// 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 madmin

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

/* **** SAMPLE ERROR RESPONSE ****
<?xml version="1.0" encoding="UTF-8"?>
<Error>
   <Code>AccessDenied</Code>
   <Message>Access Denied</Message>
   <BucketName>bucketName</BucketName>
   <Key>objectName</Key>
   <RequestId>F19772218238A85A</RequestId>
   <HostId>GuWkjyviSiGHizehqpmsD1ndz5NClSP19DOT+s2mv7gXGQ8/X1lhbDGiIJEXpGFD</HostId>
</Error>
*/

// ErrorResponse - Is the typed error returned by all API operations.
type ErrorResponse struct {
	XMLName    xml.Name `xml:"Error" json:"-"`
	Code       string
	Message    string
	BucketName string
	Key        string
	RequestID  string `xml:"RequestId"`
	HostID     string `xml:"HostId"`

	// Region where the bucket is located. This header is returned
	// only in HEAD bucket and ListObjects response.
	Region string
}

// Error - Returns HTTP error string
func (e ErrorResponse) Error() string {
	return e.Message
}

const (
	reportIssue = "Please report this issue at https://github.com/minio/minio/issues."
)

// httpRespToErrorResponse returns a new encoded ErrorResponse
// structure as error.
func httpRespToErrorResponse(resp *http.Response) error {
	if resp == nil {
		msg := "Response is empty. " + reportIssue
		return ErrInvalidArgument(msg)
	}
	var errResp ErrorResponse
	// Decode the json error
	err := jsonDecoder(resp.Body, &errResp)
	if err != nil {
		return ErrorResponse{
			Code:    resp.Status,
			Message: fmt.Sprintf("Failed to parse server response: %s.", err),
		}
	}
	closeResponse(resp)
	return errResp
}

// ToErrorResponse - Returns parsed ErrorResponse struct from body and
// http headers.
//
// For example:
//
//   import admin "github.com/minio/minio/pkg/madmin"
//   ...
//   ...
//   ss, err := adm.ServiceStatus(...)
//   if err != nil {
//      resp := admin.ToErrorResponse(err)
//   }
//   ...
func ToErrorResponse(err error) ErrorResponse {
	switch err := err.(type) {
	case ErrorResponse:
		return err
	default:
		return ErrorResponse{}
	}
}

// ErrInvalidArgument - Invalid argument response.
func ErrInvalidArgument(message string) error {
	return ErrorResponse{
		Code:      "InvalidArgument",
		Message:   message,
		RequestID: "minio",
	}
}