package errhttp

import (
	"net/http"
)

var _ Error       = internalNotFound{}
var _ ClientError = internalNotFound{}
var _ NotFound    = internalNotFound{}

var ClientErrorNotFound ClientError = NotFoundWrap(nil).(NotFound)
var ErrHTTPNotFound     Error       = ClientErrorNotFound
var ErrNotFound         error       = ClientErrorNotFound

type NotFound  interface {
	ClientError
	NotFound ()
}

type internalNotFound struct {
	err error
}

func NotFoundWrap(err error) error {
	return internalNotFound {
		err:err,
	}
}

func (receiver internalNotFound) Error() string {
	err := receiver.err
	if nil == err {
		return http.StatusText(receiver.ErrHTTP())
	}
	return err.Error()
}

func (internalNotFound) ErrHTTP() int {
	return http.StatusNotFound
}

func (internalNotFound) ClientError() {
	// Nothing here.
}

func (internalNotFound) NotFound() {
	// Nothing here.
}

func (receiver internalNotFound) Unwrap() error {
	return receiver.err
}