package generic

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

type Error uint32

const (
	Ok                    Error = http.StatusOK
	ErrorNotImplemented   Error = http.StatusNotImplemented
	ErrorMethodNotAllowed Error = http.StatusMethodNotAllowed
	ErrorBadRequest       Error = http.StatusBadRequest
	ErrorUnauthorized     Error = http.StatusUnauthorized
	ErrorServerError      Error = http.StatusInternalServerError
)

func (e Error) Ok() (ok bool) {
	return e == Ok
}

func (e Error) HttpStatus() (code int) {
	return int(e)
}

func (e Error) String() (out string) {
	switch e {
	case Ok:
		out = "ok"
	case ErrorNotImplemented:
		out = "server not implemented"
	case ErrorMethodNotAllowed:
		out = "method not allowed"
	case ErrorBadRequest:
		out = "bad request"
	case ErrorUnauthorized:
		out = "user unauthorized"
	case ErrorServerError:
		out = "internal server error"
	default:
		out = "unhandled error"
	}
	return
}

func (e Error) Error() (out string) {
	return fmt.Sprintf("%s (%d)", e.String(), e.HttpStatus())
}

func (e Error) BodyBytes() (body []byte) {
	body, _ = json.Marshal(struct{ Error string }{Error: e.String()})
	return
}