package xerrors

import (
	"errors"
	"google.golang.org/genproto/googleapis/rpc/errdetails"
	"google.golang.org/grpc/codes"
	"google.golang.org/grpc/status"
)

const (
	// UnknownCode is unknown code for error info.
	UnknownCode = 500
	// UnknownReason is unknown reason for error info.
	UnknownReason = ""
)

type Error struct {
	Status   int
	Message  string
	Reason   string
	Metadata map[string]string
}

func (e *Error) WithMetadata(data map[string]string) *Error {
	err := Clone(e)
	err.Metadata = data
	return err
}
func (s *Error) Error() string {
	return s.Message
}
func New(code int, reason, message string) *Error {
	return &Error{
		Status:   code,
		Message:  message,
		Reason:   reason,
		Metadata: map[string]string{},
	}
}
func (e *Error) GRPCStatus() *status.Status {
	s, _ := status.New(codes.Code(e.Status), e.Message).
		WithDetails(&errdetails.ErrorInfo{
			Reason:   e.Reason,
			Metadata: e.Metadata,
		})
	return s
}
func Clone(err *Error) *Error {
	if err == nil {
		return nil
	}
	metadata := make(map[string]string, len(err.Metadata))
	for k, v := range err.Metadata {
		metadata[k] = v
	}
	return &Error{
		Status:   err.Status,
		Reason:   err.Reason,
		Message:  err.Message,
		Metadata: metadata,
	}
}
func Code(err error) int {
	if err == nil {
		return 200
	}
	return FromError(err).Status
}

func FromError(err error) *Error {
	if err == nil {
		return nil
	}
	if se := new(Error); errors.As(err, &se) {
		return se
	}
	//gs, ok := status.FromError(err)
	//if !ok {
	return New(UnknownCode, UnknownReason, err.Error())
	//}
	//
}