package executor

import (
	"errors"
	"net/http"
)

// UpstreamWebsocketReplayRequiredError indicates that an incremental request
// cannot safely continue because its upstream websocket is no longer reusable.
type UpstreamWebsocketReplayRequiredError struct{}

func (*UpstreamWebsocketReplayRequiredError) Error() string {
	return `{"error":{"message":"upstream transport requires full HTTP replay","type":"server_error","code":"upstream_http_replay_required","status":426}}`
}

func (*UpstreamWebsocketReplayRequiredError) StatusCode() int { return http.StatusUpgradeRequired }

func (*UpstreamWebsocketReplayRequiredError) IsRequestScoped() bool { return true }

// NewUpstreamWebsocketReplayRequiredError creates a request-scoped replay signal.
func NewUpstreamWebsocketReplayRequiredError() error {
	return &UpstreamWebsocketReplayRequiredError{}
}

// IsUpstreamWebsocketReplayRequired reports whether err is the internal replay signal.
func IsUpstreamWebsocketReplayRequired(err error) bool {
	var replayErr *UpstreamWebsocketReplayRequiredError
	return errors.As(err, &replayErr)
}