package xturbo

import "errors"

var (
	// ErrMalformed reports bytes from the server or a local file that do not
	// follow the wire format (truncated, impossible lengths).
	ErrMalformed = errors.New("xturbo: malformed data")
	// ErrSetupFailed is wrapped by SetupError when the server refuses the
	// connection.
	ErrSetupFailed = errors.New("xturbo: connection setup failed")
)

// Setup reply status bytes (xproto Setup*.status).
const (
	setupStatusFailed       = 0
	setupStatusSuccess      = 1
	setupStatusAuthenticate = 2
)

// SetupError is the server's refusal of the connection setup: Status 0
// (Failed) or 2 (Authenticate), with the server's reason. It wraps
// ErrSetupFailed.
type SetupError struct {
	Status uint8
	Reason string
}

func (e *SetupError) Error() string {
	kind := "failed"
	if e.Status == setupStatusAuthenticate {
		kind = "authenticate"
	}
	return "xturbo: connection setup " + kind + ": " + e.Reason
}

func (e *SetupError) Unwrap() error { return ErrSetupFailed }