//! The trait and type representations

use crate::experimental::trait_based::data::io::Inputs;

use super::data::io::Outputs;

pub(crate) trait PipelineElement {
    /// return a static runner function pointer to avoid dynamic dispatch during pipeline execution - Types MUST match the signature
    fn runner(&self) -> fn(&Inputs) -> Outputs;
    /// return the signature of the element
    fn signature(&self) -> ElementSignature;
}

/// Type signature for an element used for static checking
pub(crate) struct ElementSignature {
    pub inputs: Vec<DataType>,
    pub outputs: Vec<DataType>,
}

/// Data type enum
#[derive(Clone, Copy, PartialEq, Eq, Debug)]
pub enum DataType {
    String,
    Int,
}