the object's metadata, storage class, website redirect location or encryption attributes.",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrInvalidCopySource: {
		Code:           "InvalidArgument",
		Description:    "Copy Source must mention the source bucket and key: sourcebucket/sourcekey.",
		HTTPStatusCode: http.StatusBadRequest,
	},

	ErrNotImplemented: {
		Code:           "NotImplemented",
		Description:    "A header you provided implies functionality that is not implemented",
		HTTPStatusCode: http.StatusNotImplemented,
	},
}

// getAPIError provides API Error for input API error code.
func getAPIError(code ErrorCode) APIError {
	return errorCodeResponse[code]
}