CustomDurationWithSelect.kt

LaunchedEffect(currentMessage.value) {
    currentMessage.value?.let { message ->
        val result: SnackbarResult

        if (message.duration is SnackbarDurationWrapper.Custom) {
            // Create two competing operations
            val snackbarDeferred = async {
                snackbarHostState.showSnackbar(
                    message = message.text,
                    actionLabel = message.actionLabel,
                    duration = SnackbarDuration.Indefinite // Never auto-dismiss
                )
            }

            val timeoutDeferred = async {
                delay(message.duration.getMilliseconds())
                SnackbarResult.Dismissed // Timer won
            }

            // Race them - winner takes all
            result = select {
                snackbarDeferred.onAwait { userResult ->
                    timeoutDeferred.cancel() // Cancel timer
                    userResult
                }
                timeoutDeferred.onAwait { timerResult ->
                    snackbarHostState.currentSnackbarData?.dismiss()
                    snackbarDeferred.cancel() // Cancel snackbar
                    timerResult
                }
            }
        } else {
            // Use standard Material3 behavior
            result = snackbarHostState.showSnackbar(
                message = message.text,
                actionLabel = message.actionLabel,
                duration = message.duration.getStandardDuration()
            )
        }

        // Handle the result
        when (result) {
            SnackbarResult.ActionPerformed -> message.onAction?.invoke()
            SnackbarResult.Dismissed -> { /* Handle dismissal */ }
        }
    }
}